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Fauntleroy/index.js

Last active July 21, 2017 18:30
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requirebin sketch
Raw
index.js
// Welcome! require() some modules from npm (like you were using browserify)
// and then hit Run Code to run your code on the right side.
// Modules get downloaded from browserify-cdn and bundled in your browser.
const decomp = require('poly-decomp');
window.decomp = decomp;
const Matter = require('matter-js');
const { PI } = Math;
// module aliases
const { Engine, Render, World, Bodies, Vertices } = Matter;
const { circle, rectangle } = Bodies;
// create an engine
const engine = Engine.create();
// create a renderer
const render = Render.create({
element: document.body,
engine: engine,
options: {
width: 400,
height: 800
}
});
// create two boxes and a ground
const pellet = circle(200, 0, 10);
const staticBox1 = rectangle(200, 350, 40, 40, { angle: (PI / 4), isStatic: true });
const staticBox2 = rectangle(300, 450, 40, 40, { angle: (PI / 4), isStatic: true });
const staticBox3 = rectangle(100, 450, 40, 40, { angle: (PI / 4), isStatic: true });
const leftWall = rectangle(-5, 400, 20, 800, { isStatic: true });
const rightWall = rectangle(405, 400, 20, 800, { isStatic: true });
const boundary1 = rectangle(100, 755, 5, 50, { isStatic: true });
const boundary2 = rectangle(175, 755, 5, 50, { isStatic: true });
const boundary3 = rectangle(225, 755, 5, 50, { isStatic: true });
const boundary4 = rectangle(300, 755, 5, 50, { isStatic: true });
const zone1 = rectangle(50, 790, 100, 20, { isStatic: true });
const zone2 = rectangle(137, 790, 75, 20, { isStatic: true });
const zone3 = rectangle(200, 790, 50, 20, { isStatic: true });
const zone4 = rectangle(262, 790, 75, 20, { isStatic: true });
const zone5 = rectangle(350, 790, 100, 20, { isStatic: true });
// add all of the bodies to the world
World.add(engine.world, [
pellet,
staticBox1, staticBox2, staticBox3,
leftWall, rightWall,
boundary1, boundary2, boundary3, boundary4,
zone1, zone2, zone3, zone4, zone5
]);
// run the engine
Engine.run(engine);
// run the renderer
Render.run(render);
Raw
minified.js
This file has been truncated, but you can view the full file.
setTimeout(function(){
;require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"poly-decomp":[function(require,module,exports){
module.exports = {
decomp: polygonDecomp,
quickDecomp: polygonQuickDecomp,
isSimple: polygonIsSimple,
removeCollinearPoints: polygonRemoveCollinearPoints,
makeCCW: polygonMakeCCW
};
/**
* Compute the intersection between two lines.
* @static
* @method lineInt
* @param {Array} l1 Line vector 1
* @param {Array} l2 Line vector 2
* @param {Number} precision Precision to use when checking if the lines are parallel
* @return {Array} The intersection point.
*/
function lineInt(l1,l2,precision){
precision = precision || 0;
var i = [0,0]; // point
var a1, b1, c1, a2, b2, c2, det; // scalars
a1 = l1[1][1] - l1[0][1];
b1 = l1[0][0] - l1[1][0];
c1 = a1 * l1[0][0] + b1 * l1[0][1];
a2 = l2[1][1] - l2[0][1];
b2 = l2[0][0] - l2[1][0];
c2 = a2 * l2[0][0] + b2 * l2[0][1];
det = a1 * b2 - a2*b1;
if (!scalar_eq(det, 0, precision)) { // lines are not parallel
i[0] = (b2 * c1 - b1 * c2) / det;
i[1] = (a1 * c2 - a2 * c1) / det;
}
return i;
}
/**
* Checks if two line segments intersects.
* @method segmentsIntersect
* @param {Array} p1 The start vertex of the first line segment.
* @param {Array} p2 The end vertex of the first line segment.
* @param {Array} q1 The start vertex of the second line segment.
* @param {Array} q2 The end vertex of the second line segment.
* @return {Boolean} True if the two line segments intersect
*/
function lineSegmentsIntersect(p1, p2, q1, q2){
var dx = p2[0] - p1[0];
var dy = p2[1] - p1[1];
var da = q2[0] - q1[0];
var db = q2[1] - q1[1];
// segments are parallel
if((da*dy - db*dx) === 0){
return false;
}
var s = (dx * (q1[1] - p1[1]) + dy * (p1[0] - q1[0])) / (da * dy - db * dx);
var t = (da * (p1[1] - q1[1]) + db * (q1[0] - p1[0])) / (db * dx - da * dy);
return (s>=0 && s<=1 && t>=0 && t<=1);
}
/**
* Get the area of a triangle spanned by the three given points. Note that the area will be negative if the points are not given in counter-clockwise order.
* @static
* @method area
* @param {Array} a
* @param {Array} b
* @param {Array} c
* @return {Number}
*/
function triangleArea(a,b,c){
return (((b[0] - a[0])*(c[1] - a[1]))-((c[0] - a[0])*(b[1] - a[1])));
}
function isLeft(a,b,c){
return triangleArea(a,b,c) > 0;
}
function isLeftOn(a,b,c) {
return triangleArea(a, b, c) >= 0;
}
function isRight(a,b,c) {
return triangleArea(a, b, c) < 0;
}
function isRightOn(a,b,c) {
return triangleArea(a, b, c) <= 0;
}
var tmpPoint1 = [],
tmpPoint2 = [];
/**
* Check if three points are collinear
* @method collinear
* @param {Array} a
* @param {Array} b
* @param {Array} c
* @param {Number} [thresholdAngle=0] Threshold angle to use when comparing the vectors. The function will return true if the angle between the resulting vectors is less than this value. Use zero for max precision.
* @return {Boolean}
*/
function collinear(a,b,c,thresholdAngle) {
if(!thresholdAngle){
return triangleArea(a, b, c) === 0;
} else {
var ab = tmpPoint1,
bc = tmpPoint2;
ab[0] = b[0]-a[0];
ab[1] = b[1]-a[1];
bc[0] = c[0]-b[0];
bc[1] = c[1]-b[1];
var dot = ab[0]*bc[0] + ab[1]*bc[1],
magA = Math.sqrt(ab[0]*ab[0] + ab[1]*ab[1]),
magB = Math.sqrt(bc[0]*bc[0] + bc[1]*bc[1]),
angle = Math.acos(dot/(magA*magB));
return angle < thresholdAngle;
}
}
function sqdist(a,b){
var dx = b[0] - a[0];
var dy = b[1] - a[1];
return dx * dx + dy * dy;
}
/**
* Get a vertex at position i. It does not matter if i is out of bounds, this function will just cycle.
* @method at
* @param {Number} i
* @return {Array}
*/
function polygonAt(polygon, i){
var s = polygon.length;
return polygon[i < 0 ? i % s + s : i % s];
}
/**
* Clear the polygon data
* @method clear
* @return {Array}
*/
function polygonClear(polygon){
polygon.length = 0;
}
/**
* Append points "from" to "to"-1 from an other polygon "poly" onto this one.
* @method append
* @param {Polygon} poly The polygon to get points from.
* @param {Number} from The vertex index in "poly".
* @param {Number} to The end vertex index in "poly". Note that this vertex is NOT included when appending.
* @return {Array}
*/
function polygonAppend(polygon, poly, from, to){
for(var i=from; i<to; i++){
polygon.push(poly[i]);
}
}
/**
* Make sure that the polygon vertices are ordered counter-clockwise.
* @method makeCCW
*/
function polygonMakeCCW(polygon){
var br = 0,
v = polygon;
// find bottom right point
for (var i = 1; i < polygon.length; ++i) {
if (v[i][1] < v[br][1] || (v[i][1] === v[br][1] && v[i][0] > v[br][0])) {
br = i;
}
}
// reverse poly if clockwise
if (!isLeft(polygonAt(polygon, br - 1), polygonAt(polygon, br), polygonAt(polygon, br + 1))) {
polygonReverse(polygon);
}
}
/**
* Reverse the vertices in the polygon
* @method reverse
*/
function polygonReverse(polygon){
var tmp = [];
var N = polygon.length;
for(var i=0; i!==N; i++){
tmp.push(polygon.pop());
}
for(var i=0; i!==N; i++){
polygon[i] = tmp[i];
}
}
/**
* Check if a point in the polygon is a reflex point
* @method isReflex
* @param {Number} i
* @return {Boolean}
*/
function polygonIsReflex(polygon, i){
return isRight(polygonAt(polygon, i - 1), polygonAt(polygon, i), polygonAt(polygon, i + 1));
}
var tmpLine1=[],
tmpLine2=[];
/**
* Check if two vertices in the polygon can see each other
* @method canSee
* @param {Number} a Vertex index 1
* @param {Number} b Vertex index 2
* @return {Boolean}
*/
function polygonCanSee(polygon, a,b) {
var p, dist, l1=tmpLine1, l2=tmpLine2;
if (isLeftOn(polygonAt(polygon, a + 1), polygonAt(polygon, a), polygonAt(polygon, b)) && isRightOn(polygonAt(polygon, a - 1), polygonAt(polygon, a), polygonAt(polygon, b))) {
return false;
}
dist = sqdist(polygonAt(polygon, a), polygonAt(polygon, b));
for (var i = 0; i !== polygon.length; ++i) { // for each edge
if ((i + 1) % polygon.length === a || i === a){ // ignore incident edges
continue;
}
if (isLeftOn(polygonAt(polygon, a), polygonAt(polygon, b), polygonAt(polygon, i + 1)) && isRightOn(polygonAt(polygon, a), polygonAt(polygon, b), polygonAt(polygon, i))) { // if diag intersects an edge
l1[0] = polygonAt(polygon, a);
l1[1] = polygonAt(polygon, b);
l2[0] = polygonAt(polygon, i);
l2[1] = polygonAt(polygon, i + 1);
p = lineInt(l1,l2);
if (sqdist(polygonAt(polygon, a), p) < dist) { // if edge is blocking visibility to b
return false;
}
}
}
return true;
}
/**
* Copy the polygon from vertex i to vertex j.
* @method copy
* @param {Number} i
* @param {Number} j
* @param {Polygon} [targetPoly] Optional target polygon to save in.
* @return {Polygon} The resulting copy.
*/
function polygonCopy(polygon, i,j,targetPoly){
var p = targetPoly || [];
polygonClear(p);
if (i < j) {
// Insert all vertices from i to j
for(var k=i; k<=j; k++){
p.push(polygon[k]);
}
} else {
// Insert vertices 0 to j
for(var k=0; k<=j; k++){
p.push(polygon[k]);
}
// Insert vertices i to end
for(var k=i; k<polygon.length; k++){
p.push(polygon[k]);
}
}
return p;
}
/**
* Decomposes the polygon into convex pieces. Returns a list of edges [[p1,p2],[p2,p3],...] that cuts the polygon.
* Note that this algorithm has complexity O(N^4) and will be very slow for polygons with many vertices.
* @method getCutEdges
* @return {Array}
*/
function polygonGetCutEdges(polygon) {
var min=[], tmp1=[], tmp2=[], tmpPoly = [];
var nDiags = Number.MAX_VALUE;
for (var i = 0; i < polygon.length; ++i) {
if (polygonIsReflex(polygon, i)) {
for (var j = 0; j < polygon.length; ++j) {
if (polygonCanSee(polygon, i, j)) {
tmp1 = polygonGetCutEdges(polygonCopy(polygon, i, j, tmpPoly));
tmp2 = polygonGetCutEdges(polygonCopy(polygon, j, i, tmpPoly));
for(var k=0; k<tmp2.length; k++){
tmp1.push(tmp2[k]);
}
if (tmp1.length < nDiags) {
min = tmp1;
nDiags = tmp1.length;
min.push([polygonAt(polygon, i), polygonAt(polygon, j)]);
}
}
}
}
}
return min;
}
/**
* Decomposes the polygon into one or more convex sub-Polygons.
* @method decomp
* @return {Array} An array or Polygon objects.
*/
function polygonDecomp(polygon){
var edges = polygonGetCutEdges(polygon);
if(edges.length > 0){
return polygonSlice(polygon, edges);
} else {
return [polygon];
}
}
/**
* Slices the polygon given one or more cut edges. If given one, this function will return two polygons (false on failure). If many, an array of polygons.
* @method slice
* @param {Array} cutEdges A list of edges, as returned by .getCutEdges()
* @return {Array}
*/
function polygonSlice(polygon, cutEdges){
if(cutEdges.length === 0){
return [polygon];
}
if(cutEdges instanceof Array && cutEdges.length && cutEdges[0] instanceof Array && cutEdges[0].length===2 && cutEdges[0][0] instanceof Array){
var polys = [polygon];
for(var i=0; i<cutEdges.length; i++){
var cutEdge = cutEdges[i];
// Cut all polys
for(var j=0; j<polys.length; j++){
var poly = polys[j];
var result = polygonSlice(poly, cutEdge);
if(result){
// Found poly! Cut and quit
polys.splice(j,1);
polys.push(result[0],result[1]);
break;
}
}
}
return polys;
} else {
// Was given one edge
var cutEdge = cutEdges;
var i = polygon.indexOf(cutEdge[0]);
var j = polygon.indexOf(cutEdge[1]);
if(i !== -1 && j !== -1){
return [polygonCopy(polygon, i,j),
polygonCopy(polygon, j,i)];
} else {
return false;
}
}
}
/**
* Checks that the line segments of this polygon do not intersect each other.
* @method isSimple
* @param {Array} path An array of vertices e.g. [[0,0],[0,1],...]
* @return {Boolean}
* @todo Should it check all segments with all others?
*/
function polygonIsSimple(polygon){
var path = polygon, i;
// Check
for(i=0; i<path.length-1; i++){
for(var j=0; j<i-1; j++){
if(lineSegmentsIntersect(path[i], path[i+1], path[j], path[j+1] )){
return false;
}
}
}
// Check the segment between the last and the first point to all others
for(i=1; i<path.length-2; i++){
if(lineSegmentsIntersect(path[0], path[path.length-1], path[i], path[i+1] )){
return false;
}
}
return true;
}
function getIntersectionPoint(p1, p2, q1, q2, delta){
delta = delta || 0;
var a1 = p2[1] - p1[1];
var b1 = p1[0] - p2[0];
var c1 = (a1 * p1[0]) + (b1 * p1[1]);
var a2 = q2[1] - q1[1];
var b2 = q1[0] - q2[0];
var c2 = (a2 * q1[0]) + (b2 * q1[1]);
var det = (a1 * b2) - (a2 * b1);
if(!scalar_eq(det,0,delta)){
return [((b2 * c1) - (b1 * c2)) / det, ((a1 * c2) - (a2 * c1)) / det];
} else {
return [0,0];
}
}
/**
* Quickly decompose the Polygon into convex sub-polygons.
* @method quickDecomp
* @param {Array} result
* @param {Array} [reflexVertices]
* @param {Array} [steinerPoints]
* @param {Number} [delta]
* @param {Number} [maxlevel]
* @param {Number} [level]
* @return {Array}
*/
function polygonQuickDecomp(polygon, result,reflexVertices,steinerPoints,delta,maxlevel,level){
maxlevel = maxlevel || 100;
level = level || 0;
delta = delta || 25;
result = typeof(result)!=="undefined" ? result : [];
reflexVertices = reflexVertices || [];
steinerPoints = steinerPoints || [];
var upperInt=[0,0], lowerInt=[0,0], p=[0,0]; // Points
var upperDist=0, lowerDist=0, d=0, closestDist=0; // scalars
var upperIndex=0, lowerIndex=0, closestIndex=0; // Integers
var lowerPoly=[], upperPoly=[]; // polygons
var poly = polygon,
v = polygon;
if(v.length < 3){
return result;
}
level++;
if(level > maxlevel){
console.warn("quickDecomp: max level ("+maxlevel+") reached.");
return result;
}
for (var i = 0; i < polygon.length; ++i) {
if (polygonIsReflex(poly, i)) {
reflexVertices.push(poly[i]);
upperDist = lowerDist = Number.MAX_VALUE;
for (var j = 0; j < polygon.length; ++j) {
if (isLeft(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j)) && isRightOn(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j - 1))) { // if line intersects with an edge
p = getIntersectionPoint(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j), polygonAt(poly, j - 1)); // find the point of intersection
if (isRight(polygonAt(poly, i + 1), polygonAt(poly, i), p)) { // make sure it's inside the poly
d = sqdist(poly[i], p);
if (d < lowerDist) { // keep only the closest intersection
lowerDist = d;
lowerInt = p;
lowerIndex = j;
}
}
}
if (isLeft(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j + 1)) && isRightOn(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j))) {
p = getIntersectionPoint(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j), polygonAt(poly, j + 1));
if (isLeft(polygonAt(poly, i - 1), polygonAt(poly, i), p)) {
d = sqdist(poly[i], p);
if (d < upperDist) {
upperDist = d;
upperInt = p;
upperIndex = j;
}
}
}
}
// if there are no vertices to connect to, choose a point in the middle
if (lowerIndex === (upperIndex + 1) % polygon.length) {
//console.log("Case 1: Vertex("+i+"), lowerIndex("+lowerIndex+"), upperIndex("+upperIndex+"), poly.size("+polygon.length+")");
p[0] = (lowerInt[0] + upperInt[0]) / 2;
p[1] = (lowerInt[1] + upperInt[1]) / 2;
steinerPoints.push(p);
if (i < upperIndex) {
//lowerPoly.insert(lowerPoly.end(), poly.begin() + i, poly.begin() + upperIndex + 1);
polygonAppend(lowerPoly, poly, i, upperIndex+1);
lowerPoly.push(p);
upperPoly.push(p);
if (lowerIndex !== 0){
//upperPoly.insert(upperPoly.end(), poly.begin() + lowerIndex, poly.end());
polygonAppend(upperPoly, poly,lowerIndex,poly.length);
}
//upperPoly.insert(upperPoly.end(), poly.begin(), poly.begin() + i + 1);
polygonAppend(upperPoly, poly,0,i+1);
} else {
if (i !== 0){
//lowerPoly.insert(lowerPoly.end(), poly.begin() + i, poly.end());
polygonAppend(lowerPoly, poly,i,poly.length);
}
//lowerPoly.insert(lowerPoly.end(), poly.begin(), poly.begin() + upperIndex + 1);
polygonAppend(lowerPoly, poly,0,upperIndex+1);
lowerPoly.push(p);
upperPoly.push(p);
//upperPoly.insert(upperPoly.end(), poly.begin() + lowerIndex, poly.begin() + i + 1);
polygonAppend(upperPoly, poly,lowerIndex,i+1);
}
} else {
// connect to the closest point within the triangle
//console.log("Case 2: Vertex("+i+"), closestIndex("+closestIndex+"), poly.size("+polygon.length+")\n");
if (lowerIndex > upperIndex) {
upperIndex += polygon.length;
}
closestDist = Number.MAX_VALUE;
if(upperIndex < lowerIndex){
return result;
}
for (var j = lowerIndex; j <= upperIndex; ++j) {
if (isLeftOn(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j)) && isRightOn(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j))) {
d = sqdist(polygonAt(poly, i), polygonAt(poly, j));
if (d < closestDist) {
closestDist = d;
closestIndex = j % polygon.length;
}
}
}
if (i < closestIndex) {
polygonAppend(lowerPoly, poly,i,closestIndex+1);
if (closestIndex !== 0){
polygonAppend(upperPoly, poly,closestIndex,v.length);
}
polygonAppend(upperPoly, poly,0,i+1);
} else {
if (i !== 0){
polygonAppend(lowerPoly, poly,i,v.length);
}
polygonAppend(lowerPoly, poly,0,closestIndex+1);
polygonAppend(upperPoly, poly,closestIndex,i+1);
}
}
// solve smallest poly first
if (lowerPoly.length < upperPoly.length) {
polygonQuickDecomp(lowerPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);
polygonQuickDecomp(upperPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);
} else {
polygonQuickDecomp(upperPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);
polygonQuickDecomp(lowerPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);
}
return result;
}
}
result.push(polygon);
return result;
}
/**
* Remove collinear points in the polygon.
* @method removeCollinearPoints
* @param {Number} [precision] The threshold angle to use when determining whether two edges are collinear. Use zero for finest precision.
* @return {Number} The number of points removed
*/
function polygonRemoveCollinearPoints(polygon, precision){
var num = 0;
for(var i=polygon.length-1; polygon.length>3 && i>=0; --i){
if(collinear(polygonAt(polygon, i-1),polygonAt(polygon, i),polygonAt(polygon, i+1),precision)){
// Remove the middle point
polygon.splice(i%polygon.length,1);
num++;
}
}
return num;
}
/**
* Check if two scalars are equal
* @static
* @method eq
* @param {Number} a
* @param {Number} b
* @param {Number} [precision]
* @return {Boolean}
*/
function scalar_eq(a,b,precision){
precision = precision || 0;
return Math.abs(a-b) < precision;
}
},{}]},{},[])
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// point\n    var a1, b1, c1, a2, b2, c2, det; // scalars\n    a1 = l1[1][1] - l1[0][1];\n    b1 = l1[0][0] - l1[1][0];\n    c1 = a1 * l1[0][0] + b1 * l1[0][1];\n    a2 = l2[1][1] - l2[0][1];\n    b2 = l2[0][0] - l2[1][0];\n    c2 = a2 * l2[0][0] + b2 * l2[0][1];\n    det = a1 * b2 - a2*b1;\n    if (!scalar_eq(det, 0, precision)) { // lines are not parallel\n        i[0] = (b2 * c1 - b1 * c2) / det;\n        i[1] = (a1 * c2 - a2 * c1) / det;\n    }\n    return i;\n}\n\n/**\n * Checks if two line segments intersects.\n * @method segmentsIntersect\n * @param {Array} p1 The start vertex of the first line segment.\n * @param {Array} p2 The end vertex of the first line segment.\n * @param {Array} q1 The start vertex of the second line segment.\n * @param {Array} q2 The end vertex of the second line segment.\n * @return {Boolean} True if the two line segments intersect\n */\nfunction lineSegmentsIntersect(p1, p2, q1, q2){\n\tvar dx = p2[0] - p1[0];\n\tvar dy = p2[1] - p1[1];\n\tvar da = q2[0] - q1[0];\n\tvar db = q2[1] - q1[1];\n\n\t// segments are parallel\n\tif((da*dy - db*dx) === 0){\n\t\treturn false;\n\t}\n\n\tvar s = (dx * (q1[1] - p1[1]) + dy * (p1[0] - q1[0])) / (da * dy - db * dx);\n\tvar t = (da * (p1[1] - q1[1]) + db * (q1[0] - p1[0])) / (db * dx - da * dy);\n\n\treturn (s>=0 && s<=1 && t>=0 && t<=1);\n}\n\n/**\n * Get the area of a triangle spanned by the three given points. Note that the area will be negative if the points are not given in counter-clockwise order.\n * @static\n * @method area\n * @param  {Array} a\n * @param  {Array} b\n * @param  {Array} c\n * @return {Number}\n */\nfunction triangleArea(a,b,c){\n    return (((b[0] - a[0])*(c[1] - a[1]))-((c[0] - a[0])*(b[1] - a[1])));\n}\n\nfunction isLeft(a,b,c){\n    return triangleArea(a,b,c) > 0;\n}\n\nfunction isLeftOn(a,b,c) {\n    return triangleArea(a, b, c) >= 0;\n}\n\nfunction isRight(a,b,c) {\n    return triangleArea(a, b, c) < 0;\n}\n\nfunction isRightOn(a,b,c) {\n    return triangleArea(a, b, c) <= 0;\n}\n\nvar tmpPoint1 = [],\n    tmpPoint2 = [];\n\n/**\n * Check if three points are collinear\n * @method collinear\n * @param  {Array} a\n * @param  {Array} b\n * @param  {Array} c\n * @param  {Number} [thresholdAngle=0] Threshold angle to use when comparing the vectors. The function will return true if the angle between the resulting vectors is less than this value. Use zero for max precision.\n * @return {Boolean}\n */\nfunction collinear(a,b,c,thresholdAngle) {\n    if(!thresholdAngle){\n        return triangleArea(a, b, c) === 0;\n    } else {\n        var ab = tmpPoint1,\n            bc = tmpPoint2;\n\n        ab[0] = b[0]-a[0];\n        ab[1] = b[1]-a[1];\n        bc[0] = c[0]-b[0];\n        bc[1] = c[1]-b[1];\n\n        var dot = ab[0]*bc[0] + ab[1]*bc[1],\n            magA = Math.sqrt(ab[0]*ab[0] + ab[1]*ab[1]),\n            magB = Math.sqrt(bc[0]*bc[0] + bc[1]*bc[1]),\n            angle = Math.acos(dot/(magA*magB));\n        return angle < thresholdAngle;\n    }\n}\n\nfunction sqdist(a,b){\n    var dx = b[0] - a[0];\n    var dy = b[1] - a[1];\n    return dx * dx + dy * dy;\n}\n\n/**\n * Get a vertex at position i. It does not matter if i is out of bounds, this function will just cycle.\n * @method at\n * @param  {Number} i\n * @return {Array}\n */\nfunction polygonAt(polygon, i){\n    var s = polygon.length;\n    return polygon[i < 0 ? i % s + s : i % s];\n}\n\n/**\n * Clear the polygon data\n * @method clear\n * @return {Array}\n */\nfunction polygonClear(polygon){\n    polygon.length = 0;\n}\n\n/**\n * Append points \"from\" to \"to\"-1 from an other polygon \"poly\" onto this one.\n * @method append\n * @param {Polygon} poly The polygon to get points from.\n * @param {Number}  from The vertex index in \"poly\".\n * @param {Number}  to The end vertex index in \"poly\". Note that this vertex is NOT included when appending.\n * @return {Array}\n */\nfunction polygonAppend(polygon, poly, from, to){\n    for(var i=from; i<to; i++){\n        polygon.push(poly[i]);\n    }\n}\n\n/**\n * Make sure that the polygon vertices are ordered counter-clockwise.\n * @method makeCCW\n */\nfunction polygonMakeCCW(polygon){\n    var br = 0,\n        v = polygon;\n\n    // find bottom right point\n    for (var i = 1; i < polygon.length; ++i) {\n        if (v[i][1] < v[br][1] || (v[i][1] === v[br][1] && v[i][0] > v[br][0])) {\n            br = i;\n        }\n    }\n\n    // reverse poly if clockwise\n    if (!isLeft(polygonAt(polygon, br - 1), polygonAt(polygon, br), polygonAt(polygon, br + 1))) {\n        polygonReverse(polygon);\n    }\n}\n\n/**\n * Reverse the vertices in the polygon\n * @method reverse\n */\nfunction polygonReverse(polygon){\n    var tmp = [];\n    var N = polygon.length;\n    for(var i=0; i!==N; i++){\n        tmp.push(polygon.pop());\n    }\n    for(var i=0; i!==N; i++){\n\t\tpolygon[i] = tmp[i];\n    }\n}\n\n/**\n * Check if a point in the polygon is a reflex point\n * @method isReflex\n * @param  {Number}  i\n * @return {Boolean}\n */\nfunction polygonIsReflex(polygon, i){\n    return isRight(polygonAt(polygon, i - 1), polygonAt(polygon, i), polygonAt(polygon, i + 1));\n}\n\nvar tmpLine1=[],\n    tmpLine2=[];\n\n/**\n * Check if two vertices in the polygon can see each other\n * @method canSee\n * @param  {Number} a Vertex index 1\n * @param  {Number} b Vertex index 2\n * @return {Boolean}\n */\nfunction polygonCanSee(polygon, a,b) {\n    var p, dist, l1=tmpLine1, l2=tmpLine2;\n\n    if (isLeftOn(polygonAt(polygon, a + 1), polygonAt(polygon, a), polygonAt(polygon, b)) && isRightOn(polygonAt(polygon, a - 1), polygonAt(polygon, a), polygonAt(polygon, b))) {\n        return false;\n    }\n    dist = sqdist(polygonAt(polygon, a), polygonAt(polygon, b));\n    for (var i = 0; i !== polygon.length; ++i) { // for each edge\n        if ((i + 1) % polygon.length === a || i === a){ // ignore incident edges\n            continue;\n        }\n        if (isLeftOn(polygonAt(polygon, a), polygonAt(polygon, b), polygonAt(polygon, i + 1)) && isRightOn(polygonAt(polygon, a), polygonAt(polygon, b), polygonAt(polygon, i))) { // if diag intersects an edge\n            l1[0] = polygonAt(polygon, a);\n            l1[1] = polygonAt(polygon, b);\n            l2[0] = polygonAt(polygon, i);\n            l2[1] = polygonAt(polygon, i + 1);\n            p = lineInt(l1,l2);\n            if (sqdist(polygonAt(polygon, a), p) < dist) { // if edge is blocking visibility to b\n                return false;\n            }\n        }\n    }\n\n    return true;\n}\n\n/**\n * Copy the polygon from vertex i to vertex j.\n * @method copy\n * @param  {Number} i\n * @param  {Number} j\n * @param  {Polygon} [targetPoly]   Optional target polygon to save in.\n * @return {Polygon}                The resulting copy.\n */\nfunction polygonCopy(polygon, i,j,targetPoly){\n    var p = targetPoly || [];\n    polygonClear(p);\n    if (i < j) {\n        // Insert all vertices from i to j\n        for(var k=i; k<=j; k++){\n            p.push(polygon[k]);\n        }\n\n    } else {\n\n        // Insert vertices 0 to j\n        for(var k=0; k<=j; k++){\n            p.push(polygon[k]);\n        }\n\n        // Insert vertices i to end\n        for(var k=i; k<polygon.length; k++){\n            p.push(polygon[k]);\n        }\n    }\n\n    return p;\n}\n\n/**\n * Decomposes the polygon into convex pieces. Returns a list of edges [[p1,p2],[p2,p3],...] that cuts the polygon.\n * Note that this algorithm has complexity O(N^4) and will be very slow for polygons with many vertices.\n * @method getCutEdges\n * @return {Array}\n */\nfunction polygonGetCutEdges(polygon) {\n    var min=[], tmp1=[], tmp2=[], tmpPoly = [];\n    var nDiags = Number.MAX_VALUE;\n\n    for (var i = 0; i < polygon.length; ++i) {\n        if (polygonIsReflex(polygon, i)) {\n            for (var j = 0; j < polygon.length; ++j) {\n                if (polygonCanSee(polygon, i, j)) {\n                    tmp1 = polygonGetCutEdges(polygonCopy(polygon, i, j, tmpPoly));\n                    tmp2 = polygonGetCutEdges(polygonCopy(polygon, j, i, tmpPoly));\n\n                    for(var k=0; k<tmp2.length; k++){\n                        tmp1.push(tmp2[k]);\n                    }\n\n                    if (tmp1.length < nDiags) {\n                        min = tmp1;\n                        nDiags = tmp1.length;\n                        min.push([polygonAt(polygon, i), polygonAt(polygon, j)]);\n                    }\n                }\n            }\n        }\n    }\n\n    return min;\n}\n\n/**\n * Decomposes the polygon into one or more convex sub-Polygons.\n * @method decomp\n * @return {Array} An array or Polygon objects.\n */\nfunction polygonDecomp(polygon){\n    var edges = polygonGetCutEdges(polygon);\n    if(edges.length > 0){\n        return polygonSlice(polygon, edges);\n    } else {\n        return [polygon];\n    }\n}\n\n/**\n * Slices the polygon given one or more cut edges. If given one, this function will return two polygons (false on failure). If many, an array of polygons.\n * @method slice\n * @param {Array} cutEdges A list of edges, as returned by .getCutEdges()\n * @return {Array}\n */\nfunction polygonSlice(polygon, cutEdges){\n    if(cutEdges.length === 0){\n\t\treturn [polygon];\n    }\n    if(cutEdges instanceof Array && cutEdges.length && cutEdges[0] instanceof Array && cutEdges[0].length===2 && cutEdges[0][0] instanceof Array){\n\n        var polys = [polygon];\n\n        for(var i=0; i<cutEdges.length; i++){\n            var cutEdge = cutEdges[i];\n            // Cut all polys\n            for(var j=0; j<polys.length; j++){\n                var poly = polys[j];\n                var result = polygonSlice(poly, cutEdge);\n                if(result){\n                    // Found poly! Cut and quit\n                    polys.splice(j,1);\n                    polys.push(result[0],result[1]);\n                    break;\n                }\n            }\n        }\n\n        return polys;\n    } else {\n\n        // Was given one edge\n        var cutEdge = cutEdges;\n        var i = polygon.indexOf(cutEdge[0]);\n        var j = polygon.indexOf(cutEdge[1]);\n\n        if(i !== -1 && j !== -1){\n            return [polygonCopy(polygon, i,j),\n                    polygonCopy(polygon, j,i)];\n        } else {\n            return false;\n        }\n    }\n}\n\n/**\n * Checks that the line segments of this polygon do not intersect each other.\n * @method isSimple\n * @param  {Array} path An array of vertices e.g. [[0,0],[0,1],...]\n * @return {Boolean}\n * @todo Should it check all segments with all others?\n */\nfunction polygonIsSimple(polygon){\n    var path = polygon, i;\n    // Check\n    for(i=0; i<path.length-1; i++){\n        for(var j=0; j<i-1; j++){\n            if(lineSegmentsIntersect(path[i], path[i+1], path[j], path[j+1] )){\n                return false;\n            }\n        }\n    }\n\n    // Check the segment between the last and the first point to all others\n    for(i=1; i<path.length-2; i++){\n        if(lineSegmentsIntersect(path[0], path[path.length-1], path[i], path[i+1] )){\n            return false;\n        }\n    }\n\n    return true;\n}\n\nfunction getIntersectionPoint(p1, p2, q1, q2, delta){\n\tdelta = delta || 0;\n\tvar a1 = p2[1] - p1[1];\n\tvar b1 = p1[0] - p2[0];\n\tvar c1 = (a1 * p1[0]) + (b1 * p1[1]);\n\tvar a2 = q2[1] - q1[1];\n\tvar b2 = q1[0] - q2[0];\n\tvar c2 = (a2 * q1[0]) + (b2 * q1[1]);\n\tvar det = (a1 * b2) - (a2 * b1);\n\n\tif(!scalar_eq(det,0,delta)){\n\t\treturn [((b2 * c1) - (b1 * c2)) / det, ((a1 * c2) - (a2 * c1)) / det];\n\t} else {\n\t\treturn [0,0];\n    }\n}\n\n/**\n * Quickly decompose the Polygon into convex sub-polygons.\n * @method quickDecomp\n * @param  {Array} result\n * @param  {Array} [reflexVertices]\n * @param  {Array} [steinerPoints]\n * @param  {Number} [delta]\n * @param  {Number} [maxlevel]\n * @param  {Number} [level]\n * @return {Array}\n */\nfunction polygonQuickDecomp(polygon, result,reflexVertices,steinerPoints,delta,maxlevel,level){\n    maxlevel = maxlevel || 100;\n    level = level || 0;\n    delta = delta || 25;\n    result = typeof(result)!==\"undefined\" ? result : [];\n    reflexVertices = reflexVertices || [];\n    steinerPoints = steinerPoints || [];\n\n    var upperInt=[0,0], lowerInt=[0,0], p=[0,0]; // Points\n    var upperDist=0, lowerDist=0, d=0, closestDist=0; // scalars\n    var upperIndex=0, lowerIndex=0, closestIndex=0; // Integers\n    var lowerPoly=[], upperPoly=[]; // polygons\n    var poly = polygon,\n        v = polygon;\n\n    if(v.length < 3){\n\t\treturn result;\n    }\n\n    level++;\n    if(level > maxlevel){\n        console.warn(\"quickDecomp: max level (\"+maxlevel+\") reached.\");\n        return result;\n    }\n\n    for (var i = 0; i < polygon.length; ++i) {\n        if (polygonIsReflex(poly, i)) {\n            reflexVertices.push(poly[i]);\n            upperDist = lowerDist = Number.MAX_VALUE;\n\n\n            for (var j = 0; j < polygon.length; ++j) {\n                if (isLeft(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j)) && isRightOn(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j - 1))) { // if line intersects with an edge\n                    p = getIntersectionPoint(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j), polygonAt(poly, j - 1)); // find the point of intersection\n                    if (isRight(polygonAt(poly, i + 1), polygonAt(poly, i), p)) { // make sure it's inside the poly\n                        d = sqdist(poly[i], p);\n                        if (d < lowerDist) { // keep only the closest intersection\n                            lowerDist = d;\n                            lowerInt = p;\n                            lowerIndex = j;\n                        }\n                    }\n                }\n                if (isLeft(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j + 1)) && isRightOn(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j))) {\n                    p = getIntersectionPoint(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j), polygonAt(poly, j + 1));\n                    if (isLeft(polygonAt(poly, i - 1), polygonAt(poly, i), p)) {\n                        d = sqdist(poly[i], p);\n                        if (d < upperDist) {\n                            upperDist = d;\n                            upperInt = p;\n                            upperIndex = j;\n                        }\n                    }\n                }\n            }\n\n            // if there are no vertices to connect to, choose a point in the middle\n            if (lowerIndex === (upperIndex + 1) % polygon.length) {\n                //console.log(\"Case 1: Vertex(\"+i+\"), lowerIndex(\"+lowerIndex+\"), upperIndex(\"+upperIndex+\"), poly.size(\"+polygon.length+\")\");\n                p[0] = (lowerInt[0] + upperInt[0]) / 2;\n                p[1] = (lowerInt[1] + upperInt[1]) / 2;\n                steinerPoints.push(p);\n\n                if (i < upperIndex) {\n                    //lowerPoly.insert(lowerPoly.end(), poly.begin() + i, poly.begin() + upperIndex + 1);\n                    polygonAppend(lowerPoly, poly, i, upperIndex+1);\n                    lowerPoly.push(p);\n                    upperPoly.push(p);\n                    if (lowerIndex !== 0){\n                        //upperPoly.insert(upperPoly.end(), poly.begin() + lowerIndex, poly.end());\n                        polygonAppend(upperPoly, poly,lowerIndex,poly.length);\n                    }\n                    //upperPoly.insert(upperPoly.end(), poly.begin(), poly.begin() + i + 1);\n                    polygonAppend(upperPoly, poly,0,i+1);\n                } else {\n                    if (i !== 0){\n                        //lowerPoly.insert(lowerPoly.end(), poly.begin() + i, poly.end());\n                        polygonAppend(lowerPoly, poly,i,poly.length);\n                    }\n                    //lowerPoly.insert(lowerPoly.end(), poly.begin(), poly.begin() + upperIndex + 1);\n                    polygonAppend(lowerPoly, poly,0,upperIndex+1);\n                    lowerPoly.push(p);\n                    upperPoly.push(p);\n                    //upperPoly.insert(upperPoly.end(), poly.begin() + lowerIndex, poly.begin() + i + 1);\n                    polygonAppend(upperPoly, poly,lowerIndex,i+1);\n                }\n            } else {\n                // connect to the closest point within the triangle\n                //console.log(\"Case 2: Vertex(\"+i+\"), closestIndex(\"+closestIndex+\"), poly.size(\"+polygon.length+\")\\n\");\n\n                if (lowerIndex > upperIndex) {\n                    upperIndex += polygon.length;\n                }\n                closestDist = Number.MAX_VALUE;\n\n                if(upperIndex < lowerIndex){\n                    return result;\n                }\n\n                for (var j = lowerIndex; j <= upperIndex; ++j) {\n                    if (isLeftOn(polygonAt(poly, i - 1), polygonAt(poly, i), polygonAt(poly, j)) && isRightOn(polygonAt(poly, i + 1), polygonAt(poly, i), polygonAt(poly, j))) {\n                        d = sqdist(polygonAt(poly, i), polygonAt(poly, j));\n                        if (d < closestDist) {\n                            closestDist = d;\n                            closestIndex = j % polygon.length;\n                        }\n                    }\n                }\n\n                if (i < closestIndex) {\n                    polygonAppend(lowerPoly, poly,i,closestIndex+1);\n                    if (closestIndex !== 0){\n                        polygonAppend(upperPoly, poly,closestIndex,v.length);\n                    }\n                    polygonAppend(upperPoly, poly,0,i+1);\n                } else {\n                    if (i !== 0){\n                        polygonAppend(lowerPoly, poly,i,v.length);\n                    }\n                    polygonAppend(lowerPoly, poly,0,closestIndex+1);\n                    polygonAppend(upperPoly, poly,closestIndex,i+1);\n                }\n            }\n\n            // solve smallest poly first\n            if (lowerPoly.length < upperPoly.length) {\n                polygonQuickDecomp(lowerPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);\n                polygonQuickDecomp(upperPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);\n            } else {\n                polygonQuickDecomp(upperPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);\n                polygonQuickDecomp(lowerPoly,result,reflexVertices,steinerPoints,delta,maxlevel,level);\n            }\n\n            return result;\n        }\n    }\n    result.push(polygon);\n\n    return result;\n}\n\n/**\n * Remove collinear points in the polygon.\n * @method removeCollinearPoints\n * @param  {Number} [precision] The threshold angle to use when determining whether two edges are collinear. Use zero for finest precision.\n * @return {Number}           The number of points removed\n */\nfunction polygonRemoveCollinearPoints(polygon, precision){\n    var num = 0;\n    for(var i=polygon.length-1; polygon.length>3 && i>=0; --i){\n        if(collinear(polygonAt(polygon, i-1),polygonAt(polygon, i),polygonAt(polygon, i+1),precision)){\n            // Remove the middle point\n            polygon.splice(i%polygon.length,1);\n            num++;\n        }\n    }\n    return num;\n}\n\n/**\n * Check if two scalars are equal\n * @static\n * @method eq\n * @param  {Number} a\n * @param  {Number} b\n * @param  {Number} [precision]\n * @return {Boolean}\n */\nfunction scalar_eq(a,b,precision){\n    precision = precision || 0;\n    return Math.abs(a-b) < precision;\n}\n"]}
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"matter-js":[function(require,module,exports){
(function (global){
/**
* matter-js 0.13.0 by @liabru 2017-07-06
* http://brm.io/matter-js/
* License MIT
*/
/**
* The MIT License (MIT)
*
* Copyright (c) Liam Brummitt and contributors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Matter = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
/**
* The `Matter.Body` module contains methods for creating and manipulating body models.
* A `Matter.Body` is a rigid body that can be simulated by a `Matter.Engine`.
* Factories for commonly used body configurations (such as rectangles, circles and other polygons) can be found in the module `Matter.Bodies`.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
* @class Body
*/
var Body = {};
module.exports = Body;
var Vertices = _dereq_('../geometry/Vertices');
var Vector = _dereq_('../geometry/Vector');
var Sleeping = _dereq_('../core/Sleeping');
var Render = _dereq_('../render/Render');
var Common = _dereq_('../core/Common');
var Bounds = _dereq_('../geometry/Bounds');
var Axes = _dereq_('../geometry/Axes');
(function() {
Body._inertiaScale = 4;
Body._nextCollidingGroupId = 1;
Body._nextNonCollidingGroupId = -1;
Body._nextCategory = 0x0001;
/**
* Creates a new rigid body model. The options parameter is an object that specifies any properties you wish to override the defaults.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* Vertices must be specified in clockwise order.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {} options
* @return {body} body
*/
Body.create = function(options) {
var defaults = {
id: Common.nextId(),
type: 'body',
label: 'Body',
parts: [],
plugin: {},
angle: 0,
vertices: Vertices.fromPath('L 0 0 L 40 0 L 40 40 L 0 40'),
position: { x: 0, y: 0 },
force: { x: 0, y: 0 },
torque: 0,
positionImpulse: { x: 0, y: 0 },
constraintImpulse: { x: 0, y: 0, angle: 0 },
totalContacts: 0,
speed: 0,
angularSpeed: 0,
velocity: { x: 0, y: 0 },
angularVelocity: 0,
isSensor: false,
isStatic: false,
isSleeping: false,
motion: 0,
sleepThreshold: 60,
density: 0.001,
restitution: 0,
friction: 0.1,
frictionStatic: 0.5,
frictionAir: 0.01,
collisionFilter: {
category: 0x0001,
mask: 0xFFFFFFFF,
group: 0
},
slop: 0.05,
timeScale: 1,
render: {
visible: true,
opacity: 1,
sprite: {
xScale: 1,
yScale: 1,
xOffset: 0,
yOffset: 0
},
lineWidth: 0
}
};
var body = Common.extend(defaults, options);
_initProperties(body, options);
return body;
};
/**
* Returns the next unique group index for which bodies will collide.
* If `isNonColliding` is `true`, returns the next unique group index for which bodies will _not_ collide.
* See `body.collisionFilter` for more information.
* @method nextGroup
* @param {bool} [isNonColliding=false]
* @return {Number} Unique group index
*/
Body.nextGroup = function(isNonColliding) {
if (isNonColliding)
return Body._nextNonCollidingGroupId--;
return Body._nextCollidingGroupId++;
};
/**
* Returns the next unique category bitfield (starting after the initial default category `0x0001`).
* There are 32 available. See `body.collisionFilter` for more information.
* @method nextCategory
* @return {Number} Unique category bitfield
*/
Body.nextCategory = function() {
Body._nextCategory = Body._nextCategory << 1;
return Body._nextCategory;
};
/**
* Initialises body properties.
* @method _initProperties
* @private
* @param {body} body
* @param {} [options]
*/
var _initProperties = function(body, options) {
options = options || {};
// init required properties (order is important)
Body.set(body, {
bounds: body.bounds || Bounds.create(body.vertices),
positionPrev: body.positionPrev || Vector.clone(body.position),
anglePrev: body.anglePrev || body.angle,
vertices: body.vertices,
parts: body.parts || [body],
isStatic: body.isStatic,
isSleeping: body.isSleeping,
parent: body.parent || body
});
Vertices.rotate(body.vertices, body.angle, body.position);
Axes.rotate(body.axes, body.angle);
Bounds.update(body.bounds, body.vertices, body.velocity);
// allow options to override the automatically calculated properties
Body.set(body, {
axes: options.axes || body.axes,
area: options.area || body.area,
mass: options.mass || body.mass,
inertia: options.inertia || body.inertia
});
// render properties
var defaultFillStyle = (body.isStatic ? '#2e2b44' : Common.choose(['#006BA6', '#0496FF', '#FFBC42', '#D81159', '#8F2D56'])),
defaultStrokeStyle = '#000';
body.render.fillStyle = body.render.fillStyle || defaultFillStyle;
body.render.strokeStyle = body.render.strokeStyle || defaultStrokeStyle;
body.render.sprite.xOffset += -(body.bounds.min.x - body.position.x) / (body.bounds.max.x - body.bounds.min.x);
body.render.sprite.yOffset += -(body.bounds.min.y - body.position.y) / (body.bounds.max.y - body.bounds.min.y);
};
/**
* Given a property and a value (or map of), sets the property(s) on the body, using the appropriate setter functions if they exist.
* Prefer to use the actual setter functions in performance critical situations.
* @method set
* @param {body} body
* @param {} settings A property name (or map of properties and values) to set on the body.
* @param {} value The value to set if `settings` is a single property name.
*/
Body.set = function(body, settings, value) {
var property;
if (typeof settings === 'string') {
property = settings;
settings = {};
settings[property] = value;
}
for (property in settings) {
value = settings[property];
if (!settings.hasOwnProperty(property))
continue;
switch (property) {
case 'isStatic':
Body.setStatic(body, value);
break;
case 'isSleeping':
Sleeping.set(body, value);
break;
case 'mass':
Body.setMass(body, value);
break;
case 'density':
Body.setDensity(body, value);
break;
case 'inertia':
Body.setInertia(body, value);
break;
case 'vertices':
Body.setVertices(body, value);
break;
case 'position':
Body.setPosition(body, value);
break;
case 'angle':
Body.setAngle(body, value);
break;
case 'velocity':
Body.setVelocity(body, value);
break;
case 'angularVelocity':
Body.setAngularVelocity(body, value);
break;
case 'parts':
Body.setParts(body, value);
break;
default:
body[property] = value;
}
}
};
/**
* Sets the body as static, including isStatic flag and setting mass and inertia to Infinity.
* @method setStatic
* @param {body} body
* @param {bool} isStatic
*/
Body.setStatic = function(body, isStatic) {
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.isStatic = isStatic;
if (isStatic) {
part._original = {
restitution: part.restitution,
friction: part.friction,
mass: part.mass,
inertia: part.inertia,
density: part.density,
inverseMass: part.inverseMass,
inverseInertia: part.inverseInertia
};
part.restitution = 0;
part.friction = 1;
part.mass = part.inertia = part.density = Infinity;
part.inverseMass = part.inverseInertia = 0;
part.positionPrev.x = part.position.x;
part.positionPrev.y = part.position.y;
part.anglePrev = part.angle;
part.angularVelocity = 0;
part.speed = 0;
part.angularSpeed = 0;
part.motion = 0;
} else if (part._original) {
part.restitution = part._original.restitution;
part.friction = part._original.friction;
part.mass = part._original.mass;
part.inertia = part._original.inertia;
part.density = part._original.density;
part.inverseMass = part._original.inverseMass;
part.inverseInertia = part._original.inverseInertia;
delete part._original;
}
}
};
/**
* Sets the mass of the body. Inverse mass and density are automatically updated to reflect the change.
* @method setMass
* @param {body} body
* @param {number} mass
*/
Body.setMass = function(body, mass) {
body.mass = mass;
body.inverseMass = 1 / body.mass;
body.density = body.mass / body.area;
};
/**
* Sets the density of the body. Mass is automatically updated to reflect the change.
* @method setDensity
* @param {body} body
* @param {number} density
*/
Body.setDensity = function(body, density) {
Body.setMass(body, density * body.area);
body.density = density;
};
/**
* Sets the moment of inertia (i.e. second moment of area) of the body of the body.
* Inverse inertia is automatically updated to reflect the change. Mass is not changed.
* @method setInertia
* @param {body} body
* @param {number} inertia
*/
Body.setInertia = function(body, inertia) {
body.inertia = inertia;
body.inverseInertia = 1 / body.inertia;
};
/**
* Sets the body's vertices and updates body properties accordingly, including inertia, area and mass (with respect to `body.density`).
* Vertices will be automatically transformed to be orientated around their centre of mass as the origin.
* They are then automatically translated to world space based on `body.position`.
*
* The `vertices` argument should be passed as an array of `Matter.Vector` points (or a `Matter.Vertices` array).
* Vertices must form a convex hull, concave hulls are not supported.
*
* @method setVertices
* @param {body} body
* @param {vector[]} vertices
*/
Body.setVertices = function(body, vertices) {
// change vertices
if (vertices[0].body === body) {
body.vertices = vertices;
} else {
body.vertices = Vertices.create(vertices, body);
}
// update properties
body.axes = Axes.fromVertices(body.vertices);
body.area = Vertices.area(body.vertices);
Body.setMass(body, body.density * body.area);
// orient vertices around the centre of mass at origin (0, 0)
var centre = Vertices.centre(body.vertices);
Vertices.translate(body.vertices, centre, -1);
// update inertia while vertices are at origin (0, 0)
Body.setInertia(body, Body._inertiaScale * Vertices.inertia(body.vertices, body.mass));
// update geometry
Vertices.translate(body.vertices, body.position);
Bounds.update(body.bounds, body.vertices, body.velocity);
};
/**
* Sets the parts of the `body` and updates mass, inertia and centroid.
* Each part will have its parent set to `body`.
* By default the convex hull will be automatically computed and set on `body`, unless `autoHull` is set to `false.`
* Note that this method will ensure that the first part in `body.parts` will always be the `body`.
* @method setParts
* @param {body} body
* @param [body] parts
* @param {bool} [autoHull=true]
*/
Body.setParts = function(body, parts, autoHull) {
var i;
// add all the parts, ensuring that the first part is always the parent body
parts = parts.slice(0);
body.parts.length = 0;
body.parts.push(body);
body.parent = body;
for (i = 0; i < parts.length; i++) {
var part = parts[i];
if (part !== body) {
part.parent = body;
body.parts.push(part);
}
}
if (body.parts.length === 1)
return;
autoHull = typeof autoHull !== 'undefined' ? autoHull : true;
// find the convex hull of all parts to set on the parent body
if (autoHull) {
var vertices = [];
for (i = 0; i < parts.length; i++) {
vertices = vertices.concat(parts[i].vertices);
}
Vertices.clockwiseSort(vertices);
var hull = Vertices.hull(vertices),
hullCentre = Vertices.centre(hull);
Body.setVertices(body, hull);
Vertices.translate(body.vertices, hullCentre);
}
// sum the properties of all compound parts of the parent body
var total = _totalProperties(body);
body.area = total.area;
body.parent = body;
body.position.x = total.centre.x;
body.position.y = total.centre.y;
body.positionPrev.x = total.centre.x;
body.positionPrev.y = total.centre.y;
Body.setMass(body, total.mass);
Body.setInertia(body, total.inertia);
Body.setPosition(body, total.centre);
};
/**
* Sets the position of the body instantly. Velocity, angle, force etc. are unchanged.
* @method setPosition
* @param {body} body
* @param {vector} position
*/
Body.setPosition = function(body, position) {
var delta = Vector.sub(position, body.position);
body.positionPrev.x += delta.x;
body.positionPrev.y += delta.y;
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.position.x += delta.x;
part.position.y += delta.y;
Vertices.translate(part.vertices, delta);
Bounds.update(part.bounds, part.vertices, body.velocity);
}
};
/**
* Sets the angle of the body instantly. Angular velocity, position, force etc. are unchanged.
* @method setAngle
* @param {body} body
* @param {number} angle
*/
Body.setAngle = function(body, angle) {
var delta = angle - body.angle;
body.anglePrev += delta;
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
part.angle += delta;
Vertices.rotate(part.vertices, delta, body.position);
Axes.rotate(part.axes, delta);
Bounds.update(part.bounds, part.vertices, body.velocity);
if (i > 0) {
Vector.rotateAbout(part.position, delta, body.position, part.position);
}
}
};
/**
* Sets the linear velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
* @method setVelocity
* @param {body} body
* @param {vector} velocity
*/
Body.setVelocity = function(body, velocity) {
body.positionPrev.x = body.position.x - velocity.x;
body.positionPrev.y = body.position.y - velocity.y;
body.velocity.x = velocity.x;
body.velocity.y = velocity.y;
body.speed = Vector.magnitude(body.velocity);
};
/**
* Sets the angular velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
* @method setAngularVelocity
* @param {body} body
* @param {number} velocity
*/
Body.setAngularVelocity = function(body, velocity) {
body.anglePrev = body.angle - velocity;
body.angularVelocity = velocity;
body.angularSpeed = Math.abs(body.angularVelocity);
};
/**
* Moves a body by a given vector relative to its current position, without imparting any velocity.
* @method translate
* @param {body} body
* @param {vector} translation
*/
Body.translate = function(body, translation) {
Body.setPosition(body, Vector.add(body.position, translation));
};
/**
* Rotates a body by a given angle relative to its current angle, without imparting any angular velocity.
* @method rotate
* @param {body} body
* @param {number} rotation
* @param {vector} [point]
*/
Body.rotate = function(body, rotation, point) {
if (!point) {
Body.setAngle(body, body.angle + rotation);
} else {
var cos = Math.cos(rotation),
sin = Math.sin(rotation),
dx = body.position.x - point.x,
dy = body.position.y - point.y;
Body.setPosition(body, {
x: point.x + (dx * cos - dy * sin),
y: point.y + (dx * sin + dy * cos)
});
Body.setAngle(body, body.angle + rotation);
}
};
/**
* Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).
* @method scale
* @param {body} body
* @param {number} scaleX
* @param {number} scaleY
* @param {vector} [point]
*/
Body.scale = function(body, scaleX, scaleY, point) {
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
// scale vertices
Vertices.scale(part.vertices, scaleX, scaleY, body.position);
// update properties
part.axes = Axes.fromVertices(part.vertices);
if (!body.isStatic) {
part.area = Vertices.area(part.vertices);
Body.setMass(part, body.density * part.area);
// update inertia (requires vertices to be at origin)
Vertices.translate(part.vertices, { x: -part.position.x, y: -part.position.y });
Body.setInertia(part, Vertices.inertia(part.vertices, part.mass));
Vertices.translate(part.vertices, { x: part.position.x, y: part.position.y });
}
// update bounds
Bounds.update(part.bounds, part.vertices, body.velocity);
}
// handle circles
if (body.circleRadius) {
if (scaleX === scaleY) {
body.circleRadius *= scaleX;
} else {
// body is no longer a circle
body.circleRadius = null;
}
}
if (!body.isStatic) {
var total = _totalProperties(body);
body.area = total.area;
Body.setMass(body, total.mass);
Body.setInertia(body, total.inertia);
}
};
/**
* Performs a simulation step for the given `body`, including updating position and angle using Verlet integration.
* @method update
* @param {body} body
* @param {number} deltaTime
* @param {number} timeScale
* @param {number} correction
*/
Body.update = function(body, deltaTime, timeScale, correction) {
var deltaTimeSquared = Math.pow(deltaTime * timeScale * body.timeScale, 2);
// from the previous step
var frictionAir = 1 - body.frictionAir * timeScale * body.timeScale,
velocityPrevX = body.position.x - body.positionPrev.x,
velocityPrevY = body.position.y - body.positionPrev.y;
// update velocity with Verlet integration
body.velocity.x = (velocityPrevX * frictionAir * correction) + (body.force.x / body.mass) * deltaTimeSquared;
body.velocity.y = (velocityPrevY * frictionAir * correction) + (body.force.y / body.mass) * deltaTimeSquared;
body.positionPrev.x = body.position.x;
body.positionPrev.y = body.position.y;
body.position.x += body.velocity.x;
body.position.y += body.velocity.y;
// update angular velocity with Verlet integration
body.angularVelocity = ((body.angle - body.anglePrev) * frictionAir * correction) + (body.torque / body.inertia) * deltaTimeSquared;
body.anglePrev = body.angle;
body.angle += body.angularVelocity;
// track speed and acceleration
body.speed = Vector.magnitude(body.velocity);
body.angularSpeed = Math.abs(body.angularVelocity);
// transform the body geometry
for (var i = 0; i < body.parts.length; i++) {
var part = body.parts[i];
Vertices.translate(part.vertices, body.velocity);
if (i > 0) {
part.position.x += body.velocity.x;
part.position.y += body.velocity.y;
}
if (body.angularVelocity !== 0) {
Vertices.rotate(part.vertices, body.angularVelocity, body.position);
Axes.rotate(part.axes, body.angularVelocity);
if (i > 0) {
Vector.rotateAbout(part.position, body.angularVelocity, body.position, part.position);
}
}
Bounds.update(part.bounds, part.vertices, body.velocity);
}
};
/**
* Applies a force to a body from a given world-space position, including resulting torque.
* @method applyForce
* @param {body} body
* @param {vector} position
* @param {vector} force
*/
Body.applyForce = function(body, position, force) {
body.force.x += force.x;
body.force.y += force.y;
var offset = { x: position.x - body.position.x, y: position.y - body.position.y };
body.torque += offset.x * force.y - offset.y * force.x;
};
/**
* Returns the sums of the properties of all compound parts of the parent body.
* @method _totalProperties
* @private
* @param {body} body
* @return {}
*/
var _totalProperties = function(body) {
// from equations at:
// https://ecourses.ou.edu/cgi-bin/ebook.cgi?doc=&topic=st&chap_sec=07.2&page=theory
// http://output.to/sideway/default.asp?qno=121100087
var properties = {
mass: 0,
area: 0,
inertia: 0,
centre: { x: 0, y: 0 }
};
// sum the properties of all compound parts of the parent body
for (var i = body.parts.length === 1 ? 0 : 1; i < body.parts.length; i++) {
var part = body.parts[i];
properties.mass += part.mass;
properties.area += part.area;
properties.inertia += part.inertia;
properties.centre = Vector.add(properties.centre,
Vector.mult(part.position, part.mass !== Infinity ? part.mass : 1));
}
properties.centre = Vector.div(properties.centre,
properties.mass !== Infinity ? properties.mass : body.parts.length);
return properties;
};
/*
*
* Events Documentation
*
*/
/**
* Fired when a body starts sleeping (where `this` is the body).
*
* @event sleepStart
* @this {body} The body that has started sleeping
* @param {} event An event object
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when a body ends sleeping (where `this` is the body).
*
* @event sleepEnd
* @this {body} The body that has ended sleeping
* @param {} event An event object
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/*
*
* Properties Documentation
*
*/
/**
* An integer `Number` uniquely identifying number generated in `Body.create` by `Common.nextId`.
*
* @property id
* @type number
*/
/**
* A `String` denoting the type of object.
*
* @property type
* @type string
* @default "body"
* @readOnly
*/
/**
* An arbitrary `String` name to help the user identify and manage bodies.
*
* @property label
* @type string
* @default "Body"
*/
/**
* An array of bodies that make up this body.
* The first body in the array must always be a self reference to the current body instance.
* All bodies in the `parts` array together form a single rigid compound body.
* Parts are allowed to overlap, have gaps or holes or even form concave bodies.
* Parts themselves should never be added to a `World`, only the parent body should be.
* Use `Body.setParts` when setting parts to ensure correct updates of all properties.
*
* @property parts
* @type body[]
*/
/**
* An object reserved for storing plugin-specific properties.
*
* @property plugin
* @type {}
*/
/**
* A self reference if the body is _not_ a part of another body.
* Otherwise this is a reference to the body that this is a part of.
* See `body.parts`.
*
* @property parent
* @type body
*/
/**
* A `Number` specifying the angle of the body, in radians.
*
* @property angle
* @type number
* @default 0
*/
/**
* An array of `Vector` objects that specify the convex hull of the rigid body.
* These should be provided about the origin `(0, 0)`. E.g.
*
* [{ x: 0, y: 0 }, { x: 25, y: 50 }, { x: 50, y: 0 }]
*
* When passed via `Body.create`, the vertices are translated relative to `body.position` (i.e. world-space, and constantly updated by `Body.update` during simulation).
* The `Vector` objects are also augmented with additional properties required for efficient collision detection.
*
* Other properties such as `inertia` and `bounds` are automatically calculated from the passed vertices (unless provided via `options`).
* Concave hulls are not currently supported. The module `Matter.Vertices` contains useful methods for working with vertices.
*
* @property vertices
* @type vector[]
*/
/**
* A `Vector` that specifies the current world-space position of the body.
*
* @property position
* @type vector
* @default { x: 0, y: 0 }
*/
/**
* A `Vector` that specifies the force to apply in the current step. It is zeroed after every `Body.update`. See also `Body.applyForce`.
*
* @property force
* @type vector
* @default { x: 0, y: 0 }
*/
/**
* A `Number` that specifies the torque (turning force) to apply in the current step. It is zeroed after every `Body.update`.
*
* @property torque
* @type number
* @default 0
*/
/**
* A `Number` that _measures_ the current speed of the body after the last `Body.update`. It is read-only and always positive (it's the magnitude of `body.velocity`).
*
* @readOnly
* @property speed
* @type number
* @default 0
*/
/**
* A `Number` that _measures_ the current angular speed of the body after the last `Body.update`. It is read-only and always positive (it's the magnitude of `body.angularVelocity`).
*
* @readOnly
* @property angularSpeed
* @type number
* @default 0
*/
/**
* A `Vector` that _measures_ the current velocity of the body after the last `Body.update`. It is read-only.
* If you need to modify a body's velocity directly, you should either apply a force or simply change the body's `position` (as the engine uses position-Verlet integration).
*
* @readOnly
* @property velocity
* @type vector
* @default { x: 0, y: 0 }
*/
/**
* A `Number` that _measures_ the current angular velocity of the body after the last `Body.update`. It is read-only.
* If you need to modify a body's angular velocity directly, you should apply a torque or simply change the body's `angle` (as the engine uses position-Verlet integration).
*
* @readOnly
* @property angularVelocity
* @type number
* @default 0
*/
/**
* A flag that indicates whether a body is considered static. A static body can never change position or angle and is completely fixed.
* If you need to set a body as static after its creation, you should use `Body.setStatic` as this requires more than just setting this flag.
*
* @property isStatic
* @type boolean
* @default false
*/
/**
* A flag that indicates whether a body is a sensor. Sensor triggers collision events, but doesn't react with colliding body physically.
*
* @property isSensor
* @type boolean
* @default false
*/
/**
* A flag that indicates whether the body is considered sleeping. A sleeping body acts similar to a static body, except it is only temporary and can be awoken.
* If you need to set a body as sleeping, you should use `Sleeping.set` as this requires more than just setting this flag.
*
* @property isSleeping
* @type boolean
* @default false
*/
/**
* A `Number` that _measures_ the amount of movement a body currently has (a combination of `speed` and `angularSpeed`). It is read-only and always positive.
* It is used and updated by the `Matter.Sleeping` module during simulation to decide if a body has come to rest.
*
* @readOnly
* @property motion
* @type number
* @default 0
*/
/**
* A `Number` that defines the number of updates in which this body must have near-zero velocity before it is set as sleeping by the `Matter.Sleeping` module (if sleeping is enabled by the engine).
*
* @property sleepThreshold
* @type number
* @default 60
*/
/**
* A `Number` that defines the density of the body, that is its mass per unit area.
* If you pass the density via `Body.create` the `mass` property is automatically calculated for you based on the size (area) of the object.
* This is generally preferable to simply setting mass and allows for more intuitive definition of materials (e.g. rock has a higher density than wood).
*
* @property density
* @type number
* @default 0.001
*/
/**
* A `Number` that defines the mass of the body, although it may be more appropriate to specify the `density` property instead.
* If you modify this value, you must also modify the `body.inverseMass` property (`1 / mass`).
*
* @property mass
* @type number
*/
/**
* A `Number` that defines the inverse mass of the body (`1 / mass`).
* If you modify this value, you must also modify the `body.mass` property.
*
* @property inverseMass
* @type number
*/
/**
* A `Number` that defines the moment of inertia (i.e. second moment of area) of the body.
* It is automatically calculated from the given convex hull (`vertices` array) and density in `Body.create`.
* If you modify this value, you must also modify the `body.inverseInertia` property (`1 / inertia`).
*
* @property inertia
* @type number
*/
/**
* A `Number` that defines the inverse moment of inertia of the body (`1 / inertia`).
* If you modify this value, you must also modify the `body.inertia` property.
*
* @property inverseInertia
* @type number
*/
/**
* A `Number` that defines the restitution (elasticity) of the body. The value is always positive and is in the range `(0, 1)`.
* A value of `0` means collisions may be perfectly inelastic and no bouncing may occur.
* A value of `0.8` means the body may bounce back with approximately 80% of its kinetic energy.
* Note that collision response is based on _pairs_ of bodies, and that `restitution` values are _combined_ with the following formula:
*
* Math.max(bodyA.restitution, bodyB.restitution)
*
* @property restitution
* @type number
* @default 0
*/
/**
* A `Number` that defines the friction of the body. The value is always positive and is in the range `(0, 1)`.
* A value of `0` means that the body may slide indefinitely.
* A value of `1` means the body may come to a stop almost instantly after a force is applied.
*
* The effects of the value may be non-linear.
* High values may be unstable depending on the body.
* The engine uses a Coulomb friction model including static and kinetic friction.
* Note that collision response is based on _pairs_ of bodies, and that `friction` values are _combined_ with the following formula:
*
* Math.min(bodyA.friction, bodyB.friction)
*
* @property friction
* @type number
* @default 0.1
*/
/**
* A `Number` that defines the static friction of the body (in the Coulomb friction model).
* A value of `0` means the body will never 'stick' when it is nearly stationary and only dynamic `friction` is used.
* The higher the value (e.g. `10`), the more force it will take to initially get the body moving when nearly stationary.
* This value is multiplied with the `friction` property to make it easier to change `friction` and maintain an appropriate amount of static friction.
*
* @property frictionStatic
* @type number
* @default 0.5
*/
/**
* A `Number` that defines the air friction of the body (air resistance).
* A value of `0` means the body will never slow as it moves through space.
* The higher the value, the faster a body slows when moving through space.
* The effects of the value are non-linear.
*
* @property frictionAir
* @type number
* @default 0.01
*/
/**
* An `Object` that specifies the collision filtering properties of this body.
*
* Collisions between two bodies will obey the following rules:
* - If the two bodies have the same non-zero value of `collisionFilter.group`,
* they will always collide if the value is positive, and they will never collide
* if the value is negative.
* - If the two bodies have different values of `collisionFilter.group` or if one
* (or both) of the bodies has a value of 0, then the category/mask rules apply as follows:
*
* Each body belongs to a collision category, given by `collisionFilter.category`. This
* value is used as a bit field and the category should have only one bit set, meaning that
* the value of this property is a power of two in the range [1, 2^31]. Thus, there are 32
* different collision categories available.
*
* Each body also defines a collision bitmask, given by `collisionFilter.mask` which specifies
* the categories it collides with (the value is the bitwise AND value of all these categories).
*
* Using the category/mask rules, two bodies `A` and `B` collide if each includes the other's
* category in its mask, i.e. `(categoryA & maskB) !== 0` and `(categoryB & maskA) !== 0`
* are both true.
*
* @property collisionFilter
* @type object
*/
/**
* An Integer `Number`, that specifies the collision group this body belongs to.
* See `body.collisionFilter` for more information.
*
* @property collisionFilter.group
* @type object
* @default 0
*/
/**
* A bit field that specifies the collision category this body belongs to.
* The category value should have only one bit set, for example `0x0001`.
* This means there are up to 32 unique collision categories available.
* See `body.collisionFilter` for more information.
*
* @property collisionFilter.category
* @type object
* @default 1
*/
/**
* A bit mask that specifies the collision categories this body may collide with.
* See `body.collisionFilter` for more information.
*
* @property collisionFilter.mask
* @type object
* @default -1
*/
/**
* A `Number` that specifies a tolerance on how far a body is allowed to 'sink' or rotate into other bodies.
* Avoid changing this value unless you understand the purpose of `slop` in physics engines.
* The default should generally suffice, although very large bodies may require larger values for stable stacking.
*
* @property slop
* @type number
* @default 0.05
*/
/**
* A `Number` that allows per-body time scaling, e.g. a force-field where bodies inside are in slow-motion, while others are at full speed.
*
* @property timeScale
* @type number
* @default 1
*/
/**
* An `Object` that defines the rendering properties to be consumed by the module `Matter.Render`.
*
* @property render
* @type object
*/
/**
* A flag that indicates if the body should be rendered.
*
* @property render.visible
* @type boolean
* @default true
*/
/**
* Sets the opacity to use when rendering.
*
* @property render.opacity
* @type number
* @default 1
*/
/**
* An `Object` that defines the sprite properties to use when rendering, if any.
*
* @property render.sprite
* @type object
*/
/**
* An `String` that defines the path to the image to use as the sprite texture, if any.
*
* @property render.sprite.texture
* @type string
*/
/**
* A `Number` that defines the scaling in the x-axis for the sprite, if any.
*
* @property render.sprite.xScale
* @type number
* @default 1
*/
/**
* A `Number` that defines the scaling in the y-axis for the sprite, if any.
*
* @property render.sprite.yScale
* @type number
* @default 1
*/
/**
* A `Number` that defines the offset in the x-axis for the sprite (normalised by texture width).
*
* @property render.sprite.xOffset
* @type number
* @default 0
*/
/**
* A `Number` that defines the offset in the y-axis for the sprite (normalised by texture height).
*
* @property render.sprite.yOffset
* @type number
* @default 0
*/
/**
* A `Number` that defines the line width to use when rendering the body outline (if a sprite is not defined).
* A value of `0` means no outline will be rendered.
*
* @property render.lineWidth
* @type number
* @default 0
*/
/**
* A `String` that defines the fill style to use when rendering the body (if a sprite is not defined).
* It is the same as when using a canvas, so it accepts CSS style property values.
*
* @property render.fillStyle
* @type string
* @default a random colour
*/
/**
* A `String` that defines the stroke style to use when rendering the body outline (if a sprite is not defined).
* It is the same as when using a canvas, so it accepts CSS style property values.
*
* @property render.strokeStyle
* @type string
* @default a random colour
*/
/**
* An array of unique axis vectors (edge normals) used for collision detection.
* These are automatically calculated from the given convex hull (`vertices` array) in `Body.create`.
* They are constantly updated by `Body.update` during the simulation.
*
* @property axes
* @type vector[]
*/
/**
* A `Number` that _measures_ the area of the body's convex hull, calculated at creation by `Body.create`.
*
* @property area
* @type string
* @default
*/
/**
* A `Bounds` object that defines the AABB region for the body.
* It is automatically calculated from the given convex hull (`vertices` array) in `Body.create` and constantly updated by `Body.update` during simulation.
*
* @property bounds
* @type bounds
*/
})();
},{"../core/Common":14,"../core/Sleeping":22,"../geometry/Axes":25,"../geometry/Bounds":26,"../geometry/Vector":28,"../geometry/Vertices":29,"../render/Render":31}],2:[function(_dereq_,module,exports){
/**
* The `Matter.Composite` module contains methods for creating and manipulating composite bodies.
* A composite body is a collection of `Matter.Body`, `Matter.Constraint` and other `Matter.Composite`, therefore composites form a tree structure.
* It is important to use the functions in this module to modify composites, rather than directly modifying their properties.
* Note that the `Matter.World` object is also a type of `Matter.Composite` and as such all composite methods here can also operate on a `Matter.World`.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Composite
*/
var Composite = {};
module.exports = Composite;
var Events = _dereq_('../core/Events');
var Common = _dereq_('../core/Common');
var Body = _dereq_('./Body');
(function() {
/**
* Creates a new composite. The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properites section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {} [options]
* @return {composite} A new composite
*/
Composite.create = function(options) {
return Common.extend({
id: Common.nextId(),
type: 'composite',
parent: null,
isModified: false,
bodies: [],
constraints: [],
composites: [],
label: 'Composite',
plugin: {}
}, options);
};
/**
* Sets the composite's `isModified` flag.
* If `updateParents` is true, all parents will be set (default: false).
* If `updateChildren` is true, all children will be set (default: false).
* @method setModified
* @param {composite} composite
* @param {boolean} isModified
* @param {boolean} [updateParents=false]
* @param {boolean} [updateChildren=false]
*/
Composite.setModified = function(composite, isModified, updateParents, updateChildren) {
composite.isModified = isModified;
if (updateParents && composite.parent) {
Composite.setModified(composite.parent, isModified, updateParents, updateChildren);
}
if (updateChildren) {
for(var i = 0; i < composite.composites.length; i++) {
var childComposite = composite.composites[i];
Composite.setModified(childComposite, isModified, updateParents, updateChildren);
}
}
};
/**
* Generic add function. Adds one or many body(s), constraint(s) or a composite(s) to the given composite.
* Triggers `beforeAdd` and `afterAdd` events on the `composite`.
* @method add
* @param {composite} composite
* @param {} object
* @return {composite} The original composite with the objects added
*/
Composite.add = function(composite, object) {
var objects = [].concat(object);
Events.trigger(composite, 'beforeAdd', { object: object });
for (var i = 0; i < objects.length; i++) {
var obj = objects[i];
switch (obj.type) {
case 'body':
// skip adding compound parts
if (obj.parent !== obj) {
Common.warn('Composite.add: skipped adding a compound body part (you must add its parent instead)');
break;
}
Composite.addBody(composite, obj);
break;
case 'constraint':
Composite.addConstraint(composite, obj);
break;
case 'composite':
Composite.addComposite(composite, obj);
break;
case 'mouseConstraint':
Composite.addConstraint(composite, obj.constraint);
break;
}
}
Events.trigger(composite, 'afterAdd', { object: object });
return composite;
};
/**
* Generic remove function. Removes one or many body(s), constraint(s) or a composite(s) to the given composite.
* Optionally searching its children recursively.
* Triggers `beforeRemove` and `afterRemove` events on the `composite`.
* @method remove
* @param {composite} composite
* @param {} object
* @param {boolean} [deep=false]
* @return {composite} The original composite with the objects removed
*/
Composite.remove = function(composite, object, deep) {
var objects = [].concat(object);
Events.trigger(composite, 'beforeRemove', { object: object });
for (var i = 0; i < objects.length; i++) {
var obj = objects[i];
switch (obj.type) {
case 'body':
Composite.removeBody(composite, obj, deep);
break;
case 'constraint':
Composite.removeConstraint(composite, obj, deep);
break;
case 'composite':
Composite.removeComposite(composite, obj, deep);
break;
case 'mouseConstraint':
Composite.removeConstraint(composite, obj.constraint);
break;
}
}
Events.trigger(composite, 'afterRemove', { object: object });
return composite;
};
/**
* Adds a composite to the given composite.
* @private
* @method addComposite
* @param {composite} compositeA
* @param {composite} compositeB
* @return {composite} The original compositeA with the objects from compositeB added
*/
Composite.addComposite = function(compositeA, compositeB) {
compositeA.composites.push(compositeB);
compositeB.parent = compositeA;
Composite.setModified(compositeA, true, true, false);
return compositeA;
};
/**
* Removes a composite from the given composite, and optionally searching its children recursively.
* @private
* @method removeComposite
* @param {composite} compositeA
* @param {composite} compositeB
* @param {boolean} [deep=false]
* @return {composite} The original compositeA with the composite removed
*/
Composite.removeComposite = function(compositeA, compositeB, deep) {
var position = Common.indexOf(compositeA.composites, compositeB);
if (position !== -1) {
Composite.removeCompositeAt(compositeA, position);
Composite.setModified(compositeA, true, true, false);
}
if (deep) {
for (var i = 0; i < compositeA.composites.length; i++){
Composite.removeComposite(compositeA.composites[i], compositeB, true);
}
}
return compositeA;
};
/**
* Removes a composite from the given composite.
* @private
* @method removeCompositeAt
* @param {composite} composite
* @param {number} position
* @return {composite} The original composite with the composite removed
*/
Composite.removeCompositeAt = function(composite, position) {
composite.composites.splice(position, 1);
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Adds a body to the given composite.
* @private
* @method addBody
* @param {composite} composite
* @param {body} body
* @return {composite} The original composite with the body added
*/
Composite.addBody = function(composite, body) {
composite.bodies.push(body);
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Removes a body from the given composite, and optionally searching its children recursively.
* @private
* @method removeBody
* @param {composite} composite
* @param {body} body
* @param {boolean} [deep=false]
* @return {composite} The original composite with the body removed
*/
Composite.removeBody = function(composite, body, deep) {
var position = Common.indexOf(composite.bodies, body);
if (position !== -1) {
Composite.removeBodyAt(composite, position);
Composite.setModified(composite, true, true, false);
}
if (deep) {
for (var i = 0; i < composite.composites.length; i++){
Composite.removeBody(composite.composites[i], body, true);
}
}
return composite;
};
/**
* Removes a body from the given composite.
* @private
* @method removeBodyAt
* @param {composite} composite
* @param {number} position
* @return {composite} The original composite with the body removed
*/
Composite.removeBodyAt = function(composite, position) {
composite.bodies.splice(position, 1);
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Adds a constraint to the given composite.
* @private
* @method addConstraint
* @param {composite} composite
* @param {constraint} constraint
* @return {composite} The original composite with the constraint added
*/
Composite.addConstraint = function(composite, constraint) {
composite.constraints.push(constraint);
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Removes a constraint from the given composite, and optionally searching its children recursively.
* @private
* @method removeConstraint
* @param {composite} composite
* @param {constraint} constraint
* @param {boolean} [deep=false]
* @return {composite} The original composite with the constraint removed
*/
Composite.removeConstraint = function(composite, constraint, deep) {
var position = Common.indexOf(composite.constraints, constraint);
if (position !== -1) {
Composite.removeConstraintAt(composite, position);
}
if (deep) {
for (var i = 0; i < composite.composites.length; i++){
Composite.removeConstraint(composite.composites[i], constraint, true);
}
}
return composite;
};
/**
* Removes a body from the given composite.
* @private
* @method removeConstraintAt
* @param {composite} composite
* @param {number} position
* @return {composite} The original composite with the constraint removed
*/
Composite.removeConstraintAt = function(composite, position) {
composite.constraints.splice(position, 1);
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Removes all bodies, constraints and composites from the given composite.
* Optionally clearing its children recursively.
* @method clear
* @param {composite} composite
* @param {boolean} keepStatic
* @param {boolean} [deep=false]
*/
Composite.clear = function(composite, keepStatic, deep) {
if (deep) {
for (var i = 0; i < composite.composites.length; i++){
Composite.clear(composite.composites[i], keepStatic, true);
}
}
if (keepStatic) {
composite.bodies = composite.bodies.filter(function(body) { return body.isStatic; });
} else {
composite.bodies.length = 0;
}
composite.constraints.length = 0;
composite.composites.length = 0;
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Returns all bodies in the given composite, including all bodies in its children, recursively.
* @method allBodies
* @param {composite} composite
* @return {body[]} All the bodies
*/
Composite.allBodies = function(composite) {
var bodies = [].concat(composite.bodies);
for (var i = 0; i < composite.composites.length; i++)
bodies = bodies.concat(Composite.allBodies(composite.composites[i]));
return bodies;
};
/**
* Returns all constraints in the given composite, including all constraints in its children, recursively.
* @method allConstraints
* @param {composite} composite
* @return {constraint[]} All the constraints
*/
Composite.allConstraints = function(composite) {
var constraints = [].concat(composite.constraints);
for (var i = 0; i < composite.composites.length; i++)
constraints = constraints.concat(Composite.allConstraints(composite.composites[i]));
return constraints;
};
/**
* Returns all composites in the given composite, including all composites in its children, recursively.
* @method allComposites
* @param {composite} composite
* @return {composite[]} All the composites
*/
Composite.allComposites = function(composite) {
var composites = [].concat(composite.composites);
for (var i = 0; i < composite.composites.length; i++)
composites = composites.concat(Composite.allComposites(composite.composites[i]));
return composites;
};
/**
* Searches the composite recursively for an object matching the type and id supplied, null if not found.
* @method get
* @param {composite} composite
* @param {number} id
* @param {string} type
* @return {object} The requested object, if found
*/
Composite.get = function(composite, id, type) {
var objects,
object;
switch (type) {
case 'body':
objects = Composite.allBodies(composite);
break;
case 'constraint':
objects = Composite.allConstraints(composite);
break;
case 'composite':
objects = Composite.allComposites(composite).concat(composite);
break;
}
if (!objects)
return null;
object = objects.filter(function(object) {
return object.id.toString() === id.toString();
});
return object.length === 0 ? null : object[0];
};
/**
* Moves the given object(s) from compositeA to compositeB (equal to a remove followed by an add).
* @method move
* @param {compositeA} compositeA
* @param {object[]} objects
* @param {compositeB} compositeB
* @return {composite} Returns compositeA
*/
Composite.move = function(compositeA, objects, compositeB) {
Composite.remove(compositeA, objects);
Composite.add(compositeB, objects);
return compositeA;
};
/**
* Assigns new ids for all objects in the composite, recursively.
* @method rebase
* @param {composite} composite
* @return {composite} Returns composite
*/
Composite.rebase = function(composite) {
var objects = Composite.allBodies(composite)
.concat(Composite.allConstraints(composite))
.concat(Composite.allComposites(composite));
for (var i = 0; i < objects.length; i++) {
objects[i].id = Common.nextId();
}
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Translates all children in the composite by a given vector relative to their current positions,
* without imparting any velocity.
* @method translate
* @param {composite} composite
* @param {vector} translation
* @param {bool} [recursive=true]
*/
Composite.translate = function(composite, translation, recursive) {
var bodies = recursive ? Composite.allBodies(composite) : composite.bodies;
for (var i = 0; i < bodies.length; i++) {
Body.translate(bodies[i], translation);
}
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Rotates all children in the composite by a given angle about the given point, without imparting any angular velocity.
* @method rotate
* @param {composite} composite
* @param {number} rotation
* @param {vector} point
* @param {bool} [recursive=true]
*/
Composite.rotate = function(composite, rotation, point, recursive) {
var cos = Math.cos(rotation),
sin = Math.sin(rotation),
bodies = recursive ? Composite.allBodies(composite) : composite.bodies;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i],
dx = body.position.x - point.x,
dy = body.position.y - point.y;
Body.setPosition(body, {
x: point.x + (dx * cos - dy * sin),
y: point.y + (dx * sin + dy * cos)
});
Body.rotate(body, rotation);
}
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Scales all children in the composite, including updating physical properties (mass, area, axes, inertia), from a world-space point.
* @method scale
* @param {composite} composite
* @param {number} scaleX
* @param {number} scaleY
* @param {vector} point
* @param {bool} [recursive=true]
*/
Composite.scale = function(composite, scaleX, scaleY, point, recursive) {
var bodies = recursive ? Composite.allBodies(composite) : composite.bodies;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i],
dx = body.position.x - point.x,
dy = body.position.y - point.y;
Body.setPosition(body, {
x: point.x + dx * scaleX,
y: point.y + dy * scaleY
});
Body.scale(body, scaleX, scaleY);
}
Composite.setModified(composite, true, true, false);
return composite;
};
/**
* Returns the union of the bounds of all of the composite's bodies.
* @method bounds
* @param {composite} composite The composite.
* @returns {bounds} The composite bounds.
*/
Composite.bounds = function(composite) {
var bodies = Matter.Composite.allBodies(composite),
vertices = [];
for (var i = 0; i < bodies.length; i += 1) {
var body = bodies[i];
vertices.push(body.bounds.min, body.bounds.max);
}
return Matter.Bounds.create(vertices);
};
/*
*
* Events Documentation
*
*/
/**
* Fired when a call to `Composite.add` is made, before objects have been added.
*
* @event beforeAdd
* @param {} event An event object
* @param {} event.object The object(s) to be added (may be a single body, constraint, composite or a mixed array of these)
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when a call to `Composite.add` is made, after objects have been added.
*
* @event afterAdd
* @param {} event An event object
* @param {} event.object The object(s) that have been added (may be a single body, constraint, composite or a mixed array of these)
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when a call to `Composite.remove` is made, before objects have been removed.
*
* @event beforeRemove
* @param {} event An event object
* @param {} event.object The object(s) to be removed (may be a single body, constraint, composite or a mixed array of these)
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when a call to `Composite.remove` is made, after objects have been removed.
*
* @event afterRemove
* @param {} event An event object
* @param {} event.object The object(s) that have been removed (may be a single body, constraint, composite or a mixed array of these)
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/*
*
* Properties Documentation
*
*/
/**
* An integer `Number` uniquely identifying number generated in `Composite.create` by `Common.nextId`.
*
* @property id
* @type number
*/
/**
* A `String` denoting the type of object.
*
* @property type
* @type string
* @default "composite"
* @readOnly
*/
/**
* An arbitrary `String` name to help the user identify and manage composites.
*
* @property label
* @type string
* @default "Composite"
*/
/**
* A flag that specifies whether the composite has been modified during the current step.
* Most `Matter.Composite` methods will automatically set this flag to `true` to inform the engine of changes to be handled.
* If you need to change it manually, you should use the `Composite.setModified` method.
*
* @property isModified
* @type boolean
* @default false
*/
/**
* The `Composite` that is the parent of this composite. It is automatically managed by the `Matter.Composite` methods.
*
* @property parent
* @type composite
* @default null
*/
/**
* An array of `Body` that are _direct_ children of this composite.
* To add or remove bodies you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.
* If you wish to recursively find all descendants, you should use the `Composite.allBodies` method.
*
* @property bodies
* @type body[]
* @default []
*/
/**
* An array of `Constraint` that are _direct_ children of this composite.
* To add or remove constraints you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.
* If you wish to recursively find all descendants, you should use the `Composite.allConstraints` method.
*
* @property constraints
* @type constraint[]
* @default []
*/
/**
* An array of `Composite` that are _direct_ children of this composite.
* To add or remove composites you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.
* If you wish to recursively find all descendants, you should use the `Composite.allComposites` method.
*
* @property composites
* @type composite[]
* @default []
*/
/**
* An object reserved for storing plugin-specific properties.
*
* @property plugin
* @type {}
*/
})();
},{"../core/Common":14,"../core/Events":16,"./Body":1}],3:[function(_dereq_,module,exports){
/**
* The `Matter.World` module contains methods for creating and manipulating the world composite.
* A `Matter.World` is a `Matter.Composite` body, which is a collection of `Matter.Body`, `Matter.Constraint` and other `Matter.Composite`.
* A `Matter.World` has a few additional properties including `gravity` and `bounds`.
* It is important to use the functions in the `Matter.Composite` module to modify the world composite, rather than directly modifying its properties.
* There are also a few methods here that alias those in `Matter.Composite` for easier readability.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class World
* @extends Composite
*/
var World = {};
module.exports = World;
var Composite = _dereq_('./Composite');
var Constraint = _dereq_('../constraint/Constraint');
var Common = _dereq_('../core/Common');
(function() {
/**
* Creates a new world composite. The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @constructor
* @param {} options
* @return {world} A new world
*/
World.create = function(options) {
var composite = Composite.create();
var defaults = {
label: 'World',
gravity: {
x: 0,
y: 1,
scale: 0.001
},
bounds: {
min: { x: -Infinity, y: -Infinity },
max: { x: Infinity, y: Infinity }
}
};
return Common.extend(composite, defaults, options);
};
/*
*
* Properties Documentation
*
*/
/**
* The gravity to apply on the world.
*
* @property gravity
* @type object
*/
/**
* The gravity x component.
*
* @property gravity.x
* @type object
* @default 0
*/
/**
* The gravity y component.
*
* @property gravity.y
* @type object
* @default 1
*/
/**
* The gravity scale factor.
*
* @property gravity.scale
* @type object
* @default 0.001
*/
/**
* A `Bounds` object that defines the world bounds for collision detection.
*
* @property bounds
* @type bounds
* @default { min: { x: -Infinity, y: -Infinity }, max: { x: Infinity, y: Infinity } }
*/
// World is a Composite body
// see src/module/Outro.js for these aliases:
/**
* An alias for Composite.clear
* @method clear
* @param {world} world
* @param {boolean} keepStatic
*/
/**
* An alias for Composite.add
* @method addComposite
* @param {world} world
* @param {composite} composite
* @return {world} The original world with the objects from composite added
*/
/**
* An alias for Composite.addBody
* @method addBody
* @param {world} world
* @param {body} body
* @return {world} The original world with the body added
*/
/**
* An alias for Composite.addConstraint
* @method addConstraint
* @param {world} world
* @param {constraint} constraint
* @return {world} The original world with the constraint added
*/
})();
},{"../constraint/Constraint":12,"../core/Common":14,"./Composite":2}],4:[function(_dereq_,module,exports){
/**
* The `Matter.Contact` module contains methods for creating and manipulating collision contacts.
*
* @class Contact
*/
var Contact = {};
module.exports = Contact;
(function() {
/**
* Creates a new contact.
* @method create
* @param {vertex} vertex
* @return {contact} A new contact
*/
Contact.create = function(vertex) {
return {
id: Contact.id(vertex),
vertex: vertex,
normalImpulse: 0,
tangentImpulse: 0
};
};
/**
* Generates a contact id.
* @method id
* @param {vertex} vertex
* @return {string} Unique contactID
*/
Contact.id = function(vertex) {
return vertex.body.id + '_' + vertex.index;
};
})();
},{}],5:[function(_dereq_,module,exports){
/**
* The `Matter.Detector` module contains methods for detecting collisions given a set of pairs.
*
* @class Detector
*/
// TODO: speculative contacts
var Detector = {};
module.exports = Detector;
var SAT = _dereq_('./SAT');
var Pair = _dereq_('./Pair');
var Bounds = _dereq_('../geometry/Bounds');
(function() {
/**
* Finds all collisions given a list of pairs.
* @method collisions
* @param {pair[]} broadphasePairs
* @param {engine} engine
* @return {array} collisions
*/
Detector.collisions = function(broadphasePairs, engine) {
var collisions = [],
pairsTable = engine.pairs.table;
for (var i = 0; i < broadphasePairs.length; i++) {
var bodyA = broadphasePairs[i][0],
bodyB = broadphasePairs[i][1];
if ((bodyA.isStatic || bodyA.isSleeping) && (bodyB.isStatic || bodyB.isSleeping))
continue;
if (!Detector.canCollide(bodyA.collisionFilter, bodyB.collisionFilter))
continue;
// mid phase
if (Bounds.overlaps(bodyA.bounds, bodyB.bounds)) {
for (var j = bodyA.parts.length > 1 ? 1 : 0; j < bodyA.parts.length; j++) {
var partA = bodyA.parts[j];
for (var k = bodyB.parts.length > 1 ? 1 : 0; k < bodyB.parts.length; k++) {
var partB = bodyB.parts[k];
if ((partA === bodyA && partB === bodyB) || Bounds.overlaps(partA.bounds, partB.bounds)) {
// find a previous collision we could reuse
var pairId = Pair.id(partA, partB),
pair = pairsTable[pairId],
previousCollision;
if (pair && pair.isActive) {
previousCollision = pair.collision;
} else {
previousCollision = null;
}
// narrow phase
var collision = SAT.collides(partA, partB, previousCollision);
if (collision.collided) {
collisions.push(collision);
}
}
}
}
}
}
return collisions;
};
/**
* Returns `true` if both supplied collision filters will allow a collision to occur.
* See `body.collisionFilter` for more information.
* @method canCollide
* @param {} filterA
* @param {} filterB
* @return {bool} `true` if collision can occur
*/
Detector.canCollide = function(filterA, filterB) {
if (filterA.group === filterB.group && filterA.group !== 0)
return filterA.group > 0;
return (filterA.mask & filterB.category) !== 0 && (filterB.mask & filterA.category) !== 0;
};
})();
},{"../geometry/Bounds":26,"./Pair":7,"./SAT":11}],6:[function(_dereq_,module,exports){
/**
* The `Matter.Grid` module contains methods for creating and manipulating collision broadphase grid structures.
*
* @class Grid
*/
var Grid = {};
module.exports = Grid;
var Pair = _dereq_('./Pair');
var Detector = _dereq_('./Detector');
var Common = _dereq_('../core/Common');
(function() {
/**
* Creates a new grid.
* @method create
* @param {} options
* @return {grid} A new grid
*/
Grid.create = function(options) {
var defaults = {
controller: Grid,
detector: Detector.collisions,
buckets: {},
pairs: {},
pairsList: [],
bucketWidth: 48,
bucketHeight: 48
};
return Common.extend(defaults, options);
};
/**
* The width of a single grid bucket.
*
* @property bucketWidth
* @type number
* @default 48
*/
/**
* The height of a single grid bucket.
*
* @property bucketHeight
* @type number
* @default 48
*/
/**
* Updates the grid.
* @method update
* @param {grid} grid
* @param {body[]} bodies
* @param {engine} engine
* @param {boolean} forceUpdate
*/
Grid.update = function(grid, bodies, engine, forceUpdate) {
var i, col, row,
world = engine.world,
buckets = grid.buckets,
bucket,
bucketId,
gridChanged = false;
for (i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (body.isSleeping && !forceUpdate)
continue;
// don't update out of world bodies
if (body.bounds.max.x < world.bounds.min.x || body.bounds.min.x > world.bounds.max.x
|| body.bounds.max.y < world.bounds.min.y || body.bounds.min.y > world.bounds.max.y)
continue;
var newRegion = _getRegion(grid, body);
// if the body has changed grid region
if (!body.region || newRegion.id !== body.region.id || forceUpdate) {
if (!body.region || forceUpdate)
body.region = newRegion;
var union = _regionUnion(newRegion, body.region);
// update grid buckets affected by region change
// iterate over the union of both regions
for (col = union.startCol; col <= union.endCol; col++) {
for (row = union.startRow; row <= union.endRow; row++) {
bucketId = _getBucketId(col, row);
bucket = buckets[bucketId];
var isInsideNewRegion = (col >= newRegion.startCol && col <= newRegion.endCol
&& row >= newRegion.startRow && row <= newRegion.endRow);
var isInsideOldRegion = (col >= body.region.startCol && col <= body.region.endCol
&& row >= body.region.startRow && row <= body.region.endRow);
// remove from old region buckets
if (!isInsideNewRegion && isInsideOldRegion) {
if (isInsideOldRegion) {
if (bucket)
_bucketRemoveBody(grid, bucket, body);
}
}
// add to new region buckets
if (body.region === newRegion || (isInsideNewRegion && !isInsideOldRegion) || forceUpdate) {
if (!bucket)
bucket = _createBucket(buckets, bucketId);
_bucketAddBody(grid, bucket, body);
}
}
}
// set the new region
body.region = newRegion;
// flag changes so we can update pairs
gridChanged = true;
}
}
// update pairs list only if pairs changed (i.e. a body changed region)
if (gridChanged)
grid.pairsList = _createActivePairsList(grid);
};
/**
* Clears the grid.
* @method clear
* @param {grid} grid
*/
Grid.clear = function(grid) {
grid.buckets = {};
grid.pairs = {};
grid.pairsList = [];
};
/**
* Finds the union of two regions.
* @method _regionUnion
* @private
* @param {} regionA
* @param {} regionB
* @return {} region
*/
var _regionUnion = function(regionA, regionB) {
var startCol = Math.min(regionA.startCol, regionB.startCol),
endCol = Math.max(regionA.endCol, regionB.endCol),
startRow = Math.min(regionA.startRow, regionB.startRow),
endRow = Math.max(regionA.endRow, regionB.endRow);
return _createRegion(startCol, endCol, startRow, endRow);
};
/**
* Gets the region a given body falls in for a given grid.
* @method _getRegion
* @private
* @param {} grid
* @param {} body
* @return {} region
*/
var _getRegion = function(grid, body) {
var bounds = body.bounds,
startCol = Math.floor(bounds.min.x / grid.bucketWidth),
endCol = Math.floor(bounds.max.x / grid.bucketWidth),
startRow = Math.floor(bounds.min.y / grid.bucketHeight),
endRow = Math.floor(bounds.max.y / grid.bucketHeight);
return _createRegion(startCol, endCol, startRow, endRow);
};
/**
* Creates a region.
* @method _createRegion
* @private
* @param {} startCol
* @param {} endCol
* @param {} startRow
* @param {} endRow
* @return {} region
*/
var _createRegion = function(startCol, endCol, startRow, endRow) {
return {
id: startCol + ',' + endCol + ',' + startRow + ',' + endRow,
startCol: startCol,
endCol: endCol,
startRow: startRow,
endRow: endRow
};
};
/**
* Gets the bucket id at the given position.
* @method _getBucketId
* @private
* @param {} column
* @param {} row
* @return {string} bucket id
*/
var _getBucketId = function(column, row) {
return 'C' + column + 'R' + row;
};
/**
* Creates a bucket.
* @method _createBucket
* @private
* @param {} buckets
* @param {} bucketId
* @return {} bucket
*/
var _createBucket = function(buckets, bucketId) {
var bucket = buckets[bucketId] = [];
return bucket;
};
/**
* Adds a body to a bucket.
* @method _bucketAddBody
* @private
* @param {} grid
* @param {} bucket
* @param {} body
*/
var _bucketAddBody = function(grid, bucket, body) {
// add new pairs
for (var i = 0; i < bucket.length; i++) {
var bodyB = bucket[i];
if (body.id === bodyB.id || (body.isStatic && bodyB.isStatic))
continue;
// keep track of the number of buckets the pair exists in
// important for Grid.update to work
var pairId = Pair.id(body, bodyB),
pair = grid.pairs[pairId];
if (pair) {
pair[2] += 1;
} else {
grid.pairs[pairId] = [body, bodyB, 1];
}
}
// add to bodies (after pairs, otherwise pairs with self)
bucket.push(body);
};
/**
* Removes a body from a bucket.
* @method _bucketRemoveBody
* @private
* @param {} grid
* @param {} bucket
* @param {} body
*/
var _bucketRemoveBody = function(grid, bucket, body) {
// remove from bucket
bucket.splice(Common.indexOf(bucket, body), 1);
// update pair counts
for (var i = 0; i < bucket.length; i++) {
// keep track of the number of buckets the pair exists in
// important for _createActivePairsList to work
var bodyB = bucket[i],
pairId = Pair.id(body, bodyB),
pair = grid.pairs[pairId];
if (pair)
pair[2] -= 1;
}
};
/**
* Generates a list of the active pairs in the grid.
* @method _createActivePairsList
* @private
* @param {} grid
* @return [] pairs
*/
var _createActivePairsList = function(grid) {
var pairKeys,
pair,
pairs = [];
// grid.pairs is used as a hashmap
pairKeys = Common.keys(grid.pairs);
// iterate over grid.pairs
for (var k = 0; k < pairKeys.length; k++) {
pair = grid.pairs[pairKeys[k]];
// if pair exists in at least one bucket
// it is a pair that needs further collision testing so push it
if (pair[2] > 0) {
pairs.push(pair);
} else {
delete grid.pairs[pairKeys[k]];
}
}
return pairs;
};
})();
},{"../core/Common":14,"./Detector":5,"./Pair":7}],7:[function(_dereq_,module,exports){
/**
* The `Matter.Pair` module contains methods for creating and manipulating collision pairs.
*
* @class Pair
*/
var Pair = {};
module.exports = Pair;
var Contact = _dereq_('./Contact');
(function() {
/**
* Creates a pair.
* @method create
* @param {collision} collision
* @param {number} timestamp
* @return {pair} A new pair
*/
Pair.create = function(collision, timestamp) {
var bodyA = collision.bodyA,
bodyB = collision.bodyB,
parentA = collision.parentA,
parentB = collision.parentB;
var pair = {
id: Pair.id(bodyA, bodyB),
bodyA: bodyA,
bodyB: bodyB,
contacts: {},
activeContacts: [],
separation: 0,
isActive: true,
isSensor: bodyA.isSensor || bodyB.isSensor,
timeCreated: timestamp,
timeUpdated: timestamp,
inverseMass: parentA.inverseMass + parentB.inverseMass,
friction: Math.min(parentA.friction, parentB.friction),
frictionStatic: Math.max(parentA.frictionStatic, parentB.frictionStatic),
restitution: Math.max(parentA.restitution, parentB.restitution),
slop: Math.max(parentA.slop, parentB.slop)
};
Pair.update(pair, collision, timestamp);
return pair;
};
/**
* Updates a pair given a collision.
* @method update
* @param {pair} pair
* @param {collision} collision
* @param {number} timestamp
*/
Pair.update = function(pair, collision, timestamp) {
var contacts = pair.contacts,
supports = collision.supports,
activeContacts = pair.activeContacts,
parentA = collision.parentA,
parentB = collision.parentB;
pair.collision = collision;
pair.inverseMass = parentA.inverseMass + parentB.inverseMass;
pair.friction = Math.min(parentA.friction, parentB.friction);
pair.frictionStatic = Math.max(parentA.frictionStatic, parentB.frictionStatic);
pair.restitution = Math.max(parentA.restitution, parentB.restitution);
pair.slop = Math.max(parentA.slop, parentB.slop);
activeContacts.length = 0;
if (collision.collided) {
for (var i = 0; i < supports.length; i++) {
var support = supports[i],
contactId = Contact.id(support),
contact = contacts[contactId];
if (contact) {
activeContacts.push(contact);
} else {
activeContacts.push(contacts[contactId] = Contact.create(support));
}
}
pair.separation = collision.depth;
Pair.setActive(pair, true, timestamp);
} else {
if (pair.isActive === true)
Pair.setActive(pair, false, timestamp);
}
};
/**
* Set a pair as active or inactive.
* @method setActive
* @param {pair} pair
* @param {bool} isActive
* @param {number} timestamp
*/
Pair.setActive = function(pair, isActive, timestamp) {
if (isActive) {
pair.isActive = true;
pair.timeUpdated = timestamp;
} else {
pair.isActive = false;
pair.activeContacts.length = 0;
}
};
/**
* Get the id for the given pair.
* @method id
* @param {body} bodyA
* @param {body} bodyB
* @return {string} Unique pairId
*/
Pair.id = function(bodyA, bodyB) {
if (bodyA.id < bodyB.id) {
return 'A' + bodyA.id + 'B' + bodyB.id;
} else {
return 'A' + bodyB.id + 'B' + bodyA.id;
}
};
})();
},{"./Contact":4}],8:[function(_dereq_,module,exports){
/**
* The `Matter.Pairs` module contains methods for creating and manipulating collision pair sets.
*
* @class Pairs
*/
var Pairs = {};
module.exports = Pairs;
var Pair = _dereq_('./Pair');
var Common = _dereq_('../core/Common');
(function() {
var _pairMaxIdleLife = 1000;
/**
* Creates a new pairs structure.
* @method create
* @param {object} options
* @return {pairs} A new pairs structure
*/
Pairs.create = function(options) {
return Common.extend({
table: {},
list: [],
collisionStart: [],
collisionActive: [],
collisionEnd: []
}, options);
};
/**
* Updates pairs given a list of collisions.
* @method update
* @param {object} pairs
* @param {collision[]} collisions
* @param {number} timestamp
*/
Pairs.update = function(pairs, collisions, timestamp) {
var pairsList = pairs.list,
pairsTable = pairs.table,
collisionStart = pairs.collisionStart,
collisionEnd = pairs.collisionEnd,
collisionActive = pairs.collisionActive,
activePairIds = [],
collision,
pairId,
pair,
i;
// clear collision state arrays, but maintain old reference
collisionStart.length = 0;
collisionEnd.length = 0;
collisionActive.length = 0;
for (i = 0; i < collisions.length; i++) {
collision = collisions[i];
if (collision.collided) {
pairId = Pair.id(collision.bodyA, collision.bodyB);
activePairIds.push(pairId);
pair = pairsTable[pairId];
if (pair) {
// pair already exists (but may or may not be active)
if (pair.isActive) {
// pair exists and is active
collisionActive.push(pair);
} else {
// pair exists but was inactive, so a collision has just started again
collisionStart.push(pair);
}
// update the pair
Pair.update(pair, collision, timestamp);
} else {
// pair did not exist, create a new pair
pair = Pair.create(collision, timestamp);
pairsTable[pairId] = pair;
// push the new pair
collisionStart.push(pair);
pairsList.push(pair);
}
}
}
// deactivate previously active pairs that are now inactive
for (i = 0; i < pairsList.length; i++) {
pair = pairsList[i];
if (pair.isActive && Common.indexOf(activePairIds, pair.id) === -1) {
Pair.setActive(pair, false, timestamp);
collisionEnd.push(pair);
}
}
};
/**
* Finds and removes pairs that have been inactive for a set amount of time.
* @method removeOld
* @param {object} pairs
* @param {number} timestamp
*/
Pairs.removeOld = function(pairs, timestamp) {
var pairsList = pairs.list,
pairsTable = pairs.table,
indexesToRemove = [],
pair,
collision,
pairIndex,
i;
for (i = 0; i < pairsList.length; i++) {
pair = pairsList[i];
collision = pair.collision;
// never remove sleeping pairs
if (collision.bodyA.isSleeping || collision.bodyB.isSleeping) {
pair.timeUpdated = timestamp;
continue;
}
// if pair is inactive for too long, mark it to be removed
if (timestamp - pair.timeUpdated > _pairMaxIdleLife) {
indexesToRemove.push(i);
}
}
// remove marked pairs
for (i = 0; i < indexesToRemove.length; i++) {
pairIndex = indexesToRemove[i] - i;
pair = pairsList[pairIndex];
delete pairsTable[pair.id];
pairsList.splice(pairIndex, 1);
}
};
/**
* Clears the given pairs structure.
* @method clear
* @param {pairs} pairs
* @return {pairs} pairs
*/
Pairs.clear = function(pairs) {
pairs.table = {};
pairs.list.length = 0;
pairs.collisionStart.length = 0;
pairs.collisionActive.length = 0;
pairs.collisionEnd.length = 0;
return pairs;
};
})();
},{"../core/Common":14,"./Pair":7}],9:[function(_dereq_,module,exports){
/**
* The `Matter.Query` module contains methods for performing collision queries.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Query
*/
var Query = {};
module.exports = Query;
var Vector = _dereq_('../geometry/Vector');
var SAT = _dereq_('./SAT');
var Bounds = _dereq_('../geometry/Bounds');
var Bodies = _dereq_('../factory/Bodies');
var Vertices = _dereq_('../geometry/Vertices');
(function() {
/**
* Casts a ray segment against a set of bodies and returns all collisions, ray width is optional. Intersection points are not provided.
* @method ray
* @param {body[]} bodies
* @param {vector} startPoint
* @param {vector} endPoint
* @param {number} [rayWidth]
* @return {object[]} Collisions
*/
Query.ray = function(bodies, startPoint, endPoint, rayWidth) {
rayWidth = rayWidth || 1e-100;
var rayAngle = Vector.angle(startPoint, endPoint),
rayLength = Vector.magnitude(Vector.sub(startPoint, endPoint)),
rayX = (endPoint.x + startPoint.x) * 0.5,
rayY = (endPoint.y + startPoint.y) * 0.5,
ray = Bodies.rectangle(rayX, rayY, rayLength, rayWidth, { angle: rayAngle }),
collisions = [];
for (var i = 0; i < bodies.length; i++) {
var bodyA = bodies[i];
if (Bounds.overlaps(bodyA.bounds, ray.bounds)) {
for (var j = bodyA.parts.length === 1 ? 0 : 1; j < bodyA.parts.length; j++) {
var part = bodyA.parts[j];
if (Bounds.overlaps(part.bounds, ray.bounds)) {
var collision = SAT.collides(part, ray);
if (collision.collided) {
collision.body = collision.bodyA = collision.bodyB = bodyA;
collisions.push(collision);
break;
}
}
}
}
}
return collisions;
};
/**
* Returns all bodies whose bounds are inside (or outside if set) the given set of bounds, from the given set of bodies.
* @method region
* @param {body[]} bodies
* @param {bounds} bounds
* @param {bool} [outside=false]
* @return {body[]} The bodies matching the query
*/
Query.region = function(bodies, bounds, outside) {
var result = [];
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i],
overlaps = Bounds.overlaps(body.bounds, bounds);
if ((overlaps && !outside) || (!overlaps && outside))
result.push(body);
}
return result;
};
/**
* Returns all bodies whose vertices contain the given point, from the given set of bodies.
* @method point
* @param {body[]} bodies
* @param {vector} point
* @return {body[]} The bodies matching the query
*/
Query.point = function(bodies, point) {
var result = [];
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (Bounds.contains(body.bounds, point)) {
for (var j = body.parts.length === 1 ? 0 : 1; j < body.parts.length; j++) {
var part = body.parts[j];
if (Bounds.contains(part.bounds, point)
&& Vertices.contains(part.vertices, point)) {
result.push(body);
break;
}
}
}
}
return result;
};
})();
},{"../factory/Bodies":23,"../geometry/Bounds":26,"../geometry/Vector":28,"../geometry/Vertices":29,"./SAT":11}],10:[function(_dereq_,module,exports){
/**
* The `Matter.Resolver` module contains methods for resolving collision pairs.
*
* @class Resolver
*/
var Resolver = {};
module.exports = Resolver;
var Vertices = _dereq_('../geometry/Vertices');
var Vector = _dereq_('../geometry/Vector');
var Common = _dereq_('../core/Common');
var Bounds = _dereq_('../geometry/Bounds');
(function() {
Resolver._restingThresh = 4;
Resolver._restingThreshTangent = 6;
Resolver._positionDampen = 0.9;
Resolver._positionWarming = 0.8;
Resolver._frictionNormalMultiplier = 5;
/**
* Prepare pairs for position solving.
* @method preSolvePosition
* @param {pair[]} pairs
*/
Resolver.preSolvePosition = function(pairs) {
var i,
pair,
activeCount;
// find total contacts on each body
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive)
continue;
activeCount = pair.activeContacts.length;
pair.collision.parentA.totalContacts += activeCount;
pair.collision.parentB.totalContacts += activeCount;
}
};
/**
* Find a solution for pair positions.
* @method solvePosition
* @param {pair[]} pairs
* @param {number} timeScale
*/
Resolver.solvePosition = function(pairs, timeScale) {
var i,
pair,
collision,
bodyA,
bodyB,
normal,
bodyBtoA,
contactShare,
positionImpulse,
contactCount = {},
tempA = Vector._temp[0],
tempB = Vector._temp[1],
tempC = Vector._temp[2],
tempD = Vector._temp[3];
// find impulses required to resolve penetration
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive || pair.isSensor)
continue;
collision = pair.collision;
bodyA = collision.parentA;
bodyB = collision.parentB;
normal = collision.normal;
// get current separation between body edges involved in collision
bodyBtoA = Vector.sub(Vector.add(bodyB.positionImpulse, bodyB.position, tempA),
Vector.add(bodyA.positionImpulse,
Vector.sub(bodyB.position, collision.penetration, tempB), tempC), tempD);
pair.separation = Vector.dot(normal, bodyBtoA);
}
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive || pair.isSensor)
continue;
collision = pair.collision;
bodyA = collision.parentA;
bodyB = collision.parentB;
normal = collision.normal;
positionImpulse = (pair.separation - pair.slop) * timeScale;
if (bodyA.isStatic || bodyB.isStatic)
positionImpulse *= 2;
if (!(bodyA.isStatic || bodyA.isSleeping)) {
contactShare = Resolver._positionDampen / bodyA.totalContacts;
bodyA.positionImpulse.x += normal.x * positionImpulse * contactShare;
bodyA.positionImpulse.y += normal.y * positionImpulse * contactShare;
}
if (!(bodyB.isStatic || bodyB.isSleeping)) {
contactShare = Resolver._positionDampen / bodyB.totalContacts;
bodyB.positionImpulse.x -= normal.x * positionImpulse * contactShare;
bodyB.positionImpulse.y -= normal.y * positionImpulse * contactShare;
}
}
};
/**
* Apply position resolution.
* @method postSolvePosition
* @param {body[]} bodies
*/
Resolver.postSolvePosition = function(bodies) {
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
// reset contact count
body.totalContacts = 0;
if (body.positionImpulse.x !== 0 || body.positionImpulse.y !== 0) {
// update body geometry
for (var j = 0; j < body.parts.length; j++) {
var part = body.parts[j];
Vertices.translate(part.vertices, body.positionImpulse);
Bounds.update(part.bounds, part.vertices, body.velocity);
part.position.x += body.positionImpulse.x;
part.position.y += body.positionImpulse.y;
}
// move the body without changing velocity
body.positionPrev.x += body.positionImpulse.x;
body.positionPrev.y += body.positionImpulse.y;
if (Vector.dot(body.positionImpulse, body.velocity) < 0) {
// reset cached impulse if the body has velocity along it
body.positionImpulse.x = 0;
body.positionImpulse.y = 0;
} else {
// warm the next iteration
body.positionImpulse.x *= Resolver._positionWarming;
body.positionImpulse.y *= Resolver._positionWarming;
}
}
}
};
/**
* Prepare pairs for velocity solving.
* @method preSolveVelocity
* @param {pair[]} pairs
*/
Resolver.preSolveVelocity = function(pairs) {
var i,
j,
pair,
contacts,
collision,
bodyA,
bodyB,
normal,
tangent,
contact,
contactVertex,
normalImpulse,
tangentImpulse,
offset,
impulse = Vector._temp[0],
tempA = Vector._temp[1];
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive || pair.isSensor)
continue;
contacts = pair.activeContacts;
collision = pair.collision;
bodyA = collision.parentA;
bodyB = collision.parentB;
normal = collision.normal;
tangent = collision.tangent;
// resolve each contact
for (j = 0; j < contacts.length; j++) {
contact = contacts[j];
contactVertex = contact.vertex;
normalImpulse = contact.normalImpulse;
tangentImpulse = contact.tangentImpulse;
if (normalImpulse !== 0 || tangentImpulse !== 0) {
// total impulse from contact
impulse.x = (normal.x * normalImpulse) + (tangent.x * tangentImpulse);
impulse.y = (normal.y * normalImpulse) + (tangent.y * tangentImpulse);
// apply impulse from contact
if (!(bodyA.isStatic || bodyA.isSleeping)) {
offset = Vector.sub(contactVertex, bodyA.position, tempA);
bodyA.positionPrev.x += impulse.x * bodyA.inverseMass;
bodyA.positionPrev.y += impulse.y * bodyA.inverseMass;
bodyA.anglePrev += Vector.cross(offset, impulse) * bodyA.inverseInertia;
}
if (!(bodyB.isStatic || bodyB.isSleeping)) {
offset = Vector.sub(contactVertex, bodyB.position, tempA);
bodyB.positionPrev.x -= impulse.x * bodyB.inverseMass;
bodyB.positionPrev.y -= impulse.y * bodyB.inverseMass;
bodyB.anglePrev -= Vector.cross(offset, impulse) * bodyB.inverseInertia;
}
}
}
}
};
/**
* Find a solution for pair velocities.
* @method solveVelocity
* @param {pair[]} pairs
* @param {number} timeScale
*/
Resolver.solveVelocity = function(pairs, timeScale) {
var timeScaleSquared = timeScale * timeScale,
impulse = Vector._temp[0],
tempA = Vector._temp[1],
tempB = Vector._temp[2],
tempC = Vector._temp[3],
tempD = Vector._temp[4],
tempE = Vector._temp[5];
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i];
if (!pair.isActive || pair.isSensor)
continue;
var collision = pair.collision,
bodyA = collision.parentA,
bodyB = collision.parentB,
normal = collision.normal,
tangent = collision.tangent,
contacts = pair.activeContacts,
contactShare = 1 / contacts.length;
// update body velocities
bodyA.velocity.x = bodyA.position.x - bodyA.positionPrev.x;
bodyA.velocity.y = bodyA.position.y - bodyA.positionPrev.y;
bodyB.velocity.x = bodyB.position.x - bodyB.positionPrev.x;
bodyB.velocity.y = bodyB.position.y - bodyB.positionPrev.y;
bodyA.angularVelocity = bodyA.angle - bodyA.anglePrev;
bodyB.angularVelocity = bodyB.angle - bodyB.anglePrev;
// resolve each contact
for (var j = 0; j < contacts.length; j++) {
var contact = contacts[j],
contactVertex = contact.vertex,
offsetA = Vector.sub(contactVertex, bodyA.position, tempA),
offsetB = Vector.sub(contactVertex, bodyB.position, tempB),
velocityPointA = Vector.add(bodyA.velocity, Vector.mult(Vector.perp(offsetA), bodyA.angularVelocity), tempC),
velocityPointB = Vector.add(bodyB.velocity, Vector.mult(Vector.perp(offsetB), bodyB.angularVelocity), tempD),
relativeVelocity = Vector.sub(velocityPointA, velocityPointB, tempE),
normalVelocity = Vector.dot(normal, relativeVelocity);
var tangentVelocity = Vector.dot(tangent, relativeVelocity),
tangentSpeed = Math.abs(tangentVelocity),
tangentVelocityDirection = Common.sign(tangentVelocity);
// raw impulses
var normalImpulse = (1 + pair.restitution) * normalVelocity,
normalForce = Common.clamp(pair.separation + normalVelocity, 0, 1) * Resolver._frictionNormalMultiplier;
// coulomb friction
var tangentImpulse = tangentVelocity,
maxFriction = Infinity;
if (tangentSpeed > pair.friction * pair.frictionStatic * normalForce * timeScaleSquared) {
maxFriction = tangentSpeed;
tangentImpulse = Common.clamp(
pair.friction * tangentVelocityDirection * timeScaleSquared,
-maxFriction, maxFriction
);
}
// modify impulses accounting for mass, inertia and offset
var oAcN = Vector.cross(offsetA, normal),
oBcN = Vector.cross(offsetB, normal),
share = contactShare / (bodyA.inverseMass + bodyB.inverseMass + bodyA.inverseInertia * oAcN * oAcN + bodyB.inverseInertia * oBcN * oBcN);
normalImpulse *= share;
tangentImpulse *= share;
// handle high velocity and resting collisions separately
if (normalVelocity < 0 && normalVelocity * normalVelocity > Resolver._restingThresh * timeScaleSquared) {
// high normal velocity so clear cached contact normal impulse
contact.normalImpulse = 0;
} else {
// solve resting collision constraints using Erin Catto's method (GDC08)
// impulse constraint tends to 0
var contactNormalImpulse = contact.normalImpulse;
contact.normalImpulse = Math.min(contact.normalImpulse + normalImpulse, 0);
normalImpulse = contact.normalImpulse - contactNormalImpulse;
}
// handle high velocity and resting collisions separately
if (tangentVelocity * tangentVelocity > Resolver._restingThreshTangent * timeScaleSquared) {
// high tangent velocity so clear cached contact tangent impulse
contact.tangentImpulse = 0;
} else {
// solve resting collision constraints using Erin Catto's method (GDC08)
// tangent impulse tends to -tangentSpeed or +tangentSpeed
var contactTangentImpulse = contact.tangentImpulse;
contact.tangentImpulse = Common.clamp(contact.tangentImpulse + tangentImpulse, -maxFriction, maxFriction);
tangentImpulse = contact.tangentImpulse - contactTangentImpulse;
}
// total impulse from contact
impulse.x = (normal.x * normalImpulse) + (tangent.x * tangentImpulse);
impulse.y = (normal.y * normalImpulse) + (tangent.y * tangentImpulse);
// apply impulse from contact
if (!(bodyA.isStatic || bodyA.isSleeping)) {
bodyA.positionPrev.x += impulse.x * bodyA.inverseMass;
bodyA.positionPrev.y += impulse.y * bodyA.inverseMass;
bodyA.anglePrev += Vector.cross(offsetA, impulse) * bodyA.inverseInertia;
}
if (!(bodyB.isStatic || bodyB.isSleeping)) {
bodyB.positionPrev.x -= impulse.x * bodyB.inverseMass;
bodyB.positionPrev.y -= impulse.y * bodyB.inverseMass;
bodyB.anglePrev -= Vector.cross(offsetB, impulse) * bodyB.inverseInertia;
}
}
}
};
})();
},{"../core/Common":14,"../geometry/Bounds":26,"../geometry/Vector":28,"../geometry/Vertices":29}],11:[function(_dereq_,module,exports){
/**
* The `Matter.SAT` module contains methods for detecting collisions using the Separating Axis Theorem.
*
* @class SAT
*/
// TODO: true circles and curves
var SAT = {};
module.exports = SAT;
var Vertices = _dereq_('../geometry/Vertices');
var Vector = _dereq_('../geometry/Vector');
(function() {
/**
* Detect collision between two bodies using the Separating Axis Theorem.
* @method collides
* @param {body} bodyA
* @param {body} bodyB
* @param {collision} previousCollision
* @return {collision} collision
*/
SAT.collides = function(bodyA, bodyB, previousCollision) {
var overlapAB,
overlapBA,
minOverlap,
collision,
canReusePrevCol = false;
if (previousCollision) {
// estimate total motion
var parentA = bodyA.parent,
parentB = bodyB.parent,
motion = parentA.speed * parentA.speed + parentA.angularSpeed * parentA.angularSpeed
+ parentB.speed * parentB.speed + parentB.angularSpeed * parentB.angularSpeed;
// we may be able to (partially) reuse collision result
// but only safe if collision was resting
canReusePrevCol = previousCollision && previousCollision.collided && motion < 0.2;
// reuse collision object
collision = previousCollision;
} else {
collision = { collided: false, bodyA: bodyA, bodyB: bodyB };
}
if (previousCollision && canReusePrevCol) {
// if we can reuse the collision result
// we only need to test the previously found axis
var axisBodyA = collision.axisBody,
axisBodyB = axisBodyA === bodyA ? bodyB : bodyA,
axes = [axisBodyA.axes[previousCollision.axisNumber]];
minOverlap = _overlapAxes(axisBodyA.vertices, axisBodyB.vertices, axes);
collision.reused = true;
if (minOverlap.overlap <= 0) {
collision.collided = false;
return collision;
}
} else {
// if we can't reuse a result, perform a full SAT test
overlapAB = _overlapAxes(bodyA.vertices, bodyB.vertices, bodyA.axes);
if (overlapAB.overlap <= 0) {
collision.collided = false;
return collision;
}
overlapBA = _overlapAxes(bodyB.vertices, bodyA.vertices, bodyB.axes);
if (overlapBA.overlap <= 0) {
collision.collided = false;
return collision;
}
if (overlapAB.overlap < overlapBA.overlap) {
minOverlap = overlapAB;
collision.axisBody = bodyA;
} else {
minOverlap = overlapBA;
collision.axisBody = bodyB;
}
// important for reuse later
collision.axisNumber = minOverlap.axisNumber;
}
collision.bodyA = bodyA.id < bodyB.id ? bodyA : bodyB;
collision.bodyB = bodyA.id < bodyB.id ? bodyB : bodyA;
collision.collided = true;
collision.depth = minOverlap.overlap;
collision.parentA = collision.bodyA.parent;
collision.parentB = collision.bodyB.parent;
bodyA = collision.bodyA;
bodyB = collision.bodyB;
// ensure normal is facing away from bodyA
if (Vector.dot(minOverlap.axis, Vector.sub(bodyB.position, bodyA.position)) < 0) {
collision.normal = {
x: minOverlap.axis.x,
y: minOverlap.axis.y
};
} else {
collision.normal = {
x: -minOverlap.axis.x,
y: -minOverlap.axis.y
};
}
collision.tangent = Vector.perp(collision.normal);
collision.penetration = collision.penetration || {};
collision.penetration.x = collision.normal.x * collision.depth;
collision.penetration.y = collision.normal.y * collision.depth;
// find support points, there is always either exactly one or two
var verticesB = _findSupports(bodyA, bodyB, collision.normal),
supports = [];
// find the supports from bodyB that are inside bodyA
if (Vertices.contains(bodyA.vertices, verticesB[0]))
supports.push(verticesB[0]);
if (Vertices.contains(bodyA.vertices, verticesB[1]))
supports.push(verticesB[1]);
// find the supports from bodyA that are inside bodyB
if (supports.length < 2) {
var verticesA = _findSupports(bodyB, bodyA, Vector.neg(collision.normal));
if (Vertices.contains(bodyB.vertices, verticesA[0]))
supports.push(verticesA[0]);
if (supports.length < 2 && Vertices.contains(bodyB.vertices, verticesA[1]))
supports.push(verticesA[1]);
}
// account for the edge case of overlapping but no vertex containment
if (supports.length < 1)
supports = [verticesB[0]];
collision.supports = supports;
return collision;
};
/**
* Find the overlap between two sets of vertices.
* @method _overlapAxes
* @private
* @param {} verticesA
* @param {} verticesB
* @param {} axes
* @return result
*/
var _overlapAxes = function(verticesA, verticesB, axes) {
var projectionA = Vector._temp[0],
projectionB = Vector._temp[1],
result = { overlap: Number.MAX_VALUE },
overlap,
axis;
for (var i = 0; i < axes.length; i++) {
axis = axes[i];
_projectToAxis(projectionA, verticesA, axis);
_projectToAxis(projectionB, verticesB, axis);
overlap = Math.min(projectionA.max - projectionB.min, projectionB.max - projectionA.min);
if (overlap <= 0) {
result.overlap = overlap;
return result;
}
if (overlap < result.overlap) {
result.overlap = overlap;
result.axis = axis;
result.axisNumber = i;
}
}
return result;
};
/**
* Projects vertices on an axis and returns an interval.
* @method _projectToAxis
* @private
* @param {} projection
* @param {} vertices
* @param {} axis
*/
var _projectToAxis = function(projection, vertices, axis) {
var min = Vector.dot(vertices[0], axis),
max = min;
for (var i = 1; i < vertices.length; i += 1) {
var dot = Vector.dot(vertices[i], axis);
if (dot > max) {
max = dot;
} else if (dot < min) {
min = dot;
}
}
projection.min = min;
projection.max = max;
};
/**
* Finds supporting vertices given two bodies along a given direction using hill-climbing.
* @method _findSupports
* @private
* @param {} bodyA
* @param {} bodyB
* @param {} normal
* @return [vector]
*/
var _findSupports = function(bodyA, bodyB, normal) {
var nearestDistance = Number.MAX_VALUE,
vertexToBody = Vector._temp[0],
vertices = bodyB.vertices,
bodyAPosition = bodyA.position,
distance,
vertex,
vertexA,
vertexB;
// find closest vertex on bodyB
for (var i = 0; i < vertices.length; i++) {
vertex = vertices[i];
vertexToBody.x = vertex.x - bodyAPosition.x;
vertexToBody.y = vertex.y - bodyAPosition.y;
distance = -Vector.dot(normal, vertexToBody);
if (distance < nearestDistance) {
nearestDistance = distance;
vertexA = vertex;
}
}
// find next closest vertex using the two connected to it
var prevIndex = vertexA.index - 1 >= 0 ? vertexA.index - 1 : vertices.length - 1;
vertex = vertices[prevIndex];
vertexToBody.x = vertex.x - bodyAPosition.x;
vertexToBody.y = vertex.y - bodyAPosition.y;
nearestDistance = -Vector.dot(normal, vertexToBody);
vertexB = vertex;
var nextIndex = (vertexA.index + 1) % vertices.length;
vertex = vertices[nextIndex];
vertexToBody.x = vertex.x - bodyAPosition.x;
vertexToBody.y = vertex.y - bodyAPosition.y;
distance = -Vector.dot(normal, vertexToBody);
if (distance < nearestDistance) {
vertexB = vertex;
}
return [vertexA, vertexB];
};
})();
},{"../geometry/Vector":28,"../geometry/Vertices":29}],12:[function(_dereq_,module,exports){
/**
* The `Matter.Constraint` module contains methods for creating and manipulating constraints.
* Constraints are used for specifying that a fixed distance must be maintained between two bodies (or a body and a fixed world-space position).
* The stiffness of constraints can be modified to create springs or elastic.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Constraint
*/
var Constraint = {};
module.exports = Constraint;
var Vertices = _dereq_('../geometry/Vertices');
var Vector = _dereq_('../geometry/Vector');
var Sleeping = _dereq_('../core/Sleeping');
var Bounds = _dereq_('../geometry/Bounds');
var Axes = _dereq_('../geometry/Axes');
var Common = _dereq_('../core/Common');
(function() {
Constraint._warming = 0.4;
Constraint._torqueDampen = 1;
Constraint._minLength = 0.000001;
/**
* Creates a new constraint.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* To simulate a revolute constraint (or pin joint) set `length: 0` and a high `stiffness` value (e.g. `0.7` or above).
* If the constraint is unstable, try lowering the `stiffness` value and / or increasing `engine.constraintIterations`.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {} options
* @return {constraint} constraint
*/
Constraint.create = function(options) {
var constraint = options;
// if bodies defined but no points, use body centre
if (constraint.bodyA && !constraint.pointA)
constraint.pointA = { x: 0, y: 0 };
if (constraint.bodyB && !constraint.pointB)
constraint.pointB = { x: 0, y: 0 };
// calculate static length using initial world space points
var initialPointA = constraint.bodyA ? Vector.add(constraint.bodyA.position, constraint.pointA) : constraint.pointA,
initialPointB = constraint.bodyB ? Vector.add(constraint.bodyB.position, constraint.pointB) : constraint.pointB,
length = Vector.magnitude(Vector.sub(initialPointA, initialPointB));
constraint.length = typeof constraint.length !== 'undefined' ? constraint.length : length;
// option defaults
constraint.id = constraint.id || Common.nextId();
constraint.label = constraint.label || 'Constraint';
constraint.type = 'constraint';
constraint.stiffness = constraint.stiffness || (constraint.length > 0 ? 1 : 0.7);
constraint.damping = constraint.damping || 0;
constraint.angularStiffness = constraint.angularStiffness || 0;
constraint.angleA = constraint.bodyA ? constraint.bodyA.angle : constraint.angleA;
constraint.angleB = constraint.bodyB ? constraint.bodyB.angle : constraint.angleB;
constraint.plugin = {};
// render
var render = {
visible: true,
lineWidth: 2,
strokeStyle: '#ffffff',
type: 'line',
anchors: true
};
if (constraint.length === 0 && constraint.stiffness > 0.1) {
render.type = 'pin';
render.anchors = false;
} else if (constraint.stiffness < 0.9) {
render.type = 'spring';
}
constraint.render = Common.extend(render, constraint.render);
return constraint;
};
/**
* Prepares for solving by constraint warming.
* @private
* @method preSolveAll
* @param {body[]} bodies
*/
Constraint.preSolveAll = function(bodies) {
for (var i = 0; i < bodies.length; i += 1) {
var body = bodies[i],
impulse = body.constraintImpulse;
if (body.isStatic || (impulse.x === 0 && impulse.y === 0 && impulse.angle === 0)) {
continue;
}
body.position.x += impulse.x;
body.position.y += impulse.y;
body.angle += impulse.angle;
}
};
/**
* Solves all constraints in a list of collisions.
* @private
* @method solveAll
* @param {constraint[]} constraints
* @param {number} timeScale
*/
Constraint.solveAll = function(constraints, timeScale) {
// Solve fixed constraints first.
for (var i = 0; i < constraints.length; i += 1) {
var constraint = constraints[i],
fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic),
fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);
if (fixedA || fixedB) {
Constraint.solve(constraints[i], timeScale);
}
}
// Solve free constraints last.
for (i = 0; i < constraints.length; i += 1) {
constraint = constraints[i];
fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic);
fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);
if (!fixedA && !fixedB) {
Constraint.solve(constraints[i], timeScale);
}
}
};
/**
* Solves a distance constraint with Gauss-Siedel method.
* @private
* @method solve
* @param {constraint} constraint
* @param {number} timeScale
*/
Constraint.solve = function(constraint, timeScale) {
var bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
pointA = constraint.pointA,
pointB = constraint.pointB;
if (!bodyA && !bodyB)
return;
// update reference angle
if (bodyA && !bodyA.isStatic) {
Vector.rotate(pointA, bodyA.angle - constraint.angleA, pointA);
constraint.angleA = bodyA.angle;
}
// update reference angle
if (bodyB && !bodyB.isStatic) {
Vector.rotate(pointB, bodyB.angle - constraint.angleB, pointB);
constraint.angleB = bodyB.angle;
}
var pointAWorld = pointA,
pointBWorld = pointB;
if (bodyA) pointAWorld = Vector.add(bodyA.position, pointA);
if (bodyB) pointBWorld = Vector.add(bodyB.position, pointB);
if (!pointAWorld || !pointBWorld)
return;
var delta = Vector.sub(pointAWorld, pointBWorld),
currentLength = Vector.magnitude(delta);
// prevent singularity
if (currentLength < Constraint._minLength) {
currentLength = Constraint._minLength;
}
// solve distance constraint with Gauss-Siedel method
var difference = (currentLength - constraint.length) / currentLength,
stiffness = constraint.stiffness < 1 ? constraint.stiffness * timeScale : constraint.stiffness,
force = Vector.mult(delta, difference * stiffness),
massTotal = (bodyA ? bodyA.inverseMass : 0) + (bodyB ? bodyB.inverseMass : 0),
inertiaTotal = (bodyA ? bodyA.inverseInertia : 0) + (bodyB ? bodyB.inverseInertia : 0),
resistanceTotal = massTotal + inertiaTotal,
torque,
share,
normal,
normalVelocity,
relativeVelocity;
if (constraint.damping) {
var zero = Vector.create();
normal = Vector.div(delta, currentLength);
relativeVelocity = Vector.sub(
bodyB && Vector.sub(bodyB.position, bodyB.positionPrev) || zero,
bodyA && Vector.sub(bodyA.position, bodyA.positionPrev) || zero
);
normalVelocity = Vector.dot(normal, relativeVelocity);
}
if (bodyA && !bodyA.isStatic) {
share = bodyA.inverseMass / massTotal;
// keep track of applied impulses for post solving
bodyA.constraintImpulse.x -= force.x * share;
bodyA.constraintImpulse.y -= force.y * share;
// apply forces
bodyA.position.x -= force.x * share;
bodyA.position.y -= force.y * share;
// apply damping
if (constraint.damping) {
bodyA.positionPrev.x -= constraint.damping * normal.x * normalVelocity * share;
bodyA.positionPrev.y -= constraint.damping * normal.y * normalVelocity * share;
}
// apply torque
torque = (Vector.cross(pointA, force) / resistanceTotal) * Constraint._torqueDampen * bodyA.inverseInertia * (1 - constraint.angularStiffness);
bodyA.constraintImpulse.angle -= torque;
bodyA.angle -= torque;
}
if (bodyB && !bodyB.isStatic) {
share = bodyB.inverseMass / massTotal;
// keep track of applied impulses for post solving
bodyB.constraintImpulse.x += force.x * share;
bodyB.constraintImpulse.y += force.y * share;
// apply forces
bodyB.position.x += force.x * share;
bodyB.position.y += force.y * share;
// apply damping
if (constraint.damping) {
bodyB.positionPrev.x += constraint.damping * normal.x * normalVelocity * share;
bodyB.positionPrev.y += constraint.damping * normal.y * normalVelocity * share;
}
// apply torque
torque = (Vector.cross(pointB, force) / resistanceTotal) * Constraint._torqueDampen * bodyB.inverseInertia * (1 - constraint.angularStiffness);
bodyB.constraintImpulse.angle += torque;
bodyB.angle += torque;
}
};
/**
* Performs body updates required after solving constraints.
* @private
* @method postSolveAll
* @param {body[]} bodies
*/
Constraint.postSolveAll = function(bodies) {
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i],
impulse = body.constraintImpulse;
if (body.isStatic || (impulse.x === 0 && impulse.y === 0 && impulse.angle === 0)) {
continue;
}
Sleeping.set(body, false);
// update geometry and reset
for (var j = 0; j < body.parts.length; j++) {
var part = body.parts[j];
Vertices.translate(part.vertices, impulse);
if (j > 0) {
part.position.x += impulse.x;
part.position.y += impulse.y;
}
if (impulse.angle !== 0) {
Vertices.rotate(part.vertices, impulse.angle, body.position);
Axes.rotate(part.axes, impulse.angle);
if (j > 0) {
Vector.rotateAbout(part.position, impulse.angle, body.position, part.position);
}
}
Bounds.update(part.bounds, part.vertices, body.velocity);
}
// dampen the cached impulse for warming next step
impulse.angle *= Constraint._warming;
impulse.x *= Constraint._warming;
impulse.y *= Constraint._warming;
}
};
/*
*
* Properties Documentation
*
*/
/**
* An integer `Number` uniquely identifying number generated in `Composite.create` by `Common.nextId`.
*
* @property id
* @type number
*/
/**
* A `String` denoting the type of object.
*
* @property type
* @type string
* @default "constraint"
* @readOnly
*/
/**
* An arbitrary `String` name to help the user identify and manage bodies.
*
* @property label
* @type string
* @default "Constraint"
*/
/**
* An `Object` that defines the rendering properties to be consumed by the module `Matter.Render`.
*
* @property render
* @type object
*/
/**
* A flag that indicates if the constraint should be rendered.
*
* @property render.visible
* @type boolean
* @default true
*/
/**
* A `Number` that defines the line width to use when rendering the constraint outline.
* A value of `0` means no outline will be rendered.
*
* @property render.lineWidth
* @type number
* @default 2
*/
/**
* A `String` that defines the stroke style to use when rendering the constraint outline.
* It is the same as when using a canvas, so it accepts CSS style property values.
*
* @property render.strokeStyle
* @type string
* @default a random colour
*/
/**
* A `String` that defines the constraint rendering type.
* The possible values are 'line', 'pin', 'spring'.
* An appropriate render type will be automatically chosen unless one is given in options.
*
* @property render.type
* @type string
* @default 'line'
*/
/**
* A `Boolean` that defines if the constraint's anchor points should be rendered.
*
* @property render.anchors
* @type boolean
* @default true
*/
/**
* The first possible `Body` that this constraint is attached to.
*
* @property bodyA
* @type body
* @default null
*/
/**
* The second possible `Body` that this constraint is attached to.
*
* @property bodyB
* @type body
* @default null
*/
/**
* A `Vector` that specifies the offset of the constraint from center of the `constraint.bodyA` if defined, otherwise a world-space position.
*
* @property pointA
* @type vector
* @default { x: 0, y: 0 }
*/
/**
* A `Vector` that specifies the offset of the constraint from center of the `constraint.bodyA` if defined, otherwise a world-space position.
*
* @property pointB
* @type vector
* @default { x: 0, y: 0 }
*/
/**
* A `Number` that specifies the stiffness of the constraint, i.e. the rate at which it returns to its resting `constraint.length`.
* A value of `1` means the constraint should be very stiff.
* A value of `0.2` means the constraint acts like a soft spring.
*
* @property stiffness
* @type number
* @default 1
*/
/**
* A `Number` that specifies the damping of the constraint,
* i.e. the amount of resistance applied to each body based on their velocities to limit the amount of oscillation.
* Damping will only be apparent when the constraint also has a very low `stiffness`.
* A value of `0.1` means the constraint will apply heavy damping, resulting in little to no oscillation.
* A value of `0` means the constraint will apply no damping.
*
* @property damping
* @type number
* @default 0
*/
/**
* A `Number` that specifies the target resting length of the constraint.
* It is calculated automatically in `Constraint.create` from initial positions of the `constraint.bodyA` and `constraint.bodyB`.
*
* @property length
* @type number
*/
/**
* An object reserved for storing plugin-specific properties.
*
* @property plugin
* @type {}
*/
})();
},{"../core/Common":14,"../core/Sleeping":22,"../geometry/Axes":25,"../geometry/Bounds":26,"../geometry/Vector":28,"../geometry/Vertices":29}],13:[function(_dereq_,module,exports){
/**
* The `Matter.MouseConstraint` module contains methods for creating mouse constraints.
* Mouse constraints are used for allowing user interaction, providing the ability to move bodies via the mouse or touch.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class MouseConstraint
*/
var MouseConstraint = {};
module.exports = MouseConstraint;
var Vertices = _dereq_('../geometry/Vertices');
var Sleeping = _dereq_('../core/Sleeping');
var Mouse = _dereq_('../core/Mouse');
var Events = _dereq_('../core/Events');
var Detector = _dereq_('../collision/Detector');
var Constraint = _dereq_('./Constraint');
var Composite = _dereq_('../body/Composite');
var Common = _dereq_('../core/Common');
var Bounds = _dereq_('../geometry/Bounds');
(function() {
/**
* Creates a new mouse constraint.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {engine} engine
* @param {} options
* @return {MouseConstraint} A new MouseConstraint
*/
MouseConstraint.create = function(engine, options) {
var mouse = (engine ? engine.mouse : null) || (options ? options.mouse : null);
if (!mouse) {
if (engine && engine.render && engine.render.canvas) {
mouse = Mouse.create(engine.render.canvas);
} else if (options && options.element) {
mouse = Mouse.create(options.element);
} else {
mouse = Mouse.create();
Common.warn('MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected');
}
}
var constraint = Constraint.create({
label: 'Mouse Constraint',
pointA: mouse.position,
pointB: { x: 0, y: 0 },
length: 0.01,
stiffness: 0.1,
angularStiffness: 1,
render: {
strokeStyle: '#90EE90',
lineWidth: 3
}
});
var defaults = {
type: 'mouseConstraint',
mouse: mouse,
element: null,
body: null,
constraint: constraint,
collisionFilter: {
category: 0x0001,
mask: 0xFFFFFFFF,
group: 0
}
};
var mouseConstraint = Common.extend(defaults, options);
Events.on(engine, 'beforeUpdate', function() {
var allBodies = Composite.allBodies(engine.world);
MouseConstraint.update(mouseConstraint, allBodies);
_triggerEvents(mouseConstraint);
});
return mouseConstraint;
};
/**
* Updates the given mouse constraint.
* @private
* @method update
* @param {MouseConstraint} mouseConstraint
* @param {body[]} bodies
*/
MouseConstraint.update = function(mouseConstraint, bodies) {
var mouse = mouseConstraint.mouse,
constraint = mouseConstraint.constraint,
body = mouseConstraint.body;
if (mouse.button === 0) {
if (!constraint.bodyB) {
for (var i = 0; i < bodies.length; i++) {
body = bodies[i];
if (Bounds.contains(body.bounds, mouse.position)
&& Detector.canCollide(body.collisionFilter, mouseConstraint.collisionFilter)) {
for (var j = body.parts.length > 1 ? 1 : 0; j < body.parts.length; j++) {
var part = body.parts[j];
if (Vertices.contains(part.vertices, mouse.position)) {
constraint.pointA = mouse.position;
constraint.bodyB = mouseConstraint.body = body;
constraint.pointB = { x: mouse.position.x - body.position.x, y: mouse.position.y - body.position.y };
constraint.angleB = body.angle;
Sleeping.set(body, false);
Events.trigger(mouseConstraint, 'startdrag', { mouse: mouse, body: body });
break;
}
}
}
}
} else {
Sleeping.set(constraint.bodyB, false);
constraint.pointA = mouse.position;
}
} else {
constraint.bodyB = mouseConstraint.body = null;
constraint.pointB = null;
if (body)
Events.trigger(mouseConstraint, 'enddrag', { mouse: mouse, body: body });
}
};
/**
* Triggers mouse constraint events.
* @method _triggerEvents
* @private
* @param {mouse} mouseConstraint
*/
var _triggerEvents = function(mouseConstraint) {
var mouse = mouseConstraint.mouse,
mouseEvents = mouse.sourceEvents;
if (mouseEvents.mousemove)
Events.trigger(mouseConstraint, 'mousemove', { mouse: mouse });
if (mouseEvents.mousedown)
Events.trigger(mouseConstraint, 'mousedown', { mouse: mouse });
if (mouseEvents.mouseup)
Events.trigger(mouseConstraint, 'mouseup', { mouse: mouse });
// reset the mouse state ready for the next step
Mouse.clearSourceEvents(mouse);
};
/*
*
* Events Documentation
*
*/
/**
* Fired when the mouse has moved (or a touch moves) during the last step
*
* @event mousemove
* @param {} event An event object
* @param {mouse} event.mouse The engine's mouse instance
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when the mouse is down (or a touch has started) during the last step
*
* @event mousedown
* @param {} event An event object
* @param {mouse} event.mouse The engine's mouse instance
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when the mouse is up (or a touch has ended) during the last step
*
* @event mouseup
* @param {} event An event object
* @param {mouse} event.mouse The engine's mouse instance
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when the user starts dragging a body
*
* @event startdrag
* @param {} event An event object
* @param {mouse} event.mouse The engine's mouse instance
* @param {body} event.body The body being dragged
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired when the user ends dragging a body
*
* @event enddrag
* @param {} event An event object
* @param {mouse} event.mouse The engine's mouse instance
* @param {body} event.body The body that has stopped being dragged
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/*
*
* Properties Documentation
*
*/
/**
* A `String` denoting the type of object.
*
* @property type
* @type string
* @default "constraint"
* @readOnly
*/
/**
* The `Mouse` instance in use. If not supplied in `MouseConstraint.create`, one will be created.
*
* @property mouse
* @type mouse
* @default mouse
*/
/**
* The `Body` that is currently being moved by the user, or `null` if no body.
*
* @property body
* @type body
* @default null
*/
/**
* The `Constraint` object that is used to move the body during interaction.
*
* @property constraint
* @type constraint
*/
/**
* An `Object` that specifies the collision filter properties.
* The collision filter allows the user to define which types of body this mouse constraint can interact with.
* See `body.collisionFilter` for more information.
*
* @property collisionFilter
* @type object
*/
})();
},{"../body/Composite":2,"../collision/Detector":5,"../core/Common":14,"../core/Events":16,"../core/Mouse":19,"../core/Sleeping":22,"../geometry/Bounds":26,"../geometry/Vertices":29,"./Constraint":12}],14:[function(_dereq_,module,exports){
/**
* The `Matter.Common` module contains utility functions that are common to all modules.
*
* @class Common
*/
var Common = {};
module.exports = Common;
(function() {
Common._nextId = 0;
Common._seed = 0;
Common._nowStartTime = +(new Date());
/**
* Extends the object in the first argument using the object in the second argument.
* @method extend
* @param {} obj
* @param {boolean} deep
* @return {} obj extended
*/
Common.extend = function(obj, deep) {
var argsStart,
args,
deepClone;
if (typeof deep === 'boolean') {
argsStart = 2;
deepClone = deep;
} else {
argsStart = 1;
deepClone = true;
}
for (var i = argsStart; i < arguments.length; i++) {
var source = arguments[i];
if (source) {
for (var prop in source) {
if (deepClone && source[prop] && source[prop].constructor === Object) {
if (!obj[prop] || obj[prop].constructor === Object) {
obj[prop] = obj[prop] || {};
Common.extend(obj[prop], deepClone, source[prop]);
} else {
obj[prop] = source[prop];
}
} else {
obj[prop] = source[prop];
}
}
}
}
return obj;
};
/**
* Creates a new clone of the object, if deep is true references will also be cloned.
* @method clone
* @param {} obj
* @param {bool} deep
* @return {} obj cloned
*/
Common.clone = function(obj, deep) {
return Common.extend({}, deep, obj);
};
/**
* Returns the list of keys for the given object.
* @method keys
* @param {} obj
* @return {string[]} keys
*/
Common.keys = function(obj) {
if (Object.keys)
return Object.keys(obj);
// avoid hasOwnProperty for performance
var keys = [];
for (var key in obj)
keys.push(key);
return keys;
};
/**
* Returns the list of values for the given object.
* @method values
* @param {} obj
* @return {array} Array of the objects property values
*/
Common.values = function(obj) {
var values = [];
if (Object.keys) {
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
values.push(obj[keys[i]]);
}
return values;
}
// avoid hasOwnProperty for performance
for (var key in obj)
values.push(obj[key]);
return values;
};
/**
* Gets a value from `base` relative to the `path` string.
* @method get
* @param {} obj The base object
* @param {string} path The path relative to `base`, e.g. 'Foo.Bar.baz'
* @param {number} [begin] Path slice begin
* @param {number} [end] Path slice end
* @return {} The object at the given path
*/
Common.get = function(obj, path, begin, end) {
path = path.split('.').slice(begin, end);
for (var i = 0; i < path.length; i += 1) {
obj = obj[path[i]];
}
return obj;
};
/**
* Sets a value on `base` relative to the given `path` string.
* @method set
* @param {} obj The base object
* @param {string} path The path relative to `base`, e.g. 'Foo.Bar.baz'
* @param {} val The value to set
* @param {number} [begin] Path slice begin
* @param {number} [end] Path slice end
* @return {} Pass through `val` for chaining
*/
Common.set = function(obj, path, val, begin, end) {
var parts = path.split('.').slice(begin, end);
Common.get(obj, path, 0, -1)[parts[parts.length - 1]] = val;
return val;
};
/**
* Shuffles the given array in-place.
* The function uses a seeded random generator.
* @method shuffle
* @param {array} array
* @return {array} array shuffled randomly
*/
Common.shuffle = function(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Common.random() * (i + 1));
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
};
/**
* Randomly chooses a value from a list with equal probability.
* The function uses a seeded random generator.
* @method choose
* @param {array} choices
* @return {object} A random choice object from the array
*/
Common.choose = function(choices) {
return choices[Math.floor(Common.random() * choices.length)];
};
/**
* Returns true if the object is a HTMLElement, otherwise false.
* @method isElement
* @param {object} obj
* @return {boolean} True if the object is a HTMLElement, otherwise false
*/
Common.isElement = function(obj) {
return obj instanceof HTMLElement;
};
/**
* Returns true if the object is an array.
* @method isArray
* @param {object} obj
* @return {boolean} True if the object is an array, otherwise false
*/
Common.isArray = function(obj) {
return Object.prototype.toString.call(obj) === '[object Array]';
};
/**
* Returns true if the object is a function.
* @method isFunction
* @param {object} obj
* @return {boolean} True if the object is a function, otherwise false
*/
Common.isFunction = function(obj) {
return typeof obj === "function";
};
/**
* Returns true if the object is a plain object.
* @method isPlainObject
* @param {object} obj
* @return {boolean} True if the object is a plain object, otherwise false
*/
Common.isPlainObject = function(obj) {
return typeof obj === 'object' && obj.constructor === Object;
};
/**
* Returns true if the object is a string.
* @method isString
* @param {object} obj
* @return {boolean} True if the object is a string, otherwise false
*/
Common.isString = function(obj) {
return toString.call(obj) === '[object String]';
};
/**
* Returns the given value clamped between a minimum and maximum value.
* @method clamp
* @param {number} value
* @param {number} min
* @param {number} max
* @return {number} The value clamped between min and max inclusive
*/
Common.clamp = function(value, min, max) {
if (value < min)
return min;
if (value > max)
return max;
return value;
};
/**
* Returns the sign of the given value.
* @method sign
* @param {number} value
* @return {number} -1 if negative, +1 if 0 or positive
*/
Common.sign = function(value) {
return value < 0 ? -1 : 1;
};
/**
* Returns the current timestamp since the time origin (e.g. from page load).
* The result will be high-resolution including decimal places if available.
* @method now
* @return {number} the current timestamp
*/
Common.now = function() {
if (window.performance) {
if (window.performance.now) {
return window.performance.now();
} else if (window.performance.webkitNow) {
return window.performance.webkitNow();
}
}
return (new Date()) - Common._nowStartTime;
};
/**
* Returns a random value between a minimum and a maximum value inclusive.
* The function uses a seeded random generator.
* @method random
* @param {number} min
* @param {number} max
* @return {number} A random number between min and max inclusive
*/
Common.random = function(min, max) {
min = (typeof min !== "undefined") ? min : 0;
max = (typeof max !== "undefined") ? max : 1;
return min + _seededRandom() * (max - min);
};
var _seededRandom = function() {
// https://en.wikipedia.org/wiki/Linear_congruential_generator
Common._seed = (Common._seed * 9301 + 49297) % 233280;
return Common._seed / 233280;
};
/**
* Converts a CSS hex colour string into an integer.
* @method colorToNumber
* @param {string} colorString
* @return {number} An integer representing the CSS hex string
*/
Common.colorToNumber = function(colorString) {
colorString = colorString.replace('#','');
if (colorString.length == 3) {
colorString = colorString.charAt(0) + colorString.charAt(0)
+ colorString.charAt(1) + colorString.charAt(1)
+ colorString.charAt(2) + colorString.charAt(2);
}
return parseInt(colorString, 16);
};
/**
* The console logging level to use, where each level includes all levels above and excludes the levels below.
* The default level is 'debug' which shows all console messages.
*
* Possible level values are:
* - 0 = None
* - 1 = Debug
* - 2 = Info
* - 3 = Warn
* - 4 = Error
* @property Common.logLevel
* @type {Number}
* @default 1
*/
Common.logLevel = 1;
/**
* Shows a `console.log` message only if the current `Common.logLevel` allows it.
* The message will be prefixed with 'matter-js' to make it easily identifiable.
* @method log
* @param ...objs {} The objects to log.
*/
Common.log = function() {
if (console && Common.logLevel > 0 && Common.logLevel <= 3) {
console.log.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));
}
};
/**
* Shows a `console.info` message only if the current `Common.logLevel` allows it.
* The message will be prefixed with 'matter-js' to make it easily identifiable.
* @method info
* @param ...objs {} The objects to log.
*/
Common.info = function() {
if (console && Common.logLevel > 0 && Common.logLevel <= 2) {
console.info.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));
}
};
/**
* Shows a `console.warn` message only if the current `Common.logLevel` allows it.
* The message will be prefixed with 'matter-js' to make it easily identifiable.
* @method warn
* @param ...objs {} The objects to log.
*/
Common.warn = function() {
if (console && Common.logLevel > 0 && Common.logLevel <= 3) {
console.warn.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));
}
};
/**
* Returns the next unique sequential ID.
* @method nextId
* @return {Number} Unique sequential ID
*/
Common.nextId = function() {
return Common._nextId++;
};
/**
* A cross browser compatible indexOf implementation.
* @method indexOf
* @param {array} haystack
* @param {object} needle
* @return {number} The position of needle in haystack, otherwise -1.
*/
Common.indexOf = function(haystack, needle) {
if (haystack.indexOf)
return haystack.indexOf(needle);
for (var i = 0; i < haystack.length; i++) {
if (haystack[i] === needle)
return i;
}
return -1;
};
/**
* A cross browser compatible array map implementation.
* @method map
* @param {array} list
* @param {function} func
* @return {array} Values from list transformed by func.
*/
Common.map = function(list, func) {
if (list.map) {
return list.map(func);
}
var mapped = [];
for (var i = 0; i < list.length; i += 1) {
mapped.push(func(list[i]));
}
return mapped;
};
/**
* Takes a directed graph and returns the partially ordered set of vertices in topological order.
* Circular dependencies are allowed.
* @method topologicalSort
* @param {object} graph
* @return {array} Partially ordered set of vertices in topological order.
*/
Common.topologicalSort = function(graph) {
// https://github.com/mgechev/javascript-algorithms
// Copyright (c) Minko Gechev (MIT license)
// Modifications: tidy formatting and naming
var result = [],
visited = [],
temp = [];
for (var node in graph) {
if (!visited[node] && !temp[node]) {
_topologicalSort(node, visited, temp, graph, result);
}
}
return result;
};
var _topologicalSort = function(node, visited, temp, graph, result) {
var neighbors = graph[node] || [];
temp[node] = true;
for (var i = 0; i < neighbors.length; i += 1) {
var neighbor = neighbors[i];
if (temp[neighbor]) {
// skip circular dependencies
continue;
}
if (!visited[neighbor]) {
_topologicalSort(neighbor, visited, temp, graph, result);
}
}
temp[node] = false;
visited[node] = true;
result.push(node);
};
/**
* Takes _n_ functions as arguments and returns a new function that calls them in order.
* The arguments applied when calling the new function will also be applied to every function passed.
* The value of `this` refers to the last value returned in the chain that was not `undefined`.
* Therefore if a passed function does not return a value, the previously returned value is maintained.
* After all passed functions have been called the new function returns the last returned value (if any).
* If any of the passed functions are a chain, then the chain will be flattened.
* @method chain
* @param ...funcs {function} The functions to chain.
* @return {function} A new function that calls the passed functions in order.
*/
Common.chain = function() {
var funcs = [];
for (var i = 0; i < arguments.length; i += 1) {
var func = arguments[i];
if (func._chained) {
// flatten already chained functions
funcs.push.apply(funcs, func._chained);
} else {
funcs.push(func);
}
}
var chain = function() {
// https://github.com/GoogleChrome/devtools-docs/issues/53#issuecomment-51941358
var lastResult,
args = new Array(arguments.length);
for (var i = 0, l = arguments.length; i < l; i++) {
args[i] = arguments[i];
}
for (i = 0; i < funcs.length; i += 1) {
var result = funcs[i].apply(lastResult, args);
if (typeof result !== 'undefined') {
lastResult = result;
}
}
return lastResult;
};
chain._chained = funcs;
return chain;
};
/**
* Chains a function to excute before the original function on the given `path` relative to `base`.
* See also docs for `Common.chain`.
* @method chainPathBefore
* @param {} base The base object
* @param {string} path The path relative to `base`
* @param {function} func The function to chain before the original
* @return {function} The chained function that replaced the original
*/
Common.chainPathBefore = function(base, path, func) {
return Common.set(base, path, Common.chain(
func,
Common.get(base, path)
));
};
/**
* Chains a function to excute after the original function on the given `path` relative to `base`.
* See also docs for `Common.chain`.
* @method chainPathAfter
* @param {} base The base object
* @param {string} path The path relative to `base`
* @param {function} func The function to chain after the original
* @return {function} The chained function that replaced the original
*/
Common.chainPathAfter = function(base, path, func) {
return Common.set(base, path, Common.chain(
Common.get(base, path),
func
));
};
})();
},{}],15:[function(_dereq_,module,exports){
/**
* The `Matter.Engine` module contains methods for creating and manipulating engines.
* An engine is a controller that manages updating the simulation of the world.
* See `Matter.Runner` for an optional game loop utility.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Engine
*/
var Engine = {};
module.exports = Engine;
var World = _dereq_('../body/World');
var Sleeping = _dereq_('./Sleeping');
var Resolver = _dereq_('../collision/Resolver');
var Render = _dereq_('../render/Render');
var Pairs = _dereq_('../collision/Pairs');
var Metrics = _dereq_('./Metrics');
var Grid = _dereq_('../collision/Grid');
var Events = _dereq_('./Events');
var Composite = _dereq_('../body/Composite');
var Constraint = _dereq_('../constraint/Constraint');
var Common = _dereq_('./Common');
var Body = _dereq_('../body/Body');
(function() {
/**
* Creates a new engine. The options parameter is an object that specifies any properties you wish to override the defaults.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {object} [options]
* @return {engine} engine
*/
Engine.create = function(element, options) {
// options may be passed as the first (and only) argument
options = Common.isElement(element) ? options : element;
element = Common.isElement(element) ? element : null;
options = options || {};
if (element || options.render) {
Common.warn('Engine.create: engine.render is deprecated (see docs)');
}
var defaults = {
positionIterations: 6,
velocityIterations: 4,
constraintIterations: 2,
enableSleeping: false,
events: [],
plugin: {},
timing: {
timestamp: 0,
timeScale: 1
},
broadphase: {
controller: Grid
}
};
var engine = Common.extend(defaults, options);
// @deprecated
if (element || engine.render) {
var renderDefaults = {
element: element,
controller: Render
};
engine.render = Common.extend(renderDefaults, engine.render);
}
// @deprecated
if (engine.render && engine.render.controller) {
engine.render = engine.render.controller.create(engine.render);
}
// @deprecated
if (engine.render) {
engine.render.engine = engine;
}
engine.world = options.world || World.create(engine.world);
engine.pairs = Pairs.create();
engine.broadphase = engine.broadphase.controller.create(engine.broadphase);
engine.metrics = engine.metrics || { extended: false };
return engine;
};
/**
* Moves the simulation forward in time by `delta` ms.
* The `correction` argument is an optional `Number` that specifies the time correction factor to apply to the update.
* This can help improve the accuracy of the simulation in cases where `delta` is changing between updates.
* The value of `correction` is defined as `delta / lastDelta`, i.e. the percentage change of `delta` over the last step.
* Therefore the value is always `1` (no correction) when `delta` constant (or when no correction is desired, which is the default).
* See the paper on <a href="http://lonesock.net/article/verlet.html">Time Corrected Verlet</a> for more information.
*
* Triggers `beforeUpdate` and `afterUpdate` events.
* Triggers `collisionStart`, `collisionActive` and `collisionEnd` events.
* @method update
* @param {engine} engine
* @param {number} [delta=16.666]
* @param {number} [correction=1]
*/
Engine.update = function(engine, delta, correction) {
delta = delta || 1000 / 60;
correction = correction || 1;
var world = engine.world,
timing = engine.timing,
broadphase = engine.broadphase,
broadphasePairs = [],
i;
// increment timestamp
timing.timestamp += delta * timing.timeScale;
// create an event object
var event = {
timestamp: timing.timestamp
};
Events.trigger(engine, 'beforeUpdate', event);
// get lists of all bodies and constraints, no matter what composites they are in
var allBodies = Composite.allBodies(world),
allConstraints = Composite.allConstraints(world);
// if sleeping enabled, call the sleeping controller
if (engine.enableSleeping)
Sleeping.update(allBodies, timing.timeScale);
// applies gravity to all bodies
_bodiesApplyGravity(allBodies, world.gravity);
// update all body position and rotation by integration
_bodiesUpdate(allBodies, delta, timing.timeScale, correction, world.bounds);
// update all constraints (first pass)
Constraint.preSolveAll(allBodies);
for (i = 0; i < engine.constraintIterations; i++) {
Constraint.solveAll(allConstraints, timing.timeScale);
}
Constraint.postSolveAll(allBodies);
// broadphase pass: find potential collision pairs
if (broadphase.controller) {
// if world is dirty, we must flush the whole grid
if (world.isModified)
broadphase.controller.clear(broadphase);
// update the grid buckets based on current bodies
broadphase.controller.update(broadphase, allBodies, engine, world.isModified);
broadphasePairs = broadphase.pairsList;
} else {
// if no broadphase set, we just pass all bodies
broadphasePairs = allBodies;
}
// clear all composite modified flags
if (world.isModified) {
Composite.setModified(world, false, false, true);
}
// narrowphase pass: find actual collisions, then create or update collision pairs
var collisions = broadphase.detector(broadphasePairs, engine);
// update collision pairs
var pairs = engine.pairs,
timestamp = timing.timestamp;
Pairs.update(pairs, collisions, timestamp);
Pairs.removeOld(pairs, timestamp);
// wake up bodies involved in collisions
if (engine.enableSleeping)
Sleeping.afterCollisions(pairs.list, timing.timeScale);
// trigger collision events
if (pairs.collisionStart.length > 0)
Events.trigger(engine, 'collisionStart', { pairs: pairs.collisionStart });
// iteratively resolve position between collisions
Resolver.preSolvePosition(pairs.list);
for (i = 0; i < engine.positionIterations; i++) {
Resolver.solvePosition(pairs.list, timing.timeScale);
}
Resolver.postSolvePosition(allBodies);
// update all constraints (second pass)
Constraint.preSolveAll(allBodies);
for (i = 0; i < engine.constraintIterations; i++) {
Constraint.solveAll(allConstraints, timing.timeScale);
}
Constraint.postSolveAll(allBodies);
// iteratively resolve velocity between collisions
Resolver.preSolveVelocity(pairs.list);
for (i = 0; i < engine.velocityIterations; i++) {
Resolver.solveVelocity(pairs.list, timing.timeScale);
}
// trigger collision events
if (pairs.collisionActive.length > 0)
Events.trigger(engine, 'collisionActive', { pairs: pairs.collisionActive });
if (pairs.collisionEnd.length > 0)
Events.trigger(engine, 'collisionEnd', { pairs: pairs.collisionEnd });
// clear force buffers
_bodiesClearForces(allBodies);
Events.trigger(engine, 'afterUpdate', event);
return engine;
};
/**
* Merges two engines by keeping the configuration of `engineA` but replacing the world with the one from `engineB`.
* @method merge
* @param {engine} engineA
* @param {engine} engineB
*/
Engine.merge = function(engineA, engineB) {
Common.extend(engineA, engineB);
if (engineB.world) {
engineA.world = engineB.world;
Engine.clear(engineA);
var bodies = Composite.allBodies(engineA.world);
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
Sleeping.set(body, false);
body.id = Common.nextId();
}
}
};
/**
* Clears the engine including the world, pairs and broadphase.
* @method clear
* @param {engine} engine
*/
Engine.clear = function(engine) {
var world = engine.world;
Pairs.clear(engine.pairs);
var broadphase = engine.broadphase;
if (broadphase.controller) {
var bodies = Composite.allBodies(world);
broadphase.controller.clear(broadphase);
broadphase.controller.update(broadphase, bodies, engine, true);
}
};
/**
* Zeroes the `body.force` and `body.torque` force buffers.
* @method bodiesClearForces
* @private
* @param {body[]} bodies
*/
var _bodiesClearForces = function(bodies) {
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
// reset force buffers
body.force.x = 0;
body.force.y = 0;
body.torque = 0;
}
};
/**
* Applys a mass dependant force to all given bodies.
* @method bodiesApplyGravity
* @private
* @param {body[]} bodies
* @param {vector} gravity
*/
var _bodiesApplyGravity = function(bodies, gravity) {
var gravityScale = typeof gravity.scale !== 'undefined' ? gravity.scale : 0.001;
if ((gravity.x === 0 && gravity.y === 0) || gravityScale === 0) {
return;
}
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (body.isStatic || body.isSleeping)
continue;
// apply gravity
body.force.y += body.mass * gravity.y * gravityScale;
body.force.x += body.mass * gravity.x * gravityScale;
}
};
/**
* Applys `Body.update` to all given `bodies`.
* @method updateAll
* @private
* @param {body[]} bodies
* @param {number} deltaTime
* The amount of time elapsed between updates
* @param {number} timeScale
* @param {number} correction
* The Verlet correction factor (deltaTime / lastDeltaTime)
* @param {bounds} worldBounds
*/
var _bodiesUpdate = function(bodies, deltaTime, timeScale, correction, worldBounds) {
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (body.isStatic || body.isSleeping)
continue;
Body.update(body, deltaTime, timeScale, correction);
}
};
/**
* An alias for `Runner.run`, see `Matter.Runner` for more information.
* @method run
* @param {engine} engine
*/
/**
* Fired just before an update
*
* @event beforeUpdate
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after engine update and all collision events
*
* @event afterUpdate
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after engine update, provides a list of all pairs that have started to collide in the current tick (if any)
*
* @event collisionStart
* @param {} event An event object
* @param {} event.pairs List of affected pairs
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after engine update, provides a list of all pairs that are colliding in the current tick (if any)
*
* @event collisionActive
* @param {} event An event object
* @param {} event.pairs List of affected pairs
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after engine update, provides a list of all pairs that have ended collision in the current tick (if any)
*
* @event collisionEnd
* @param {} event An event object
* @param {} event.pairs List of affected pairs
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/*
*
* Properties Documentation
*
*/
/**
* An integer `Number` that specifies the number of position iterations to perform each update.
* The higher the value, the higher quality the simulation will be at the expense of performance.
*
* @property positionIterations
* @type number
* @default 6
*/
/**
* An integer `Number` that specifies the number of velocity iterations to perform each update.
* The higher the value, the higher quality the simulation will be at the expense of performance.
*
* @property velocityIterations
* @type number
* @default 4
*/
/**
* An integer `Number` that specifies the number of constraint iterations to perform each update.
* The higher the value, the higher quality the simulation will be at the expense of performance.
* The default value of `2` is usually very adequate.
*
* @property constraintIterations
* @type number
* @default 2
*/
/**
* A flag that specifies whether the engine should allow sleeping via the `Matter.Sleeping` module.
* Sleeping can improve stability and performance, but often at the expense of accuracy.
*
* @property enableSleeping
* @type boolean
* @default false
*/
/**
* An `Object` containing properties regarding the timing systems of the engine.
*
* @property timing
* @type object
*/
/**
* A `Number` that specifies the global scaling factor of time for all bodies.
* A value of `0` freezes the simulation.
* A value of `0.1` gives a slow-motion effect.
* A value of `1.2` gives a speed-up effect.
*
* @property timing.timeScale
* @type number
* @default 1
*/
/**
* A `Number` that specifies the current simulation-time in milliseconds starting from `0`.
* It is incremented on every `Engine.update` by the given `delta` argument.
*
* @property timing.timestamp
* @type number
* @default 0
*/
/**
* An instance of a `Render` controller. The default value is a `Matter.Render` instance created by `Engine.create`.
* One may also develop a custom renderer module based on `Matter.Render` and pass an instance of it to `Engine.create` via `options.render`.
*
* A minimal custom renderer object must define at least three functions: `create`, `clear` and `world` (see `Matter.Render`).
* It is also possible to instead pass the _module_ reference via `options.render.controller` and `Engine.create` will instantiate one for you.
*
* @property render
* @type render
* @deprecated see Demo.js for an example of creating a renderer
* @default a Matter.Render instance
*/
/**
* An instance of a broadphase controller. The default value is a `Matter.Grid` instance created by `Engine.create`.
*
* @property broadphase
* @type grid
* @default a Matter.Grid instance
*/
/**
* A `World` composite object that will contain all simulated bodies and constraints.
*
* @property world
* @type world
* @default a Matter.World instance
*/
/**
* An object reserved for storing plugin-specific properties.
*
* @property plugin
* @type {}
*/
})();
},{"../body/Body":1,"../body/Composite":2,"../body/World":3,"../collision/Grid":6,"../collision/Pairs":8,"../collision/Resolver":10,"../constraint/Constraint":12,"../render/Render":31,"./Common":14,"./Events":16,"./Metrics":18,"./Sleeping":22}],16:[function(_dereq_,module,exports){
/**
* The `Matter.Events` module contains methods to fire and listen to events on other objects.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Events
*/
var Events = {};
module.exports = Events;
var Common = _dereq_('./Common');
(function() {
/**
* Subscribes a callback function to the given object's `eventName`.
* @method on
* @param {} object
* @param {string} eventNames
* @param {function} callback
*/
Events.on = function(object, eventNames, callback) {
var names = eventNames.split(' '),
name;
for (var i = 0; i < names.length; i++) {
name = names[i];
object.events = object.events || {};
object.events[name] = object.events[name] || [];
object.events[name].push(callback);
}
return callback;
};
/**
* Removes the given event callback. If no callback, clears all callbacks in `eventNames`. If no `eventNames`, clears all events.
* @method off
* @param {} object
* @param {string} eventNames
* @param {function} callback
*/
Events.off = function(object, eventNames, callback) {
if (!eventNames) {
object.events = {};
return;
}
// handle Events.off(object, callback)
if (typeof eventNames === 'function') {
callback = eventNames;
eventNames = Common.keys(object.events).join(' ');
}
var names = eventNames.split(' ');
for (var i = 0; i < names.length; i++) {
var callbacks = object.events[names[i]],
newCallbacks = [];
if (callback && callbacks) {
for (var j = 0; j < callbacks.length; j++) {
if (callbacks[j] !== callback)
newCallbacks.push(callbacks[j]);
}
}
object.events[names[i]] = newCallbacks;
}
};
/**
* Fires all the callbacks subscribed to the given object's `eventName`, in the order they subscribed, if any.
* @method trigger
* @param {} object
* @param {string} eventNames
* @param {} event
*/
Events.trigger = function(object, eventNames, event) {
var names,
name,
callbacks,
eventClone;
if (object.events) {
if (!event)
event = {};
names = eventNames.split(' ');
for (var i = 0; i < names.length; i++) {
name = names[i];
callbacks = object.events[name];
if (callbacks) {
eventClone = Common.clone(event, false);
eventClone.name = name;
eventClone.source = object;
for (var j = 0; j < callbacks.length; j++) {
callbacks[j].apply(object, [eventClone]);
}
}
}
}
};
})();
},{"./Common":14}],17:[function(_dereq_,module,exports){
/**
* The `Matter` module is the top level namespace. It also includes a function for installing plugins on top of the library.
*
* @class Matter
*/
var Matter = {};
module.exports = Matter;
var Plugin = _dereq_('./Plugin');
var Common = _dereq_('./Common');
(function() {
/**
* The library name.
* @property name
* @readOnly
* @type {String}
*/
Matter.name = 'matter-js';
/**
* The library version.
* @property version
* @readOnly
* @type {String}
*/
Matter.version = '0.13.0';
/**
* A list of plugin dependencies to be installed. These are normally set and installed through `Matter.use`.
* Alternatively you may set `Matter.uses` manually and install them by calling `Plugin.use(Matter)`.
* @property uses
* @type {Array}
*/
Matter.uses = [];
/**
* The plugins that have been installed through `Matter.Plugin.install`. Read only.
* @property used
* @readOnly
* @type {Array}
*/
Matter.used = [];
/**
* Installs the given plugins on the `Matter` namespace.
* This is a short-hand for `Plugin.use`, see it for more information.
* Call this function once at the start of your code, with all of the plugins you wish to install as arguments.
* Avoid calling this function multiple times unless you intend to manually control installation order.
* @method use
* @param ...plugin {Function} The plugin(s) to install on `base` (multi-argument).
*/
Matter.use = function() {
Plugin.use(Matter, Array.prototype.slice.call(arguments));
};
/**
* Chains a function to excute before the original function on the given `path` relative to `Matter`.
* See also docs for `Common.chain`.
* @method before
* @param {string} path The path relative to `Matter`
* @param {function} func The function to chain before the original
* @return {function} The chained function that replaced the original
*/
Matter.before = function(path, func) {
path = path.replace(/^Matter./, '');
return Common.chainPathBefore(Matter, path, func);
};
/**
* Chains a function to excute after the original function on the given `path` relative to `Matter`.
* See also docs for `Common.chain`.
* @method after
* @param {string} path The path relative to `Matter`
* @param {function} func The function to chain after the original
* @return {function} The chained function that replaced the original
*/
Matter.after = function(path, func) {
path = path.replace(/^Matter./, '');
return Common.chainPathAfter(Matter, path, func);
};
})();
},{"./Common":14,"./Plugin":20}],18:[function(_dereq_,module,exports){
},{"../body/Composite":2,"./Common":14}],19:[function(_dereq_,module,exports){
/**
* The `Matter.Mouse` module contains methods for creating and manipulating mouse inputs.
*
* @class Mouse
*/
var Mouse = {};
module.exports = Mouse;
var Common = _dereq_('../core/Common');
(function() {
/**
* Creates a mouse input.
* @method create
* @param {HTMLElement} element
* @return {mouse} A new mouse
*/
Mouse.create = function(element) {
var mouse = {};
if (!element) {
Common.log('Mouse.create: element was undefined, defaulting to document.body', 'warn');
}
mouse.element = element || document.body;
mouse.absolute = { x: 0, y: 0 };
mouse.position = { x: 0, y: 0 };
mouse.mousedownPosition = { x: 0, y: 0 };
mouse.mouseupPosition = { x: 0, y: 0 };
mouse.offset = { x: 0, y: 0 };
mouse.scale = { x: 1, y: 1 };
mouse.wheelDelta = 0;
mouse.button = -1;
mouse.pixelRatio = mouse.element.getAttribute('data-pixel-ratio') || 1;
mouse.sourceEvents = {
mousemove: null,
mousedown: null,
mouseup: null,
mousewheel: null
};
mouse.mousemove = function(event) {
var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),
touches = event.changedTouches;
if (touches) {
mouse.button = 0;
event.preventDefault();
}
mouse.absolute.x = position.x;
mouse.absolute.y = position.y;
mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;
mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;
mouse.sourceEvents.mousemove = event;
};
mouse.mousedown = function(event) {
var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),
touches = event.changedTouches;
if (touches) {
mouse.button = 0;
event.preventDefault();
} else {
mouse.button = event.button;
}
mouse.absolute.x = position.x;
mouse.absolute.y = position.y;
mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;
mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;
mouse.mousedownPosition.x = mouse.position.x;
mouse.mousedownPosition.y = mouse.position.y;
mouse.sourceEvents.mousedown = event;
};
mouse.mouseup = function(event) {
var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),
touches = event.changedTouches;
if (touches) {
event.preventDefault();
}
mouse.button = -1;
mouse.absolute.x = position.x;
mouse.absolute.y = position.y;
mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;
mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;
mouse.mouseupPosition.x = mouse.position.x;
mouse.mouseupPosition.y = mouse.position.y;
mouse.sourceEvents.mouseup = event;
};
mouse.mousewheel = function(event) {
mouse.wheelDelta = Math.max(-1, Math.min(1, event.wheelDelta || -event.detail));
event.preventDefault();
};
Mouse.setElement(mouse, mouse.element);
return mouse;
};
/**
* Sets the element the mouse is bound to (and relative to).
* @method setElement
* @param {mouse} mouse
* @param {HTMLElement} element
*/
Mouse.setElement = function(mouse, element) {
mouse.element = element;
element.addEventListener('mousemove', mouse.mousemove);
element.addEventListener('mousedown', mouse.mousedown);
element.addEventListener('mouseup', mouse.mouseup);
element.addEventListener('mousewheel', mouse.mousewheel);
element.addEventListener('DOMMouseScroll', mouse.mousewheel);
element.addEventListener('touchmove', mouse.mousemove);
element.addEventListener('touchstart', mouse.mousedown);
element.addEventListener('touchend', mouse.mouseup);
};
/**
* Clears all captured source events.
* @method clearSourceEvents
* @param {mouse} mouse
*/
Mouse.clearSourceEvents = function(mouse) {
mouse.sourceEvents.mousemove = null;
mouse.sourceEvents.mousedown = null;
mouse.sourceEvents.mouseup = null;
mouse.sourceEvents.mousewheel = null;
mouse.wheelDelta = 0;
};
/**
* Sets the mouse position offset.
* @method setOffset
* @param {mouse} mouse
* @param {vector} offset
*/
Mouse.setOffset = function(mouse, offset) {
mouse.offset.x = offset.x;
mouse.offset.y = offset.y;
mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;
mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;
};
/**
* Sets the mouse position scale.
* @method setScale
* @param {mouse} mouse
* @param {vector} scale
*/
Mouse.setScale = function(mouse, scale) {
mouse.scale.x = scale.x;
mouse.scale.y = scale.y;
mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;
mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;
};
/**
* Gets the mouse position relative to an element given a screen pixel ratio.
* @method _getRelativeMousePosition
* @private
* @param {} event
* @param {} element
* @param {number} pixelRatio
* @return {}
*/
var _getRelativeMousePosition = function(event, element, pixelRatio) {
var elementBounds = element.getBoundingClientRect(),
rootNode = (document.documentElement || document.body.parentNode || document.body),
scrollX = (window.pageXOffset !== undefined) ? window.pageXOffset : rootNode.scrollLeft,
scrollY = (window.pageYOffset !== undefined) ? window.pageYOffset : rootNode.scrollTop,
touches = event.changedTouches,
x, y;
if (touches) {
x = touches[0].pageX - elementBounds.left - scrollX;
y = touches[0].pageY - elementBounds.top - scrollY;
} else {
x = event.pageX - elementBounds.left - scrollX;
y = event.pageY - elementBounds.top - scrollY;
}
return {
x: x / (element.clientWidth / (element.width || element.clientWidth) * pixelRatio),
y: y / (element.clientHeight / (element.height || element.clientHeight) * pixelRatio)
};
};
})();
},{"../core/Common":14}],20:[function(_dereq_,module,exports){
/**
* The `Matter.Plugin` module contains functions for registering and installing plugins on modules.
*
* @class Plugin
*/
var Plugin = {};
module.exports = Plugin;
var Common = _dereq_('./Common');
(function() {
Plugin._registry = {};
/**
* Registers a plugin object so it can be resolved later by name.
* @method register
* @param plugin {} The plugin to register.
* @return {object} The plugin.
*/
Plugin.register = function(plugin) {
if (!Plugin.isPlugin(plugin)) {
Common.warn('Plugin.register:', Plugin.toString(plugin), 'does not implement all required fields.');
}
if (plugin.name in Plugin._registry) {
var registered = Plugin._registry[plugin.name],
pluginVersion = Plugin.versionParse(plugin.version).number,
registeredVersion = Plugin.versionParse(registered.version).number;
if (pluginVersion > registeredVersion) {
Common.warn('Plugin.register:', Plugin.toString(registered), 'was upgraded to', Plugin.toString(plugin));
Plugin._registry[plugin.name] = plugin;
} else if (pluginVersion < registeredVersion) {
Common.warn('Plugin.register:', Plugin.toString(registered), 'can not be downgraded to', Plugin.toString(plugin));
} else if (plugin !== registered) {
Common.warn('Plugin.register:', Plugin.toString(plugin), 'is already registered to different plugin object');
}
} else {
Plugin._registry[plugin.name] = plugin;
}
return plugin;
};
/**
* Resolves a dependency to a plugin object from the registry if it exists.
* The `dependency` may contain a version, but only the name matters when resolving.
* @method resolve
* @param dependency {string} The dependency.
* @return {object} The plugin if resolved, otherwise `undefined`.
*/
Plugin.resolve = function(dependency) {
return Plugin._registry[Plugin.dependencyParse(dependency).name];
};
/**
* Returns a pretty printed plugin name and version.
* @method toString
* @param plugin {} The plugin.
* @return {string} Pretty printed plugin name and version.
*/
Plugin.toString = function(plugin) {
return typeof plugin === 'string' ? plugin : (plugin.name || 'anonymous') + '@' + (plugin.version || plugin.range || '0.0.0');
};
/**
* Returns `true` if the object meets the minimum standard to be considered a plugin.
* This means it must define the following properties:
* - `name`
* - `version`
* - `install`
* @method isPlugin
* @param obj {} The obj to test.
* @return {boolean} `true` if the object can be considered a plugin otherwise `false`.
*/
Plugin.isPlugin = function(obj) {
return obj && obj.name && obj.version && obj.install;
};
/**
* Returns `true` if a plugin with the given `name` been installed on `module`.
* @method isUsed
* @param module {} The module.
* @param name {string} The plugin name.
* @return {boolean} `true` if a plugin with the given `name` been installed on `module`, otherwise `false`.
*/
Plugin.isUsed = function(module, name) {
return module.used.indexOf(name) > -1;
};
/**
* Returns `true` if `plugin.for` is applicable to `module` by comparing against `module.name` and `module.version`.
* If `plugin.for` is not specified then it is assumed to be applicable.
* The value of `plugin.for` is a string of the format `'module-name'` or `'module-name@version'`.
* @method isFor
* @param plugin {} The plugin.
* @param module {} The module.
* @return {boolean} `true` if `plugin.for` is applicable to `module`, otherwise `false`.
*/
Plugin.isFor = function(plugin, module) {
var parsed = plugin.for && Plugin.dependencyParse(plugin.for);
return !plugin.for || (module.name === parsed.name && Plugin.versionSatisfies(module.version, parsed.range));
};
/**
* Installs the plugins by calling `plugin.install` on each plugin specified in `plugins` if passed, otherwise `module.uses`.
* For installing plugins on `Matter` see the convenience function `Matter.use`.
* Plugins may be specified either by their name or a reference to the plugin object.
* Plugins themselves may specify further dependencies, but each plugin is installed only once.
* Order is important, a topological sort is performed to find the best resulting order of installation.
* This sorting attempts to satisfy every dependency's requested ordering, but may not be exact in all cases.
* This function logs the resulting status of each dependency in the console, along with any warnings.
* - A green tick ✅ indicates a dependency was resolved and installed.
* - An orange diamond 🔶 indicates a dependency was resolved but a warning was thrown for it or one if its dependencies.
* - A red cross ❌ indicates a dependency could not be resolved.
* Avoid calling this function multiple times on the same module unless you intend to manually control installation order.
* @method use
* @param module {} The module install plugins on.
* @param [plugins=module.uses] {} The plugins to install on module (optional, defaults to `module.uses`).
*/
Plugin.use = function(module, plugins) {
module.uses = (module.uses || []).concat(plugins || []);
if (module.uses.length === 0) {
Common.warn('Plugin.use:', Plugin.toString(module), 'does not specify any dependencies to install.');
return;
}
var dependencies = Plugin.dependencies(module),
sortedDependencies = Common.topologicalSort(dependencies),
status = [];
for (var i = 0; i < sortedDependencies.length; i += 1) {
if (sortedDependencies[i] === module.name) {
continue;
}
var plugin = Plugin.resolve(sortedDependencies[i]);
if (!plugin) {
status.push('❌ ' + sortedDependencies[i]);
continue;
}
if (Plugin.isUsed(module, plugin.name)) {
continue;
}
if (!Plugin.isFor(plugin, module)) {
Common.warn('Plugin.use:', Plugin.toString(plugin), 'is for', plugin.for, 'but installed on', Plugin.toString(module) + '.');
plugin._warned = true;
}
if (plugin.install) {
plugin.install(module);
} else {
Common.warn('Plugin.use:', Plugin.toString(plugin), 'does not specify an install function.');
plugin._warned = true;
}
if (plugin._warned) {
status.push('🔶 ' + Plugin.toString(plugin));
delete plugin._warned;
} else {
status.push('✅ ' + Plugin.toString(plugin));
}
module.used.push(plugin.name);
}
if (status.length > 0) {
Common.info(status.join(' '));
}
};
/**
* Recursively finds all of a module's dependencies and returns a flat dependency graph.
* @method dependencies
* @param module {} The module.
* @return {object} A dependency graph.
*/
Plugin.dependencies = function(module, tracked) {
var parsedBase = Plugin.dependencyParse(module),
name = parsedBase.name;
tracked = tracked || {};
if (name in tracked) {
return;
}
module = Plugin.resolve(module) || module;
tracked[name] = Common.map(module.uses || [], function(dependency) {
if (Plugin.isPlugin(dependency)) {
Plugin.register(dependency);
}
var parsed = Plugin.dependencyParse(dependency),
resolved = Plugin.resolve(dependency);
if (resolved && !Plugin.versionSatisfies(resolved.version, parsed.range)) {
Common.warn(
'Plugin.dependencies:', Plugin.toString(resolved), 'does not satisfy',
Plugin.toString(parsed), 'used by', Plugin.toString(parsedBase) + '.'
);
resolved._warned = true;
module._warned = true;
} else if (!resolved) {
Common.warn(
'Plugin.dependencies:', Plugin.toString(dependency), 'used by',
Plugin.toString(parsedBase), 'could not be resolved.'
);
module._warned = true;
}
return parsed.name;
});
for (var i = 0; i < tracked[name].length; i += 1) {
Plugin.dependencies(tracked[name][i], tracked);
}
return tracked;
};
/**
* Parses a dependency string into its components.
* The `dependency` is a string of the format `'module-name'` or `'module-name@version'`.
* See documentation for `Plugin.versionParse` for a description of the format.
* This function can also handle dependencies that are already resolved (e.g. a module object).
* @method dependencyParse
* @param dependency {string} The dependency of the format `'module-name'` or `'module-name@version'`.
* @return {object} The dependency parsed into its components.
*/
Plugin.dependencyParse = function(dependency) {
if (Common.isString(dependency)) {
var pattern = /^[\w-]+(@(\*|[\^~]?\d+\.\d+\.\d+(-[0-9A-Za-z-]+)?))?$/;
if (!pattern.test(dependency)) {
Common.warn('Plugin.dependencyParse:', dependency, 'is not a valid dependency string.');
}
return {
name: dependency.split('@')[0],
range: dependency.split('@')[1] || '*'
};
}
return {
name: dependency.name,
range: dependency.range || dependency.version
};
};
/**
* Parses a version string into its components.
* Versions are strictly of the format `x.y.z` (as in [semver](http://semver.org/)).
* Versions may optionally have a prerelease tag in the format `x.y.z-alpha`.
* Ranges are a strict subset of [npm ranges](https://docs.npmjs.com/misc/semver#advanced-range-syntax).
* Only the following range types are supported:
* - Tilde ranges e.g. `~1.2.3`
* - Caret ranges e.g. `^1.2.3`
* - Exact version e.g. `1.2.3`
* - Any version `*`
* @method versionParse
* @param range {string} The version string.
* @return {object} The version range parsed into its components.
*/
Plugin.versionParse = function(range) {
var pattern = /^\*|[\^~]?\d+\.\d+\.\d+(-[0-9A-Za-z-]+)?$/;
if (!pattern.test(range)) {
Common.warn('Plugin.versionParse:', range, 'is not a valid version or range.');
}
var identifiers = range.split('-');
range = identifiers[0];
var isRange = isNaN(Number(range[0])),
version = isRange ? range.substr(1) : range,
parts = Common.map(version.split('.'), function(part) {
return Number(part);
});
return {
isRange: isRange,
version: version,
range: range,
operator: isRange ? range[0] : '',
parts: parts,
prerelease: identifiers[1],
number: parts[0] * 1e8 + parts[1] * 1e4 + parts[2]
};
};
/**
* Returns `true` if `version` satisfies the given `range`.
* See documentation for `Plugin.versionParse` for a description of the format.
* If a version or range is not specified, then any version (`*`) is assumed to satisfy.
* @method versionSatisfies
* @param version {string} The version string.
* @param range {string} The range string.
* @return {boolean} `true` if `version` satisfies `range`, otherwise `false`.
*/
Plugin.versionSatisfies = function(version, range) {
range = range || '*';
var rangeParsed = Plugin.versionParse(range),
rangeParts = rangeParsed.parts,
versionParsed = Plugin.versionParse(version),
versionParts = versionParsed.parts;
if (rangeParsed.isRange) {
if (rangeParsed.operator === '*' || version === '*') {
return true;
}
if (rangeParsed.operator === '~') {
return versionParts[0] === rangeParts[0] && versionParts[1] === rangeParts[1] && versionParts[2] >= rangeParts[2];
}
if (rangeParsed.operator === '^') {
if (rangeParts[0] > 0) {
return versionParts[0] === rangeParts[0] && versionParsed.number >= rangeParsed.number;
}
if (rangeParts[1] > 0) {
return versionParts[1] === rangeParts[1] && versionParts[2] >= rangeParts[2];
}
return versionParts[2] === rangeParts[2];
}
}
return version === range || version === '*';
};
})();
},{"./Common":14}],21:[function(_dereq_,module,exports){
/**
* The `Matter.Runner` module is an optional utility which provides a game loop,
* that handles continuously updating a `Matter.Engine` for you within a browser.
* It is intended for development and debugging purposes, but may also be suitable for simple games.
* If you are using your own game loop instead, then you do not need the `Matter.Runner` module.
* Instead just call `Engine.update(engine, delta)` in your own loop.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Runner
*/
var Runner = {};
module.exports = Runner;
var Events = _dereq_('./Events');
var Engine = _dereq_('./Engine');
var Common = _dereq_('./Common');
(function() {
var _requestAnimationFrame,
_cancelAnimationFrame;
if (typeof window !== 'undefined') {
_requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame || window.msRequestAnimationFrame;
_cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame
|| window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;
}
if (!_requestAnimationFrame) {
var _frameTimeout;
_requestAnimationFrame = function(callback){
_frameTimeout = setTimeout(function() {
callback(Common.now());
}, 1000 / 60);
};
_cancelAnimationFrame = function() {
clearTimeout(_frameTimeout);
};
}
/**
* Creates a new Runner. The options parameter is an object that specifies any properties you wish to override the defaults.
* @method create
* @param {} options
*/
Runner.create = function(options) {
var defaults = {
fps: 60,
correction: 1,
deltaSampleSize: 60,
counterTimestamp: 0,
frameCounter: 0,
deltaHistory: [],
timePrev: null,
timeScalePrev: 1,
frameRequestId: null,
isFixed: false,
enabled: true
};
var runner = Common.extend(defaults, options);
runner.delta = runner.delta || 1000 / runner.fps;
runner.deltaMin = runner.deltaMin || 1000 / runner.fps;
runner.deltaMax = runner.deltaMax || 1000 / (runner.fps * 0.5);
runner.fps = 1000 / runner.delta;
return runner;
};
/**
* Continuously ticks a `Matter.Engine` by calling `Runner.tick` on the `requestAnimationFrame` event.
* @method run
* @param {engine} engine
*/
Runner.run = function(runner, engine) {
// create runner if engine is first argument
if (typeof runner.positionIterations !== 'undefined') {
engine = runner;
runner = Runner.create();
}
(function render(time){
runner.frameRequestId = _requestAnimationFrame(render);
if (time && runner.enabled) {
Runner.tick(runner, engine, time);
}
})();
return runner;
};
/**
* A game loop utility that updates the engine and renderer by one step (a 'tick').
* Features delta smoothing, time correction and fixed or dynamic timing.
* Triggers `beforeTick`, `tick` and `afterTick` events on the engine.
* Consider just `Engine.update(engine, delta)` if you're using your own loop.
* @method tick
* @param {runner} runner
* @param {engine} engine
* @param {number} time
*/
Runner.tick = function(runner, engine, time) {
var timing = engine.timing,
correction = 1,
delta;
// create an event object
var event = {
timestamp: timing.timestamp
};
Events.trigger(runner, 'beforeTick', event);
Events.trigger(engine, 'beforeTick', event); // @deprecated
if (runner.isFixed) {
// fixed timestep
delta = runner.delta;
} else {
// dynamic timestep based on wall clock between calls
delta = (time - runner.timePrev) || runner.delta;
runner.timePrev = time;
// optimistically filter delta over a few frames, to improve stability
runner.deltaHistory.push(delta);
runner.deltaHistory = runner.deltaHistory.slice(-runner.deltaSampleSize);
delta = Math.min.apply(null, runner.deltaHistory);
// limit delta
delta = delta < runner.deltaMin ? runner.deltaMin : delta;
delta = delta > runner.deltaMax ? runner.deltaMax : delta;
// correction for delta
correction = delta / runner.delta;
// update engine timing object
runner.delta = delta;
}
// time correction for time scaling
if (runner.timeScalePrev !== 0)
correction *= timing.timeScale / runner.timeScalePrev;
if (timing.timeScale === 0)
correction = 0;
runner.timeScalePrev = timing.timeScale;
runner.correction = correction;
// fps counter
runner.frameCounter += 1;
if (time - runner.counterTimestamp >= 1000) {
runner.fps = runner.frameCounter * ((time - runner.counterTimestamp) / 1000);
runner.counterTimestamp = time;
runner.frameCounter = 0;
}
Events.trigger(runner, 'tick', event);
Events.trigger(engine, 'tick', event); // @deprecated
// if world has been modified, clear the render scene graph
if (engine.world.isModified
&& engine.render
&& engine.render.controller
&& engine.render.controller.clear) {
engine.render.controller.clear(engine.render); // @deprecated
}
// update
Events.trigger(runner, 'beforeUpdate', event);
Engine.update(engine, delta, correction);
Events.trigger(runner, 'afterUpdate', event);
// render
// @deprecated
if (engine.render && engine.render.controller) {
Events.trigger(runner, 'beforeRender', event);
Events.trigger(engine, 'beforeRender', event); // @deprecated
engine.render.controller.world(engine.render);
Events.trigger(runner, 'afterRender', event);
Events.trigger(engine, 'afterRender', event); // @deprecated
}
Events.trigger(runner, 'afterTick', event);
Events.trigger(engine, 'afterTick', event); // @deprecated
};
/**
* Ends execution of `Runner.run` on the given `runner`, by canceling the animation frame request event loop.
* If you wish to only temporarily pause the engine, see `engine.enabled` instead.
* @method stop
* @param {runner} runner
*/
Runner.stop = function(runner) {
_cancelAnimationFrame(runner.frameRequestId);
};
/**
* Alias for `Runner.run`.
* @method start
* @param {runner} runner
* @param {engine} engine
*/
Runner.start = function(runner, engine) {
Runner.run(runner, engine);
};
/*
*
* Events Documentation
*
*/
/**
* Fired at the start of a tick, before any updates to the engine or timing
*
* @event beforeTick
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after engine timing updated, but just before update
*
* @event tick
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired at the end of a tick, after engine update and after rendering
*
* @event afterTick
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired before update
*
* @event beforeUpdate
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after update
*
* @event afterUpdate
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired before rendering
*
* @event beforeRender
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
* @deprecated
*/
/**
* Fired after rendering
*
* @event afterRender
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
* @deprecated
*/
/*
*
* Properties Documentation
*
*/
/**
* A flag that specifies whether the runner is running or not.
*
* @property enabled
* @type boolean
* @default true
*/
/**
* A `Boolean` that specifies if the runner should use a fixed timestep (otherwise it is variable).
* If timing is fixed, then the apparent simulation speed will change depending on the frame rate (but behaviour will be deterministic).
* If the timing is variable, then the apparent simulation speed will be constant (approximately, but at the cost of determininism).
*
* @property isFixed
* @type boolean
* @default false
*/
/**
* A `Number` that specifies the time step between updates in milliseconds.
* If `engine.timing.isFixed` is set to `true`, then `delta` is fixed.
* If it is `false`, then `delta` can dynamically change to maintain the correct apparent simulation speed.
*
* @property delta
* @type number
* @default 1000 / 60
*/
})();
},{"./Common":14,"./Engine":15,"./Events":16}],22:[function(_dereq_,module,exports){
/**
* The `Matter.Sleeping` module contains methods to manage the sleeping state of bodies.
*
* @class Sleeping
*/
var Sleeping = {};
module.exports = Sleeping;
var Events = _dereq_('./Events');
(function() {
Sleeping._motionWakeThreshold = 0.18;
Sleeping._motionSleepThreshold = 0.08;
Sleeping._minBias = 0.9;
/**
* Puts bodies to sleep or wakes them up depending on their motion.
* @method update
* @param {body[]} bodies
* @param {number} timeScale
*/
Sleeping.update = function(bodies, timeScale) {
var timeFactor = timeScale * timeScale * timeScale;
// update bodies sleeping status
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i],
motion = body.speed * body.speed + body.angularSpeed * body.angularSpeed;
// wake up bodies if they have a force applied
if (body.force.x !== 0 || body.force.y !== 0) {
Sleeping.set(body, false);
continue;
}
var minMotion = Math.min(body.motion, motion),
maxMotion = Math.max(body.motion, motion);
// biased average motion estimation between frames
body.motion = Sleeping._minBias * minMotion + (1 - Sleeping._minBias) * maxMotion;
if (body.sleepThreshold > 0 && body.motion < Sleeping._motionSleepThreshold * timeFactor) {
body.sleepCounter += 1;
if (body.sleepCounter >= body.sleepThreshold)
Sleeping.set(body, true);
} else if (body.sleepCounter > 0) {
body.sleepCounter -= 1;
}
}
};
/**
* Given a set of colliding pairs, wakes the sleeping bodies involved.
* @method afterCollisions
* @param {pair[]} pairs
* @param {number} timeScale
*/
Sleeping.afterCollisions = function(pairs, timeScale) {
var timeFactor = timeScale * timeScale * timeScale;
// wake up bodies involved in collisions
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i];
// don't wake inactive pairs
if (!pair.isActive)
continue;
var collision = pair.collision,
bodyA = collision.bodyA.parent,
bodyB = collision.bodyB.parent;
// don't wake if at least one body is static
if ((bodyA.isSleeping && bodyB.isSleeping) || bodyA.isStatic || bodyB.isStatic)
continue;
if (bodyA.isSleeping || bodyB.isSleeping) {
var sleepingBody = (bodyA.isSleeping && !bodyA.isStatic) ? bodyA : bodyB,
movingBody = sleepingBody === bodyA ? bodyB : bodyA;
if (!sleepingBody.isStatic && movingBody.motion > Sleeping._motionWakeThreshold * timeFactor) {
Sleeping.set(sleepingBody, false);
}
}
}
};
/**
* Set a body as sleeping or awake.
* @method set
* @param {body} body
* @param {boolean} isSleeping
*/
Sleeping.set = function(body, isSleeping) {
var wasSleeping = body.isSleeping;
if (isSleeping) {
body.isSleeping = true;
body.sleepCounter = body.sleepThreshold;
body.positionImpulse.x = 0;
body.positionImpulse.y = 0;
body.positionPrev.x = body.position.x;
body.positionPrev.y = body.position.y;
body.anglePrev = body.angle;
body.speed = 0;
body.angularSpeed = 0;
body.motion = 0;
if (!wasSleeping) {
Events.trigger(body, 'sleepStart');
}
} else {
body.isSleeping = false;
body.sleepCounter = 0;
if (wasSleeping) {
Events.trigger(body, 'sleepEnd');
}
}
};
})();
},{"./Events":16}],23:[function(_dereq_,module,exports){
(function (global){
/**
* The `Matter.Bodies` module contains factory methods for creating rigid body models
* with commonly used body configurations (such as rectangles, circles and other polygons).
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Bodies
*/
// TODO: true circle bodies
var Bodies = {};
module.exports = Bodies;
var Vertices = _dereq_('../geometry/Vertices');
var Common = _dereq_('../core/Common');
var Body = _dereq_('../body/Body');
var Bounds = _dereq_('../geometry/Bounds');
var Vector = _dereq_('../geometry/Vector');
var decomp = (typeof window !== "undefined" ? window['decomp'] : typeof global !== "undefined" ? global['decomp'] : null);
(function() {
/**
* Creates a new rigid body model with a rectangle hull.
* The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method rectangle
* @param {number} x
* @param {number} y
* @param {number} width
* @param {number} height
* @param {object} [options]
* @return {body} A new rectangle body
*/
Bodies.rectangle = function(x, y, width, height, options) {
options = options || {};
var rectangle = {
label: 'Rectangle Body',
position: { x: x, y: y },
vertices: Vertices.fromPath('L 0 0 L ' + width + ' 0 L ' + width + ' ' + height + ' L 0 ' + height)
};
if (options.chamfer) {
var chamfer = options.chamfer;
rectangle.vertices = Vertices.chamfer(rectangle.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, rectangle, options));
};
/**
* Creates a new rigid body model with a trapezoid hull.
* The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method trapezoid
* @param {number} x
* @param {number} y
* @param {number} width
* @param {number} height
* @param {number} slope
* @param {object} [options]
* @return {body} A new trapezoid body
*/
Bodies.trapezoid = function(x, y, width, height, slope, options) {
options = options || {};
slope *= 0.5;
var roof = (1 - (slope * 2)) * width;
var x1 = width * slope,
x2 = x1 + roof,
x3 = x2 + x1,
verticesPath;
if (slope < 0.5) {
verticesPath = 'L 0 0 L ' + x1 + ' ' + (-height) + ' L ' + x2 + ' ' + (-height) + ' L ' + x3 + ' 0';
} else {
verticesPath = 'L 0 0 L ' + x2 + ' ' + (-height) + ' L ' + x3 + ' 0';
}
var trapezoid = {
label: 'Trapezoid Body',
position: { x: x, y: y },
vertices: Vertices.fromPath(verticesPath)
};
if (options.chamfer) {
var chamfer = options.chamfer;
trapezoid.vertices = Vertices.chamfer(trapezoid.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, trapezoid, options));
};
/**
* Creates a new rigid body model with a circle hull.
* The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method circle
* @param {number} x
* @param {number} y
* @param {number} radius
* @param {object} [options]
* @param {number} [maxSides]
* @return {body} A new circle body
*/
Bodies.circle = function(x, y, radius, options, maxSides) {
options = options || {};
var circle = {
label: 'Circle Body',
circleRadius: radius
};
// approximate circles with polygons until true circles implemented in SAT
maxSides = maxSides || 25;
var sides = Math.ceil(Math.max(10, Math.min(maxSides, radius)));
// optimisation: always use even number of sides (half the number of unique axes)
if (sides % 2 === 1)
sides += 1;
return Bodies.polygon(x, y, sides, radius, Common.extend({}, circle, options));
};
/**
* Creates a new rigid body model with a regular polygon hull with the given number of sides.
* The options parameter is an object that specifies any properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method polygon
* @param {number} x
* @param {number} y
* @param {number} sides
* @param {number} radius
* @param {object} [options]
* @return {body} A new regular polygon body
*/
Bodies.polygon = function(x, y, sides, radius, options) {
options = options || {};
if (sides < 3)
return Bodies.circle(x, y, radius, options);
var theta = 2 * Math.PI / sides,
path = '',
offset = theta * 0.5;
for (var i = 0; i < sides; i += 1) {
var angle = offset + (i * theta),
xx = Math.cos(angle) * radius,
yy = Math.sin(angle) * radius;
path += 'L ' + xx.toFixed(3) + ' ' + yy.toFixed(3) + ' ';
}
var polygon = {
label: 'Polygon Body',
position: { x: x, y: y },
vertices: Vertices.fromPath(path)
};
if (options.chamfer) {
var chamfer = options.chamfer;
polygon.vertices = Vertices.chamfer(polygon.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, polygon, options));
};
/**
* Creates a body using the supplied vertices (or an array containing multiple sets of vertices).
* If the vertices are convex, they will pass through as supplied.
* Otherwise if the vertices are concave, they will be decomposed if [poly-decomp.js](https://github.com/schteppe/poly-decomp.js) is available.
* Note that this process is not guaranteed to support complex sets of vertices (e.g. those with holes may fail).
* By default the decomposition will discard collinear edges (to improve performance).
* It can also optionally discard any parts that have an area less than `minimumArea`.
* If the vertices can not be decomposed, the result will fall back to using the convex hull.
* The options parameter is an object that specifies any `Matter.Body` properties you wish to override the defaults.
* See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
* @method fromVertices
* @param {number} x
* @param {number} y
* @param [[vector]] vertexSets
* @param {object} [options]
* @param {bool} [flagInternal=false]
* @param {number} [removeCollinear=0.01]
* @param {number} [minimumArea=10]
* @return {body}
*/
Bodies.fromVertices = function(x, y, vertexSets, options, flagInternal, removeCollinear, minimumArea) {
var body,
parts,
isConvex,
vertices,
i,
j,
k,
v,
z;
options = options || {};
parts = [];
flagInternal = typeof flagInternal !== 'undefined' ? flagInternal : false;
removeCollinear = typeof removeCollinear !== 'undefined' ? removeCollinear : 0.01;
minimumArea = typeof minimumArea !== 'undefined' ? minimumArea : 10;
if (!decomp) {
Common.warn('Bodies.fromVertices: poly-decomp.js required. Could not decompose vertices. Fallback to convex hull.');
}
// ensure vertexSets is an array of arrays
if (!Common.isArray(vertexSets[0])) {
vertexSets = [vertexSets];
}
for (v = 0; v < vertexSets.length; v += 1) {
vertices = vertexSets[v];
isConvex = Vertices.isConvex(vertices);
if (isConvex || !decomp) {
if (isConvex) {
vertices = Vertices.clockwiseSort(vertices);
} else {
// fallback to convex hull when decomposition is not possible
vertices = Vertices.hull(vertices);
}
parts.push({
position: { x: x, y: y },
vertices: vertices
});
} else {
// initialise a decomposition
var concave = vertices.map(function(vertex) {
return [vertex.x, vertex.y];
});
// vertices are concave and simple, we can decompose into parts
decomp.makeCCW(concave);
if (removeCollinear !== false)
decomp.removeCollinearPoints(concave, removeCollinear);
// use the quick decomposition algorithm (Bayazit)
var decomposed = decomp.quickDecomp(concave);
// for each decomposed chunk
for (i = 0; i < decomposed.length; i++) {
var chunk = decomposed[i];
// convert vertices into the correct structure
var chunkVertices = chunk.map(function(vertices) {
return {
x: vertices[0],
y: vertices[1]
};
});
// skip small chunks
if (minimumArea > 0 && Vertices.area(chunkVertices) < minimumArea)
continue;
// create a compound part
parts.push({
position: Vertices.centre(chunkVertices),
vertices: chunkVertices
});
}
}
}
// create body parts
for (i = 0; i < parts.length; i++) {
parts[i] = Body.create(Common.extend(parts[i], options));
}
// flag internal edges (coincident part edges)
if (flagInternal) {
var coincident_max_dist = 5;
for (i = 0; i < parts.length; i++) {
var partA = parts[i];
for (j = i + 1; j < parts.length; j++) {
var partB = parts[j];
if (Bounds.overlaps(partA.bounds, partB.bounds)) {
var pav = partA.vertices,
pbv = partB.vertices;
// iterate vertices of both parts
for (k = 0; k < partA.vertices.length; k++) {
for (z = 0; z < partB.vertices.length; z++) {
// find distances between the vertices
var da = Vector.magnitudeSquared(Vector.sub(pav[(k + 1) % pav.length], pbv[z])),
db = Vector.magnitudeSquared(Vector.sub(pav[k], pbv[(z + 1) % pbv.length]));
// if both vertices are very close, consider the edge concident (internal)
if (da < coincident_max_dist && db < coincident_max_dist) {
pav[k].isInternal = true;
pbv[z].isInternal = true;
}
}
}
}
}
}
}
if (parts.length > 1) {
// create the parent body to be returned, that contains generated compound parts
body = Body.create(Common.extend({ parts: parts.slice(0) }, options));
Body.setPosition(body, { x: x, y: y });
return body;
} else {
return parts[0];
}
};
})();
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"../body/Body":1,"../core/Common":14,"../geometry/Bounds":26,"../geometry/Vector":28,"../geometry/Vertices":29}],24:[function(_dereq_,module,exports){
/**
* The `Matter.Composites` module contains factory methods for creating composite bodies
* with commonly used configurations (such as stacks and chains).
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Composites
*/
var Composites = {};
module.exports = Composites;
var Composite = _dereq_('../body/Composite');
var Constraint = _dereq_('../constraint/Constraint');
var Common = _dereq_('../core/Common');
var Body = _dereq_('../body/Body');
var Bodies = _dereq_('./Bodies');
(function() {
/**
* Create a new composite containing bodies created in the callback in a grid arrangement.
* This function uses the body's bounds to prevent overlaps.
* @method stack
* @param {number} xx
* @param {number} yy
* @param {number} columns
* @param {number} rows
* @param {number} columnGap
* @param {number} rowGap
* @param {function} callback
* @return {composite} A new composite containing objects created in the callback
*/
Composites.stack = function(xx, yy, columns, rows, columnGap, rowGap, callback) {
var stack = Composite.create({ label: 'Stack' }),
x = xx,
y = yy,
lastBody,
i = 0;
for (var row = 0; row < rows; row++) {
var maxHeight = 0;
for (var column = 0; column < columns; column++) {
var body = callback(x, y, column, row, lastBody, i);
if (body) {
var bodyHeight = body.bounds.max.y - body.bounds.min.y,
bodyWidth = body.bounds.max.x - body.bounds.min.x;
if (bodyHeight > maxHeight)
maxHeight = bodyHeight;
Body.translate(body, { x: bodyWidth * 0.5, y: bodyHeight * 0.5 });
x = body.bounds.max.x + columnGap;
Composite.addBody(stack, body);
lastBody = body;
i += 1;
} else {
x += columnGap;
}
}
y += maxHeight + rowGap;
x = xx;
}
return stack;
};
/**
* Chains all bodies in the given composite together using constraints.
* @method chain
* @param {composite} composite
* @param {number} xOffsetA
* @param {number} yOffsetA
* @param {number} xOffsetB
* @param {number} yOffsetB
* @param {object} options
* @return {composite} A new composite containing objects chained together with constraints
*/
Composites.chain = function(composite, xOffsetA, yOffsetA, xOffsetB, yOffsetB, options) {
var bodies = composite.bodies;
for (var i = 1; i < bodies.length; i++) {
var bodyA = bodies[i - 1],
bodyB = bodies[i],
bodyAHeight = bodyA.bounds.max.y - bodyA.bounds.min.y,
bodyAWidth = bodyA.bounds.max.x - bodyA.bounds.min.x,
bodyBHeight = bodyB.bounds.max.y - bodyB.bounds.min.y,
bodyBWidth = bodyB.bounds.max.x - bodyB.bounds.min.x;
var defaults = {
bodyA: bodyA,
pointA: { x: bodyAWidth * xOffsetA, y: bodyAHeight * yOffsetA },
bodyB: bodyB,
pointB: { x: bodyBWidth * xOffsetB, y: bodyBHeight * yOffsetB }
};
var constraint = Common.extend(defaults, options);
Composite.addConstraint(composite, Constraint.create(constraint));
}
composite.label += ' Chain';
return composite;
};
/**
* Connects bodies in the composite with constraints in a grid pattern, with optional cross braces.
* @method mesh
* @param {composite} composite
* @param {number} columns
* @param {number} rows
* @param {boolean} crossBrace
* @param {object} options
* @return {composite} The composite containing objects meshed together with constraints
*/
Composites.mesh = function(composite, columns, rows, crossBrace, options) {
var bodies = composite.bodies,
row,
col,
bodyA,
bodyB,
bodyC;
for (row = 0; row < rows; row++) {
for (col = 1; col < columns; col++) {
bodyA = bodies[(col - 1) + (row * columns)];
bodyB = bodies[col + (row * columns)];
Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyA, bodyB: bodyB }, options)));
}
if (row > 0) {
for (col = 0; col < columns; col++) {
bodyA = bodies[col + ((row - 1) * columns)];
bodyB = bodies[col + (row * columns)];
Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyA, bodyB: bodyB }, options)));
if (crossBrace && col > 0) {
bodyC = bodies[(col - 1) + ((row - 1) * columns)];
Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyC, bodyB: bodyB }, options)));
}
if (crossBrace && col < columns - 1) {
bodyC = bodies[(col + 1) + ((row - 1) * columns)];
Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyC, bodyB: bodyB }, options)));
}
}
}
}
composite.label += ' Mesh';
return composite;
};
/**
* Create a new composite containing bodies created in the callback in a pyramid arrangement.
* This function uses the body's bounds to prevent overlaps.
* @method pyramid
* @param {number} xx
* @param {number} yy
* @param {number} columns
* @param {number} rows
* @param {number} columnGap
* @param {number} rowGap
* @param {function} callback
* @return {composite} A new composite containing objects created in the callback
*/
Composites.pyramid = function(xx, yy, columns, rows, columnGap, rowGap, callback) {
return Composites.stack(xx, yy, columns, rows, columnGap, rowGap, function(x, y, column, row, lastBody, i) {
var actualRows = Math.min(rows, Math.ceil(columns / 2)),
lastBodyWidth = lastBody ? lastBody.bounds.max.x - lastBody.bounds.min.x : 0;
if (row > actualRows)
return;
// reverse row order
row = actualRows - row;
var start = row,
end = columns - 1 - row;
if (column < start || column > end)
return;
// retroactively fix the first body's position, since width was unknown
if (i === 1) {
Body.translate(lastBody, { x: (column + (columns % 2 === 1 ? 1 : -1)) * lastBodyWidth, y: 0 });
}
var xOffset = lastBody ? column * lastBodyWidth : 0;
return callback(xx + xOffset + column * columnGap, y, column, row, lastBody, i);
});
};
/**
* Creates a composite with a Newton's Cradle setup of bodies and constraints.
* @method newtonsCradle
* @param {number} xx
* @param {number} yy
* @param {number} number
* @param {number} size
* @param {number} length
* @return {composite} A new composite newtonsCradle body
*/
Composites.newtonsCradle = function(xx, yy, number, size, length) {
var newtonsCradle = Composite.create({ label: 'Newtons Cradle' });
for (var i = 0; i < number; i++) {
var separation = 1.9,
circle = Bodies.circle(xx + i * (size * separation), yy + length, size,
{ inertia: Infinity, restitution: 1, friction: 0, frictionAir: 0.0001, slop: 1 }),
constraint = Constraint.create({ pointA: { x: xx + i * (size * separation), y: yy }, bodyB: circle });
Composite.addBody(newtonsCradle, circle);
Composite.addConstraint(newtonsCradle, constraint);
}
return newtonsCradle;
};
/**
* Creates a composite with simple car setup of bodies and constraints.
* @method car
* @param {number} xx
* @param {number} yy
* @param {number} width
* @param {number} height
* @param {number} wheelSize
* @return {composite} A new composite car body
*/
Composites.car = function(xx, yy, width, height, wheelSize) {
var group = Body.nextGroup(true),
wheelBase = 20,
wheelAOffset = -width * 0.5 + wheelBase,
wheelBOffset = width * 0.5 - wheelBase,
wheelYOffset = 0;
var car = Composite.create({ label: 'Car' }),
body = Bodies.rectangle(xx, yy, width, height, {
collisionFilter: {
group: group
},
chamfer: {
radius: height * 0.5
},
density: 0.0002
});
var wheelA = Bodies.circle(xx + wheelAOffset, yy + wheelYOffset, wheelSize, {
collisionFilter: {
group: group
},
friction: 0.8
});
var wheelB = Bodies.circle(xx + wheelBOffset, yy + wheelYOffset, wheelSize, {
collisionFilter: {
group: group
},
friction: 0.8
});
var axelA = Constraint.create({
bodyB: body,
pointB: { x: wheelAOffset, y: wheelYOffset },
bodyA: wheelA,
stiffness: 1,
length: 0
});
var axelB = Constraint.create({
bodyB: body,
pointB: { x: wheelBOffset, y: wheelYOffset },
bodyA: wheelB,
stiffness: 1,
length: 0
});
Composite.addBody(car, body);
Composite.addBody(car, wheelA);
Composite.addBody(car, wheelB);
Composite.addConstraint(car, axelA);
Composite.addConstraint(car, axelB);
return car;
};
/**
* Creates a simple soft body like object.
* @method softBody
* @param {number} xx
* @param {number} yy
* @param {number} columns
* @param {number} rows
* @param {number} columnGap
* @param {number} rowGap
* @param {boolean} crossBrace
* @param {number} particleRadius
* @param {} particleOptions
* @param {} constraintOptions
* @return {composite} A new composite softBody
*/
Composites.softBody = function(xx, yy, columns, rows, columnGap, rowGap, crossBrace, particleRadius, particleOptions, constraintOptions) {
particleOptions = Common.extend({ inertia: Infinity }, particleOptions);
constraintOptions = Common.extend({ stiffness: 0.2, render: { type: 'line', anchors: false } }, constraintOptions);
var softBody = Composites.stack(xx, yy, columns, rows, columnGap, rowGap, function(x, y) {
return Bodies.circle(x, y, particleRadius, particleOptions);
});
Composites.mesh(softBody, columns, rows, crossBrace, constraintOptions);
softBody.label = 'Soft Body';
return softBody;
};
})();
},{"../body/Body":1,"../body/Composite":2,"../constraint/Constraint":12,"../core/Common":14,"./Bodies":23}],25:[function(_dereq_,module,exports){
/**
* The `Matter.Axes` module contains methods for creating and manipulating sets of axes.
*
* @class Axes
*/
var Axes = {};
module.exports = Axes;
var Vector = _dereq_('../geometry/Vector');
var Common = _dereq_('../core/Common');
(function() {
/**
* Creates a new set of axes from the given vertices.
* @method fromVertices
* @param {vertices} vertices
* @return {axes} A new axes from the given vertices
*/
Axes.fromVertices = function(vertices) {
var axes = {};
// find the unique axes, using edge normal gradients
for (var i = 0; i < vertices.length; i++) {
var j = (i + 1) % vertices.length,
normal = Vector.normalise({
x: vertices[j].y - vertices[i].y,
y: vertices[i].x - vertices[j].x
}),
gradient = (normal.y === 0) ? Infinity : (normal.x / normal.y);
// limit precision
gradient = gradient.toFixed(3).toString();
axes[gradient] = normal;
}
return Common.values(axes);
};
/**
* Rotates a set of axes by the given angle.
* @method rotate
* @param {axes} axes
* @param {number} angle
*/
Axes.rotate = function(axes, angle) {
if (angle === 0)
return;
var cos = Math.cos(angle),
sin = Math.sin(angle);
for (var i = 0; i < axes.length; i++) {
var axis = axes[i],
xx;
xx = axis.x * cos - axis.y * sin;
axis.y = axis.x * sin + axis.y * cos;
axis.x = xx;
}
};
})();
},{"../core/Common":14,"../geometry/Vector":28}],26:[function(_dereq_,module,exports){
/**
* The `Matter.Bounds` module contains methods for creating and manipulating axis-aligned bounding boxes (AABB).
*
* @class Bounds
*/
var Bounds = {};
module.exports = Bounds;
(function() {
/**
* Creates a new axis-aligned bounding box (AABB) for the given vertices.
* @method create
* @param {vertices} vertices
* @return {bounds} A new bounds object
*/
Bounds.create = function(vertices) {
var bounds = {
min: { x: 0, y: 0 },
max: { x: 0, y: 0 }
};
if (vertices)
Bounds.update(bounds, vertices);
return bounds;
};
/**
* Updates bounds using the given vertices and extends the bounds given a velocity.
* @method update
* @param {bounds} bounds
* @param {vertices} vertices
* @param {vector} velocity
*/
Bounds.update = function(bounds, vertices, velocity) {
bounds.min.x = Infinity;
bounds.max.x = -Infinity;
bounds.min.y = Infinity;
bounds.max.y = -Infinity;
for (var i = 0; i < vertices.length; i++) {
var vertex = vertices[i];
if (vertex.x > bounds.max.x) bounds.max.x = vertex.x;
if (vertex.x < bounds.min.x) bounds.min.x = vertex.x;
if (vertex.y > bounds.max.y) bounds.max.y = vertex.y;
if (vertex.y < bounds.min.y) bounds.min.y = vertex.y;
}
if (velocity) {
if (velocity.x > 0) {
bounds.max.x += velocity.x;
} else {
bounds.min.x += velocity.x;
}
if (velocity.y > 0) {
bounds.max.y += velocity.y;
} else {
bounds.min.y += velocity.y;
}
}
};
/**
* Returns true if the bounds contains the given point.
* @method contains
* @param {bounds} bounds
* @param {vector} point
* @return {boolean} True if the bounds contain the point, otherwise false
*/
Bounds.contains = function(bounds, point) {
return point.x >= bounds.min.x && point.x <= bounds.max.x
&& point.y >= bounds.min.y && point.y <= bounds.max.y;
};
/**
* Returns true if the two bounds intersect.
* @method overlaps
* @param {bounds} boundsA
* @param {bounds} boundsB
* @return {boolean} True if the bounds overlap, otherwise false
*/
Bounds.overlaps = function(boundsA, boundsB) {
return (boundsA.min.x <= boundsB.max.x && boundsA.max.x >= boundsB.min.x
&& boundsA.max.y >= boundsB.min.y && boundsA.min.y <= boundsB.max.y);
};
/**
* Translates the bounds by the given vector.
* @method translate
* @param {bounds} bounds
* @param {vector} vector
*/
Bounds.translate = function(bounds, vector) {
bounds.min.x += vector.x;
bounds.max.x += vector.x;
bounds.min.y += vector.y;
bounds.max.y += vector.y;
};
/**
* Shifts the bounds to the given position.
* @method shift
* @param {bounds} bounds
* @param {vector} position
*/
Bounds.shift = function(bounds, position) {
var deltaX = bounds.max.x - bounds.min.x,
deltaY = bounds.max.y - bounds.min.y;
bounds.min.x = position.x;
bounds.max.x = position.x + deltaX;
bounds.min.y = position.y;
bounds.max.y = position.y + deltaY;
};
})();
},{}],27:[function(_dereq_,module,exports){
/**
* The `Matter.Svg` module contains methods for converting SVG images into an array of vector points.
*
* To use this module you also need the SVGPathSeg polyfill: https://github.com/progers/pathseg
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Svg
*/
var Svg = {};
module.exports = Svg;
var Bounds = _dereq_('../geometry/Bounds');
(function() {
/**
* Converts an SVG path into an array of vector points.
* If the input path forms a concave shape, you must decompose the result into convex parts before use.
* See `Bodies.fromVertices` which provides support for this.
* Note that this function is not guaranteed to support complex paths (such as those with holes).
* @method pathToVertices
* @param {SVGPathElement} path
* @param {Number} [sampleLength=15]
* @return {Vector[]} points
*/
Svg.pathToVertices = function(path, sampleLength) {
// https://github.com/wout/svg.topoly.js/blob/master/svg.topoly.js
var i, il, total, point, segment, segments,
segmentsQueue, lastSegment,
lastPoint, segmentIndex, points = [],
lx, ly, length = 0, x = 0, y = 0;
sampleLength = sampleLength || 15;
var addPoint = function(px, py, pathSegType) {
// all odd-numbered path types are relative except PATHSEG_CLOSEPATH (1)
var isRelative = pathSegType % 2 === 1 && pathSegType > 1;
// when the last point doesn't equal the current point add the current point
if (!lastPoint || px != lastPoint.x || py != lastPoint.y) {
if (lastPoint && isRelative) {
lx = lastPoint.x;
ly = lastPoint.y;
} else {
lx = 0;
ly = 0;
}
var point = {
x: lx + px,
y: ly + py
};
// set last point
if (isRelative || !lastPoint) {
lastPoint = point;
}
points.push(point);
x = lx + px;
y = ly + py;
}
};
var addSegmentPoint = function(segment) {
var segType = segment.pathSegTypeAsLetter.toUpperCase();
// skip path ends
if (segType === 'Z')
return;
// map segment to x and y
switch (segType) {
case 'M':
case 'L':
case 'T':
case 'C':
case 'S':
case 'Q':
x = segment.x;
y = segment.y;
break;
case 'H':
x = segment.x;
break;
case 'V':
y = segment.y;
break;
}
addPoint(x, y, segment.pathSegType);
};
// ensure path is absolute
_svgPathToAbsolute(path);
// get total length
total = path.getTotalLength();
// queue segments
segments = [];
for (i = 0; i < path.pathSegList.numberOfItems; i += 1)
segments.push(path.pathSegList.getItem(i));
segmentsQueue = segments.concat();
// sample through path
while (length < total) {
// get segment at position
segmentIndex = path.getPathSegAtLength(length);
segment = segments[segmentIndex];
// new segment
if (segment != lastSegment) {
while (segmentsQueue.length && segmentsQueue[0] != segment)
addSegmentPoint(segmentsQueue.shift());
lastSegment = segment;
}
// add points in between when curving
// TODO: adaptive sampling
switch (segment.pathSegTypeAsLetter.toUpperCase()) {
case 'C':
case 'T':
case 'S':
case 'Q':
case 'A':
point = path.getPointAtLength(length);
addPoint(point.x, point.y, 0);
break;
}
// increment by sample value
length += sampleLength;
}
// add remaining segments not passed by sampling
for (i = 0, il = segmentsQueue.length; i < il; ++i)
addSegmentPoint(segmentsQueue[i]);
return points;
};
var _svgPathToAbsolute = function(path) {
// http://phrogz.net/convert-svg-path-to-all-absolute-commands
// Copyright (c) Gavin Kistner
// http://phrogz.net/js/_ReuseLicense.txt
// Modifications: tidy formatting and naming
var x0, y0, x1, y1, x2, y2, segs = path.pathSegList,
x = 0, y = 0, len = segs.numberOfItems;
for (var i = 0; i < len; ++i) {
var seg = segs.getItem(i),
segType = seg.pathSegTypeAsLetter;
if (/[MLHVCSQTA]/.test(segType)) {
if ('x' in seg) x = seg.x;
if ('y' in seg) y = seg.y;
} else {
if ('x1' in seg) x1 = x + seg.x1;
if ('x2' in seg) x2 = x + seg.x2;
if ('y1' in seg) y1 = y + seg.y1;
if ('y2' in seg) y2 = y + seg.y2;
if ('x' in seg) x += seg.x;
if ('y' in seg) y += seg.y;
switch (segType) {
case 'm':
segs.replaceItem(path.createSVGPathSegMovetoAbs(x, y), i);
break;
case 'l':
segs.replaceItem(path.createSVGPathSegLinetoAbs(x, y), i);
break;
case 'h':
segs.replaceItem(path.createSVGPathSegLinetoHorizontalAbs(x), i);
break;
case 'v':
segs.replaceItem(path.createSVGPathSegLinetoVerticalAbs(y), i);
break;
case 'c':
segs.replaceItem(path.createSVGPathSegCurvetoCubicAbs(x, y, x1, y1, x2, y2), i);
break;
case 's':
segs.replaceItem(path.createSVGPathSegCurvetoCubicSmoothAbs(x, y, x2, y2), i);
break;
case 'q':
segs.replaceItem(path.createSVGPathSegCurvetoQuadraticAbs(x, y, x1, y1), i);
break;
case 't':
segs.replaceItem(path.createSVGPathSegCurvetoQuadraticSmoothAbs(x, y), i);
break;
case 'a':
segs.replaceItem(path.createSVGPathSegArcAbs(x, y, seg.r1, seg.r2, seg.angle, seg.largeArcFlag, seg.sweepFlag), i);
break;
case 'z':
case 'Z':
x = x0;
y = y0;
break;
}
}
if (segType == 'M' || segType == 'm') {
x0 = x;
y0 = y;
}
}
};
})();
},{"../geometry/Bounds":26}],28:[function(_dereq_,module,exports){
/**
* The `Matter.Vector` module contains methods for creating and manipulating vectors.
* Vectors are the basis of all the geometry related operations in the engine.
* A `Matter.Vector` object is of the form `{ x: 0, y: 0 }`.
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Vector
*/
// TODO: consider params for reusing vector objects
var Vector = {};
module.exports = Vector;
(function() {
/**
* Creates a new vector.
* @method create
* @param {number} x
* @param {number} y
* @return {vector} A new vector
*/
Vector.create = function(x, y) {
return { x: x || 0, y: y || 0 };
};
/**
* Returns a new vector with `x` and `y` copied from the given `vector`.
* @method clone
* @param {vector} vector
* @return {vector} A new cloned vector
*/
Vector.clone = function(vector) {
return { x: vector.x, y: vector.y };
};
/**
* Returns the magnitude (length) of a vector.
* @method magnitude
* @param {vector} vector
* @return {number} The magnitude of the vector
*/
Vector.magnitude = function(vector) {
return Math.sqrt((vector.x * vector.x) + (vector.y * vector.y));
};
/**
* Returns the magnitude (length) of a vector (therefore saving a `sqrt` operation).
* @method magnitudeSquared
* @param {vector} vector
* @return {number} The squared magnitude of the vector
*/
Vector.magnitudeSquared = function(vector) {
return (vector.x * vector.x) + (vector.y * vector.y);
};
/**
* Rotates the vector about (0, 0) by specified angle.
* @method rotate
* @param {vector} vector
* @param {number} angle
* @param {vector} [output]
* @return {vector} The vector rotated about (0, 0)
*/
Vector.rotate = function(vector, angle, output) {
var cos = Math.cos(angle), sin = Math.sin(angle);
if (!output) output = {};
var x = vector.x * cos - vector.y * sin;
output.y = vector.x * sin + vector.y * cos;
output.x = x;
return output;
};
/**
* Rotates the vector about a specified point by specified angle.
* @method rotateAbout
* @param {vector} vector
* @param {number} angle
* @param {vector} point
* @param {vector} [output]
* @return {vector} A new vector rotated about the point
*/
Vector.rotateAbout = function(vector, angle, point, output) {
var cos = Math.cos(angle), sin = Math.sin(angle);
if (!output) output = {};
var x = point.x + ((vector.x - point.x) * cos - (vector.y - point.y) * sin);
output.y = point.y + ((vector.x - point.x) * sin + (vector.y - point.y) * cos);
output.x = x;
return output;
};
/**
* Normalises a vector (such that its magnitude is `1`).
* @method normalise
* @param {vector} vector
* @return {vector} A new vector normalised
*/
Vector.normalise = function(vector) {
var magnitude = Vector.magnitude(vector);
if (magnitude === 0)
return { x: 0, y: 0 };
return { x: vector.x / magnitude, y: vector.y / magnitude };
};
/**
* Returns the dot-product of two vectors.
* @method dot
* @param {vector} vectorA
* @param {vector} vectorB
* @return {number} The dot product of the two vectors
*/
Vector.dot = function(vectorA, vectorB) {
return (vectorA.x * vectorB.x) + (vectorA.y * vectorB.y);
};
/**
* Returns the cross-product of two vectors.
* @method cross
* @param {vector} vectorA
* @param {vector} vectorB
* @return {number} The cross product of the two vectors
*/
Vector.cross = function(vectorA, vectorB) {
return (vectorA.x * vectorB.y) - (vectorA.y * vectorB.x);
};
/**
* Returns the cross-product of three vectors.
* @method cross3
* @param {vector} vectorA
* @param {vector} vectorB
* @param {vector} vectorC
* @return {number} The cross product of the three vectors
*/
Vector.cross3 = function(vectorA, vectorB, vectorC) {
return (vectorB.x - vectorA.x) * (vectorC.y - vectorA.y) - (vectorB.y - vectorA.y) * (vectorC.x - vectorA.x);
};
/**
* Adds the two vectors.
* @method add
* @param {vector} vectorA
* @param {vector} vectorB
* @param {vector} [output]
* @return {vector} A new vector of vectorA and vectorB added
*/
Vector.add = function(vectorA, vectorB, output) {
if (!output) output = {};
output.x = vectorA.x + vectorB.x;
output.y = vectorA.y + vectorB.y;
return output;
};
/**
* Subtracts the two vectors.
* @method sub
* @param {vector} vectorA
* @param {vector} vectorB
* @param {vector} [output]
* @return {vector} A new vector of vectorA and vectorB subtracted
*/
Vector.sub = function(vectorA, vectorB, output) {
if (!output) output = {};
output.x = vectorA.x - vectorB.x;
output.y = vectorA.y - vectorB.y;
return output;
};
/**
* Multiplies a vector and a scalar.
* @method mult
* @param {vector} vector
* @param {number} scalar
* @return {vector} A new vector multiplied by scalar
*/
Vector.mult = function(vector, scalar) {
return { x: vector.x * scalar, y: vector.y * scalar };
};
/**
* Divides a vector and a scalar.
* @method div
* @param {vector} vector
* @param {number} scalar
* @return {vector} A new vector divided by scalar
*/
Vector.div = function(vector, scalar) {
return { x: vector.x / scalar, y: vector.y / scalar };
};
/**
* Returns the perpendicular vector. Set `negate` to true for the perpendicular in the opposite direction.
* @method perp
* @param {vector} vector
* @param {bool} [negate=false]
* @return {vector} The perpendicular vector
*/
Vector.perp = function(vector, negate) {
negate = negate === true ? -1 : 1;
return { x: negate * -vector.y, y: negate * vector.x };
};
/**
* Negates both components of a vector such that it points in the opposite direction.
* @method neg
* @param {vector} vector
* @return {vector} The negated vector
*/
Vector.neg = function(vector) {
return { x: -vector.x, y: -vector.y };
};
/**
* Returns the angle in radians between the two vectors relative to the x-axis.
* @method angle
* @param {vector} vectorA
* @param {vector} vectorB
* @return {number} The angle in radians
*/
Vector.angle = function(vectorA, vectorB) {
return Math.atan2(vectorB.y - vectorA.y, vectorB.x - vectorA.x);
};
/**
* Temporary vector pool (not thread-safe).
* @property _temp
* @type {vector[]}
* @private
*/
Vector._temp = [
Vector.create(), Vector.create(),
Vector.create(), Vector.create(),
Vector.create(), Vector.create()
];
})();
},{}],29:[function(_dereq_,module,exports){
/**
* The `Matter.Vertices` module contains methods for creating and manipulating sets of vertices.
* A set of vertices is an array of `Matter.Vector` with additional indexing properties inserted by `Vertices.create`.
* A `Matter.Body` maintains a set of vertices to represent the shape of the object (its convex hull).
*
* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).
*
* @class Vertices
*/
var Vertices = {};
module.exports = Vertices;
var Vector = _dereq_('../geometry/Vector');
var Common = _dereq_('../core/Common');
(function() {
/**
* Creates a new set of `Matter.Body` compatible vertices.
* The `points` argument accepts an array of `Matter.Vector` points orientated around the origin `(0, 0)`, for example:
*
* [{ x: 0, y: 0 }, { x: 25, y: 50 }, { x: 50, y: 0 }]
*
* The `Vertices.create` method returns a new array of vertices, which are similar to Matter.Vector objects,
* but with some additional references required for efficient collision detection routines.
*
* Vertices must be specified in clockwise order.
*
* Note that the `body` argument is not optional, a `Matter.Body` reference must be provided.
*
* @method create
* @param {vector[]} points
* @param {body} body
*/
Vertices.create = function(points, body) {
var vertices = [];
for (var i = 0; i < points.length; i++) {
var point = points[i],
vertex = {
x: point.x,
y: point.y,
index: i,
body: body,
isInternal: false
};
vertices.push(vertex);
}
return vertices;
};
/**
* Parses a string containing ordered x y pairs separated by spaces (and optionally commas),
* into a `Matter.Vertices` object for the given `Matter.Body`.
* For parsing SVG paths, see `Svg.pathToVertices`.
* @method fromPath
* @param {string} path
* @param {body} body
* @return {vertices} vertices
*/
Vertices.fromPath = function(path, body) {
var pathPattern = /L?\s*([\-\d\.e]+)[\s,]*([\-\d\.e]+)*/ig,
points = [];
path.replace(pathPattern, function(match, x, y) {
points.push({ x: parseFloat(x), y: parseFloat(y) });
});
return Vertices.create(points, body);
};
/**
* Returns the centre (centroid) of the set of vertices.
* @method centre
* @param {vertices} vertices
* @return {vector} The centre point
*/
Vertices.centre = function(vertices) {
var area = Vertices.area(vertices, true),
centre = { x: 0, y: 0 },
cross,
temp,
j;
for (var i = 0; i < vertices.length; i++) {
j = (i + 1) % vertices.length;
cross = Vector.cross(vertices[i], vertices[j]);
temp = Vector.mult(Vector.add(vertices[i], vertices[j]), cross);
centre = Vector.add(centre, temp);
}
return Vector.div(centre, 6 * area);
};
/**
* Returns the average (mean) of the set of vertices.
* @method mean
* @param {vertices} vertices
* @return {vector} The average point
*/
Vertices.mean = function(vertices) {
var average = { x: 0, y: 0 };
for (var i = 0; i < vertices.length; i++) {
average.x += vertices[i].x;
average.y += vertices[i].y;
}
return Vector.div(average, vertices.length);
};
/**
* Returns the area of the set of vertices.
* @method area
* @param {vertices} vertices
* @param {bool} signed
* @return {number} The area
*/
Vertices.area = function(vertices, signed) {
var area = 0,
j = vertices.length - 1;
for (var i = 0; i < vertices.length; i++) {
area += (vertices[j].x - vertices[i].x) * (vertices[j].y + vertices[i].y);
j = i;
}
if (signed)
return area / 2;
return Math.abs(area) / 2;
};
/**
* Returns the moment of inertia (second moment of area) of the set of vertices given the total mass.
* @method inertia
* @param {vertices} vertices
* @param {number} mass
* @return {number} The polygon's moment of inertia
*/
Vertices.inertia = function(vertices, mass) {
var numerator = 0,
denominator = 0,
v = vertices,
cross,
j;
// find the polygon's moment of inertia, using second moment of area
// from equations at http://www.physicsforums.com/showthread.php?t=25293
for (var n = 0; n < v.length; n++) {
j = (n + 1) % v.length;
cross = Math.abs(Vector.cross(v[j], v[n]));
numerator += cross * (Vector.dot(v[j], v[j]) + Vector.dot(v[j], v[n]) + Vector.dot(v[n], v[n]));
denominator += cross;
}
return (mass / 6) * (numerator / denominator);
};
/**
* Translates the set of vertices in-place.
* @method translate
* @param {vertices} vertices
* @param {vector} vector
* @param {number} scalar
*/
Vertices.translate = function(vertices, vector, scalar) {
var i;
if (scalar) {
for (i = 0; i < vertices.length; i++) {
vertices[i].x += vector.x * scalar;
vertices[i].y += vector.y * scalar;
}
} else {
for (i = 0; i < vertices.length; i++) {
vertices[i].x += vector.x;
vertices[i].y += vector.y;
}
}
return vertices;
};
/**
* Rotates the set of vertices in-place.
* @method rotate
* @param {vertices} vertices
* @param {number} angle
* @param {vector} point
*/
Vertices.rotate = function(vertices, angle, point) {
if (angle === 0)
return;
var cos = Math.cos(angle),
sin = Math.sin(angle);
for (var i = 0; i < vertices.length; i++) {
var vertice = vertices[i],
dx = vertice.x - point.x,
dy = vertice.y - point.y;
vertice.x = point.x + (dx * cos - dy * sin);
vertice.y = point.y + (dx * sin + dy * cos);
}
return vertices;
};
/**
* Returns `true` if the `point` is inside the set of `vertices`.
* @method contains
* @param {vertices} vertices
* @param {vector} point
* @return {boolean} True if the vertices contains point, otherwise false
*/
Vertices.contains = function(vertices, point) {
for (var i = 0; i < vertices.length; i++) {
var vertice = vertices[i],
nextVertice = vertices[(i + 1) % vertices.length];
if ((point.x - vertice.x) * (nextVertice.y - vertice.y) + (point.y - vertice.y) * (vertice.x - nextVertice.x) > 0) {
return false;
}
}
return true;
};
/**
* Scales the vertices from a point (default is centre) in-place.
* @method scale
* @param {vertices} vertices
* @param {number} scaleX
* @param {number} scaleY
* @param {vector} point
*/
Vertices.scale = function(vertices, scaleX, scaleY, point) {
if (scaleX === 1 && scaleY === 1)
return vertices;
point = point || Vertices.centre(vertices);
var vertex,
delta;
for (var i = 0; i < vertices.length; i++) {
vertex = vertices[i];
delta = Vector.sub(vertex, point);
vertices[i].x = point.x + delta.x * scaleX;
vertices[i].y = point.y + delta.y * scaleY;
}
return vertices;
};
/**
* Chamfers a set of vertices by giving them rounded corners, returns a new set of vertices.
* The radius parameter is a single number or an array to specify the radius for each vertex.
* @method chamfer
* @param {vertices} vertices
* @param {number[]} radius
* @param {number} quality
* @param {number} qualityMin
* @param {number} qualityMax
*/
Vertices.chamfer = function(vertices, radius, quality, qualityMin, qualityMax) {
radius = radius || [8];
if (!radius.length)
radius = [radius];
// quality defaults to -1, which is auto
quality = (typeof quality !== 'undefined') ? quality : -1;
qualityMin = qualityMin || 2;
qualityMax = qualityMax || 14;
var newVertices = [];
for (var i = 0; i < vertices.length; i++) {
var prevVertex = vertices[i - 1 >= 0 ? i - 1 : vertices.length - 1],
vertex = vertices[i],
nextVertex = vertices[(i + 1) % vertices.length],
currentRadius = radius[i < radius.length ? i : radius.length - 1];
if (currentRadius === 0) {
newVertices.push(vertex);
continue;
}
var prevNormal = Vector.normalise({
x: vertex.y - prevVertex.y,
y: prevVertex.x - vertex.x
});
var nextNormal = Vector.normalise({
x: nextVertex.y - vertex.y,
y: vertex.x - nextVertex.x
});
var diagonalRadius = Math.sqrt(2 * Math.pow(currentRadius, 2)),
radiusVector = Vector.mult(Common.clone(prevNormal), currentRadius),
midNormal = Vector.normalise(Vector.mult(Vector.add(prevNormal, nextNormal), 0.5)),
scaledVertex = Vector.sub(vertex, Vector.mult(midNormal, diagonalRadius));
var precision = quality;
if (quality === -1) {
// automatically decide precision
precision = Math.pow(currentRadius, 0.32) * 1.75;
}
precision = Common.clamp(precision, qualityMin, qualityMax);
// use an even value for precision, more likely to reduce axes by using symmetry
if (precision % 2 === 1)
precision += 1;
var alpha = Math.acos(Vector.dot(prevNormal, nextNormal)),
theta = alpha / precision;
for (var j = 0; j < precision; j++) {
newVertices.push(Vector.add(Vector.rotate(radiusVector, theta * j), scaledVertex));
}
}
return newVertices;
};
/**
* Sorts the input vertices into clockwise order in place.
* @method clockwiseSort
* @param {vertices} vertices
* @return {vertices} vertices
*/
Vertices.clockwiseSort = function(vertices) {
var centre = Vertices.mean(vertices);
vertices.sort(function(vertexA, vertexB) {
return Vector.angle(centre, vertexA) - Vector.angle(centre, vertexB);
});
return vertices;
};
/**
* Returns true if the vertices form a convex shape (vertices must be in clockwise order).
* @method isConvex
* @param {vertices} vertices
* @return {bool} `true` if the `vertices` are convex, `false` if not (or `null` if not computable).
*/
Vertices.isConvex = function(vertices) {
// http://paulbourke.net/geometry/polygonmesh/
// Copyright (c) Paul Bourke (use permitted)
var flag = 0,
n = vertices.length,
i,
j,
k,
z;
if (n < 3)
return null;
for (i = 0; i < n; i++) {
j = (i + 1) % n;
k = (i + 2) % n;
z = (vertices[j].x - vertices[i].x) * (vertices[k].y - vertices[j].y);
z -= (vertices[j].y - vertices[i].y) * (vertices[k].x - vertices[j].x);
if (z < 0) {
flag |= 1;
} else if (z > 0) {
flag |= 2;
}
if (flag === 3) {
return false;
}
}
if (flag !== 0){
return true;
} else {
return null;
}
};
/**
* Returns the convex hull of the input vertices as a new array of points.
* @method hull
* @param {vertices} vertices
* @return [vertex] vertices
*/
Vertices.hull = function(vertices) {
// http://geomalgorithms.com/a10-_hull-1.html
var upper = [],
lower = [],
vertex,
i;
// sort vertices on x-axis (y-axis for ties)
vertices = vertices.slice(0);
vertices.sort(function(vertexA, vertexB) {
var dx = vertexA.x - vertexB.x;
return dx !== 0 ? dx : vertexA.y - vertexB.y;
});
// build lower hull
for (i = 0; i < vertices.length; i += 1) {
vertex = vertices[i];
while (lower.length >= 2
&& Vector.cross3(lower[lower.length - 2], lower[lower.length - 1], vertex) <= 0) {
lower.pop();
}
lower.push(vertex);
}
// build upper hull
for (i = vertices.length - 1; i >= 0; i -= 1) {
vertex = vertices[i];
while (upper.length >= 2
&& Vector.cross3(upper[upper.length - 2], upper[upper.length - 1], vertex) <= 0) {
upper.pop();
}
upper.push(vertex);
}
// concatenation of the lower and upper hulls gives the convex hull
// omit last points because they are repeated at the beginning of the other list
upper.pop();
lower.pop();
return upper.concat(lower);
};
})();
},{"../core/Common":14,"../geometry/Vector":28}],30:[function(_dereq_,module,exports){
var Matter = module.exports = _dereq_('../core/Matter');
Matter.Body = _dereq_('../body/Body');
Matter.Composite = _dereq_('../body/Composite');
Matter.World = _dereq_('../body/World');
Matter.Contact = _dereq_('../collision/Contact');
Matter.Detector = _dereq_('../collision/Detector');
Matter.Grid = _dereq_('../collision/Grid');
Matter.Pairs = _dereq_('../collision/Pairs');
Matter.Pair = _dereq_('../collision/Pair');
Matter.Query = _dereq_('../collision/Query');
Matter.Resolver = _dereq_('../collision/Resolver');
Matter.SAT = _dereq_('../collision/SAT');
Matter.Constraint = _dereq_('../constraint/Constraint');
Matter.MouseConstraint = _dereq_('../constraint/MouseConstraint');
Matter.Common = _dereq_('../core/Common');
Matter.Engine = _dereq_('../core/Engine');
Matter.Events = _dereq_('../core/Events');
Matter.Mouse = _dereq_('../core/Mouse');
Matter.Runner = _dereq_('../core/Runner');
Matter.Sleeping = _dereq_('../core/Sleeping');
Matter.Plugin = _dereq_('../core/Plugin');
Matter.Bodies = _dereq_('../factory/Bodies');
Matter.Composites = _dereq_('../factory/Composites');
Matter.Axes = _dereq_('../geometry/Axes');
Matter.Bounds = _dereq_('../geometry/Bounds');
Matter.Svg = _dereq_('../geometry/Svg');
Matter.Vector = _dereq_('../geometry/Vector');
Matter.Vertices = _dereq_('../geometry/Vertices');
Matter.Render = _dereq_('../render/Render');
Matter.RenderPixi = _dereq_('../render/RenderPixi');
// aliases
Matter.World.add = Matter.Composite.add;
Matter.World.remove = Matter.Composite.remove;
Matter.World.addComposite = Matter.Composite.addComposite;
Matter.World.addBody = Matter.Composite.addBody;
Matter.World.addConstraint = Matter.Composite.addConstraint;
Matter.World.clear = Matter.Composite.clear;
Matter.Engine.run = Matter.Runner.run;
},{"../body/Body":1,"../body/Composite":2,"../body/World":3,"../collision/Contact":4,"../collision/Detector":5,"../collision/Grid":6,"../collision/Pair":7,"../collision/Pairs":8,"../collision/Query":9,"../collision/Resolver":10,"../collision/SAT":11,"../constraint/Constraint":12,"../constraint/MouseConstraint":13,"../core/Common":14,"../core/Engine":15,"../core/Events":16,"../core/Matter":17,"../core/Metrics":18,"../core/Mouse":19,"../core/Plugin":20,"../core/Runner":21,"../core/Sleeping":22,"../factory/Bodies":23,"../factory/Composites":24,"../geometry/Axes":25,"../geometry/Bounds":26,"../geometry/Svg":27,"../geometry/Vector":28,"../geometry/Vertices":29,"../render/Render":31,"../render/RenderPixi":32}],31:[function(_dereq_,module,exports){
/**
* The `Matter.Render` module is a simple HTML5 canvas based renderer for visualising instances of `Matter.Engine`.
* It is intended for development and debugging purposes, but may also be suitable for simple games.
* It includes a number of drawing options including wireframe, vector with support for sprites and viewports.
*
* @class Render
*/
var Render = {};
module.exports = Render;
var Common = _dereq_('../core/Common');
var Composite = _dereq_('../body/Composite');
var Bounds = _dereq_('../geometry/Bounds');
var Events = _dereq_('../core/Events');
var Grid = _dereq_('../collision/Grid');
var Vector = _dereq_('../geometry/Vector');
var Mouse = _dereq_('../core/Mouse');
(function() {
var _requestAnimationFrame,
_cancelAnimationFrame;
if (typeof window !== 'undefined') {
_requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame || window.msRequestAnimationFrame
|| function(callback){ window.setTimeout(function() { callback(Common.now()); }, 1000 / 60); };
_cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame
|| window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;
}
/**
* Creates a new renderer. The options parameter is an object that specifies any properties you wish to override the defaults.
* All properties have default values, and many are pre-calculated automatically based on other properties.
* See the properties section below for detailed information on what you can pass via the `options` object.
* @method create
* @param {object} [options]
* @return {render} A new renderer
*/
Render.create = function(options) {
var defaults = {
controller: Render,
engine: null,
element: null,
canvas: null,
mouse: null,
frameRequestId: null,
options: {
width: 800,
height: 600,
pixelRatio: 1,
background: '#18181d',
wireframeBackground: '#0f0f13',
hasBounds: !!options.bounds,
enabled: true,
wireframes: true,
showSleeping: true,
showDebug: false,
showBroadphase: false,
showBounds: false,
showVelocity: false,
showCollisions: false,
showSeparations: false,
showAxes: false,
showPositions: false,
showAngleIndicator: false,
showIds: false,
showShadows: false,
showVertexNumbers: false,
showConvexHulls: false,
showInternalEdges: false,
showMousePosition: false
}
};
var render = Common.extend(defaults, options);
if (render.canvas) {
render.canvas.width = render.options.width || render.canvas.width;
render.canvas.height = render.options.height || render.canvas.height;
}
render.mouse = options.mouse;
render.engine = options.engine;
render.canvas = render.canvas || _createCanvas(render.options.width, render.options.height);
render.context = render.canvas.getContext('2d');
render.textures = {};
render.bounds = render.bounds || {
min: {
x: 0,
y: 0
},
max: {
x: render.canvas.width,
y: render.canvas.height
}
};
if (render.options.pixelRatio !== 1) {
Render.setPixelRatio(render, render.options.pixelRatio);
}
if (Common.isElement(render.element)) {
render.element.appendChild(render.canvas);
} else {
Common.log('Render.create: options.element was undefined, render.canvas was created but not appended', 'warn');
}
return render;
};
/**
* Continuously updates the render canvas on the `requestAnimationFrame` event.
* @method run
* @param {render} render
*/
Render.run = function(render) {
(function loop(time){
render.frameRequestId = _requestAnimationFrame(loop);
Render.world(render);
})();
};
/**
* Ends execution of `Render.run` on the given `render`, by canceling the animation frame request event loop.
* @method stop
* @param {render} render
*/
Render.stop = function(render) {
_cancelAnimationFrame(render.frameRequestId);
};
/**
* Sets the pixel ratio of the renderer and updates the canvas.
* To automatically detect the correct ratio, pass the string `'auto'` for `pixelRatio`.
* @method setPixelRatio
* @param {render} render
* @param {number} pixelRatio
*/
Render.setPixelRatio = function(render, pixelRatio) {
var options = render.options,
canvas = render.canvas;
if (pixelRatio === 'auto') {
pixelRatio = _getPixelRatio(canvas);
}
options.pixelRatio = pixelRatio;
canvas.setAttribute('data-pixel-ratio', pixelRatio);
canvas.width = options.width * pixelRatio;
canvas.height = options.height * pixelRatio;
canvas.style.width = options.width + 'px';
canvas.style.height = options.height + 'px';
render.context.scale(pixelRatio, pixelRatio);
};
/**
* Positions and sizes the viewport around the given object bounds.
* Objects must have at least one of the following properties:
* - `object.bounds`
* - `object.position`
* - `object.min` and `object.max`
* - `object.x` and `object.y`
* @method lookAt
* @param {render} render
* @param {object[]} objects
* @param {vector} [padding]
* @param {bool} [center=true]
*/
Render.lookAt = function(render, objects, padding, center) {
center = typeof center !== 'undefined' ? center : true;
objects = Common.isArray(objects) ? objects : [objects];
padding = padding || {
x: 0,
y: 0
};
// find bounds of all objects
var bounds = {
min: { x: Infinity, y: Infinity },
max: { x: -Infinity, y: -Infinity }
};
for (var i = 0; i < objects.length; i += 1) {
var object = objects[i],
min = object.bounds ? object.bounds.min : (object.min || object.position || object),
max = object.bounds ? object.bounds.max : (object.max || object.position || object);
if (min && max) {
if (min.x < bounds.min.x)
bounds.min.x = min.x;
if (max.x > bounds.max.x)
bounds.max.x = max.x;
if (min.y < bounds.min.y)
bounds.min.y = min.y;
if (max.y > bounds.max.y)
bounds.max.y = max.y;
}
}
// find ratios
var width = (bounds.max.x - bounds.min.x) + 2 * padding.x,
height = (bounds.max.y - bounds.min.y) + 2 * padding.y,
viewHeight = render.canvas.height,
viewWidth = render.canvas.width,
outerRatio = viewWidth / viewHeight,
innerRatio = width / height,
scaleX = 1,
scaleY = 1;
// find scale factor
if (innerRatio > outerRatio) {
scaleY = innerRatio / outerRatio;
} else {
scaleX = outerRatio / innerRatio;
}
// enable bounds
render.options.hasBounds = true;
// position and size
render.bounds.min.x = bounds.min.x;
render.bounds.max.x = bounds.min.x + width * scaleX;
render.bounds.min.y = bounds.min.y;
render.bounds.max.y = bounds.min.y + height * scaleY;
// center
if (center) {
render.bounds.min.x += width * 0.5 - (width * scaleX) * 0.5;
render.bounds.max.x += width * 0.5 - (width * scaleX) * 0.5;
render.bounds.min.y += height * 0.5 - (height * scaleY) * 0.5;
render.bounds.max.y += height * 0.5 - (height * scaleY) * 0.5;
}
// padding
render.bounds.min.x -= padding.x;
render.bounds.max.x -= padding.x;
render.bounds.min.y -= padding.y;
render.bounds.max.y -= padding.y;
// update mouse
if (render.mouse) {
Mouse.setScale(render.mouse, {
x: (render.bounds.max.x - render.bounds.min.x) / render.canvas.width,
y: (render.bounds.max.y - render.bounds.min.y) / render.canvas.height
});
Mouse.setOffset(render.mouse, render.bounds.min);
}
};
/**
* Applies viewport transforms based on `render.bounds` to a render context.
* @method startViewTransform
* @param {render} render
*/
Render.startViewTransform = function(render) {
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / render.options.width,
boundsScaleY = boundsHeight / render.options.height;
render.context.scale(1 / boundsScaleX, 1 / boundsScaleY);
render.context.translate(-render.bounds.min.x, -render.bounds.min.y);
};
/**
* Resets all transforms on the render context.
* @method endViewTransform
* @param {render} render
*/
Render.endViewTransform = function(render) {
render.context.setTransform(render.options.pixelRatio, 0, 0, render.options.pixelRatio, 0, 0);
};
/**
* Renders the given `engine`'s `Matter.World` object.
* This is the entry point for all rendering and should be called every time the scene changes.
* @method world
* @param {render} render
*/
Render.world = function(render) {
var engine = render.engine,
world = engine.world,
canvas = render.canvas,
context = render.context,
options = render.options,
allBodies = Composite.allBodies(world),
allConstraints = Composite.allConstraints(world),
background = options.wireframes ? options.wireframeBackground : options.background,
bodies = [],
constraints = [],
i;
var event = {
timestamp: engine.timing.timestamp
};
Events.trigger(render, 'beforeRender', event);
// apply background if it has changed
if (render.currentBackground !== background)
_applyBackground(render, background);
// clear the canvas with a transparent fill, to allow the canvas background to show
context.globalCompositeOperation = 'source-in';
context.fillStyle = "transparent";
context.fillRect(0, 0, canvas.width, canvas.height);
context.globalCompositeOperation = 'source-over';
// handle bounds
if (options.hasBounds) {
// filter out bodies that are not in view
for (i = 0; i < allBodies.length; i++) {
var body = allBodies[i];
if (Bounds.overlaps(body.bounds, render.bounds))
bodies.push(body);
}
// filter out constraints that are not in view
for (i = 0; i < allConstraints.length; i++) {
var constraint = allConstraints[i],
bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
pointAWorld = constraint.pointA,
pointBWorld = constraint.pointB;
if (bodyA) pointAWorld = Vector.add(bodyA.position, constraint.pointA);
if (bodyB) pointBWorld = Vector.add(bodyB.position, constraint.pointB);
if (!pointAWorld || !pointBWorld)
continue;
if (Bounds.contains(render.bounds, pointAWorld) || Bounds.contains(render.bounds, pointBWorld))
constraints.push(constraint);
}
// transform the view
Render.startViewTransform(render);
// update mouse
if (render.mouse) {
Mouse.setScale(render.mouse, {
x: (render.bounds.max.x - render.bounds.min.x) / render.canvas.width,
y: (render.bounds.max.y - render.bounds.min.y) / render.canvas.height
});
Mouse.setOffset(render.mouse, render.bounds.min);
}
} else {
constraints = allConstraints;
bodies = allBodies;
}
if (!options.wireframes || (engine.enableSleeping && options.showSleeping)) {
// fully featured rendering of bodies
Render.bodies(render, bodies, context);
} else {
if (options.showConvexHulls)
Render.bodyConvexHulls(render, bodies, context);
// optimised method for wireframes only
Render.bodyWireframes(render, bodies, context);
}
if (options.showBounds)
Render.bodyBounds(render, bodies, context);
if (options.showAxes || options.showAngleIndicator)
Render.bodyAxes(render, bodies, context);
if (options.showPositions)
Render.bodyPositions(render, bodies, context);
if (options.showVelocity)
Render.bodyVelocity(render, bodies, context);
if (options.showIds)
Render.bodyIds(render, bodies, context);
if (options.showSeparations)
Render.separations(render, engine.pairs.list, context);
if (options.showCollisions)
Render.collisions(render, engine.pairs.list, context);
if (options.showVertexNumbers)
Render.vertexNumbers(render, bodies, context);
if (options.showMousePosition)
Render.mousePosition(render, render.mouse, context);
Render.constraints(constraints, context);
if (options.showBroadphase && engine.broadphase.controller === Grid)
Render.grid(render, engine.broadphase, context);
if (options.showDebug)
Render.debug(render, context);
if (options.hasBounds) {
// revert view transforms
Render.endViewTransform(render);
}
Events.trigger(render, 'afterRender', event);
};
/**
* Description
* @private
* @method debug
* @param {render} render
* @param {RenderingContext} context
*/
Render.debug = function(render, context) {
var c = context,
engine = render.engine,
world = engine.world,
metrics = engine.metrics,
options = render.options,
bodies = Composite.allBodies(world),
space = " ";
if (engine.timing.timestamp - (render.debugTimestamp || 0) >= 500) {
var text = "";
if (metrics.timing) {
text += "fps: " + Math.round(metrics.timing.fps) + space;
}
render.debugString = text;
render.debugTimestamp = engine.timing.timestamp;
}
if (render.debugString) {
c.font = "12px Arial";
if (options.wireframes) {
c.fillStyle = 'rgba(255,255,255,0.5)';
} else {
c.fillStyle = 'rgba(0,0,0,0.5)';
}
var split = render.debugString.split('\n');
for (var i = 0; i < split.length; i++) {
c.fillText(split[i], 50, 50 + i * 18);
}
}
};
/**
* Description
* @private
* @method constraints
* @param {constraint[]} constraints
* @param {RenderingContext} context
*/
Render.constraints = function(constraints, context) {
var c = context;
for (var i = 0; i < constraints.length; i++) {
var constraint = constraints[i];
if (!constraint.render.visible || !constraint.pointA || !constraint.pointB)
continue;
var bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
start,
end;
if (bodyA) {
start = Vector.add(bodyA.position, constraint.pointA);
} else {
start = constraint.pointA;
}
if (constraint.render.type === 'pin') {
c.beginPath();
c.arc(start.x, start.y, 3, 0, 2 * Math.PI);
c.closePath();
} else {
if (bodyB) {
end = Vector.add(bodyB.position, constraint.pointB);
} else {
end = constraint.pointB;
}
c.beginPath();
c.moveTo(start.x, start.y);
if (constraint.render.type === 'spring') {
var delta = Vector.sub(end, start),
normal = Vector.perp(Vector.normalise(delta)),
coils = Math.ceil(Common.clamp(constraint.length / 5, 12, 20)),
offset;
for (var j = 1; j < coils; j += 1) {
offset = j % 2 === 0 ? 1 : -1;
c.lineTo(
start.x + delta.x * (j / coils) + normal.x * offset * 4,
start.y + delta.y * (j / coils) + normal.y * offset * 4
);
}
}
c.lineTo(end.x, end.y);
}
if (constraint.render.lineWidth) {
c.lineWidth = constraint.render.lineWidth;
c.strokeStyle = constraint.render.strokeStyle;
c.stroke();
}
if (constraint.render.anchors) {
c.fillStyle = constraint.render.strokeStyle;
c.beginPath();
c.arc(start.x, start.y, 3, 0, 2 * Math.PI);
c.arc(end.x, end.y, 3, 0, 2 * Math.PI);
c.closePath();
c.fill();
}
}
};
/**
* Description
* @private
* @method bodyShadows
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyShadows = function(render, bodies, context) {
var c = context,
engine = render.engine;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (!body.render.visible)
continue;
if (body.circleRadius) {
c.beginPath();
c.arc(body.position.x, body.position.y, body.circleRadius, 0, 2 * Math.PI);
c.closePath();
} else {
c.beginPath();
c.moveTo(body.vertices[0].x, body.vertices[0].y);
for (var j = 1; j < body.vertices.length; j++) {
c.lineTo(body.vertices[j].x, body.vertices[j].y);
}
c.closePath();
}
var distanceX = body.position.x - render.options.width * 0.5,
distanceY = body.position.y - render.options.height * 0.2,
distance = Math.abs(distanceX) + Math.abs(distanceY);
c.shadowColor = 'rgba(0,0,0,0.15)';
c.shadowOffsetX = 0.05 * distanceX;
c.shadowOffsetY = 0.05 * distanceY;
c.shadowBlur = 1 + 12 * Math.min(1, distance / 1000);
c.fill();
c.shadowColor = null;
c.shadowOffsetX = null;
c.shadowOffsetY = null;
c.shadowBlur = null;
}
};
/**
* Description
* @private
* @method bodies
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodies = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
showInternalEdges = options.showInternalEdges || !options.wireframes,
body,
part,
i,
k;
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {
part = body.parts[k];
if (!part.render.visible)
continue;
if (options.showSleeping && body.isSleeping) {
c.globalAlpha = 0.5 * part.render.opacity;
} else if (part.render.opacity !== 1) {
c.globalAlpha = part.render.opacity;
}
if (part.render.sprite && part.render.sprite.texture && !options.wireframes) {
// part sprite
var sprite = part.render.sprite,
texture = _getTexture(render, sprite.texture);
c.translate(part.position.x, part.position.y);
c.rotate(part.angle);
c.drawImage(
texture,
texture.width * -sprite.xOffset * sprite.xScale,
texture.height * -sprite.yOffset * sprite.yScale,
texture.width * sprite.xScale,
texture.height * sprite.yScale
);
// revert translation, hopefully faster than save / restore
c.rotate(-part.angle);
c.translate(-part.position.x, -part.position.y);
} else {
// part polygon
if (part.circleRadius) {
c.beginPath();
c.arc(part.position.x, part.position.y, part.circleRadius, 0, 2 * Math.PI);
} else {
c.beginPath();
c.moveTo(part.vertices[0].x, part.vertices[0].y);
for (var j = 1; j < part.vertices.length; j++) {
if (!part.vertices[j - 1].isInternal || showInternalEdges) {
c.lineTo(part.vertices[j].x, part.vertices[j].y);
} else {
c.moveTo(part.vertices[j].x, part.vertices[j].y);
}
if (part.vertices[j].isInternal && !showInternalEdges) {
c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);
}
}
c.lineTo(part.vertices[0].x, part.vertices[0].y);
c.closePath();
}
if (!options.wireframes) {
c.fillStyle = part.render.fillStyle;
if (part.render.lineWidth) {
c.lineWidth = part.render.lineWidth;
c.strokeStyle = part.render.strokeStyle;
c.stroke();
}
c.fill();
} else {
c.lineWidth = 1;
c.strokeStyle = '#bbb';
c.stroke();
}
}
c.globalAlpha = 1;
}
}
};
/**
* Optimised method for drawing body wireframes in one pass
* @private
* @method bodyWireframes
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyWireframes = function(render, bodies, context) {
var c = context,
showInternalEdges = render.options.showInternalEdges,
body,
part,
i,
j,
k;
c.beginPath();
// render all bodies
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {
part = body.parts[k];
c.moveTo(part.vertices[0].x, part.vertices[0].y);
for (j = 1; j < part.vertices.length; j++) {
if (!part.vertices[j - 1].isInternal || showInternalEdges) {
c.lineTo(part.vertices[j].x, part.vertices[j].y);
} else {
c.moveTo(part.vertices[j].x, part.vertices[j].y);
}
if (part.vertices[j].isInternal && !showInternalEdges) {
c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);
}
}
c.lineTo(part.vertices[0].x, part.vertices[0].y);
}
}
c.lineWidth = 1;
c.strokeStyle = '#bbb';
c.stroke();
};
/**
* Optimised method for drawing body convex hull wireframes in one pass
* @private
* @method bodyConvexHulls
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyConvexHulls = function(render, bodies, context) {
var c = context,
body,
part,
i,
j,
k;
c.beginPath();
// render convex hulls
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible || body.parts.length === 1)
continue;
c.moveTo(body.vertices[0].x, body.vertices[0].y);
for (j = 1; j < body.vertices.length; j++) {
c.lineTo(body.vertices[j].x, body.vertices[j].y);
}
c.lineTo(body.vertices[0].x, body.vertices[0].y);
}
c.lineWidth = 1;
c.strokeStyle = 'rgba(255,255,255,0.2)';
c.stroke();
};
/**
* Renders body vertex numbers.
* @private
* @method vertexNumbers
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.vertexNumbers = function(render, bodies, context) {
var c = context,
i,
j,
k;
for (i = 0; i < bodies.length; i++) {
var parts = bodies[i].parts;
for (k = parts.length > 1 ? 1 : 0; k < parts.length; k++) {
var part = parts[k];
for (j = 0; j < part.vertices.length; j++) {
c.fillStyle = 'rgba(255,255,255,0.2)';
c.fillText(i + '_' + j, part.position.x + (part.vertices[j].x - part.position.x) * 0.8, part.position.y + (part.vertices[j].y - part.position.y) * 0.8);
}
}
}
};
/**
* Renders mouse position.
* @private
* @method mousePosition
* @param {render} render
* @param {mouse} mouse
* @param {RenderingContext} context
*/
Render.mousePosition = function(render, mouse, context) {
var c = context;
c.fillStyle = 'rgba(255,255,255,0.8)';
c.fillText(mouse.position.x + ' ' + mouse.position.y, mouse.position.x + 5, mouse.position.y - 5);
};
/**
* Draws body bounds
* @private
* @method bodyBounds
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyBounds = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options;
c.beginPath();
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (body.render.visible) {
var parts = bodies[i].parts;
for (var j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
var part = parts[j];
c.rect(part.bounds.min.x, part.bounds.min.y, part.bounds.max.x - part.bounds.min.x, part.bounds.max.y - part.bounds.min.y);
}
}
}
if (options.wireframes) {
c.strokeStyle = 'rgba(255,255,255,0.08)';
} else {
c.strokeStyle = 'rgba(0,0,0,0.1)';
}
c.lineWidth = 1;
c.stroke();
};
/**
* Draws body angle indicators and axes
* @private
* @method bodyAxes
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyAxes = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
part,
i,
j,
k;
c.beginPath();
for (i = 0; i < bodies.length; i++) {
var body = bodies[i],
parts = body.parts;
if (!body.render.visible)
continue;
if (options.showAxes) {
// render all axes
for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
part = parts[j];
for (k = 0; k < part.axes.length; k++) {
var axis = part.axes[k];
c.moveTo(part.position.x, part.position.y);
c.lineTo(part.position.x + axis.x * 20, part.position.y + axis.y * 20);
}
}
} else {
for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
part = parts[j];
for (k = 0; k < part.axes.length; k++) {
// render a single axis indicator
c.moveTo(part.position.x, part.position.y);
c.lineTo((part.vertices[0].x + part.vertices[part.vertices.length-1].x) / 2,
(part.vertices[0].y + part.vertices[part.vertices.length-1].y) / 2);
}
}
}
}
if (options.wireframes) {
c.strokeStyle = 'indianred';
c.lineWidth = 1;
} else {
c.strokeStyle = 'rgba(255, 255, 255, 0.4)';
c.globalCompositeOperation = 'overlay';
c.lineWidth = 2;
}
c.stroke();
c.globalCompositeOperation = 'source-over';
};
/**
* Draws body positions
* @private
* @method bodyPositions
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyPositions = function(render, bodies, context) {
var c = context,
engine = render.engine,
options = render.options,
body,
part,
i,
k;
c.beginPath();
// render current positions
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (!body.render.visible)
continue;
// handle compound parts
for (k = 0; k < body.parts.length; k++) {
part = body.parts[k];
c.arc(part.position.x, part.position.y, 3, 0, 2 * Math.PI, false);
c.closePath();
}
}
if (options.wireframes) {
c.fillStyle = 'indianred';
} else {
c.fillStyle = 'rgba(0,0,0,0.5)';
}
c.fill();
c.beginPath();
// render previous positions
for (i = 0; i < bodies.length; i++) {
body = bodies[i];
if (body.render.visible) {
c.arc(body.positionPrev.x, body.positionPrev.y, 2, 0, 2 * Math.PI, false);
c.closePath();
}
}
c.fillStyle = 'rgba(255,165,0,0.8)';
c.fill();
};
/**
* Draws body velocity
* @private
* @method bodyVelocity
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyVelocity = function(render, bodies, context) {
var c = context;
c.beginPath();
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (!body.render.visible)
continue;
c.moveTo(body.position.x, body.position.y);
c.lineTo(body.position.x + (body.position.x - body.positionPrev.x) * 2, body.position.y + (body.position.y - body.positionPrev.y) * 2);
}
c.lineWidth = 3;
c.strokeStyle = 'cornflowerblue';
c.stroke();
};
/**
* Draws body ids
* @private
* @method bodyIds
* @param {render} render
* @param {body[]} bodies
* @param {RenderingContext} context
*/
Render.bodyIds = function(render, bodies, context) {
var c = context,
i,
j;
for (i = 0; i < bodies.length; i++) {
if (!bodies[i].render.visible)
continue;
var parts = bodies[i].parts;
for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {
var part = parts[j];
c.font = "12px Arial";
c.fillStyle = 'rgba(255,255,255,0.5)';
c.fillText(part.id, part.position.x + 10, part.position.y - 10);
}
}
};
/**
* Description
* @private
* @method collisions
* @param {render} render
* @param {pair[]} pairs
* @param {RenderingContext} context
*/
Render.collisions = function(render, pairs, context) {
var c = context,
options = render.options,
pair,
collision,
corrected,
bodyA,
bodyB,
i,
j;
c.beginPath();
// render collision positions
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive)
continue;
collision = pair.collision;
for (j = 0; j < pair.activeContacts.length; j++) {
var contact = pair.activeContacts[j],
vertex = contact.vertex;
c.rect(vertex.x - 1.5, vertex.y - 1.5, 3.5, 3.5);
}
}
if (options.wireframes) {
c.fillStyle = 'rgba(255,255,255,0.7)';
} else {
c.fillStyle = 'orange';
}
c.fill();
c.beginPath();
// render collision normals
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive)
continue;
collision = pair.collision;
if (pair.activeContacts.length > 0) {
var normalPosX = pair.activeContacts[0].vertex.x,
normalPosY = pair.activeContacts[0].vertex.y;
if (pair.activeContacts.length === 2) {
normalPosX = (pair.activeContacts[0].vertex.x + pair.activeContacts[1].vertex.x) / 2;
normalPosY = (pair.activeContacts[0].vertex.y + pair.activeContacts[1].vertex.y) / 2;
}
if (collision.bodyB === collision.supports[0].body || collision.bodyA.isStatic === true) {
c.moveTo(normalPosX - collision.normal.x * 8, normalPosY - collision.normal.y * 8);
} else {
c.moveTo(normalPosX + collision.normal.x * 8, normalPosY + collision.normal.y * 8);
}
c.lineTo(normalPosX, normalPosY);
}
}
if (options.wireframes) {
c.strokeStyle = 'rgba(255,165,0,0.7)';
} else {
c.strokeStyle = 'orange';
}
c.lineWidth = 1;
c.stroke();
};
/**
* Description
* @private
* @method separations
* @param {render} render
* @param {pair[]} pairs
* @param {RenderingContext} context
*/
Render.separations = function(render, pairs, context) {
var c = context,
options = render.options,
pair,
collision,
corrected,
bodyA,
bodyB,
i,
j;
c.beginPath();
// render separations
for (i = 0; i < pairs.length; i++) {
pair = pairs[i];
if (!pair.isActive)
continue;
collision = pair.collision;
bodyA = collision.bodyA;
bodyB = collision.bodyB;
var k = 1;
if (!bodyB.isStatic && !bodyA.isStatic) k = 0.5;
if (bodyB.isStatic) k = 0;
c.moveTo(bodyB.position.x, bodyB.position.y);
c.lineTo(bodyB.position.x - collision.penetration.x * k, bodyB.position.y - collision.penetration.y * k);
k = 1;
if (!bodyB.isStatic && !bodyA.isStatic) k = 0.5;
if (bodyA.isStatic) k = 0;
c.moveTo(bodyA.position.x, bodyA.position.y);
c.lineTo(bodyA.position.x + collision.penetration.x * k, bodyA.position.y + collision.penetration.y * k);
}
if (options.wireframes) {
c.strokeStyle = 'rgba(255,165,0,0.5)';
} else {
c.strokeStyle = 'orange';
}
c.stroke();
};
/**
* Description
* @private
* @method grid
* @param {render} render
* @param {grid} grid
* @param {RenderingContext} context
*/
Render.grid = function(render, grid, context) {
var c = context,
options = render.options;
if (options.wireframes) {
c.strokeStyle = 'rgba(255,180,0,0.1)';
} else {
c.strokeStyle = 'rgba(255,180,0,0.5)';
}
c.beginPath();
var bucketKeys = Common.keys(grid.buckets);
for (var i = 0; i < bucketKeys.length; i++) {
var bucketId = bucketKeys[i];
if (grid.buckets[bucketId].length < 2)
continue;
var region = bucketId.split(/C|R/);
c.rect(0.5 + parseInt(region[1], 10) * grid.bucketWidth,
0.5 + parseInt(region[2], 10) * grid.bucketHeight,
grid.bucketWidth,
grid.bucketHeight);
}
c.lineWidth = 1;
c.stroke();
};
/**
* Description
* @private
* @method inspector
* @param {inspector} inspector
* @param {RenderingContext} context
*/
Render.inspector = function(inspector, context) {
var engine = inspector.engine,
selected = inspector.selected,
render = inspector.render,
options = render.options,
bounds;
if (options.hasBounds) {
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / render.options.width,
boundsScaleY = boundsHeight / render.options.height;
context.scale(1 / boundsScaleX, 1 / boundsScaleY);
context.translate(-render.bounds.min.x, -render.bounds.min.y);
}
for (var i = 0; i < selected.length; i++) {
var item = selected[i].data;
context.translate(0.5, 0.5);
context.lineWidth = 1;
context.strokeStyle = 'rgba(255,165,0,0.9)';
context.setLineDash([1,2]);
switch (item.type) {
case 'body':
// render body selections
bounds = item.bounds;
context.beginPath();
context.rect(Math.floor(bounds.min.x - 3), Math.floor(bounds.min.y - 3),
Math.floor(bounds.max.x - bounds.min.x + 6), Math.floor(bounds.max.y - bounds.min.y + 6));
context.closePath();
context.stroke();
break;
case 'constraint':
// render constraint selections
var point = item.pointA;
if (item.bodyA)
point = item.pointB;
context.beginPath();
context.arc(point.x, point.y, 10, 0, 2 * Math.PI);
context.closePath();
context.stroke();
break;
}
context.setLineDash([]);
context.translate(-0.5, -0.5);
}
// render selection region
if (inspector.selectStart !== null) {
context.translate(0.5, 0.5);
context.lineWidth = 1;
context.strokeStyle = 'rgba(255,165,0,0.6)';
context.fillStyle = 'rgba(255,165,0,0.1)';
bounds = inspector.selectBounds;
context.beginPath();
context.rect(Math.floor(bounds.min.x), Math.floor(bounds.min.y),
Math.floor(bounds.max.x - bounds.min.x), Math.floor(bounds.max.y - bounds.min.y));
context.closePath();
context.stroke();
context.fill();
context.translate(-0.5, -0.5);
}
if (options.hasBounds)
context.setTransform(1, 0, 0, 1, 0, 0);
};
/**
* Description
* @method _createCanvas
* @private
* @param {} width
* @param {} height
* @return canvas
*/
var _createCanvas = function(width, height) {
var canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
canvas.oncontextmenu = function() { return false; };
canvas.onselectstart = function() { return false; };
return canvas;
};
/**
* Gets the pixel ratio of the canvas.
* @method _getPixelRatio
* @private
* @param {HTMLElement} canvas
* @return {Number} pixel ratio
*/
var _getPixelRatio = function(canvas) {
var context = canvas.getContext('2d'),
devicePixelRatio = window.devicePixelRatio || 1,
backingStorePixelRatio = context.webkitBackingStorePixelRatio || context.mozBackingStorePixelRatio
|| context.msBackingStorePixelRatio || context.oBackingStorePixelRatio
|| context.backingStorePixelRatio || 1;
return devicePixelRatio / backingStorePixelRatio;
};
/**
* Gets the requested texture (an Image) via its path
* @method _getTexture
* @private
* @param {render} render
* @param {string} imagePath
* @return {Image} texture
*/
var _getTexture = function(render, imagePath) {
var image = render.textures[imagePath];
if (image)
return image;
image = render.textures[imagePath] = new Image();
image.src = imagePath;
return image;
};
/**
* Applies the background to the canvas using CSS.
* @method applyBackground
* @private
* @param {render} render
* @param {string} background
*/
var _applyBackground = function(render, background) {
var cssBackground = background;
if (/(jpg|gif|png)$/.test(background))
cssBackground = 'url(' + background + ')';
render.canvas.style.background = cssBackground;
render.canvas.style.backgroundSize = "contain";
render.currentBackground = background;
};
/*
*
* Events Documentation
*
*/
/**
* Fired before rendering
*
* @event beforeRender
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/**
* Fired after rendering
*
* @event afterRender
* @param {} event An event object
* @param {number} event.timestamp The engine.timing.timestamp of the event
* @param {} event.source The source object of the event
* @param {} event.name The name of the event
*/
/*
*
* Properties Documentation
*
*/
/**
* A back-reference to the `Matter.Render` module.
*
* @property controller
* @type render
*/
/**
* A reference to the `Matter.Engine` instance to be used.
*
* @property engine
* @type engine
*/
/**
* A reference to the element where the canvas is to be inserted (if `render.canvas` has not been specified)
*
* @property element
* @type HTMLElement
* @default null
*/
/**
* The canvas element to render to. If not specified, one will be created if `render.element` has been specified.
*
* @property canvas
* @type HTMLCanvasElement
* @default null
*/
/**
* The configuration options of the renderer.
*
* @property options
* @type {}
*/
/**
* The target width in pixels of the `render.canvas` to be created.
*
* @property options.width
* @type number
* @default 800
*/
/**
* The target height in pixels of the `render.canvas` to be created.
*
* @property options.height
* @type number
* @default 600
*/
/**
* A flag that specifies if `render.bounds` should be used when rendering.
*
* @property options.hasBounds
* @type boolean
* @default false
*/
/**
* A `Bounds` object that specifies the drawing view region.
* Rendering will be automatically transformed and scaled to fit within the canvas size (`render.options.width` and `render.options.height`).
* This allows for creating views that can pan or zoom around the scene.
* You must also set `render.options.hasBounds` to `true` to enable bounded rendering.
*
* @property bounds
* @type bounds
*/
/**
* The 2d rendering context from the `render.canvas` element.
*
* @property context
* @type CanvasRenderingContext2D
*/
/**
* The sprite texture cache.
*
* @property textures
* @type {}
*/
})();
},{"../body/Composite":2,"../collision/Grid":6,"../core/Common":14,"../core/Events":16,"../core/Mouse":19,"../geometry/Bounds":26,"../geometry/Vector":28}],32:[function(_dereq_,module,exports){
/**
* The `Matter.RenderPixi` module is an example renderer using pixi.js.
* See also `Matter.Render` for a canvas based renderer.
*
* @class RenderPixi
* @deprecated the Matter.RenderPixi module will soon be removed from the Matter.js core.
* It will likely be moved to its own repository (but maintenance will be limited).
*/
var RenderPixi = {};
module.exports = RenderPixi;
var Bounds = _dereq_('../geometry/Bounds');
var Composite = _dereq_('../body/Composite');
var Common = _dereq_('../core/Common');
var Events = _dereq_('../core/Events');
var Vector = _dereq_('../geometry/Vector');
(function() {
var _requestAnimationFrame,
_cancelAnimationFrame;
if (typeof window !== 'undefined') {
_requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame || window.msRequestAnimationFrame
|| function(callback){ window.setTimeout(function() { callback(Common.now()); }, 1000 / 60); };
_cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame
|| window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;
}
/**
* Creates a new Pixi.js WebGL renderer
* @method create
* @param {object} options
* @return {RenderPixi} A new renderer
* @deprecated
*/
RenderPixi.create = function(options) {
Common.warn('RenderPixi.create: Matter.RenderPixi is deprecated (see docs)');
var defaults = {
controller: RenderPixi,
engine: null,
element: null,
frameRequestId: null,
canvas: null,
renderer: null,
container: null,
spriteContainer: null,
pixiOptions: null,
options: {
width: 800,
height: 600,
background: '#fafafa',
wireframeBackground: '#222',
hasBounds: false,
enabled: true,
wireframes: true,
showSleeping: true,
showDebug: false,
showBroadphase: false,
showBounds: false,
showVelocity: false,
showCollisions: false,
showAxes: false,
showPositions: false,
showAngleIndicator: false,
showIds: false,
showShadows: false
}
};
var render = Common.extend(defaults, options),
transparent = !render.options.wireframes && render.options.background === 'transparent';
// init pixi
render.pixiOptions = render.pixiOptions || {
view: render.canvas,
transparent: transparent,
antialias: true,
backgroundColor: options.background
};
render.mouse = options.mouse;
render.engine = options.engine;
render.renderer = render.renderer || new PIXI.WebGLRenderer(render.options.width, render.options.height, render.pixiOptions);
render.container = render.container || new PIXI.Container();
render.spriteContainer = render.spriteContainer || new PIXI.Container();
render.canvas = render.canvas || render.renderer.view;
render.bounds = render.bounds || {
min: {
x: 0,
y: 0
},
max: {
x: render.options.width,
y: render.options.height
}
};
// event listeners
Events.on(render.engine, 'beforeUpdate', function() {
RenderPixi.clear(render);
});
// caches
render.textures = {};
render.sprites = {};
render.primitives = {};
// use a sprite batch for performance
render.container.addChild(render.spriteContainer);
// insert canvas
if (Common.isElement(render.element)) {
render.element.appendChild(render.canvas);
} else {
Common.warn('No "render.element" passed, "render.canvas" was not inserted into document.');
}
// prevent menus on canvas
render.canvas.oncontextmenu = function() { return false; };
render.canvas.onselectstart = function() { return false; };
return render;
};
/**
* Continuously updates the render canvas on the `requestAnimationFrame` event.
* @method run
* @param {render} render
* @deprecated
*/
RenderPixi.run = function(render) {
(function loop(time){
render.frameRequestId = _requestAnimationFrame(loop);
RenderPixi.world(render);
})();
};
/**
* Ends execution of `Render.run` on the given `render`, by canceling the animation frame request event loop.
* @method stop
* @param {render} render
* @deprecated
*/
RenderPixi.stop = function(render) {
_cancelAnimationFrame(render.frameRequestId);
};
/**
* Clears the scene graph
* @method clear
* @param {RenderPixi} render
* @deprecated
*/
RenderPixi.clear = function(render) {
var container = render.container,
spriteContainer = render.spriteContainer;
// clear stage container
while (container.children[0]) {
container.removeChild(container.children[0]);
}
// clear sprite batch
while (spriteContainer.children[0]) {
spriteContainer.removeChild(spriteContainer.children[0]);
}
var bgSprite = render.sprites['bg-0'];
// clear caches
render.textures = {};
render.sprites = {};
render.primitives = {};
// set background sprite
render.sprites['bg-0'] = bgSprite;
if (bgSprite)
container.addChildAt(bgSprite, 0);
// add sprite batch back into container
render.container.addChild(render.spriteContainer);
// reset background state
render.currentBackground = null;
// reset bounds transforms
container.scale.set(1, 1);
container.position.set(0, 0);
};
/**
* Sets the background of the canvas
* @method setBackground
* @param {RenderPixi} render
* @param {string} background
* @deprecated
*/
RenderPixi.setBackground = function(render, background) {
if (render.currentBackground !== background) {
var isColor = background.indexOf && background.indexOf('#') !== -1,
bgSprite = render.sprites['bg-0'];
if (isColor) {
// if solid background color
var color = Common.colorToNumber(background);
render.renderer.backgroundColor = color;
// remove background sprite if existing
if (bgSprite)
render.container.removeChild(bgSprite);
} else {
// initialise background sprite if needed
if (!bgSprite) {
var texture = _getTexture(render, background);
bgSprite = render.sprites['bg-0'] = new PIXI.Sprite(texture);
bgSprite.position.x = 0;
bgSprite.position.y = 0;
render.container.addChildAt(bgSprite, 0);
}
}
render.currentBackground = background;
}
};
/**
* Description
* @method world
* @param {engine} engine
* @deprecated
*/
RenderPixi.world = function(render) {
var engine = render.engine,
world = engine.world,
renderer = render.renderer,
container = render.container,
options = render.options,
bodies = Composite.allBodies(world),
allConstraints = Composite.allConstraints(world),
constraints = [],
i;
if (options.wireframes) {
RenderPixi.setBackground(render, options.wireframeBackground);
} else {
RenderPixi.setBackground(render, options.background);
}
// handle bounds
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / render.options.width,
boundsScaleY = boundsHeight / render.options.height;
if (options.hasBounds) {
// Hide bodies that are not in view
for (i = 0; i < bodies.length; i++) {
var body = bodies[i];
body.render.sprite.visible = Bounds.overlaps(body.bounds, render.bounds);
}
// filter out constraints that are not in view
for (i = 0; i < allConstraints.length; i++) {
var constraint = allConstraints[i],
bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
pointAWorld = constraint.pointA,
pointBWorld = constraint.pointB;
if (bodyA) pointAWorld = Vector.add(bodyA.position, constraint.pointA);
if (bodyB) pointBWorld = Vector.add(bodyB.position, constraint.pointB);
if (!pointAWorld || !pointBWorld)
continue;
if (Bounds.contains(render.bounds, pointAWorld) || Bounds.contains(render.bounds, pointBWorld))
constraints.push(constraint);
}
// transform the view
container.scale.set(1 / boundsScaleX, 1 / boundsScaleY);
container.position.set(-render.bounds.min.x * (1 / boundsScaleX), -render.bounds.min.y * (1 / boundsScaleY));
} else {
constraints = allConstraints;
}
for (i = 0; i < bodies.length; i++)
RenderPixi.body(render, bodies[i]);
for (i = 0; i < constraints.length; i++)
RenderPixi.constraint(render, constraints[i]);
renderer.render(container);
};
/**
* Description
* @method constraint
* @param {engine} engine
* @param {constraint} constraint
* @deprecated
*/
RenderPixi.constraint = function(render, constraint) {
var engine = render.engine,
bodyA = constraint.bodyA,
bodyB = constraint.bodyB,
pointA = constraint.pointA,
pointB = constraint.pointB,
container = render.container,
constraintRender = constraint.render,
primitiveId = 'c-' + constraint.id,
primitive = render.primitives[primitiveId];
// initialise constraint primitive if not existing
if (!primitive)
primitive = render.primitives[primitiveId] = new PIXI.Graphics();
// don't render if constraint does not have two end points
if (!constraintRender.visible || !constraint.pointA || !constraint.pointB) {
primitive.clear();
return;
}
// add to scene graph if not already there
if (Common.indexOf(container.children, primitive) === -1)
container.addChild(primitive);
// render the constraint on every update, since they can change dynamically
primitive.clear();
primitive.beginFill(0, 0);
primitive.lineStyle(constraintRender.lineWidth, Common.colorToNumber(constraintRender.strokeStyle), 1);
if (bodyA) {
primitive.moveTo(bodyA.position.x + pointA.x, bodyA.position.y + pointA.y);
} else {
primitive.moveTo(pointA.x, pointA.y);
}
if (bodyB) {
primitive.lineTo(bodyB.position.x + pointB.x, bodyB.position.y + pointB.y);
} else {
primitive.lineTo(pointB.x, pointB.y);
}
primitive.endFill();
};
/**
* Description
* @method body
* @param {engine} engine
* @param {body} body
* @deprecated
*/
RenderPixi.body = function(render, body) {
var engine = render.engine,
bodyRender = body.render;
if (!bodyRender.visible)
return;
if (bodyRender.sprite && bodyRender.sprite.texture) {
var spriteId = 'b-' + body.id,
sprite = render.sprites[spriteId],
spriteContainer = render.spriteContainer;
// initialise body sprite if not existing
if (!sprite)
sprite = render.sprites[spriteId] = _createBodySprite(render, body);
// add to scene graph if not already there
if (Common.indexOf(spriteContainer.children, sprite) === -1)
spriteContainer.addChild(sprite);
// update body sprite
sprite.position.x = body.position.x;
sprite.position.y = body.position.y;
sprite.rotation = body.angle;
sprite.scale.x = bodyRender.sprite.xScale || 1;
sprite.scale.y = bodyRender.sprite.yScale || 1;
} else {
var primitiveId = 'b-' + body.id,
primitive = render.primitives[primitiveId],
container = render.container;
// initialise body primitive if not existing
if (!primitive) {
primitive = render.primitives[primitiveId] = _createBodyPrimitive(render, body);
primitive.initialAngle = body.angle;
}
// add to scene graph if not already there
if (Common.indexOf(container.children, primitive) === -1)
container.addChild(primitive);
// update body primitive
primitive.position.x = body.position.x;
primitive.position.y = body.position.y;
primitive.rotation = body.angle - primitive.initialAngle;
}
};
/**
* Creates a body sprite
* @method _createBodySprite
* @private
* @param {RenderPixi} render
* @param {body} body
* @return {PIXI.Sprite} sprite
* @deprecated
*/
var _createBodySprite = function(render, body) {
var bodyRender = body.render,
texturePath = bodyRender.sprite.texture,
texture = _getTexture(render, texturePath),
sprite = new PIXI.Sprite(texture);
sprite.anchor.x = body.render.sprite.xOffset;
sprite.anchor.y = body.render.sprite.yOffset;
return sprite;
};
/**
* Creates a body primitive
* @method _createBodyPrimitive
* @private
* @param {RenderPixi} render
* @param {body} body
* @return {PIXI.Graphics} graphics
* @deprecated
*/
var _createBodyPrimitive = function(render, body) {
var bodyRender = body.render,
options = render.options,
primitive = new PIXI.Graphics(),
fillStyle = Common.colorToNumber(bodyRender.fillStyle),
strokeStyle = Common.colorToNumber(bodyRender.strokeStyle),
strokeStyleIndicator = Common.colorToNumber(bodyRender.strokeStyle),
strokeStyleWireframe = Common.colorToNumber('#bbb'),
strokeStyleWireframeIndicator = Common.colorToNumber('#CD5C5C'),
part;
primitive.clear();
// handle compound parts
for (var k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {
part = body.parts[k];
if (!options.wireframes) {
primitive.beginFill(fillStyle, 1);
primitive.lineStyle(bodyRender.lineWidth, strokeStyle, 1);
} else {
primitive.beginFill(0, 0);
primitive.lineStyle(1, strokeStyleWireframe, 1);
}
primitive.moveTo(part.vertices[0].x - body.position.x, part.vertices[0].y - body.position.y);
for (var j = 1; j < part.vertices.length; j++) {
primitive.lineTo(part.vertices[j].x - body.position.x, part.vertices[j].y - body.position.y);
}
primitive.lineTo(part.vertices[0].x - body.position.x, part.vertices[0].y - body.position.y);
primitive.endFill();
// angle indicator
if (options.showAngleIndicator || options.showAxes) {
primitive.beginFill(0, 0);
if (options.wireframes) {
primitive.lineStyle(1, strokeStyleWireframeIndicator, 1);
} else {
primitive.lineStyle(1, strokeStyleIndicator);
}
primitive.moveTo(part.position.x - body.position.x, part.position.y - body.position.y);
primitive.lineTo(((part.vertices[0].x + part.vertices[part.vertices.length-1].x) / 2 - body.position.x),
((part.vertices[0].y + part.vertices[part.vertices.length-1].y) / 2 - body.position.y));
primitive.endFill();
}
}
return primitive;
};
/**
* Gets the requested texture (a PIXI.Texture) via its path
* @method _getTexture
* @private
* @param {RenderPixi} render
* @param {string} imagePath
* @return {PIXI.Texture} texture
* @deprecated
*/
var _getTexture = function(render, imagePath) {
var texture = render.textures[imagePath];
if (!texture)
texture = render.textures[imagePath] = PIXI.Texture.fromImage(imagePath);
return texture;
};
})();
},{"../body/Composite":2,"../core/Common":14,"../core/Events":16,"../geometry/Bounds":26,"../geometry/Vector":28}]},{},[30])(30)
});
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}]},{},[])
//# 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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","/**\n* matter-js 0.13.0 by @liabru 2017-07-06\n* http://brm.io/matter-js/\n* License MIT\n*/\n\n/**\n * The MIT License (MIT)\n * \n * Copyright (c) Liam Brummitt and contributors.\n * \n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n * \n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n * \n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\n(function(f){if(typeof exports===\"object\"&&typeof module!==\"undefined\"){module.exports=f()}else if(typeof define===\"function\"&&define.amd){define([],f)}else{var g;if(typeof window!==\"undefined\"){g=window}else if(typeof global!==\"undefined\"){g=global}else if(typeof self!==\"undefined\"){g=self}else{g=this}g.Matter = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){\n/**\n* The `Matter.Body` module contains methods for creating and manipulating body models.\n* A `Matter.Body` is a rigid body that can be simulated by a `Matter.Engine`.\n* Factories for commonly used body configurations (such as rectangles, circles and other polygons) can be found in the module `Matter.Bodies`.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n\n* @class Body\n*/\n\nvar Body = {};\n\nmodule.exports = Body;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Vector = _dereq_('../geometry/Vector');\nvar Sleeping = _dereq_('../core/Sleeping');\nvar Render = _dereq_('../render/Render');\nvar Common = _dereq_('../core/Common');\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Axes = _dereq_('../geometry/Axes');\n\n(function() {\n\n    Body._inertiaScale = 4;\n    Body._nextCollidingGroupId = 1;\n    Body._nextNonCollidingGroupId = -1;\n    Body._nextCategory = 0x0001;\n\n    /**\n     * Creates a new rigid body model. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * All properties have default values, and many are pre-calculated automatically based on other properties.\n     * Vertices must be specified in clockwise order.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {} options\n     * @return {body} body\n     */\n    Body.create = function(options) {\n        var defaults = {\n            id: Common.nextId(),\n            type: 'body',\n            label: 'Body',\n            parts: [],\n            plugin: {},\n            angle: 0,\n            vertices: Vertices.fromPath('L 0 0 L 40 0 L 40 40 L 0 40'),\n            position: { x: 0, y: 0 },\n            force: { x: 0, y: 0 },\n            torque: 0,\n            positionImpulse: { x: 0, y: 0 },\n            constraintImpulse: { x: 0, y: 0, angle: 0 },\n            totalContacts: 0,\n            speed: 0,\n            angularSpeed: 0,\n            velocity: { x: 0, y: 0 },\n            angularVelocity: 0,\n            isSensor: false,\n            isStatic: false,\n            isSleeping: false,\n            motion: 0,\n            sleepThreshold: 60,\n            density: 0.001,\n            restitution: 0,\n            friction: 0.1,\n            frictionStatic: 0.5,\n            frictionAir: 0.01,\n            collisionFilter: {\n                category: 0x0001,\n                mask: 0xFFFFFFFF,\n                group: 0\n            },\n            slop: 0.05,\n            timeScale: 1,\n            render: {\n                visible: true,\n                opacity: 1,\n                sprite: {\n                    xScale: 1,\n                    yScale: 1,\n                    xOffset: 0,\n                    yOffset: 0\n                },\n                lineWidth: 0\n            }\n        };\n\n        var body = Common.extend(defaults, options);\n\n        _initProperties(body, options);\n\n        return body;\n    };\n\n    /**\n     * Returns the next unique group index for which bodies will collide.\n     * If `isNonColliding` is `true`, returns the next unique group index for which bodies will _not_ collide.\n     * See `body.collisionFilter` for more information.\n     * @method nextGroup\n     * @param {bool} [isNonColliding=false]\n     * @return {Number} Unique group index\n     */\n    Body.nextGroup = function(isNonColliding) {\n        if (isNonColliding)\n            return Body._nextNonCollidingGroupId--;\n\n        return Body._nextCollidingGroupId++;\n    };\n\n    /**\n     * Returns the next unique category bitfield (starting after the initial default category `0x0001`).\n     * There are 32 available. See `body.collisionFilter` for more information.\n     * @method nextCategory\n     * @return {Number} Unique category bitfield\n     */\n    Body.nextCategory = function() {\n        Body._nextCategory = Body._nextCategory << 1;\n        return Body._nextCategory;\n    };\n\n    /**\n     * Initialises body properties.\n     * @method _initProperties\n     * @private\n     * @param {body} body\n     * @param {} [options]\n     */\n    var _initProperties = function(body, options) {\n        options = options || {};\n\n        // init required properties (order is important)\n        Body.set(body, {\n            bounds: body.bounds || Bounds.create(body.vertices),\n            positionPrev: body.positionPrev || Vector.clone(body.position),\n            anglePrev: body.anglePrev || body.angle,\n            vertices: body.vertices,\n            parts: body.parts || [body],\n            isStatic: body.isStatic,\n            isSleeping: body.isSleeping,\n            parent: body.parent || body\n        });\n\n        Vertices.rotate(body.vertices, body.angle, body.position);\n        Axes.rotate(body.axes, body.angle);\n        Bounds.update(body.bounds, body.vertices, body.velocity);\n\n        // allow options to override the automatically calculated properties\n        Body.set(body, {\n            axes: options.axes || body.axes,\n            area: options.area || body.area,\n            mass: options.mass || body.mass,\n            inertia: options.inertia || body.inertia\n        });\n\n        // render properties\n        var defaultFillStyle = (body.isStatic ? '#2e2b44' : Common.choose(['#006BA6', '#0496FF', '#FFBC42', '#D81159', '#8F2D56'])),\n            defaultStrokeStyle = '#000';\n        body.render.fillStyle = body.render.fillStyle || defaultFillStyle;\n        body.render.strokeStyle = body.render.strokeStyle || defaultStrokeStyle;\n        body.render.sprite.xOffset += -(body.bounds.min.x - body.position.x) / (body.bounds.max.x - body.bounds.min.x);\n        body.render.sprite.yOffset += -(body.bounds.min.y - body.position.y) / (body.bounds.max.y - body.bounds.min.y);\n    };\n\n    /**\n     * Given a property and a value (or map of), sets the property(s) on the body, using the appropriate setter functions if they exist.\n     * Prefer to use the actual setter functions in performance critical situations.\n     * @method set\n     * @param {body} body\n     * @param {} settings A property name (or map of properties and values) to set on the body.\n     * @param {} value The value to set if `settings` is a single property name.\n     */\n    Body.set = function(body, settings, value) {\n        var property;\n\n        if (typeof settings === 'string') {\n            property = settings;\n            settings = {};\n            settings[property] = value;\n        }\n\n        for (property in settings) {\n            value = settings[property];\n\n            if (!settings.hasOwnProperty(property))\n                continue;\n\n            switch (property) {\n\n            case 'isStatic':\n                Body.setStatic(body, value);\n                break;\n            case 'isSleeping':\n                Sleeping.set(body, value);\n                break;\n            case 'mass':\n                Body.setMass(body, value);\n                break;\n            case 'density':\n                Body.setDensity(body, value);\n                break;\n            case 'inertia':\n                Body.setInertia(body, value);\n                break;\n            case 'vertices':\n                Body.setVertices(body, value);\n                break;\n            case 'position':\n                Body.setPosition(body, value);\n                break;\n            case 'angle':\n                Body.setAngle(body, value);\n                break;\n            case 'velocity':\n                Body.setVelocity(body, value);\n                break;\n            case 'angularVelocity':\n                Body.setAngularVelocity(body, value);\n                break;\n            case 'parts':\n                Body.setParts(body, value);\n                break;\n            default:\n                body[property] = value;\n\n            }\n        }\n    };\n\n    /**\n     * Sets the body as static, including isStatic flag and setting mass and inertia to Infinity.\n     * @method setStatic\n     * @param {body} body\n     * @param {bool} isStatic\n     */\n    Body.setStatic = function(body, isStatic) {\n        for (var i = 0; i < body.parts.length; i++) {\n            var part = body.parts[i];\n            part.isStatic = isStatic;\n\n            if (isStatic) {\n                part._original = {\n                    restitution: part.restitution,\n                    friction: part.friction,\n                    mass: part.mass,\n                    inertia: part.inertia,\n                    density: part.density,\n                    inverseMass: part.inverseMass,\n                    inverseInertia: part.inverseInertia\n                };\n\n                part.restitution = 0;\n                part.friction = 1;\n                part.mass = part.inertia = part.density = Infinity;\n                part.inverseMass = part.inverseInertia = 0;\n\n                part.positionPrev.x = part.position.x;\n                part.positionPrev.y = part.position.y;\n                part.anglePrev = part.angle;\n                part.angularVelocity = 0;\n                part.speed = 0;\n                part.angularSpeed = 0;\n                part.motion = 0;\n            } else if (part._original) {\n                part.restitution = part._original.restitution;\n                part.friction = part._original.friction;\n                part.mass = part._original.mass;\n                part.inertia = part._original.inertia;\n                part.density = part._original.density;\n                part.inverseMass = part._original.inverseMass;\n                part.inverseInertia = part._original.inverseInertia;\n\n                delete part._original;\n            }\n        }\n    };\n\n    /**\n     * Sets the mass of the body. Inverse mass and density are automatically updated to reflect the change.\n     * @method setMass\n     * @param {body} body\n     * @param {number} mass\n     */\n    Body.setMass = function(body, mass) {\n        body.mass = mass;\n        body.inverseMass = 1 / body.mass;\n        body.density = body.mass / body.area;\n    };\n\n    /**\n     * Sets the density of the body. Mass is automatically updated to reflect the change.\n     * @method setDensity\n     * @param {body} body\n     * @param {number} density\n     */\n    Body.setDensity = function(body, density) {\n        Body.setMass(body, density * body.area);\n        body.density = density;\n    };\n\n    /**\n     * Sets the moment of inertia (i.e. second moment of area) of the body of the body. \n     * Inverse inertia is automatically updated to reflect the change. Mass is not changed.\n     * @method setInertia\n     * @param {body} body\n     * @param {number} inertia\n     */\n    Body.setInertia = function(body, inertia) {\n        body.inertia = inertia;\n        body.inverseInertia = 1 / body.inertia;\n    };\n\n    /**\n     * Sets the body's vertices and updates body properties accordingly, including inertia, area and mass (with respect to `body.density`).\n     * Vertices will be automatically transformed to be orientated around their centre of mass as the origin.\n     * They are then automatically translated to world space based on `body.position`.\n     *\n     * The `vertices` argument should be passed as an array of `Matter.Vector` points (or a `Matter.Vertices` array).\n     * Vertices must form a convex hull, concave hulls are not supported.\n     *\n     * @method setVertices\n     * @param {body} body\n     * @param {vector[]} vertices\n     */\n    Body.setVertices = function(body, vertices) {\n        // change vertices\n        if (vertices[0].body === body) {\n            body.vertices = vertices;\n        } else {\n            body.vertices = Vertices.create(vertices, body);\n        }\n\n        // update properties\n        body.axes = Axes.fromVertices(body.vertices);\n        body.area = Vertices.area(body.vertices);\n        Body.setMass(body, body.density * body.area);\n\n        // orient vertices around the centre of mass at origin (0, 0)\n        var centre = Vertices.centre(body.vertices);\n        Vertices.translate(body.vertices, centre, -1);\n\n        // update inertia while vertices are at origin (0, 0)\n        Body.setInertia(body, Body._inertiaScale * Vertices.inertia(body.vertices, body.mass));\n\n        // update geometry\n        Vertices.translate(body.vertices, body.position);\n        Bounds.update(body.bounds, body.vertices, body.velocity);\n    };\n\n    /**\n     * Sets the parts of the `body` and updates mass, inertia and centroid.\n     * Each part will have its parent set to `body`.\n     * By default the convex hull will be automatically computed and set on `body`, unless `autoHull` is set to `false.`\n     * Note that this method will ensure that the first part in `body.parts` will always be the `body`.\n     * @method setParts\n     * @param {body} body\n     * @param [body] parts\n     * @param {bool} [autoHull=true]\n     */\n    Body.setParts = function(body, parts, autoHull) {\n        var i;\n\n        // add all the parts, ensuring that the first part is always the parent body\n        parts = parts.slice(0);\n        body.parts.length = 0;\n        body.parts.push(body);\n        body.parent = body;\n\n        for (i = 0; i < parts.length; i++) {\n            var part = parts[i];\n            if (part !== body) {\n                part.parent = body;\n                body.parts.push(part);\n            }\n        }\n\n        if (body.parts.length === 1)\n            return;\n\n        autoHull = typeof autoHull !== 'undefined' ? autoHull : true;\n\n        // find the convex hull of all parts to set on the parent body\n        if (autoHull) {\n            var vertices = [];\n            for (i = 0; i < parts.length; i++) {\n                vertices = vertices.concat(parts[i].vertices);\n            }\n\n            Vertices.clockwiseSort(vertices);\n\n            var hull = Vertices.hull(vertices),\n                hullCentre = Vertices.centre(hull);\n\n            Body.setVertices(body, hull);\n            Vertices.translate(body.vertices, hullCentre);\n        }\n\n        // sum the properties of all compound parts of the parent body\n        var total = _totalProperties(body);\n\n        body.area = total.area;\n        body.parent = body;\n        body.position.x = total.centre.x;\n        body.position.y = total.centre.y;\n        body.positionPrev.x = total.centre.x;\n        body.positionPrev.y = total.centre.y;\n\n        Body.setMass(body, total.mass);\n        Body.setInertia(body, total.inertia);\n        Body.setPosition(body, total.centre);\n    };\n\n    /**\n     * Sets the position of the body instantly. Velocity, angle, force etc. are unchanged.\n     * @method setPosition\n     * @param {body} body\n     * @param {vector} position\n     */\n    Body.setPosition = function(body, position) {\n        var delta = Vector.sub(position, body.position);\n        body.positionPrev.x += delta.x;\n        body.positionPrev.y += delta.y;\n\n        for (var i = 0; i < body.parts.length; i++) {\n            var part = body.parts[i];\n            part.position.x += delta.x;\n            part.position.y += delta.y;\n            Vertices.translate(part.vertices, delta);\n            Bounds.update(part.bounds, part.vertices, body.velocity);\n        }\n    };\n\n    /**\n     * Sets the angle of the body instantly. Angular velocity, position, force etc. are unchanged.\n     * @method setAngle\n     * @param {body} body\n     * @param {number} angle\n     */\n    Body.setAngle = function(body, angle) {\n        var delta = angle - body.angle;\n        body.anglePrev += delta;\n\n        for (var i = 0; i < body.parts.length; i++) {\n            var part = body.parts[i];\n            part.angle += delta;\n            Vertices.rotate(part.vertices, delta, body.position);\n            Axes.rotate(part.axes, delta);\n            Bounds.update(part.bounds, part.vertices, body.velocity);\n            if (i > 0) {\n                Vector.rotateAbout(part.position, delta, body.position, part.position);\n            }\n        }\n    };\n\n    /**\n     * Sets the linear velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.\n     * @method setVelocity\n     * @param {body} body\n     * @param {vector} velocity\n     */\n    Body.setVelocity = function(body, velocity) {\n        body.positionPrev.x = body.position.x - velocity.x;\n        body.positionPrev.y = body.position.y - velocity.y;\n        body.velocity.x = velocity.x;\n        body.velocity.y = velocity.y;\n        body.speed = Vector.magnitude(body.velocity);\n    };\n\n    /**\n     * Sets the angular velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.\n     * @method setAngularVelocity\n     * @param {body} body\n     * @param {number} velocity\n     */\n    Body.setAngularVelocity = function(body, velocity) {\n        body.anglePrev = body.angle - velocity;\n        body.angularVelocity = velocity;\n        body.angularSpeed = Math.abs(body.angularVelocity);\n    };\n\n    /**\n     * Moves a body by a given vector relative to its current position, without imparting any velocity.\n     * @method translate\n     * @param {body} body\n     * @param {vector} translation\n     */\n    Body.translate = function(body, translation) {\n        Body.setPosition(body, Vector.add(body.position, translation));\n    };\n\n    /**\n     * Rotates a body by a given angle relative to its current angle, without imparting any angular velocity.\n     * @method rotate\n     * @param {body} body\n     * @param {number} rotation\n     * @param {vector} [point]\n     */\n    Body.rotate = function(body, rotation, point) {\n        if (!point) {\n            Body.setAngle(body, body.angle + rotation);\n        } else {\n            var cos = Math.cos(rotation),\n                sin = Math.sin(rotation),\n                dx = body.position.x - point.x,\n                dy = body.position.y - point.y;\n                \n            Body.setPosition(body, {\n                x: point.x + (dx * cos - dy * sin),\n                y: point.y + (dx * sin + dy * cos)\n            });\n\n            Body.setAngle(body, body.angle + rotation);\n        }\n    };\n\n    /**\n     * Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).\n     * @method scale\n     * @param {body} body\n     * @param {number} scaleX\n     * @param {number} scaleY\n     * @param {vector} [point]\n     */\n    Body.scale = function(body, scaleX, scaleY, point) {\n        for (var i = 0; i < body.parts.length; i++) {\n            var part = body.parts[i];\n\n            // scale vertices\n            Vertices.scale(part.vertices, scaleX, scaleY, body.position);\n\n            // update properties\n            part.axes = Axes.fromVertices(part.vertices);\n\n            if (!body.isStatic) {\n                part.area = Vertices.area(part.vertices);\n                Body.setMass(part, body.density * part.area);\n\n                // update inertia (requires vertices to be at origin)\n                Vertices.translate(part.vertices, { x: -part.position.x, y: -part.position.y });\n                Body.setInertia(part, Vertices.inertia(part.vertices, part.mass));\n                Vertices.translate(part.vertices, { x: part.position.x, y: part.position.y });\n            }\n\n            // update bounds\n            Bounds.update(part.bounds, part.vertices, body.velocity);\n        }\n\n        // handle circles\n        if (body.circleRadius) { \n            if (scaleX === scaleY) {\n                body.circleRadius *= scaleX;\n            } else {\n                // body is no longer a circle\n                body.circleRadius = null;\n            }\n        }\n\n        if (!body.isStatic) {\n            var total = _totalProperties(body);\n            body.area = total.area;\n            Body.setMass(body, total.mass);\n            Body.setInertia(body, total.inertia);\n        }\n    };\n\n    /**\n     * Performs a simulation step for the given `body`, including updating position and angle using Verlet integration.\n     * @method update\n     * @param {body} body\n     * @param {number} deltaTime\n     * @param {number} timeScale\n     * @param {number} correction\n     */\n    Body.update = function(body, deltaTime, timeScale, correction) {\n        var deltaTimeSquared = Math.pow(deltaTime * timeScale * body.timeScale, 2);\n\n        // from the previous step\n        var frictionAir = 1 - body.frictionAir * timeScale * body.timeScale,\n            velocityPrevX = body.position.x - body.positionPrev.x,\n            velocityPrevY = body.position.y - body.positionPrev.y;\n\n        // update velocity with Verlet integration\n        body.velocity.x = (velocityPrevX * frictionAir * correction) + (body.force.x / body.mass) * deltaTimeSquared;\n        body.velocity.y = (velocityPrevY * frictionAir * correction) + (body.force.y / body.mass) * deltaTimeSquared;\n\n        body.positionPrev.x = body.position.x;\n        body.positionPrev.y = body.position.y;\n        body.position.x += body.velocity.x;\n        body.position.y += body.velocity.y;\n\n        // update angular velocity with Verlet integration\n        body.angularVelocity = ((body.angle - body.anglePrev) * frictionAir * correction) + (body.torque / body.inertia) * deltaTimeSquared;\n        body.anglePrev = body.angle;\n        body.angle += body.angularVelocity;\n\n        // track speed and acceleration\n        body.speed = Vector.magnitude(body.velocity);\n        body.angularSpeed = Math.abs(body.angularVelocity);\n\n        // transform the body geometry\n        for (var i = 0; i < body.parts.length; i++) {\n            var part = body.parts[i];\n\n            Vertices.translate(part.vertices, body.velocity);\n            \n            if (i > 0) {\n                part.position.x += body.velocity.x;\n                part.position.y += body.velocity.y;\n            }\n\n            if (body.angularVelocity !== 0) {\n                Vertices.rotate(part.vertices, body.angularVelocity, body.position);\n                Axes.rotate(part.axes, body.angularVelocity);\n                if (i > 0) {\n                    Vector.rotateAbout(part.position, body.angularVelocity, body.position, part.position);\n                }\n            }\n\n            Bounds.update(part.bounds, part.vertices, body.velocity);\n        }\n    };\n\n    /**\n     * Applies a force to a body from a given world-space position, including resulting torque.\n     * @method applyForce\n     * @param {body} body\n     * @param {vector} position\n     * @param {vector} force\n     */\n    Body.applyForce = function(body, position, force) {\n        body.force.x += force.x;\n        body.force.y += force.y;\n        var offset = { x: position.x - body.position.x, y: position.y - body.position.y };\n        body.torque += offset.x * force.y - offset.y * force.x;\n    };\n\n    /**\n     * Returns the sums of the properties of all compound parts of the parent body.\n     * @method _totalProperties\n     * @private\n     * @param {body} body\n     * @return {}\n     */\n    var _totalProperties = function(body) {\n        // from equations at:\n        // https://ecourses.ou.edu/cgi-bin/ebook.cgi?doc=&topic=st&chap_sec=07.2&page=theory\n        // http://output.to/sideway/default.asp?qno=121100087\n\n        var properties = {\n            mass: 0,\n            area: 0,\n            inertia: 0,\n            centre: { x: 0, y: 0 }\n        };\n\n        // sum the properties of all compound parts of the parent body\n        for (var i = body.parts.length === 1 ? 0 : 1; i < body.parts.length; i++) {\n            var part = body.parts[i];\n            properties.mass += part.mass;\n            properties.area += part.area;\n            properties.inertia += part.inertia;\n            properties.centre = Vector.add(properties.centre, \n                                           Vector.mult(part.position, part.mass !== Infinity ? part.mass : 1));\n        }\n\n        properties.centre = Vector.div(properties.centre, \n                                       properties.mass !== Infinity ? properties.mass : body.parts.length);\n\n        return properties;\n    };\n\n    /*\n    *\n    *  Events Documentation\n    *\n    */\n\n    /**\n    * Fired when a body starts sleeping (where `this` is the body).\n    *\n    * @event sleepStart\n    * @this {body} The body that has started sleeping\n    * @param {} event An event object\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when a body ends sleeping (where `this` is the body).\n    *\n    * @event sleepEnd\n    * @this {body} The body that has ended sleeping\n    * @param {} event An event object\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * An integer `Number` uniquely identifying number generated in `Body.create` by `Common.nextId`.\n     *\n     * @property id\n     * @type number\n     */\n\n    /**\n     * A `String` denoting the type of object.\n     *\n     * @property type\n     * @type string\n     * @default \"body\"\n     * @readOnly\n     */\n\n    /**\n     * An arbitrary `String` name to help the user identify and manage bodies.\n     *\n     * @property label\n     * @type string\n     * @default \"Body\"\n     */\n\n    /**\n     * An array of bodies that make up this body. \n     * The first body in the array must always be a self reference to the current body instance.\n     * All bodies in the `parts` array together form a single rigid compound body.\n     * Parts are allowed to overlap, have gaps or holes or even form concave bodies.\n     * Parts themselves should never be added to a `World`, only the parent body should be.\n     * Use `Body.setParts` when setting parts to ensure correct updates of all properties.\n     *\n     * @property parts\n     * @type body[]\n     */\n\n    /**\n     * An object reserved for storing plugin-specific properties.\n     *\n     * @property plugin\n     * @type {}\n     */\n\n    /**\n     * A self reference if the body is _not_ a part of another body.\n     * Otherwise this is a reference to the body that this is a part of.\n     * See `body.parts`.\n     *\n     * @property parent\n     * @type body\n     */\n\n    /**\n     * A `Number` specifying the angle of the body, in radians.\n     *\n     * @property angle\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * An array of `Vector` objects that specify the convex hull of the rigid body.\n     * These should be provided about the origin `(0, 0)`. E.g.\n     *\n     *     [{ x: 0, y: 0 }, { x: 25, y: 50 }, { x: 50, y: 0 }]\n     *\n     * When passed via `Body.create`, the vertices are translated relative to `body.position` (i.e. world-space, and constantly updated by `Body.update` during simulation).\n     * The `Vector` objects are also augmented with additional properties required for efficient collision detection. \n     *\n     * Other properties such as `inertia` and `bounds` are automatically calculated from the passed vertices (unless provided via `options`).\n     * Concave hulls are not currently supported. The module `Matter.Vertices` contains useful methods for working with vertices.\n     *\n     * @property vertices\n     * @type vector[]\n     */\n\n    /**\n     * A `Vector` that specifies the current world-space position of the body.\n     *\n     * @property position\n     * @type vector\n     * @default { x: 0, y: 0 }\n     */\n\n    /**\n     * A `Vector` that specifies the force to apply in the current step. It is zeroed after every `Body.update`. See also `Body.applyForce`.\n     *\n     * @property force\n     * @type vector\n     * @default { x: 0, y: 0 }\n     */\n\n    /**\n     * A `Number` that specifies the torque (turning force) to apply in the current step. It is zeroed after every `Body.update`.\n     *\n     * @property torque\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Number` that _measures_ the current speed of the body after the last `Body.update`. It is read-only and always positive (it's the magnitude of `body.velocity`).\n     *\n     * @readOnly\n     * @property speed\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Number` that _measures_ the current angular speed of the body after the last `Body.update`. It is read-only and always positive (it's the magnitude of `body.angularVelocity`).\n     *\n     * @readOnly\n     * @property angularSpeed\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Vector` that _measures_ the current velocity of the body after the last `Body.update`. It is read-only. \n     * If you need to modify a body's velocity directly, you should either apply a force or simply change the body's `position` (as the engine uses position-Verlet integration).\n     *\n     * @readOnly\n     * @property velocity\n     * @type vector\n     * @default { x: 0, y: 0 }\n     */\n\n    /**\n     * A `Number` that _measures_ the current angular velocity of the body after the last `Body.update`. It is read-only. \n     * If you need to modify a body's angular velocity directly, you should apply a torque or simply change the body's `angle` (as the engine uses position-Verlet integration).\n     *\n     * @readOnly\n     * @property angularVelocity\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A flag that indicates whether a body is considered static. A static body can never change position or angle and is completely fixed.\n     * If you need to set a body as static after its creation, you should use `Body.setStatic` as this requires more than just setting this flag.\n     *\n     * @property isStatic\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * A flag that indicates whether a body is a sensor. Sensor triggers collision events, but doesn't react with colliding body physically.\n     *\n     * @property isSensor\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * A flag that indicates whether the body is considered sleeping. A sleeping body acts similar to a static body, except it is only temporary and can be awoken.\n     * If you need to set a body as sleeping, you should use `Sleeping.set` as this requires more than just setting this flag.\n     *\n     * @property isSleeping\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * A `Number` that _measures_ the amount of movement a body currently has (a combination of `speed` and `angularSpeed`). It is read-only and always positive.\n     * It is used and updated by the `Matter.Sleeping` module during simulation to decide if a body has come to rest.\n     *\n     * @readOnly\n     * @property motion\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Number` that defines the number of updates in which this body must have near-zero velocity before it is set as sleeping by the `Matter.Sleeping` module (if sleeping is enabled by the engine).\n     *\n     * @property sleepThreshold\n     * @type number\n     * @default 60\n     */\n\n    /**\n     * A `Number` that defines the density of the body, that is its mass per unit area.\n     * If you pass the density via `Body.create` the `mass` property is automatically calculated for you based on the size (area) of the object.\n     * This is generally preferable to simply setting mass and allows for more intuitive definition of materials (e.g. rock has a higher density than wood).\n     *\n     * @property density\n     * @type number\n     * @default 0.001\n     */\n\n    /**\n     * A `Number` that defines the mass of the body, although it may be more appropriate to specify the `density` property instead.\n     * If you modify this value, you must also modify the `body.inverseMass` property (`1 / mass`).\n     *\n     * @property mass\n     * @type number\n     */\n\n    /**\n     * A `Number` that defines the inverse mass of the body (`1 / mass`).\n     * If you modify this value, you must also modify the `body.mass` property.\n     *\n     * @property inverseMass\n     * @type number\n     */\n\n    /**\n     * A `Number` that defines the moment of inertia (i.e. second moment of area) of the body.\n     * It is automatically calculated from the given convex hull (`vertices` array) and density in `Body.create`.\n     * If you modify this value, you must also modify the `body.inverseInertia` property (`1 / inertia`).\n     *\n     * @property inertia\n     * @type number\n     */\n\n    /**\n     * A `Number` that defines the inverse moment of inertia of the body (`1 / inertia`).\n     * If you modify this value, you must also modify the `body.inertia` property.\n     *\n     * @property inverseInertia\n     * @type number\n     */\n\n    /**\n     * A `Number` that defines the restitution (elasticity) of the body. The value is always positive and is in the range `(0, 1)`.\n     * A value of `0` means collisions may be perfectly inelastic and no bouncing may occur. \n     * A value of `0.8` means the body may bounce back with approximately 80% of its kinetic energy.\n     * Note that collision response is based on _pairs_ of bodies, and that `restitution` values are _combined_ with the following formula:\n     *\n     *     Math.max(bodyA.restitution, bodyB.restitution)\n     *\n     * @property restitution\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Number` that defines the friction of the body. The value is always positive and is in the range `(0, 1)`.\n     * A value of `0` means that the body may slide indefinitely.\n     * A value of `1` means the body may come to a stop almost instantly after a force is applied.\n     *\n     * The effects of the value may be non-linear. \n     * High values may be unstable depending on the body.\n     * The engine uses a Coulomb friction model including static and kinetic friction.\n     * Note that collision response is based on _pairs_ of bodies, and that `friction` values are _combined_ with the following formula:\n     *\n     *     Math.min(bodyA.friction, bodyB.friction)\n     *\n     * @property friction\n     * @type number\n     * @default 0.1\n     */\n\n    /**\n     * A `Number` that defines the static friction of the body (in the Coulomb friction model). \n     * A value of `0` means the body will never 'stick' when it is nearly stationary and only dynamic `friction` is used.\n     * The higher the value (e.g. `10`), the more force it will take to initially get the body moving when nearly stationary.\n     * This value is multiplied with the `friction` property to make it easier to change `friction` and maintain an appropriate amount of static friction.\n     *\n     * @property frictionStatic\n     * @type number\n     * @default 0.5\n     */\n\n    /**\n     * A `Number` that defines the air friction of the body (air resistance). \n     * A value of `0` means the body will never slow as it moves through space.\n     * The higher the value, the faster a body slows when moving through space.\n     * The effects of the value are non-linear. \n     *\n     * @property frictionAir\n     * @type number\n     * @default 0.01\n     */\n\n    /**\n     * An `Object` that specifies the collision filtering properties of this body.\n     *\n     * Collisions between two bodies will obey the following rules:\n     * - If the two bodies have the same non-zero value of `collisionFilter.group`,\n     *   they will always collide if the value is positive, and they will never collide\n     *   if the value is negative.\n     * - If the two bodies have different values of `collisionFilter.group` or if one\n     *   (or both) of the bodies has a value of 0, then the category/mask rules apply as follows:\n     *\n     * Each body belongs to a collision category, given by `collisionFilter.category`. This\n     * value is used as a bit field and the category should have only one bit set, meaning that\n     * the value of this property is a power of two in the range [1, 2^31]. Thus, there are 32\n     * different collision categories available.\n     *\n     * Each body also defines a collision bitmask, given by `collisionFilter.mask` which specifies\n     * the categories it collides with (the value is the bitwise AND value of all these categories).\n     *\n     * Using the category/mask rules, two bodies `A` and `B` collide if each includes the other's\n     * category in its mask, i.e. `(categoryA & maskB) !== 0` and `(categoryB & maskA) !== 0`\n     * are both true.\n     *\n     * @property collisionFilter\n     * @type object\n     */\n\n    /**\n     * An Integer `Number`, that specifies the collision group this body belongs to.\n     * See `body.collisionFilter` for more information.\n     *\n     * @property collisionFilter.group\n     * @type object\n     * @default 0\n     */\n\n    /**\n     * A bit field that specifies the collision category this body belongs to.\n     * The category value should have only one bit set, for example `0x0001`.\n     * This means there are up to 32 unique collision categories available.\n     * See `body.collisionFilter` for more information.\n     *\n     * @property collisionFilter.category\n     * @type object\n     * @default 1\n     */\n\n    /**\n     * A bit mask that specifies the collision categories this body may collide with.\n     * See `body.collisionFilter` for more information.\n     *\n     * @property collisionFilter.mask\n     * @type object\n     * @default -1\n     */\n\n    /**\n     * A `Number` that specifies a tolerance on how far a body is allowed to 'sink' or rotate into other bodies.\n     * Avoid changing this value unless you understand the purpose of `slop` in physics engines.\n     * The default should generally suffice, although very large bodies may require larger values for stable stacking.\n     *\n     * @property slop\n     * @type number\n     * @default 0.05\n     */\n\n    /**\n     * A `Number` that allows per-body time scaling, e.g. a force-field where bodies inside are in slow-motion, while others are at full speed.\n     *\n     * @property timeScale\n     * @type number\n     * @default 1\n     */\n\n    /**\n     * An `Object` that defines the rendering properties to be consumed by the module `Matter.Render`.\n     *\n     * @property render\n     * @type object\n     */\n\n    /**\n     * A flag that indicates if the body should be rendered.\n     *\n     * @property render.visible\n     * @type boolean\n     * @default true\n     */\n\n    /**\n     * Sets the opacity to use when rendering.\n     *\n     * @property render.opacity\n     * @type number\n     * @default 1\n    */\n\n    /**\n     * An `Object` that defines the sprite properties to use when rendering, if any.\n     *\n     * @property render.sprite\n     * @type object\n     */\n\n    /**\n     * An `String` that defines the path to the image to use as the sprite texture, if any.\n     *\n     * @property render.sprite.texture\n     * @type string\n     */\n     \n    /**\n     * A `Number` that defines the scaling in the x-axis for the sprite, if any.\n     *\n     * @property render.sprite.xScale\n     * @type number\n     * @default 1\n     */\n\n    /**\n     * A `Number` that defines the scaling in the y-axis for the sprite, if any.\n     *\n     * @property render.sprite.yScale\n     * @type number\n     * @default 1\n     */\n\n     /**\n      * A `Number` that defines the offset in the x-axis for the sprite (normalised by texture width).\n      *\n      * @property render.sprite.xOffset\n      * @type number\n      * @default 0\n      */\n\n     /**\n      * A `Number` that defines the offset in the y-axis for the sprite (normalised by texture height).\n      *\n      * @property render.sprite.yOffset\n      * @type number\n      * @default 0\n      */\n\n    /**\n     * A `Number` that defines the line width to use when rendering the body outline (if a sprite is not defined).\n     * A value of `0` means no outline will be rendered.\n     *\n     * @property render.lineWidth\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `String` that defines the fill style to use when rendering the body (if a sprite is not defined).\n     * It is the same as when using a canvas, so it accepts CSS style property values.\n     *\n     * @property render.fillStyle\n     * @type string\n     * @default a random colour\n     */\n\n    /**\n     * A `String` that defines the stroke style to use when rendering the body outline (if a sprite is not defined).\n     * It is the same as when using a canvas, so it accepts CSS style property values.\n     *\n     * @property render.strokeStyle\n     * @type string\n     * @default a random colour\n     */\n\n    /**\n     * An array of unique axis vectors (edge normals) used for collision detection.\n     * These are automatically calculated from the given convex hull (`vertices` array) in `Body.create`.\n     * They are constantly updated by `Body.update` during the simulation.\n     *\n     * @property axes\n     * @type vector[]\n     */\n     \n    /**\n     * A `Number` that _measures_ the area of the body's convex hull, calculated at creation by `Body.create`.\n     *\n     * @property area\n     * @type string\n     * @default \n     */\n\n    /**\n     * A `Bounds` object that defines the AABB region for the body.\n     * It is automatically calculated from the given convex hull (`vertices` array) in `Body.create` and constantly updated by `Body.update` during simulation.\n     *\n     * @property bounds\n     * @type bounds\n     */\n\n})();\n\n},{\"../core/Common\":14,\"../core/Sleeping\":22,\"../geometry/Axes\":25,\"../geometry/Bounds\":26,\"../geometry/Vector\":28,\"../geometry/Vertices\":29,\"../render/Render\":31}],2:[function(_dereq_,module,exports){\n/**\n* The `Matter.Composite` module contains methods for creating and manipulating composite bodies.\n* A composite body is a collection of `Matter.Body`, `Matter.Constraint` and other `Matter.Composite`, therefore composites form a tree structure.\n* It is important to use the functions in this module to modify composites, rather than directly modifying their properties.\n* Note that the `Matter.World` object is also a type of `Matter.Composite` and as such all composite methods here can also operate on a `Matter.World`.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Composite\n*/\n\nvar Composite = {};\n\nmodule.exports = Composite;\n\nvar Events = _dereq_('../core/Events');\nvar Common = _dereq_('../core/Common');\nvar Body = _dereq_('./Body');\n\n(function() {\n\n    /**\n     * Creates a new composite. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properites section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {} [options]\n     * @return {composite} A new composite\n     */\n    Composite.create = function(options) {\n        return Common.extend({ \n            id: Common.nextId(),\n            type: 'composite',\n            parent: null,\n            isModified: false,\n            bodies: [], \n            constraints: [], \n            composites: [],\n            label: 'Composite',\n            plugin: {}\n        }, options);\n    };\n\n    /**\n     * Sets the composite's `isModified` flag. \n     * If `updateParents` is true, all parents will be set (default: false).\n     * If `updateChildren` is true, all children will be set (default: false).\n     * @method setModified\n     * @param {composite} composite\n     * @param {boolean} isModified\n     * @param {boolean} [updateParents=false]\n     * @param {boolean} [updateChildren=false]\n     */\n    Composite.setModified = function(composite, isModified, updateParents, updateChildren) {\n        composite.isModified = isModified;\n\n        if (updateParents && composite.parent) {\n            Composite.setModified(composite.parent, isModified, updateParents, updateChildren);\n        }\n\n        if (updateChildren) {\n            for(var i = 0; i < composite.composites.length; i++) {\n                var childComposite = composite.composites[i];\n                Composite.setModified(childComposite, isModified, updateParents, updateChildren);\n            }\n        }\n    };\n\n    /**\n     * Generic add function. Adds one or many body(s), constraint(s) or a composite(s) to the given composite.\n     * Triggers `beforeAdd` and `afterAdd` events on the `composite`.\n     * @method add\n     * @param {composite} composite\n     * @param {} object\n     * @return {composite} The original composite with the objects added\n     */\n    Composite.add = function(composite, object) {\n        var objects = [].concat(object);\n\n        Events.trigger(composite, 'beforeAdd', { object: object });\n\n        for (var i = 0; i < objects.length; i++) {\n            var obj = objects[i];\n\n            switch (obj.type) {\n\n            case 'body':\n                // skip adding compound parts\n                if (obj.parent !== obj) {\n                    Common.warn('Composite.add: skipped adding a compound body part (you must add its parent instead)');\n                    break;\n                }\n\n                Composite.addBody(composite, obj);\n                break;\n            case 'constraint':\n                Composite.addConstraint(composite, obj);\n                break;\n            case 'composite':\n                Composite.addComposite(composite, obj);\n                break;\n            case 'mouseConstraint':\n                Composite.addConstraint(composite, obj.constraint);\n                break;\n\n            }\n        }\n\n        Events.trigger(composite, 'afterAdd', { object: object });\n\n        return composite;\n    };\n\n    /**\n     * Generic remove function. Removes one or many body(s), constraint(s) or a composite(s) to the given composite.\n     * Optionally searching its children recursively.\n     * Triggers `beforeRemove` and `afterRemove` events on the `composite`.\n     * @method remove\n     * @param {composite} composite\n     * @param {} object\n     * @param {boolean} [deep=false]\n     * @return {composite} The original composite with the objects removed\n     */\n    Composite.remove = function(composite, object, deep) {\n        var objects = [].concat(object);\n\n        Events.trigger(composite, 'beforeRemove', { object: object });\n\n        for (var i = 0; i < objects.length; i++) {\n            var obj = objects[i];\n\n            switch (obj.type) {\n\n            case 'body':\n                Composite.removeBody(composite, obj, deep);\n                break;\n            case 'constraint':\n                Composite.removeConstraint(composite, obj, deep);\n                break;\n            case 'composite':\n                Composite.removeComposite(composite, obj, deep);\n                break;\n            case 'mouseConstraint':\n                Composite.removeConstraint(composite, obj.constraint);\n                break;\n\n            }\n        }\n\n        Events.trigger(composite, 'afterRemove', { object: object });\n\n        return composite;\n    };\n\n    /**\n     * Adds a composite to the given composite.\n     * @private\n     * @method addComposite\n     * @param {composite} compositeA\n     * @param {composite} compositeB\n     * @return {composite} The original compositeA with the objects from compositeB added\n     */\n    Composite.addComposite = function(compositeA, compositeB) {\n        compositeA.composites.push(compositeB);\n        compositeB.parent = compositeA;\n        Composite.setModified(compositeA, true, true, false);\n        return compositeA;\n    };\n\n    /**\n     * Removes a composite from the given composite, and optionally searching its children recursively.\n     * @private\n     * @method removeComposite\n     * @param {composite} compositeA\n     * @param {composite} compositeB\n     * @param {boolean} [deep=false]\n     * @return {composite} The original compositeA with the composite removed\n     */\n    Composite.removeComposite = function(compositeA, compositeB, deep) {\n        var position = Common.indexOf(compositeA.composites, compositeB);\n        if (position !== -1) {\n            Composite.removeCompositeAt(compositeA, position);\n            Composite.setModified(compositeA, true, true, false);\n        }\n\n        if (deep) {\n            for (var i = 0; i < compositeA.composites.length; i++){\n                Composite.removeComposite(compositeA.composites[i], compositeB, true);\n            }\n        }\n\n        return compositeA;\n    };\n\n    /**\n     * Removes a composite from the given composite.\n     * @private\n     * @method removeCompositeAt\n     * @param {composite} composite\n     * @param {number} position\n     * @return {composite} The original composite with the composite removed\n     */\n    Composite.removeCompositeAt = function(composite, position) {\n        composite.composites.splice(position, 1);\n        Composite.setModified(composite, true, true, false);\n        return composite;\n    };\n\n    /**\n     * Adds a body to the given composite.\n     * @private\n     * @method addBody\n     * @param {composite} composite\n     * @param {body} body\n     * @return {composite} The original composite with the body added\n     */\n    Composite.addBody = function(composite, body) {\n        composite.bodies.push(body);\n        Composite.setModified(composite, true, true, false);\n        return composite;\n    };\n\n    /**\n     * Removes a body from the given composite, and optionally searching its children recursively.\n     * @private\n     * @method removeBody\n     * @param {composite} composite\n     * @param {body} body\n     * @param {boolean} [deep=false]\n     * @return {composite} The original composite with the body removed\n     */\n    Composite.removeBody = function(composite, body, deep) {\n        var position = Common.indexOf(composite.bodies, body);\n        if (position !== -1) {\n            Composite.removeBodyAt(composite, position);\n            Composite.setModified(composite, true, true, false);\n        }\n\n        if (deep) {\n            for (var i = 0; i < composite.composites.length; i++){\n                Composite.removeBody(composite.composites[i], body, true);\n            }\n        }\n\n        return composite;\n    };\n\n    /**\n     * Removes a body from the given composite.\n     * @private\n     * @method removeBodyAt\n     * @param {composite} composite\n     * @param {number} position\n     * @return {composite} The original composite with the body removed\n     */\n    Composite.removeBodyAt = function(composite, position) {\n        composite.bodies.splice(position, 1);\n        Composite.setModified(composite, true, true, false);\n        return composite;\n    };\n\n    /**\n     * Adds a constraint to the given composite.\n     * @private\n     * @method addConstraint\n     * @param {composite} composite\n     * @param {constraint} constraint\n     * @return {composite} The original composite with the constraint added\n     */\n    Composite.addConstraint = function(composite, constraint) {\n        composite.constraints.push(constraint);\n        Composite.setModified(composite, true, true, false);\n        return composite;\n    };\n\n    /**\n     * Removes a constraint from the given composite, and optionally searching its children recursively.\n     * @private\n     * @method removeConstraint\n     * @param {composite} composite\n     * @param {constraint} constraint\n     * @param {boolean} [deep=false]\n     * @return {composite} The original composite with the constraint removed\n     */\n    Composite.removeConstraint = function(composite, constraint, deep) {\n        var position = Common.indexOf(composite.constraints, constraint);\n        if (position !== -1) {\n            Composite.removeConstraintAt(composite, position);\n        }\n\n        if (deep) {\n            for (var i = 0; i < composite.composites.length; i++){\n                Composite.removeConstraint(composite.composites[i], constraint, true);\n            }\n        }\n\n        return composite;\n    };\n\n    /**\n     * Removes a body from the given composite.\n     * @private\n     * @method removeConstraintAt\n     * @param {composite} composite\n     * @param {number} position\n     * @return {composite} The original composite with the constraint removed\n     */\n    Composite.removeConstraintAt = function(composite, position) {\n        composite.constraints.splice(position, 1);\n        Composite.setModified(composite, true, true, false);\n        return composite;\n    };\n\n    /**\n     * Removes all bodies, constraints and composites from the given composite.\n     * Optionally clearing its children recursively.\n     * @method clear\n     * @param {composite} composite\n     * @param {boolean} keepStatic\n     * @param {boolean} [deep=false]\n     */\n    Composite.clear = function(composite, keepStatic, deep) {\n        if (deep) {\n            for (var i = 0; i < composite.composites.length; i++){\n                Composite.clear(composite.composites[i], keepStatic, true);\n            }\n        }\n        \n        if (keepStatic) {\n            composite.bodies = composite.bodies.filter(function(body) { return body.isStatic; });\n        } else {\n            composite.bodies.length = 0;\n        }\n\n        composite.constraints.length = 0;\n        composite.composites.length = 0;\n        Composite.setModified(composite, true, true, false);\n\n        return composite;\n    };\n\n    /**\n     * Returns all bodies in the given composite, including all bodies in its children, recursively.\n     * @method allBodies\n     * @param {composite} composite\n     * @return {body[]} All the bodies\n     */\n    Composite.allBodies = function(composite) {\n        var bodies = [].concat(composite.bodies);\n\n        for (var i = 0; i < composite.composites.length; i++)\n            bodies = bodies.concat(Composite.allBodies(composite.composites[i]));\n\n        return bodies;\n    };\n\n    /**\n     * Returns all constraints in the given composite, including all constraints in its children, recursively.\n     * @method allConstraints\n     * @param {composite} composite\n     * @return {constraint[]} All the constraints\n     */\n    Composite.allConstraints = function(composite) {\n        var constraints = [].concat(composite.constraints);\n\n        for (var i = 0; i < composite.composites.length; i++)\n            constraints = constraints.concat(Composite.allConstraints(composite.composites[i]));\n\n        return constraints;\n    };\n\n    /**\n     * Returns all composites in the given composite, including all composites in its children, recursively.\n     * @method allComposites\n     * @param {composite} composite\n     * @return {composite[]} All the composites\n     */\n    Composite.allComposites = function(composite) {\n        var composites = [].concat(composite.composites);\n\n        for (var i = 0; i < composite.composites.length; i++)\n            composites = composites.concat(Composite.allComposites(composite.composites[i]));\n\n        return composites;\n    };\n\n    /**\n     * Searches the composite recursively for an object matching the type and id supplied, null if not found.\n     * @method get\n     * @param {composite} composite\n     * @param {number} id\n     * @param {string} type\n     * @return {object} The requested object, if found\n     */\n    Composite.get = function(composite, id, type) {\n        var objects,\n            object;\n\n        switch (type) {\n        case 'body':\n            objects = Composite.allBodies(composite);\n            break;\n        case 'constraint':\n            objects = Composite.allConstraints(composite);\n            break;\n        case 'composite':\n            objects = Composite.allComposites(composite).concat(composite);\n            break;\n        }\n\n        if (!objects)\n            return null;\n\n        object = objects.filter(function(object) { \n            return object.id.toString() === id.toString(); \n        });\n\n        return object.length === 0 ? null : object[0];\n    };\n\n    /**\n     * Moves the given object(s) from compositeA to compositeB (equal to a remove followed by an add).\n     * @method move\n     * @param {compositeA} compositeA\n     * @param {object[]} objects\n     * @param {compositeB} compositeB\n     * @return {composite} Returns compositeA\n     */\n    Composite.move = function(compositeA, objects, compositeB) {\n        Composite.remove(compositeA, objects);\n        Composite.add(compositeB, objects);\n        return compositeA;\n    };\n\n    /**\n     * Assigns new ids for all objects in the composite, recursively.\n     * @method rebase\n     * @param {composite} composite\n     * @return {composite} Returns composite\n     */\n    Composite.rebase = function(composite) {\n        var objects = Composite.allBodies(composite)\n                        .concat(Composite.allConstraints(composite))\n                        .concat(Composite.allComposites(composite));\n\n        for (var i = 0; i < objects.length; i++) {\n            objects[i].id = Common.nextId();\n        }\n\n        Composite.setModified(composite, true, true, false);\n\n        return composite;\n    };\n\n    /**\n     * Translates all children in the composite by a given vector relative to their current positions, \n     * without imparting any velocity.\n     * @method translate\n     * @param {composite} composite\n     * @param {vector} translation\n     * @param {bool} [recursive=true]\n     */\n    Composite.translate = function(composite, translation, recursive) {\n        var bodies = recursive ? Composite.allBodies(composite) : composite.bodies;\n\n        for (var i = 0; i < bodies.length; i++) {\n            Body.translate(bodies[i], translation);\n        }\n\n        Composite.setModified(composite, true, true, false);\n\n        return composite;\n    };\n\n    /**\n     * Rotates all children in the composite by a given angle about the given point, without imparting any angular velocity.\n     * @method rotate\n     * @param {composite} composite\n     * @param {number} rotation\n     * @param {vector} point\n     * @param {bool} [recursive=true]\n     */\n    Composite.rotate = function(composite, rotation, point, recursive) {\n        var cos = Math.cos(rotation),\n            sin = Math.sin(rotation),\n            bodies = recursive ? Composite.allBodies(composite) : composite.bodies;\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                dx = body.position.x - point.x,\n                dy = body.position.y - point.y;\n                \n            Body.setPosition(body, {\n                x: point.x + (dx * cos - dy * sin),\n                y: point.y + (dx * sin + dy * cos)\n            });\n\n            Body.rotate(body, rotation);\n        }\n\n        Composite.setModified(composite, true, true, false);\n\n        return composite;\n    };\n\n    /**\n     * Scales all children in the composite, including updating physical properties (mass, area, axes, inertia), from a world-space point.\n     * @method scale\n     * @param {composite} composite\n     * @param {number} scaleX\n     * @param {number} scaleY\n     * @param {vector} point\n     * @param {bool} [recursive=true]\n     */\n    Composite.scale = function(composite, scaleX, scaleY, point, recursive) {\n        var bodies = recursive ? Composite.allBodies(composite) : composite.bodies;\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                dx = body.position.x - point.x,\n                dy = body.position.y - point.y;\n                \n            Body.setPosition(body, {\n                x: point.x + dx * scaleX,\n                y: point.y + dy * scaleY\n            });\n\n            Body.scale(body, scaleX, scaleY);\n        }\n\n        Composite.setModified(composite, true, true, false);\n\n        return composite;\n    };\n\n    /**\n     * Returns the union of the bounds of all of the composite's bodies.\n     * @method bounds\n     * @param {composite} composite The composite.\n     * @returns {bounds} The composite bounds.\n     */\n    Composite.bounds = function(composite) {\n        var bodies = Matter.Composite.allBodies(composite),\n            vertices = [];\n\n        for (var i = 0; i < bodies.length; i += 1) {\n            var body = bodies[i];\n            vertices.push(body.bounds.min, body.bounds.max);\n        }\n\n        return Matter.Bounds.create(vertices);\n    };\n\n    /*\n    *\n    *  Events Documentation\n    *\n    */\n\n    /**\n    * Fired when a call to `Composite.add` is made, before objects have been added.\n    *\n    * @event beforeAdd\n    * @param {} event An event object\n    * @param {} event.object The object(s) to be added (may be a single body, constraint, composite or a mixed array of these)\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when a call to `Composite.add` is made, after objects have been added.\n    *\n    * @event afterAdd\n    * @param {} event An event object\n    * @param {} event.object The object(s) that have been added (may be a single body, constraint, composite or a mixed array of these)\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when a call to `Composite.remove` is made, before objects have been removed.\n    *\n    * @event beforeRemove\n    * @param {} event An event object\n    * @param {} event.object The object(s) to be removed (may be a single body, constraint, composite or a mixed array of these)\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when a call to `Composite.remove` is made, after objects have been removed.\n    *\n    * @event afterRemove\n    * @param {} event An event object\n    * @param {} event.object The object(s) that have been removed (may be a single body, constraint, composite or a mixed array of these)\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * An integer `Number` uniquely identifying number generated in `Composite.create` by `Common.nextId`.\n     *\n     * @property id\n     * @type number\n     */\n\n    /**\n     * A `String` denoting the type of object.\n     *\n     * @property type\n     * @type string\n     * @default \"composite\"\n     * @readOnly\n     */\n\n    /**\n     * An arbitrary `String` name to help the user identify and manage composites.\n     *\n     * @property label\n     * @type string\n     * @default \"Composite\"\n     */\n\n    /**\n     * A flag that specifies whether the composite has been modified during the current step.\n     * Most `Matter.Composite` methods will automatically set this flag to `true` to inform the engine of changes to be handled.\n     * If you need to change it manually, you should use the `Composite.setModified` method.\n     *\n     * @property isModified\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * The `Composite` that is the parent of this composite. It is automatically managed by the `Matter.Composite` methods.\n     *\n     * @property parent\n     * @type composite\n     * @default null\n     */\n\n    /**\n     * An array of `Body` that are _direct_ children of this composite.\n     * To add or remove bodies you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.\n     * If you wish to recursively find all descendants, you should use the `Composite.allBodies` method.\n     *\n     * @property bodies\n     * @type body[]\n     * @default []\n     */\n\n    /**\n     * An array of `Constraint` that are _direct_ children of this composite.\n     * To add or remove constraints you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.\n     * If you wish to recursively find all descendants, you should use the `Composite.allConstraints` method.\n     *\n     * @property constraints\n     * @type constraint[]\n     * @default []\n     */\n\n    /**\n     * An array of `Composite` that are _direct_ children of this composite.\n     * To add or remove composites you should use `Composite.add` and `Composite.remove` methods rather than directly modifying this property.\n     * If you wish to recursively find all descendants, you should use the `Composite.allComposites` method.\n     *\n     * @property composites\n     * @type composite[]\n     * @default []\n     */\n\n    /**\n     * An object reserved for storing plugin-specific properties.\n     *\n     * @property plugin\n     * @type {}\n     */\n\n})();\n\n},{\"../core/Common\":14,\"../core/Events\":16,\"./Body\":1}],3:[function(_dereq_,module,exports){\n/**\n* The `Matter.World` module contains methods for creating and manipulating the world composite.\n* A `Matter.World` is a `Matter.Composite` body, which is a collection of `Matter.Body`, `Matter.Constraint` and other `Matter.Composite`.\n* A `Matter.World` has a few additional properties including `gravity` and `bounds`.\n* It is important to use the functions in the `Matter.Composite` module to modify the world composite, rather than directly modifying its properties.\n* There are also a few methods here that alias those in `Matter.Composite` for easier readability.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class World\n* @extends Composite\n*/\n\nvar World = {};\n\nmodule.exports = World;\n\nvar Composite = _dereq_('./Composite');\nvar Constraint = _dereq_('../constraint/Constraint');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    /**\n     * Creates a new world composite. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @constructor\n     * @param {} options\n     * @return {world} A new world\n     */\n    World.create = function(options) {\n        var composite = Composite.create();\n\n        var defaults = {\n            label: 'World',\n            gravity: {\n                x: 0,\n                y: 1,\n                scale: 0.001\n            },\n            bounds: { \n                min: { x: -Infinity, y: -Infinity }, \n                max: { x: Infinity, y: Infinity } \n            }\n        };\n        \n        return Common.extend(composite, defaults, options);\n    };\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * The gravity to apply on the world.\n     *\n     * @property gravity\n     * @type object\n     */\n\n    /**\n     * The gravity x component.\n     *\n     * @property gravity.x\n     * @type object\n     * @default 0\n     */\n\n    /**\n     * The gravity y component.\n     *\n     * @property gravity.y\n     * @type object\n     * @default 1\n     */\n\n    /**\n     * The gravity scale factor.\n     *\n     * @property gravity.scale\n     * @type object\n     * @default 0.001\n     */\n\n    /**\n     * A `Bounds` object that defines the world bounds for collision detection.\n     *\n     * @property bounds\n     * @type bounds\n     * @default { min: { x: -Infinity, y: -Infinity }, max: { x: Infinity, y: Infinity } }\n     */\n\n    // World is a Composite body\n    // see src/module/Outro.js for these aliases:\n    \n    /**\n     * An alias for Composite.clear\n     * @method clear\n     * @param {world} world\n     * @param {boolean} keepStatic\n     */\n\n    /**\n     * An alias for Composite.add\n     * @method addComposite\n     * @param {world} world\n     * @param {composite} composite\n     * @return {world} The original world with the objects from composite added\n     */\n    \n     /**\n      * An alias for Composite.addBody\n      * @method addBody\n      * @param {world} world\n      * @param {body} body\n      * @return {world} The original world with the body added\n      */\n\n     /**\n      * An alias for Composite.addConstraint\n      * @method addConstraint\n      * @param {world} world\n      * @param {constraint} constraint\n      * @return {world} The original world with the constraint added\n      */\n\n})();\n\n},{\"../constraint/Constraint\":12,\"../core/Common\":14,\"./Composite\":2}],4:[function(_dereq_,module,exports){\n/**\n* The `Matter.Contact` module contains methods for creating and manipulating collision contacts.\n*\n* @class Contact\n*/\n\nvar Contact = {};\n\nmodule.exports = Contact;\n\n(function() {\n\n    /**\n     * Creates a new contact.\n     * @method create\n     * @param {vertex} vertex\n     * @return {contact} A new contact\n     */\n    Contact.create = function(vertex) {\n        return {\n            id: Contact.id(vertex),\n            vertex: vertex,\n            normalImpulse: 0,\n            tangentImpulse: 0\n        };\n    };\n    \n    /**\n     * Generates a contact id.\n     * @method id\n     * @param {vertex} vertex\n     * @return {string} Unique contactID\n     */\n    Contact.id = function(vertex) {\n        return vertex.body.id + '_' + vertex.index;\n    };\n\n})();\n\n},{}],5:[function(_dereq_,module,exports){\n/**\n* The `Matter.Detector` module contains methods for detecting collisions given a set of pairs.\n*\n* @class Detector\n*/\n\n// TODO: speculative contacts\n\nvar Detector = {};\n\nmodule.exports = Detector;\n\nvar SAT = _dereq_('./SAT');\nvar Pair = _dereq_('./Pair');\nvar Bounds = _dereq_('../geometry/Bounds');\n\n(function() {\n\n    /**\n     * Finds all collisions given a list of pairs.\n     * @method collisions\n     * @param {pair[]} broadphasePairs\n     * @param {engine} engine\n     * @return {array} collisions\n     */\n    Detector.collisions = function(broadphasePairs, engine) {\n        var collisions = [],\n            pairsTable = engine.pairs.table;\n\n        \n        for (var i = 0; i < broadphasePairs.length; i++) {\n            var bodyA = broadphasePairs[i][0], \n                bodyB = broadphasePairs[i][1];\n\n            if ((bodyA.isStatic || bodyA.isSleeping) && (bodyB.isStatic || bodyB.isSleeping))\n                continue;\n            \n            if (!Detector.canCollide(bodyA.collisionFilter, bodyB.collisionFilter))\n                continue;\n\n\n            // mid phase\n            if (Bounds.overlaps(bodyA.bounds, bodyB.bounds)) {\n                for (var j = bodyA.parts.length > 1 ? 1 : 0; j < bodyA.parts.length; j++) {\n                    var partA = bodyA.parts[j];\n\n                    for (var k = bodyB.parts.length > 1 ? 1 : 0; k < bodyB.parts.length; k++) {\n                        var partB = bodyB.parts[k];\n\n                        if ((partA === bodyA && partB === bodyB) || Bounds.overlaps(partA.bounds, partB.bounds)) {\n                            // find a previous collision we could reuse\n                            var pairId = Pair.id(partA, partB),\n                                pair = pairsTable[pairId],\n                                previousCollision;\n\n                            if (pair && pair.isActive) {\n                                previousCollision = pair.collision;\n                            } else {\n                                previousCollision = null;\n                            }\n\n                            // narrow phase\n                            var collision = SAT.collides(partA, partB, previousCollision);\n\n\n                            if (collision.collided) {\n                                collisions.push(collision);\n                            }\n                        }\n                    }\n                }\n            }\n        }\n\n        return collisions;\n    };\n\n    /**\n     * Returns `true` if both supplied collision filters will allow a collision to occur.\n     * See `body.collisionFilter` for more information.\n     * @method canCollide\n     * @param {} filterA\n     * @param {} filterB\n     * @return {bool} `true` if collision can occur\n     */\n    Detector.canCollide = function(filterA, filterB) {\n        if (filterA.group === filterB.group && filterA.group !== 0)\n            return filterA.group > 0;\n\n        return (filterA.mask & filterB.category) !== 0 && (filterB.mask & filterA.category) !== 0;\n    };\n\n})();\n\n},{\"../geometry/Bounds\":26,\"./Pair\":7,\"./SAT\":11}],6:[function(_dereq_,module,exports){\n/**\n* The `Matter.Grid` module contains methods for creating and manipulating collision broadphase grid structures.\n*\n* @class Grid\n*/\n\nvar Grid = {};\n\nmodule.exports = Grid;\n\nvar Pair = _dereq_('./Pair');\nvar Detector = _dereq_('./Detector');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    /**\n     * Creates a new grid.\n     * @method create\n     * @param {} options\n     * @return {grid} A new grid\n     */\n    Grid.create = function(options) {\n        var defaults = {\n            controller: Grid,\n            detector: Detector.collisions,\n            buckets: {},\n            pairs: {},\n            pairsList: [],\n            bucketWidth: 48,\n            bucketHeight: 48\n        };\n\n        return Common.extend(defaults, options);\n    };\n\n    /**\n     * The width of a single grid bucket.\n     *\n     * @property bucketWidth\n     * @type number\n     * @default 48\n     */\n\n    /**\n     * The height of a single grid bucket.\n     *\n     * @property bucketHeight\n     * @type number\n     * @default 48\n     */\n\n    /**\n     * Updates the grid.\n     * @method update\n     * @param {grid} grid\n     * @param {body[]} bodies\n     * @param {engine} engine\n     * @param {boolean} forceUpdate\n     */\n    Grid.update = function(grid, bodies, engine, forceUpdate) {\n        var i, col, row,\n            world = engine.world,\n            buckets = grid.buckets,\n            bucket,\n            bucketId,\n            gridChanged = false;\n\n\n        for (i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (body.isSleeping && !forceUpdate)\n                continue;\n\n            // don't update out of world bodies\n            if (body.bounds.max.x < world.bounds.min.x || body.bounds.min.x > world.bounds.max.x\n                || body.bounds.max.y < world.bounds.min.y || body.bounds.min.y > world.bounds.max.y)\n                continue;\n\n            var newRegion = _getRegion(grid, body);\n\n            // if the body has changed grid region\n            if (!body.region || newRegion.id !== body.region.id || forceUpdate) {\n\n\n                if (!body.region || forceUpdate)\n                    body.region = newRegion;\n\n                var union = _regionUnion(newRegion, body.region);\n\n                // update grid buckets affected by region change\n                // iterate over the union of both regions\n                for (col = union.startCol; col <= union.endCol; col++) {\n                    for (row = union.startRow; row <= union.endRow; row++) {\n                        bucketId = _getBucketId(col, row);\n                        bucket = buckets[bucketId];\n\n                        var isInsideNewRegion = (col >= newRegion.startCol && col <= newRegion.endCol\n                                                && row >= newRegion.startRow && row <= newRegion.endRow);\n\n                        var isInsideOldRegion = (col >= body.region.startCol && col <= body.region.endCol\n                                                && row >= body.region.startRow && row <= body.region.endRow);\n\n                        // remove from old region buckets\n                        if (!isInsideNewRegion && isInsideOldRegion) {\n                            if (isInsideOldRegion) {\n                                if (bucket)\n                                    _bucketRemoveBody(grid, bucket, body);\n                            }\n                        }\n\n                        // add to new region buckets\n                        if (body.region === newRegion || (isInsideNewRegion && !isInsideOldRegion) || forceUpdate) {\n                            if (!bucket)\n                                bucket = _createBucket(buckets, bucketId);\n                            _bucketAddBody(grid, bucket, body);\n                        }\n                    }\n                }\n\n                // set the new region\n                body.region = newRegion;\n\n                // flag changes so we can update pairs\n                gridChanged = true;\n            }\n        }\n\n        // update pairs list only if pairs changed (i.e. a body changed region)\n        if (gridChanged)\n            grid.pairsList = _createActivePairsList(grid);\n    };\n\n    /**\n     * Clears the grid.\n     * @method clear\n     * @param {grid} grid\n     */\n    Grid.clear = function(grid) {\n        grid.buckets = {};\n        grid.pairs = {};\n        grid.pairsList = [];\n    };\n\n    /**\n     * Finds the union of two regions.\n     * @method _regionUnion\n     * @private\n     * @param {} regionA\n     * @param {} regionB\n     * @return {} region\n     */\n    var _regionUnion = function(regionA, regionB) {\n        var startCol = Math.min(regionA.startCol, regionB.startCol),\n            endCol = Math.max(regionA.endCol, regionB.endCol),\n            startRow = Math.min(regionA.startRow, regionB.startRow),\n            endRow = Math.max(regionA.endRow, regionB.endRow);\n\n        return _createRegion(startCol, endCol, startRow, endRow);\n    };\n\n    /**\n     * Gets the region a given body falls in for a given grid.\n     * @method _getRegion\n     * @private\n     * @param {} grid\n     * @param {} body\n     * @return {} region\n     */\n    var _getRegion = function(grid, body) {\n        var bounds = body.bounds,\n            startCol = Math.floor(bounds.min.x / grid.bucketWidth),\n            endCol = Math.floor(bounds.max.x / grid.bucketWidth),\n            startRow = Math.floor(bounds.min.y / grid.bucketHeight),\n            endRow = Math.floor(bounds.max.y / grid.bucketHeight);\n\n        return _createRegion(startCol, endCol, startRow, endRow);\n    };\n\n    /**\n     * Creates a region.\n     * @method _createRegion\n     * @private\n     * @param {} startCol\n     * @param {} endCol\n     * @param {} startRow\n     * @param {} endRow\n     * @return {} region\n     */\n    var _createRegion = function(startCol, endCol, startRow, endRow) {\n        return { \n            id: startCol + ',' + endCol + ',' + startRow + ',' + endRow,\n            startCol: startCol, \n            endCol: endCol, \n            startRow: startRow, \n            endRow: endRow \n        };\n    };\n\n    /**\n     * Gets the bucket id at the given position.\n     * @method _getBucketId\n     * @private\n     * @param {} column\n     * @param {} row\n     * @return {string} bucket id\n     */\n    var _getBucketId = function(column, row) {\n        return 'C' + column + 'R' + row;\n    };\n\n    /**\n     * Creates a bucket.\n     * @method _createBucket\n     * @private\n     * @param {} buckets\n     * @param {} bucketId\n     * @return {} bucket\n     */\n    var _createBucket = function(buckets, bucketId) {\n        var bucket = buckets[bucketId] = [];\n        return bucket;\n    };\n\n    /**\n     * Adds a body to a bucket.\n     * @method _bucketAddBody\n     * @private\n     * @param {} grid\n     * @param {} bucket\n     * @param {} body\n     */\n    var _bucketAddBody = function(grid, bucket, body) {\n        // add new pairs\n        for (var i = 0; i < bucket.length; i++) {\n            var bodyB = bucket[i];\n\n            if (body.id === bodyB.id || (body.isStatic && bodyB.isStatic))\n                continue;\n\n            // keep track of the number of buckets the pair exists in\n            // important for Grid.update to work\n            var pairId = Pair.id(body, bodyB),\n                pair = grid.pairs[pairId];\n\n            if (pair) {\n                pair[2] += 1;\n            } else {\n                grid.pairs[pairId] = [body, bodyB, 1];\n            }\n        }\n\n        // add to bodies (after pairs, otherwise pairs with self)\n        bucket.push(body);\n    };\n\n    /**\n     * Removes a body from a bucket.\n     * @method _bucketRemoveBody\n     * @private\n     * @param {} grid\n     * @param {} bucket\n     * @param {} body\n     */\n    var _bucketRemoveBody = function(grid, bucket, body) {\n        // remove from bucket\n        bucket.splice(Common.indexOf(bucket, body), 1);\n\n        // update pair counts\n        for (var i = 0; i < bucket.length; i++) {\n            // keep track of the number of buckets the pair exists in\n            // important for _createActivePairsList to work\n            var bodyB = bucket[i],\n                pairId = Pair.id(body, bodyB),\n                pair = grid.pairs[pairId];\n\n            if (pair)\n                pair[2] -= 1;\n        }\n    };\n\n    /**\n     * Generates a list of the active pairs in the grid.\n     * @method _createActivePairsList\n     * @private\n     * @param {} grid\n     * @return [] pairs\n     */\n    var _createActivePairsList = function(grid) {\n        var pairKeys,\n            pair,\n            pairs = [];\n\n        // grid.pairs is used as a hashmap\n        pairKeys = Common.keys(grid.pairs);\n\n        // iterate over grid.pairs\n        for (var k = 0; k < pairKeys.length; k++) {\n            pair = grid.pairs[pairKeys[k]];\n\n            // if pair exists in at least one bucket\n            // it is a pair that needs further collision testing so push it\n            if (pair[2] > 0) {\n                pairs.push(pair);\n            } else {\n                delete grid.pairs[pairKeys[k]];\n            }\n        }\n\n        return pairs;\n    };\n    \n})();\n\n},{\"../core/Common\":14,\"./Detector\":5,\"./Pair\":7}],7:[function(_dereq_,module,exports){\n/**\n* The `Matter.Pair` module contains methods for creating and manipulating collision pairs.\n*\n* @class Pair\n*/\n\nvar Pair = {};\n\nmodule.exports = Pair;\n\nvar Contact = _dereq_('./Contact');\n\n(function() {\n    \n    /**\n     * Creates a pair.\n     * @method create\n     * @param {collision} collision\n     * @param {number} timestamp\n     * @return {pair} A new pair\n     */\n    Pair.create = function(collision, timestamp) {\n        var bodyA = collision.bodyA,\n            bodyB = collision.bodyB,\n            parentA = collision.parentA,\n            parentB = collision.parentB;\n\n        var pair = {\n            id: Pair.id(bodyA, bodyB),\n            bodyA: bodyA,\n            bodyB: bodyB,\n            contacts: {},\n            activeContacts: [],\n            separation: 0,\n            isActive: true,\n            isSensor: bodyA.isSensor || bodyB.isSensor,\n            timeCreated: timestamp,\n            timeUpdated: timestamp,\n            inverseMass: parentA.inverseMass + parentB.inverseMass,\n            friction: Math.min(parentA.friction, parentB.friction),\n            frictionStatic: Math.max(parentA.frictionStatic, parentB.frictionStatic),\n            restitution: Math.max(parentA.restitution, parentB.restitution),\n            slop: Math.max(parentA.slop, parentB.slop)\n        };\n\n        Pair.update(pair, collision, timestamp);\n\n        return pair;\n    };\n\n    /**\n     * Updates a pair given a collision.\n     * @method update\n     * @param {pair} pair\n     * @param {collision} collision\n     * @param {number} timestamp\n     */\n    Pair.update = function(pair, collision, timestamp) {\n        var contacts = pair.contacts,\n            supports = collision.supports,\n            activeContacts = pair.activeContacts,\n            parentA = collision.parentA,\n            parentB = collision.parentB;\n        \n        pair.collision = collision;\n        pair.inverseMass = parentA.inverseMass + parentB.inverseMass;\n        pair.friction = Math.min(parentA.friction, parentB.friction);\n        pair.frictionStatic = Math.max(parentA.frictionStatic, parentB.frictionStatic);\n        pair.restitution = Math.max(parentA.restitution, parentB.restitution);\n        pair.slop = Math.max(parentA.slop, parentB.slop);\n        activeContacts.length = 0;\n        \n        if (collision.collided) {\n            for (var i = 0; i < supports.length; i++) {\n                var support = supports[i],\n                    contactId = Contact.id(support),\n                    contact = contacts[contactId];\n\n                if (contact) {\n                    activeContacts.push(contact);\n                } else {\n                    activeContacts.push(contacts[contactId] = Contact.create(support));\n                }\n            }\n\n            pair.separation = collision.depth;\n            Pair.setActive(pair, true, timestamp);\n        } else {\n            if (pair.isActive === true)\n                Pair.setActive(pair, false, timestamp);\n        }\n    };\n    \n    /**\n     * Set a pair as active or inactive.\n     * @method setActive\n     * @param {pair} pair\n     * @param {bool} isActive\n     * @param {number} timestamp\n     */\n    Pair.setActive = function(pair, isActive, timestamp) {\n        if (isActive) {\n            pair.isActive = true;\n            pair.timeUpdated = timestamp;\n        } else {\n            pair.isActive = false;\n            pair.activeContacts.length = 0;\n        }\n    };\n\n    /**\n     * Get the id for the given pair.\n     * @method id\n     * @param {body} bodyA\n     * @param {body} bodyB\n     * @return {string} Unique pairId\n     */\n    Pair.id = function(bodyA, bodyB) {\n        if (bodyA.id < bodyB.id) {\n            return 'A' + bodyA.id + 'B' + bodyB.id;\n        } else {\n            return 'A' + bodyB.id + 'B' + bodyA.id;\n        }\n    };\n\n})();\n\n},{\"./Contact\":4}],8:[function(_dereq_,module,exports){\n/**\n* The `Matter.Pairs` module contains methods for creating and manipulating collision pair sets.\n*\n* @class Pairs\n*/\n\nvar Pairs = {};\n\nmodule.exports = Pairs;\n\nvar Pair = _dereq_('./Pair');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n    \n    var _pairMaxIdleLife = 1000;\n\n    /**\n     * Creates a new pairs structure.\n     * @method create\n     * @param {object} options\n     * @return {pairs} A new pairs structure\n     */\n    Pairs.create = function(options) {\n        return Common.extend({ \n            table: {},\n            list: [],\n            collisionStart: [],\n            collisionActive: [],\n            collisionEnd: []\n        }, options);\n    };\n\n    /**\n     * Updates pairs given a list of collisions.\n     * @method update\n     * @param {object} pairs\n     * @param {collision[]} collisions\n     * @param {number} timestamp\n     */\n    Pairs.update = function(pairs, collisions, timestamp) {\n        var pairsList = pairs.list,\n            pairsTable = pairs.table,\n            collisionStart = pairs.collisionStart,\n            collisionEnd = pairs.collisionEnd,\n            collisionActive = pairs.collisionActive,\n            activePairIds = [],\n            collision,\n            pairId,\n            pair,\n            i;\n\n        // clear collision state arrays, but maintain old reference\n        collisionStart.length = 0;\n        collisionEnd.length = 0;\n        collisionActive.length = 0;\n\n        for (i = 0; i < collisions.length; i++) {\n            collision = collisions[i];\n\n            if (collision.collided) {\n                pairId = Pair.id(collision.bodyA, collision.bodyB);\n                activePairIds.push(pairId);\n\n                pair = pairsTable[pairId];\n                \n                if (pair) {\n                    // pair already exists (but may or may not be active)\n                    if (pair.isActive) {\n                        // pair exists and is active\n                        collisionActive.push(pair);\n                    } else {\n                        // pair exists but was inactive, so a collision has just started again\n                        collisionStart.push(pair);\n                    }\n\n                    // update the pair\n                    Pair.update(pair, collision, timestamp);\n                } else {\n                    // pair did not exist, create a new pair\n                    pair = Pair.create(collision, timestamp);\n                    pairsTable[pairId] = pair;\n\n                    // push the new pair\n                    collisionStart.push(pair);\n                    pairsList.push(pair);\n                }\n            }\n        }\n\n        // deactivate previously active pairs that are now inactive\n        for (i = 0; i < pairsList.length; i++) {\n            pair = pairsList[i];\n            if (pair.isActive && Common.indexOf(activePairIds, pair.id) === -1) {\n                Pair.setActive(pair, false, timestamp);\n                collisionEnd.push(pair);\n            }\n        }\n    };\n    \n    /**\n     * Finds and removes pairs that have been inactive for a set amount of time.\n     * @method removeOld\n     * @param {object} pairs\n     * @param {number} timestamp\n     */\n    Pairs.removeOld = function(pairs, timestamp) {\n        var pairsList = pairs.list,\n            pairsTable = pairs.table,\n            indexesToRemove = [],\n            pair,\n            collision,\n            pairIndex,\n            i;\n\n        for (i = 0; i < pairsList.length; i++) {\n            pair = pairsList[i];\n            collision = pair.collision;\n            \n            // never remove sleeping pairs\n            if (collision.bodyA.isSleeping || collision.bodyB.isSleeping) {\n                pair.timeUpdated = timestamp;\n                continue;\n            }\n\n            // if pair is inactive for too long, mark it to be removed\n            if (timestamp - pair.timeUpdated > _pairMaxIdleLife) {\n                indexesToRemove.push(i);\n            }\n        }\n\n        // remove marked pairs\n        for (i = 0; i < indexesToRemove.length; i++) {\n            pairIndex = indexesToRemove[i] - i;\n            pair = pairsList[pairIndex];\n            delete pairsTable[pair.id];\n            pairsList.splice(pairIndex, 1);\n        }\n    };\n\n    /**\n     * Clears the given pairs structure.\n     * @method clear\n     * @param {pairs} pairs\n     * @return {pairs} pairs\n     */\n    Pairs.clear = function(pairs) {\n        pairs.table = {};\n        pairs.list.length = 0;\n        pairs.collisionStart.length = 0;\n        pairs.collisionActive.length = 0;\n        pairs.collisionEnd.length = 0;\n        return pairs;\n    };\n\n})();\n\n},{\"../core/Common\":14,\"./Pair\":7}],9:[function(_dereq_,module,exports){\n/**\n* The `Matter.Query` module contains methods for performing collision queries.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Query\n*/\n\nvar Query = {};\n\nmodule.exports = Query;\n\nvar Vector = _dereq_('../geometry/Vector');\nvar SAT = _dereq_('./SAT');\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Bodies = _dereq_('../factory/Bodies');\nvar Vertices = _dereq_('../geometry/Vertices');\n\n(function() {\n\n    /**\n     * Casts a ray segment against a set of bodies and returns all collisions, ray width is optional. Intersection points are not provided.\n     * @method ray\n     * @param {body[]} bodies\n     * @param {vector} startPoint\n     * @param {vector} endPoint\n     * @param {number} [rayWidth]\n     * @return {object[]} Collisions\n     */\n    Query.ray = function(bodies, startPoint, endPoint, rayWidth) {\n        rayWidth = rayWidth || 1e-100;\n\n        var rayAngle = Vector.angle(startPoint, endPoint),\n            rayLength = Vector.magnitude(Vector.sub(startPoint, endPoint)),\n            rayX = (endPoint.x + startPoint.x) * 0.5,\n            rayY = (endPoint.y + startPoint.y) * 0.5,\n            ray = Bodies.rectangle(rayX, rayY, rayLength, rayWidth, { angle: rayAngle }),\n            collisions = [];\n\n        for (var i = 0; i < bodies.length; i++) {\n            var bodyA = bodies[i];\n            \n            if (Bounds.overlaps(bodyA.bounds, ray.bounds)) {\n                for (var j = bodyA.parts.length === 1 ? 0 : 1; j < bodyA.parts.length; j++) {\n                    var part = bodyA.parts[j];\n\n                    if (Bounds.overlaps(part.bounds, ray.bounds)) {\n                        var collision = SAT.collides(part, ray);\n                        if (collision.collided) {\n                            collision.body = collision.bodyA = collision.bodyB = bodyA;\n                            collisions.push(collision);\n                            break;\n                        }\n                    }\n                }\n            }\n        }\n\n        return collisions;\n    };\n\n    /**\n     * Returns all bodies whose bounds are inside (or outside if set) the given set of bounds, from the given set of bodies.\n     * @method region\n     * @param {body[]} bodies\n     * @param {bounds} bounds\n     * @param {bool} [outside=false]\n     * @return {body[]} The bodies matching the query\n     */\n    Query.region = function(bodies, bounds, outside) {\n        var result = [];\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                overlaps = Bounds.overlaps(body.bounds, bounds);\n            if ((overlaps && !outside) || (!overlaps && outside))\n                result.push(body);\n        }\n\n        return result;\n    };\n\n    /**\n     * Returns all bodies whose vertices contain the given point, from the given set of bodies.\n     * @method point\n     * @param {body[]} bodies\n     * @param {vector} point\n     * @return {body[]} The bodies matching the query\n     */\n    Query.point = function(bodies, point) {\n        var result = [];\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n            \n            if (Bounds.contains(body.bounds, point)) {\n                for (var j = body.parts.length === 1 ? 0 : 1; j < body.parts.length; j++) {\n                    var part = body.parts[j];\n\n                    if (Bounds.contains(part.bounds, point)\n                        && Vertices.contains(part.vertices, point)) {\n                        result.push(body);\n                        break;\n                    }\n                }\n            }\n        }\n\n        return result;\n    };\n\n})();\n\n},{\"../factory/Bodies\":23,\"../geometry/Bounds\":26,\"../geometry/Vector\":28,\"../geometry/Vertices\":29,\"./SAT\":11}],10:[function(_dereq_,module,exports){\n/**\n* The `Matter.Resolver` module contains methods for resolving collision pairs.\n*\n* @class Resolver\n*/\n\nvar Resolver = {};\n\nmodule.exports = Resolver;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Vector = _dereq_('../geometry/Vector');\nvar Common = _dereq_('../core/Common');\nvar Bounds = _dereq_('../geometry/Bounds');\n\n(function() {\n\n    Resolver._restingThresh = 4;\n    Resolver._restingThreshTangent = 6;\n    Resolver._positionDampen = 0.9;\n    Resolver._positionWarming = 0.8;\n    Resolver._frictionNormalMultiplier = 5;\n\n    /**\n     * Prepare pairs for position solving.\n     * @method preSolvePosition\n     * @param {pair[]} pairs\n     */\n    Resolver.preSolvePosition = function(pairs) {\n        var i,\n            pair,\n            activeCount;\n\n        // find total contacts on each body\n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n            \n            if (!pair.isActive)\n                continue;\n            \n            activeCount = pair.activeContacts.length;\n            pair.collision.parentA.totalContacts += activeCount;\n            pair.collision.parentB.totalContacts += activeCount;\n        }\n    };\n\n    /**\n     * Find a solution for pair positions.\n     * @method solvePosition\n     * @param {pair[]} pairs\n     * @param {number} timeScale\n     */\n    Resolver.solvePosition = function(pairs, timeScale) {\n        var i,\n            pair,\n            collision,\n            bodyA,\n            bodyB,\n            normal,\n            bodyBtoA,\n            contactShare,\n            positionImpulse,\n            contactCount = {},\n            tempA = Vector._temp[0],\n            tempB = Vector._temp[1],\n            tempC = Vector._temp[2],\n            tempD = Vector._temp[3];\n\n        // find impulses required to resolve penetration\n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n            \n            if (!pair.isActive || pair.isSensor)\n                continue;\n\n            collision = pair.collision;\n            bodyA = collision.parentA;\n            bodyB = collision.parentB;\n            normal = collision.normal;\n\n            // get current separation between body edges involved in collision\n            bodyBtoA = Vector.sub(Vector.add(bodyB.positionImpulse, bodyB.position, tempA), \n                                    Vector.add(bodyA.positionImpulse, \n                                        Vector.sub(bodyB.position, collision.penetration, tempB), tempC), tempD);\n\n            pair.separation = Vector.dot(normal, bodyBtoA);\n        }\n        \n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n\n            if (!pair.isActive || pair.isSensor)\n                continue;\n            \n            collision = pair.collision;\n            bodyA = collision.parentA;\n            bodyB = collision.parentB;\n            normal = collision.normal;\n            positionImpulse = (pair.separation - pair.slop) * timeScale;\n\n            if (bodyA.isStatic || bodyB.isStatic)\n                positionImpulse *= 2;\n            \n            if (!(bodyA.isStatic || bodyA.isSleeping)) {\n                contactShare = Resolver._positionDampen / bodyA.totalContacts;\n                bodyA.positionImpulse.x += normal.x * positionImpulse * contactShare;\n                bodyA.positionImpulse.y += normal.y * positionImpulse * contactShare;\n            }\n\n            if (!(bodyB.isStatic || bodyB.isSleeping)) {\n                contactShare = Resolver._positionDampen / bodyB.totalContacts;\n                bodyB.positionImpulse.x -= normal.x * positionImpulse * contactShare;\n                bodyB.positionImpulse.y -= normal.y * positionImpulse * contactShare;\n            }\n        }\n    };\n\n    /**\n     * Apply position resolution.\n     * @method postSolvePosition\n     * @param {body[]} bodies\n     */\n    Resolver.postSolvePosition = function(bodies) {\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            // reset contact count\n            body.totalContacts = 0;\n\n            if (body.positionImpulse.x !== 0 || body.positionImpulse.y !== 0) {\n                // update body geometry\n                for (var j = 0; j < body.parts.length; j++) {\n                    var part = body.parts[j];\n                    Vertices.translate(part.vertices, body.positionImpulse);\n                    Bounds.update(part.bounds, part.vertices, body.velocity);\n                    part.position.x += body.positionImpulse.x;\n                    part.position.y += body.positionImpulse.y;\n                }\n\n                // move the body without changing velocity\n                body.positionPrev.x += body.positionImpulse.x;\n                body.positionPrev.y += body.positionImpulse.y;\n\n                if (Vector.dot(body.positionImpulse, body.velocity) < 0) {\n                    // reset cached impulse if the body has velocity along it\n                    body.positionImpulse.x = 0;\n                    body.positionImpulse.y = 0;\n                } else {\n                    // warm the next iteration\n                    body.positionImpulse.x *= Resolver._positionWarming;\n                    body.positionImpulse.y *= Resolver._positionWarming;\n                }\n            }\n        }\n    };\n\n    /**\n     * Prepare pairs for velocity solving.\n     * @method preSolveVelocity\n     * @param {pair[]} pairs\n     */\n    Resolver.preSolveVelocity = function(pairs) {\n        var i,\n            j,\n            pair,\n            contacts,\n            collision,\n            bodyA,\n            bodyB,\n            normal,\n            tangent,\n            contact,\n            contactVertex,\n            normalImpulse,\n            tangentImpulse,\n            offset,\n            impulse = Vector._temp[0],\n            tempA = Vector._temp[1];\n        \n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n            \n            if (!pair.isActive || pair.isSensor)\n                continue;\n            \n            contacts = pair.activeContacts;\n            collision = pair.collision;\n            bodyA = collision.parentA;\n            bodyB = collision.parentB;\n            normal = collision.normal;\n            tangent = collision.tangent;\n\n            // resolve each contact\n            for (j = 0; j < contacts.length; j++) {\n                contact = contacts[j];\n                contactVertex = contact.vertex;\n                normalImpulse = contact.normalImpulse;\n                tangentImpulse = contact.tangentImpulse;\n\n                if (normalImpulse !== 0 || tangentImpulse !== 0) {\n                    // total impulse from contact\n                    impulse.x = (normal.x * normalImpulse) + (tangent.x * tangentImpulse);\n                    impulse.y = (normal.y * normalImpulse) + (tangent.y * tangentImpulse);\n                    \n                    // apply impulse from contact\n                    if (!(bodyA.isStatic || bodyA.isSleeping)) {\n                        offset = Vector.sub(contactVertex, bodyA.position, tempA);\n                        bodyA.positionPrev.x += impulse.x * bodyA.inverseMass;\n                        bodyA.positionPrev.y += impulse.y * bodyA.inverseMass;\n                        bodyA.anglePrev += Vector.cross(offset, impulse) * bodyA.inverseInertia;\n                    }\n\n                    if (!(bodyB.isStatic || bodyB.isSleeping)) {\n                        offset = Vector.sub(contactVertex, bodyB.position, tempA);\n                        bodyB.positionPrev.x -= impulse.x * bodyB.inverseMass;\n                        bodyB.positionPrev.y -= impulse.y * bodyB.inverseMass;\n                        bodyB.anglePrev -= Vector.cross(offset, impulse) * bodyB.inverseInertia;\n                    }\n                }\n            }\n        }\n    };\n\n    /**\n     * Find a solution for pair velocities.\n     * @method solveVelocity\n     * @param {pair[]} pairs\n     * @param {number} timeScale\n     */\n    Resolver.solveVelocity = function(pairs, timeScale) {\n        var timeScaleSquared = timeScale * timeScale,\n            impulse = Vector._temp[0],\n            tempA = Vector._temp[1],\n            tempB = Vector._temp[2],\n            tempC = Vector._temp[3],\n            tempD = Vector._temp[4],\n            tempE = Vector._temp[5];\n        \n        for (var i = 0; i < pairs.length; i++) {\n            var pair = pairs[i];\n            \n            if (!pair.isActive || pair.isSensor)\n                continue;\n            \n            var collision = pair.collision,\n                bodyA = collision.parentA,\n                bodyB = collision.parentB,\n                normal = collision.normal,\n                tangent = collision.tangent,\n                contacts = pair.activeContacts,\n                contactShare = 1 / contacts.length;\n\n            // update body velocities\n            bodyA.velocity.x = bodyA.position.x - bodyA.positionPrev.x;\n            bodyA.velocity.y = bodyA.position.y - bodyA.positionPrev.y;\n            bodyB.velocity.x = bodyB.position.x - bodyB.positionPrev.x;\n            bodyB.velocity.y = bodyB.position.y - bodyB.positionPrev.y;\n            bodyA.angularVelocity = bodyA.angle - bodyA.anglePrev;\n            bodyB.angularVelocity = bodyB.angle - bodyB.anglePrev;\n\n            // resolve each contact\n            for (var j = 0; j < contacts.length; j++) {\n                var contact = contacts[j],\n                    contactVertex = contact.vertex,\n                    offsetA = Vector.sub(contactVertex, bodyA.position, tempA),\n                    offsetB = Vector.sub(contactVertex, bodyB.position, tempB),\n                    velocityPointA = Vector.add(bodyA.velocity, Vector.mult(Vector.perp(offsetA), bodyA.angularVelocity), tempC),\n                    velocityPointB = Vector.add(bodyB.velocity, Vector.mult(Vector.perp(offsetB), bodyB.angularVelocity), tempD), \n                    relativeVelocity = Vector.sub(velocityPointA, velocityPointB, tempE),\n                    normalVelocity = Vector.dot(normal, relativeVelocity);\n\n                var tangentVelocity = Vector.dot(tangent, relativeVelocity),\n                    tangentSpeed = Math.abs(tangentVelocity),\n                    tangentVelocityDirection = Common.sign(tangentVelocity);\n\n                // raw impulses\n                var normalImpulse = (1 + pair.restitution) * normalVelocity,\n                    normalForce = Common.clamp(pair.separation + normalVelocity, 0, 1) * Resolver._frictionNormalMultiplier;\n\n                // coulomb friction\n                var tangentImpulse = tangentVelocity,\n                    maxFriction = Infinity;\n\n                if (tangentSpeed > pair.friction * pair.frictionStatic * normalForce * timeScaleSquared) {\n                    maxFriction = tangentSpeed;\n                    tangentImpulse = Common.clamp(\n                        pair.friction * tangentVelocityDirection * timeScaleSquared,\n                        -maxFriction, maxFriction\n                    );\n                }\n\n                // modify impulses accounting for mass, inertia and offset\n                var oAcN = Vector.cross(offsetA, normal),\n                    oBcN = Vector.cross(offsetB, normal),\n                    share = contactShare / (bodyA.inverseMass + bodyB.inverseMass + bodyA.inverseInertia * oAcN * oAcN  + bodyB.inverseInertia * oBcN * oBcN);\n\n                normalImpulse *= share;\n                tangentImpulse *= share;\n\n                // handle high velocity and resting collisions separately\n                if (normalVelocity < 0 && normalVelocity * normalVelocity > Resolver._restingThresh * timeScaleSquared) {\n                    // high normal velocity so clear cached contact normal impulse\n                    contact.normalImpulse = 0;\n                } else {\n                    // solve resting collision constraints using Erin Catto's method (GDC08)\n                    // impulse constraint tends to 0\n                    var contactNormalImpulse = contact.normalImpulse;\n                    contact.normalImpulse = Math.min(contact.normalImpulse + normalImpulse, 0);\n                    normalImpulse = contact.normalImpulse - contactNormalImpulse;\n                }\n\n                // handle high velocity and resting collisions separately\n                if (tangentVelocity * tangentVelocity > Resolver._restingThreshTangent * timeScaleSquared) {\n                    // high tangent velocity so clear cached contact tangent impulse\n                    contact.tangentImpulse = 0;\n                } else {\n                    // solve resting collision constraints using Erin Catto's method (GDC08)\n                    // tangent impulse tends to -tangentSpeed or +tangentSpeed\n                    var contactTangentImpulse = contact.tangentImpulse;\n                    contact.tangentImpulse = Common.clamp(contact.tangentImpulse + tangentImpulse, -maxFriction, maxFriction);\n                    tangentImpulse = contact.tangentImpulse - contactTangentImpulse;\n                }\n\n                // total impulse from contact\n                impulse.x = (normal.x * normalImpulse) + (tangent.x * tangentImpulse);\n                impulse.y = (normal.y * normalImpulse) + (tangent.y * tangentImpulse);\n                \n                // apply impulse from contact\n                if (!(bodyA.isStatic || bodyA.isSleeping)) {\n                    bodyA.positionPrev.x += impulse.x * bodyA.inverseMass;\n                    bodyA.positionPrev.y += impulse.y * bodyA.inverseMass;\n                    bodyA.anglePrev += Vector.cross(offsetA, impulse) * bodyA.inverseInertia;\n                }\n\n                if (!(bodyB.isStatic || bodyB.isSleeping)) {\n                    bodyB.positionPrev.x -= impulse.x * bodyB.inverseMass;\n                    bodyB.positionPrev.y -= impulse.y * bodyB.inverseMass;\n                    bodyB.anglePrev -= Vector.cross(offsetB, impulse) * bodyB.inverseInertia;\n                }\n            }\n        }\n    };\n\n})();\n\n},{\"../core/Common\":14,\"../geometry/Bounds\":26,\"../geometry/Vector\":28,\"../geometry/Vertices\":29}],11:[function(_dereq_,module,exports){\n/**\n* The `Matter.SAT` module contains methods for detecting collisions using the Separating Axis Theorem.\n*\n* @class SAT\n*/\n\n// TODO: true circles and curves\n\nvar SAT = {};\n\nmodule.exports = SAT;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Vector = _dereq_('../geometry/Vector');\n\n(function() {\n\n    /**\n     * Detect collision between two bodies using the Separating Axis Theorem.\n     * @method collides\n     * @param {body} bodyA\n     * @param {body} bodyB\n     * @param {collision} previousCollision\n     * @return {collision} collision\n     */\n    SAT.collides = function(bodyA, bodyB, previousCollision) {\n        var overlapAB,\n            overlapBA, \n            minOverlap,\n            collision,\n            canReusePrevCol = false;\n\n        if (previousCollision) {\n            // estimate total motion\n            var parentA = bodyA.parent,\n                parentB = bodyB.parent,\n                motion = parentA.speed * parentA.speed + parentA.angularSpeed * parentA.angularSpeed\n                       + parentB.speed * parentB.speed + parentB.angularSpeed * parentB.angularSpeed;\n\n            // we may be able to (partially) reuse collision result \n            // but only safe if collision was resting\n            canReusePrevCol = previousCollision && previousCollision.collided && motion < 0.2;\n\n            // reuse collision object\n            collision = previousCollision;\n        } else {\n            collision = { collided: false, bodyA: bodyA, bodyB: bodyB };\n        }\n\n        if (previousCollision && canReusePrevCol) {\n            // if we can reuse the collision result\n            // we only need to test the previously found axis\n            var axisBodyA = collision.axisBody,\n                axisBodyB = axisBodyA === bodyA ? bodyB : bodyA,\n                axes = [axisBodyA.axes[previousCollision.axisNumber]];\n\n            minOverlap = _overlapAxes(axisBodyA.vertices, axisBodyB.vertices, axes);\n            collision.reused = true;\n\n            if (minOverlap.overlap <= 0) {\n                collision.collided = false;\n                return collision;\n            }\n        } else {\n            // if we can't reuse a result, perform a full SAT test\n\n            overlapAB = _overlapAxes(bodyA.vertices, bodyB.vertices, bodyA.axes);\n\n            if (overlapAB.overlap <= 0) {\n                collision.collided = false;\n                return collision;\n            }\n\n            overlapBA = _overlapAxes(bodyB.vertices, bodyA.vertices, bodyB.axes);\n\n            if (overlapBA.overlap <= 0) {\n                collision.collided = false;\n                return collision;\n            }\n\n            if (overlapAB.overlap < overlapBA.overlap) {\n                minOverlap = overlapAB;\n                collision.axisBody = bodyA;\n            } else {\n                minOverlap = overlapBA;\n                collision.axisBody = bodyB;\n            }\n\n            // important for reuse later\n            collision.axisNumber = minOverlap.axisNumber;\n        }\n\n        collision.bodyA = bodyA.id < bodyB.id ? bodyA : bodyB;\n        collision.bodyB = bodyA.id < bodyB.id ? bodyB : bodyA;\n        collision.collided = true;\n        collision.depth = minOverlap.overlap;\n        collision.parentA = collision.bodyA.parent;\n        collision.parentB = collision.bodyB.parent;\n        \n        bodyA = collision.bodyA;\n        bodyB = collision.bodyB;\n\n        // ensure normal is facing away from bodyA\n        if (Vector.dot(minOverlap.axis, Vector.sub(bodyB.position, bodyA.position)) < 0) {\n            collision.normal = {\n                x: minOverlap.axis.x,\n                y: minOverlap.axis.y\n            };\n        } else {\n            collision.normal = {\n                x: -minOverlap.axis.x,\n                y: -minOverlap.axis.y\n            };\n        }\n\n        collision.tangent = Vector.perp(collision.normal);\n\n        collision.penetration = collision.penetration || {};\n        collision.penetration.x = collision.normal.x * collision.depth;\n        collision.penetration.y = collision.normal.y * collision.depth; \n\n        // find support points, there is always either exactly one or two\n        var verticesB = _findSupports(bodyA, bodyB, collision.normal),\n            supports = [];\n\n        // find the supports from bodyB that are inside bodyA\n        if (Vertices.contains(bodyA.vertices, verticesB[0]))\n            supports.push(verticesB[0]);\n\n        if (Vertices.contains(bodyA.vertices, verticesB[1]))\n            supports.push(verticesB[1]);\n\n        // find the supports from bodyA that are inside bodyB\n        if (supports.length < 2) {\n            var verticesA = _findSupports(bodyB, bodyA, Vector.neg(collision.normal));\n                \n            if (Vertices.contains(bodyB.vertices, verticesA[0]))\n                supports.push(verticesA[0]);\n\n            if (supports.length < 2 && Vertices.contains(bodyB.vertices, verticesA[1]))\n                supports.push(verticesA[1]);\n        }\n\n        // account for the edge case of overlapping but no vertex containment\n        if (supports.length < 1)\n            supports = [verticesB[0]];\n        \n        collision.supports = supports;\n\n        return collision;\n    };\n\n    /**\n     * Find the overlap between two sets of vertices.\n     * @method _overlapAxes\n     * @private\n     * @param {} verticesA\n     * @param {} verticesB\n     * @param {} axes\n     * @return result\n     */\n    var _overlapAxes = function(verticesA, verticesB, axes) {\n        var projectionA = Vector._temp[0], \n            projectionB = Vector._temp[1],\n            result = { overlap: Number.MAX_VALUE },\n            overlap,\n            axis;\n\n        for (var i = 0; i < axes.length; i++) {\n            axis = axes[i];\n\n            _projectToAxis(projectionA, verticesA, axis);\n            _projectToAxis(projectionB, verticesB, axis);\n\n            overlap = Math.min(projectionA.max - projectionB.min, projectionB.max - projectionA.min);\n\n            if (overlap <= 0) {\n                result.overlap = overlap;\n                return result;\n            }\n\n            if (overlap < result.overlap) {\n                result.overlap = overlap;\n                result.axis = axis;\n                result.axisNumber = i;\n            }\n        }\n\n        return result;\n    };\n\n    /**\n     * Projects vertices on an axis and returns an interval.\n     * @method _projectToAxis\n     * @private\n     * @param {} projection\n     * @param {} vertices\n     * @param {} axis\n     */\n    var _projectToAxis = function(projection, vertices, axis) {\n        var min = Vector.dot(vertices[0], axis),\n            max = min;\n\n        for (var i = 1; i < vertices.length; i += 1) {\n            var dot = Vector.dot(vertices[i], axis);\n\n            if (dot > max) { \n                max = dot; \n            } else if (dot < min) { \n                min = dot; \n            }\n        }\n\n        projection.min = min;\n        projection.max = max;\n    };\n    \n    /**\n     * Finds supporting vertices given two bodies along a given direction using hill-climbing.\n     * @method _findSupports\n     * @private\n     * @param {} bodyA\n     * @param {} bodyB\n     * @param {} normal\n     * @return [vector]\n     */\n    var _findSupports = function(bodyA, bodyB, normal) {\n        var nearestDistance = Number.MAX_VALUE,\n            vertexToBody = Vector._temp[0],\n            vertices = bodyB.vertices,\n            bodyAPosition = bodyA.position,\n            distance,\n            vertex,\n            vertexA,\n            vertexB;\n\n        // find closest vertex on bodyB\n        for (var i = 0; i < vertices.length; i++) {\n            vertex = vertices[i];\n            vertexToBody.x = vertex.x - bodyAPosition.x;\n            vertexToBody.y = vertex.y - bodyAPosition.y;\n            distance = -Vector.dot(normal, vertexToBody);\n\n            if (distance < nearestDistance) {\n                nearestDistance = distance;\n                vertexA = vertex;\n            }\n        }\n\n        // find next closest vertex using the two connected to it\n        var prevIndex = vertexA.index - 1 >= 0 ? vertexA.index - 1 : vertices.length - 1;\n        vertex = vertices[prevIndex];\n        vertexToBody.x = vertex.x - bodyAPosition.x;\n        vertexToBody.y = vertex.y - bodyAPosition.y;\n        nearestDistance = -Vector.dot(normal, vertexToBody);\n        vertexB = vertex;\n\n        var nextIndex = (vertexA.index + 1) % vertices.length;\n        vertex = vertices[nextIndex];\n        vertexToBody.x = vertex.x - bodyAPosition.x;\n        vertexToBody.y = vertex.y - bodyAPosition.y;\n        distance = -Vector.dot(normal, vertexToBody);\n        if (distance < nearestDistance) {\n            vertexB = vertex;\n        }\n\n        return [vertexA, vertexB];\n    };\n\n})();\n\n},{\"../geometry/Vector\":28,\"../geometry/Vertices\":29}],12:[function(_dereq_,module,exports){\n/**\n* The `Matter.Constraint` module contains methods for creating and manipulating constraints.\n* Constraints are used for specifying that a fixed distance must be maintained between two bodies (or a body and a fixed world-space position).\n* The stiffness of constraints can be modified to create springs or elastic.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Constraint\n*/\n\nvar Constraint = {};\n\nmodule.exports = Constraint;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Vector = _dereq_('../geometry/Vector');\nvar Sleeping = _dereq_('../core/Sleeping');\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Axes = _dereq_('../geometry/Axes');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    Constraint._warming = 0.4;\n    Constraint._torqueDampen = 1;\n    Constraint._minLength = 0.000001;\n\n    /**\n     * Creates a new constraint.\n     * All properties have default values, and many are pre-calculated automatically based on other properties.\n     * To simulate a revolute constraint (or pin joint) set `length: 0` and a high `stiffness` value (e.g. `0.7` or above).\n     * If the constraint is unstable, try lowering the `stiffness` value and / or increasing `engine.constraintIterations`.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {} options\n     * @return {constraint} constraint\n     */\n    Constraint.create = function(options) {\n        var constraint = options;\n\n        // if bodies defined but no points, use body centre\n        if (constraint.bodyA && !constraint.pointA)\n            constraint.pointA = { x: 0, y: 0 };\n        if (constraint.bodyB && !constraint.pointB)\n            constraint.pointB = { x: 0, y: 0 };\n\n        // calculate static length using initial world space points\n        var initialPointA = constraint.bodyA ? Vector.add(constraint.bodyA.position, constraint.pointA) : constraint.pointA,\n            initialPointB = constraint.bodyB ? Vector.add(constraint.bodyB.position, constraint.pointB) : constraint.pointB,\n            length = Vector.magnitude(Vector.sub(initialPointA, initialPointB));\n    \n        constraint.length = typeof constraint.length !== 'undefined' ? constraint.length : length;\n\n        // option defaults\n        constraint.id = constraint.id || Common.nextId();\n        constraint.label = constraint.label || 'Constraint';\n        constraint.type = 'constraint';\n        constraint.stiffness = constraint.stiffness || (constraint.length > 0 ? 1 : 0.7);\n        constraint.damping = constraint.damping || 0;\n        constraint.angularStiffness = constraint.angularStiffness || 0;\n        constraint.angleA = constraint.bodyA ? constraint.bodyA.angle : constraint.angleA;\n        constraint.angleB = constraint.bodyB ? constraint.bodyB.angle : constraint.angleB;\n        constraint.plugin = {};\n\n        // render\n        var render = {\n            visible: true,\n            lineWidth: 2,\n            strokeStyle: '#ffffff',\n            type: 'line',\n            anchors: true\n        };\n\n        if (constraint.length === 0 && constraint.stiffness > 0.1) {\n            render.type = 'pin';\n            render.anchors = false;\n        } else if (constraint.stiffness < 0.9) {\n            render.type = 'spring';\n        }\n\n        constraint.render = Common.extend(render, constraint.render);\n\n        return constraint;\n    };\n\n    /**\n     * Prepares for solving by constraint warming.\n     * @private\n     * @method preSolveAll\n     * @param {body[]} bodies\n     */\n    Constraint.preSolveAll = function(bodies) {\n        for (var i = 0; i < bodies.length; i += 1) {\n            var body = bodies[i],\n                impulse = body.constraintImpulse;\n\n            if (body.isStatic || (impulse.x === 0 && impulse.y === 0 && impulse.angle === 0)) {\n                continue;\n            }\n\n            body.position.x += impulse.x;\n            body.position.y += impulse.y;\n            body.angle += impulse.angle;\n        }\n    };\n\n    /**\n     * Solves all constraints in a list of collisions.\n     * @private\n     * @method solveAll\n     * @param {constraint[]} constraints\n     * @param {number} timeScale\n     */\n    Constraint.solveAll = function(constraints, timeScale) {\n        // Solve fixed constraints first.\n        for (var i = 0; i < constraints.length; i += 1) {\n            var constraint = constraints[i],\n                fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic),\n                fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);\n\n            if (fixedA || fixedB) {\n                Constraint.solve(constraints[i], timeScale);\n            }\n        }\n\n        // Solve free constraints last.\n        for (i = 0; i < constraints.length; i += 1) {\n            constraint = constraints[i];\n            fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic);\n            fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);\n\n            if (!fixedA && !fixedB) {\n                Constraint.solve(constraints[i], timeScale);\n            }\n        }\n    };\n\n    /**\n     * Solves a distance constraint with Gauss-Siedel method.\n     * @private\n     * @method solve\n     * @param {constraint} constraint\n     * @param {number} timeScale\n     */\n    Constraint.solve = function(constraint, timeScale) {\n        var bodyA = constraint.bodyA,\n            bodyB = constraint.bodyB,\n            pointA = constraint.pointA,\n            pointB = constraint.pointB;\n\n        if (!bodyA && !bodyB)\n            return;\n\n        // update reference angle\n        if (bodyA && !bodyA.isStatic) {\n            Vector.rotate(pointA, bodyA.angle - constraint.angleA, pointA);\n            constraint.angleA = bodyA.angle;\n        }\n        \n        // update reference angle\n        if (bodyB && !bodyB.isStatic) {\n            Vector.rotate(pointB, bodyB.angle - constraint.angleB, pointB);\n            constraint.angleB = bodyB.angle;\n        }\n\n        var pointAWorld = pointA,\n            pointBWorld = pointB;\n\n        if (bodyA) pointAWorld = Vector.add(bodyA.position, pointA);\n        if (bodyB) pointBWorld = Vector.add(bodyB.position, pointB);\n\n        if (!pointAWorld || !pointBWorld)\n            return;\n\n        var delta = Vector.sub(pointAWorld, pointBWorld),\n            currentLength = Vector.magnitude(delta);\n\n        // prevent singularity\n        if (currentLength < Constraint._minLength) {\n            currentLength = Constraint._minLength;\n        }\n\n        // solve distance constraint with Gauss-Siedel method\n        var difference = (currentLength - constraint.length) / currentLength,\n            stiffness = constraint.stiffness < 1 ? constraint.stiffness * timeScale : constraint.stiffness,\n            force = Vector.mult(delta, difference * stiffness),\n            massTotal = (bodyA ? bodyA.inverseMass : 0) + (bodyB ? bodyB.inverseMass : 0),\n            inertiaTotal = (bodyA ? bodyA.inverseInertia : 0) + (bodyB ? bodyB.inverseInertia : 0),\n            resistanceTotal = massTotal + inertiaTotal,\n            torque,\n            share,\n            normal,\n            normalVelocity,\n            relativeVelocity;\n\n        if (constraint.damping) {\n            var zero = Vector.create();\n            normal = Vector.div(delta, currentLength);\n\n            relativeVelocity = Vector.sub(\n                bodyB && Vector.sub(bodyB.position, bodyB.positionPrev) || zero,\n                bodyA && Vector.sub(bodyA.position, bodyA.positionPrev) || zero\n            );\n\n            normalVelocity = Vector.dot(normal, relativeVelocity);\n        }\n\n        if (bodyA && !bodyA.isStatic) {\n            share = bodyA.inverseMass / massTotal;\n\n            // keep track of applied impulses for post solving\n            bodyA.constraintImpulse.x -= force.x * share;\n            bodyA.constraintImpulse.y -= force.y * share;\n\n            // apply forces\n            bodyA.position.x -= force.x * share;\n            bodyA.position.y -= force.y * share;\n\n            // apply damping\n            if (constraint.damping) {\n                bodyA.positionPrev.x -= constraint.damping * normal.x * normalVelocity * share;\n                bodyA.positionPrev.y -= constraint.damping * normal.y * normalVelocity * share;\n            }\n\n            // apply torque\n            torque = (Vector.cross(pointA, force) / resistanceTotal) * Constraint._torqueDampen * bodyA.inverseInertia * (1 - constraint.angularStiffness);\n            bodyA.constraintImpulse.angle -= torque;\n            bodyA.angle -= torque;\n        }\n\n        if (bodyB && !bodyB.isStatic) {\n            share = bodyB.inverseMass / massTotal;\n\n            // keep track of applied impulses for post solving\n            bodyB.constraintImpulse.x += force.x * share;\n            bodyB.constraintImpulse.y += force.y * share;\n            \n            // apply forces\n            bodyB.position.x += force.x * share;\n            bodyB.position.y += force.y * share;\n\n            // apply damping\n            if (constraint.damping) {\n                bodyB.positionPrev.x += constraint.damping * normal.x * normalVelocity * share;\n                bodyB.positionPrev.y += constraint.damping * normal.y * normalVelocity * share;\n            }\n\n            // apply torque\n            torque = (Vector.cross(pointB, force) / resistanceTotal) * Constraint._torqueDampen * bodyB.inverseInertia * (1 - constraint.angularStiffness);\n            bodyB.constraintImpulse.angle += torque;\n            bodyB.angle += torque;\n        }\n\n    };\n\n    /**\n     * Performs body updates required after solving constraints.\n     * @private\n     * @method postSolveAll\n     * @param {body[]} bodies\n     */\n    Constraint.postSolveAll = function(bodies) {\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                impulse = body.constraintImpulse;\n\n            if (body.isStatic || (impulse.x === 0 && impulse.y === 0 && impulse.angle === 0)) {\n                continue;\n            }\n\n            Sleeping.set(body, false);\n\n            // update geometry and reset\n            for (var j = 0; j < body.parts.length; j++) {\n                var part = body.parts[j];\n                \n                Vertices.translate(part.vertices, impulse);\n\n                if (j > 0) {\n                    part.position.x += impulse.x;\n                    part.position.y += impulse.y;\n                }\n\n                if (impulse.angle !== 0) {\n                    Vertices.rotate(part.vertices, impulse.angle, body.position);\n                    Axes.rotate(part.axes, impulse.angle);\n                    if (j > 0) {\n                        Vector.rotateAbout(part.position, impulse.angle, body.position, part.position);\n                    }\n                }\n\n                Bounds.update(part.bounds, part.vertices, body.velocity);\n            }\n\n            // dampen the cached impulse for warming next step\n            impulse.angle *= Constraint._warming;\n            impulse.x *= Constraint._warming;\n            impulse.y *= Constraint._warming;\n        }\n    };\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * An integer `Number` uniquely identifying number generated in `Composite.create` by `Common.nextId`.\n     *\n     * @property id\n     * @type number\n     */\n\n    /**\n     * A `String` denoting the type of object.\n     *\n     * @property type\n     * @type string\n     * @default \"constraint\"\n     * @readOnly\n     */\n\n    /**\n     * An arbitrary `String` name to help the user identify and manage bodies.\n     *\n     * @property label\n     * @type string\n     * @default \"Constraint\"\n     */\n\n    /**\n     * An `Object` that defines the rendering properties to be consumed by the module `Matter.Render`.\n     *\n     * @property render\n     * @type object\n     */\n\n    /**\n     * A flag that indicates if the constraint should be rendered.\n     *\n     * @property render.visible\n     * @type boolean\n     * @default true\n     */\n\n    /**\n     * A `Number` that defines the line width to use when rendering the constraint outline.\n     * A value of `0` means no outline will be rendered.\n     *\n     * @property render.lineWidth\n     * @type number\n     * @default 2\n     */\n\n    /**\n     * A `String` that defines the stroke style to use when rendering the constraint outline.\n     * It is the same as when using a canvas, so it accepts CSS style property values.\n     *\n     * @property render.strokeStyle\n     * @type string\n     * @default a random colour\n     */\n\n    /**\n     * A `String` that defines the constraint rendering type. \n     * The possible values are 'line', 'pin', 'spring'.\n     * An appropriate render type will be automatically chosen unless one is given in options.\n     *\n     * @property render.type\n     * @type string\n     * @default 'line'\n     */\n\n    /**\n     * A `Boolean` that defines if the constraint's anchor points should be rendered.\n     *\n     * @property render.anchors\n     * @type boolean\n     * @default true\n     */\n\n    /**\n     * The first possible `Body` that this constraint is attached to.\n     *\n     * @property bodyA\n     * @type body\n     * @default null\n     */\n\n    /**\n     * The second possible `Body` that this constraint is attached to.\n     *\n     * @property bodyB\n     * @type body\n     * @default null\n     */\n\n    /**\n     * A `Vector` that specifies the offset of the constraint from center of the `constraint.bodyA` if defined, otherwise a world-space position.\n     *\n     * @property pointA\n     * @type vector\n     * @default { x: 0, y: 0 }\n     */\n\n    /**\n     * A `Vector` that specifies the offset of the constraint from center of the `constraint.bodyA` if defined, otherwise a world-space position.\n     *\n     * @property pointB\n     * @type vector\n     * @default { x: 0, y: 0 }\n     */\n\n    /**\n     * A `Number` that specifies the stiffness of the constraint, i.e. the rate at which it returns to its resting `constraint.length`.\n     * A value of `1` means the constraint should be very stiff.\n     * A value of `0.2` means the constraint acts like a soft spring.\n     *\n     * @property stiffness\n     * @type number\n     * @default 1\n     */\n\n    /**\n     * A `Number` that specifies the damping of the constraint, \n     * i.e. the amount of resistance applied to each body based on their velocities to limit the amount of oscillation.\n     * Damping will only be apparent when the constraint also has a very low `stiffness`.\n     * A value of `0.1` means the constraint will apply heavy damping, resulting in little to no oscillation.\n     * A value of `0` means the constraint will apply no damping.\n     *\n     * @property damping\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * A `Number` that specifies the target resting length of the constraint. \n     * It is calculated automatically in `Constraint.create` from initial positions of the `constraint.bodyA` and `constraint.bodyB`.\n     *\n     * @property length\n     * @type number\n     */\n\n    /**\n     * An object reserved for storing plugin-specific properties.\n     *\n     * @property plugin\n     * @type {}\n     */\n\n})();\n\n},{\"../core/Common\":14,\"../core/Sleeping\":22,\"../geometry/Axes\":25,\"../geometry/Bounds\":26,\"../geometry/Vector\":28,\"../geometry/Vertices\":29}],13:[function(_dereq_,module,exports){\n/**\n* The `Matter.MouseConstraint` module contains methods for creating mouse constraints.\n* Mouse constraints are used for allowing user interaction, providing the ability to move bodies via the mouse or touch.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class MouseConstraint\n*/\n\nvar MouseConstraint = {};\n\nmodule.exports = MouseConstraint;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Sleeping = _dereq_('../core/Sleeping');\nvar Mouse = _dereq_('../core/Mouse');\nvar Events = _dereq_('../core/Events');\nvar Detector = _dereq_('../collision/Detector');\nvar Constraint = _dereq_('./Constraint');\nvar Composite = _dereq_('../body/Composite');\nvar Common = _dereq_('../core/Common');\nvar Bounds = _dereq_('../geometry/Bounds');\n\n(function() {\n\n    /**\n     * Creates a new mouse constraint.\n     * All properties have default values, and many are pre-calculated automatically based on other properties.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {engine} engine\n     * @param {} options\n     * @return {MouseConstraint} A new MouseConstraint\n     */\n    MouseConstraint.create = function(engine, options) {\n        var mouse = (engine ? engine.mouse : null) || (options ? options.mouse : null);\n\n        if (!mouse) {\n            if (engine && engine.render && engine.render.canvas) {\n                mouse = Mouse.create(engine.render.canvas);\n            } else if (options && options.element) {\n                mouse = Mouse.create(options.element);\n            } else {\n                mouse = Mouse.create();\n                Common.warn('MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected');\n            }\n        }\n\n        var constraint = Constraint.create({ \n            label: 'Mouse Constraint',\n            pointA: mouse.position,\n            pointB: { x: 0, y: 0 },\n            length: 0.01, \n            stiffness: 0.1,\n            angularStiffness: 1,\n            render: {\n                strokeStyle: '#90EE90',\n                lineWidth: 3\n            }\n        });\n\n        var defaults = {\n            type: 'mouseConstraint',\n            mouse: mouse,\n            element: null,\n            body: null,\n            constraint: constraint,\n            collisionFilter: {\n                category: 0x0001,\n                mask: 0xFFFFFFFF,\n                group: 0\n            }\n        };\n\n        var mouseConstraint = Common.extend(defaults, options);\n\n        Events.on(engine, 'beforeUpdate', function() {\n            var allBodies = Composite.allBodies(engine.world);\n            MouseConstraint.update(mouseConstraint, allBodies);\n            _triggerEvents(mouseConstraint);\n        });\n\n        return mouseConstraint;\n    };\n\n    /**\n     * Updates the given mouse constraint.\n     * @private\n     * @method update\n     * @param {MouseConstraint} mouseConstraint\n     * @param {body[]} bodies\n     */\n    MouseConstraint.update = function(mouseConstraint, bodies) {\n        var mouse = mouseConstraint.mouse,\n            constraint = mouseConstraint.constraint,\n            body = mouseConstraint.body;\n\n        if (mouse.button === 0) {\n            if (!constraint.bodyB) {\n                for (var i = 0; i < bodies.length; i++) {\n                    body = bodies[i];\n                    if (Bounds.contains(body.bounds, mouse.position) \n                            && Detector.canCollide(body.collisionFilter, mouseConstraint.collisionFilter)) {\n                        for (var j = body.parts.length > 1 ? 1 : 0; j < body.parts.length; j++) {\n                            var part = body.parts[j];\n                            if (Vertices.contains(part.vertices, mouse.position)) {\n                                constraint.pointA = mouse.position;\n                                constraint.bodyB = mouseConstraint.body = body;\n                                constraint.pointB = { x: mouse.position.x - body.position.x, y: mouse.position.y - body.position.y };\n                                constraint.angleB = body.angle;\n\n                                Sleeping.set(body, false);\n                                Events.trigger(mouseConstraint, 'startdrag', { mouse: mouse, body: body });\n\n                                break;\n                            }\n                        }\n                    }\n                }\n            } else {\n                Sleeping.set(constraint.bodyB, false);\n                constraint.pointA = mouse.position;\n            }\n        } else {\n            constraint.bodyB = mouseConstraint.body = null;\n            constraint.pointB = null;\n\n            if (body)\n                Events.trigger(mouseConstraint, 'enddrag', { mouse: mouse, body: body });\n        }\n    };\n\n    /**\n     * Triggers mouse constraint events.\n     * @method _triggerEvents\n     * @private\n     * @param {mouse} mouseConstraint\n     */\n    var _triggerEvents = function(mouseConstraint) {\n        var mouse = mouseConstraint.mouse,\n            mouseEvents = mouse.sourceEvents;\n\n        if (mouseEvents.mousemove)\n            Events.trigger(mouseConstraint, 'mousemove', { mouse: mouse });\n\n        if (mouseEvents.mousedown)\n            Events.trigger(mouseConstraint, 'mousedown', { mouse: mouse });\n\n        if (mouseEvents.mouseup)\n            Events.trigger(mouseConstraint, 'mouseup', { mouse: mouse });\n\n        // reset the mouse state ready for the next step\n        Mouse.clearSourceEvents(mouse);\n    };\n\n    /*\n    *\n    *  Events Documentation\n    *\n    */\n\n    /**\n    * Fired when the mouse has moved (or a touch moves) during the last step\n    *\n    * @event mousemove\n    * @param {} event An event object\n    * @param {mouse} event.mouse The engine's mouse instance\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when the mouse is down (or a touch has started) during the last step\n    *\n    * @event mousedown\n    * @param {} event An event object\n    * @param {mouse} event.mouse The engine's mouse instance\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when the mouse is up (or a touch has ended) during the last step\n    *\n    * @event mouseup\n    * @param {} event An event object\n    * @param {mouse} event.mouse The engine's mouse instance\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when the user starts dragging a body\n    *\n    * @event startdrag\n    * @param {} event An event object\n    * @param {mouse} event.mouse The engine's mouse instance\n    * @param {body} event.body The body being dragged\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired when the user ends dragging a body\n    *\n    * @event enddrag\n    * @param {} event An event object\n    * @param {mouse} event.mouse The engine's mouse instance\n    * @param {body} event.body The body that has stopped being dragged\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * A `String` denoting the type of object.\n     *\n     * @property type\n     * @type string\n     * @default \"constraint\"\n     * @readOnly\n     */\n\n    /**\n     * The `Mouse` instance in use. If not supplied in `MouseConstraint.create`, one will be created.\n     *\n     * @property mouse\n     * @type mouse\n     * @default mouse\n     */\n\n    /**\n     * The `Body` that is currently being moved by the user, or `null` if no body.\n     *\n     * @property body\n     * @type body\n     * @default null\n     */\n\n    /**\n     * The `Constraint` object that is used to move the body during interaction.\n     *\n     * @property constraint\n     * @type constraint\n     */\n\n    /**\n     * An `Object` that specifies the collision filter properties.\n     * The collision filter allows the user to define which types of body this mouse constraint can interact with.\n     * See `body.collisionFilter` for more information.\n     *\n     * @property collisionFilter\n     * @type object\n     */\n\n})();\n\n},{\"../body/Composite\":2,\"../collision/Detector\":5,\"../core/Common\":14,\"../core/Events\":16,\"../core/Mouse\":19,\"../core/Sleeping\":22,\"../geometry/Bounds\":26,\"../geometry/Vertices\":29,\"./Constraint\":12}],14:[function(_dereq_,module,exports){\n/**\n* The `Matter.Common` module contains utility functions that are common to all modules.\n*\n* @class Common\n*/\n\nvar Common = {};\n\nmodule.exports = Common;\n\n(function() {\n\n    Common._nextId = 0;\n    Common._seed = 0;\n    Common._nowStartTime = +(new Date());\n\n    /**\n     * Extends the object in the first argument using the object in the second argument.\n     * @method extend\n     * @param {} obj\n     * @param {boolean} deep\n     * @return {} obj extended\n     */\n    Common.extend = function(obj, deep) {\n        var argsStart,\n            args,\n            deepClone;\n\n        if (typeof deep === 'boolean') {\n            argsStart = 2;\n            deepClone = deep;\n        } else {\n            argsStart = 1;\n            deepClone = true;\n        }\n\n        for (var i = argsStart; i < arguments.length; i++) {\n            var source = arguments[i];\n\n            if (source) {\n                for (var prop in source) {\n                    if (deepClone && source[prop] && source[prop].constructor === Object) {\n                        if (!obj[prop] || obj[prop].constructor === Object) {\n                            obj[prop] = obj[prop] || {};\n                            Common.extend(obj[prop], deepClone, source[prop]);\n                        } else {\n                            obj[prop] = source[prop];\n                        }\n                    } else {\n                        obj[prop] = source[prop];\n                    }\n                }\n            }\n        }\n        \n        return obj;\n    };\n\n    /**\n     * Creates a new clone of the object, if deep is true references will also be cloned.\n     * @method clone\n     * @param {} obj\n     * @param {bool} deep\n     * @return {} obj cloned\n     */\n    Common.clone = function(obj, deep) {\n        return Common.extend({}, deep, obj);\n    };\n\n    /**\n     * Returns the list of keys for the given object.\n     * @method keys\n     * @param {} obj\n     * @return {string[]} keys\n     */\n    Common.keys = function(obj) {\n        if (Object.keys)\n            return Object.keys(obj);\n\n        // avoid hasOwnProperty for performance\n        var keys = [];\n        for (var key in obj)\n            keys.push(key);\n        return keys;\n    };\n\n    /**\n     * Returns the list of values for the given object.\n     * @method values\n     * @param {} obj\n     * @return {array} Array of the objects property values\n     */\n    Common.values = function(obj) {\n        var values = [];\n        \n        if (Object.keys) {\n            var keys = Object.keys(obj);\n            for (var i = 0; i < keys.length; i++) {\n                values.push(obj[keys[i]]);\n            }\n            return values;\n        }\n        \n        // avoid hasOwnProperty for performance\n        for (var key in obj)\n            values.push(obj[key]);\n        return values;\n    };\n\n    /**\n     * Gets a value from `base` relative to the `path` string.\n     * @method get\n     * @param {} obj The base object\n     * @param {string} path The path relative to `base`, e.g. 'Foo.Bar.baz'\n     * @param {number} [begin] Path slice begin\n     * @param {number} [end] Path slice end\n     * @return {} The object at the given path\n     */\n    Common.get = function(obj, path, begin, end) {\n        path = path.split('.').slice(begin, end);\n\n        for (var i = 0; i < path.length; i += 1) {\n            obj = obj[path[i]];\n        }\n\n        return obj;\n    };\n\n    /**\n     * Sets a value on `base` relative to the given `path` string.\n     * @method set\n     * @param {} obj The base object\n     * @param {string} path The path relative to `base`, e.g. 'Foo.Bar.baz'\n     * @param {} val The value to set\n     * @param {number} [begin] Path slice begin\n     * @param {number} [end] Path slice end\n     * @return {} Pass through `val` for chaining\n     */\n    Common.set = function(obj, path, val, begin, end) {\n        var parts = path.split('.').slice(begin, end);\n        Common.get(obj, path, 0, -1)[parts[parts.length - 1]] = val;\n        return val;\n    };\n\n    /**\n     * Shuffles the given array in-place.\n     * The function uses a seeded random generator.\n     * @method shuffle\n     * @param {array} array\n     * @return {array} array shuffled randomly\n     */\n    Common.shuffle = function(array) {\n        for (var i = array.length - 1; i > 0; i--) {\n            var j = Math.floor(Common.random() * (i + 1));\n            var temp = array[i];\n            array[i] = array[j];\n            array[j] = temp;\n        }\n        return array;\n    };\n\n    /**\n     * Randomly chooses a value from a list with equal probability.\n     * The function uses a seeded random generator.\n     * @method choose\n     * @param {array} choices\n     * @return {object} A random choice object from the array\n     */\n    Common.choose = function(choices) {\n        return choices[Math.floor(Common.random() * choices.length)];\n    };\n\n    /**\n     * Returns true if the object is a HTMLElement, otherwise false.\n     * @method isElement\n     * @param {object} obj\n     * @return {boolean} True if the object is a HTMLElement, otherwise false\n     */\n    Common.isElement = function(obj) {\n        return obj instanceof HTMLElement;\n    };\n\n    /**\n     * Returns true if the object is an array.\n     * @method isArray\n     * @param {object} obj\n     * @return {boolean} True if the object is an array, otherwise false\n     */\n    Common.isArray = function(obj) {\n        return Object.prototype.toString.call(obj) === '[object Array]';\n    };\n\n    /**\n     * Returns true if the object is a function.\n     * @method isFunction\n     * @param {object} obj\n     * @return {boolean} True if the object is a function, otherwise false\n     */\n    Common.isFunction = function(obj) {\n        return typeof obj === \"function\";\n    };\n\n    /**\n     * Returns true if the object is a plain object.\n     * @method isPlainObject\n     * @param {object} obj\n     * @return {boolean} True if the object is a plain object, otherwise false\n     */\n    Common.isPlainObject = function(obj) {\n        return typeof obj === 'object' && obj.constructor === Object;\n    };\n\n    /**\n     * Returns true if the object is a string.\n     * @method isString\n     * @param {object} obj\n     * @return {boolean} True if the object is a string, otherwise false\n     */\n    Common.isString = function(obj) {\n        return toString.call(obj) === '[object String]';\n    };\n    \n    /**\n     * Returns the given value clamped between a minimum and maximum value.\n     * @method clamp\n     * @param {number} value\n     * @param {number} min\n     * @param {number} max\n     * @return {number} The value clamped between min and max inclusive\n     */\n    Common.clamp = function(value, min, max) {\n        if (value < min)\n            return min;\n        if (value > max)\n            return max;\n        return value;\n    };\n    \n    /**\n     * Returns the sign of the given value.\n     * @method sign\n     * @param {number} value\n     * @return {number} -1 if negative, +1 if 0 or positive\n     */\n    Common.sign = function(value) {\n        return value < 0 ? -1 : 1;\n    };\n    \n    /**\n     * Returns the current timestamp since the time origin (e.g. from page load).\n     * The result will be high-resolution including decimal places if available.\n     * @method now\n     * @return {number} the current timestamp\n     */\n    Common.now = function() {\n        if (window.performance) {\n            if (window.performance.now) {\n                return window.performance.now();\n            } else if (window.performance.webkitNow) {\n                return window.performance.webkitNow();\n            }\n        }\n\n        return (new Date()) - Common._nowStartTime;\n    };\n    \n    /**\n     * Returns a random value between a minimum and a maximum value inclusive.\n     * The function uses a seeded random generator.\n     * @method random\n     * @param {number} min\n     * @param {number} max\n     * @return {number} A random number between min and max inclusive\n     */\n    Common.random = function(min, max) {\n        min = (typeof min !== \"undefined\") ? min : 0;\n        max = (typeof max !== \"undefined\") ? max : 1;\n        return min + _seededRandom() * (max - min);\n    };\n\n    var _seededRandom = function() {\n        // https://en.wikipedia.org/wiki/Linear_congruential_generator\n        Common._seed = (Common._seed * 9301 + 49297) % 233280;\n        return Common._seed / 233280;\n    };\n\n    /**\n     * Converts a CSS hex colour string into an integer.\n     * @method colorToNumber\n     * @param {string} colorString\n     * @return {number} An integer representing the CSS hex string\n     */\n    Common.colorToNumber = function(colorString) {\n        colorString = colorString.replace('#','');\n\n        if (colorString.length == 3) {\n            colorString = colorString.charAt(0) + colorString.charAt(0)\n                        + colorString.charAt(1) + colorString.charAt(1)\n                        + colorString.charAt(2) + colorString.charAt(2);\n        }\n\n        return parseInt(colorString, 16);\n    };\n\n    /**\n     * The console logging level to use, where each level includes all levels above and excludes the levels below.\n     * The default level is 'debug' which shows all console messages.  \n     *\n     * Possible level values are:\n     * - 0 = None\n     * - 1 = Debug\n     * - 2 = Info\n     * - 3 = Warn\n     * - 4 = Error\n     * @property Common.logLevel\n     * @type {Number}\n     * @default 1\n     */\n    Common.logLevel = 1;\n\n    /**\n     * Shows a `console.log` message only if the current `Common.logLevel` allows it.\n     * The message will be prefixed with 'matter-js' to make it easily identifiable.\n     * @method log\n     * @param ...objs {} The objects to log.\n     */\n    Common.log = function() {\n        if (console && Common.logLevel > 0 && Common.logLevel <= 3) {\n            console.log.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));\n        }\n    };\n\n    /**\n     * Shows a `console.info` message only if the current `Common.logLevel` allows it.\n     * The message will be prefixed with 'matter-js' to make it easily identifiable.\n     * @method info\n     * @param ...objs {} The objects to log.\n     */\n    Common.info = function() {\n        if (console && Common.logLevel > 0 && Common.logLevel <= 2) {\n            console.info.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));\n        }\n    };\n\n    /**\n     * Shows a `console.warn` message only if the current `Common.logLevel` allows it.\n     * The message will be prefixed with 'matter-js' to make it easily identifiable.\n     * @method warn\n     * @param ...objs {} The objects to log.\n     */\n    Common.warn = function() {\n        if (console && Common.logLevel > 0 && Common.logLevel <= 3) {\n            console.warn.apply(console, ['matter-js:'].concat(Array.prototype.slice.call(arguments)));\n        }\n    };\n\n    /**\n     * Returns the next unique sequential ID.\n     * @method nextId\n     * @return {Number} Unique sequential ID\n     */\n    Common.nextId = function() {\n        return Common._nextId++;\n    };\n\n    /**\n     * A cross browser compatible indexOf implementation.\n     * @method indexOf\n     * @param {array} haystack\n     * @param {object} needle\n     * @return {number} The position of needle in haystack, otherwise -1.\n     */\n    Common.indexOf = function(haystack, needle) {\n        if (haystack.indexOf)\n            return haystack.indexOf(needle);\n\n        for (var i = 0; i < haystack.length; i++) {\n            if (haystack[i] === needle)\n                return i;\n        }\n\n        return -1;\n    };\n\n    /**\n     * A cross browser compatible array map implementation.\n     * @method map\n     * @param {array} list\n     * @param {function} func\n     * @return {array} Values from list transformed by func.\n     */\n    Common.map = function(list, func) {\n        if (list.map) {\n            return list.map(func);\n        }\n\n        var mapped = [];\n\n        for (var i = 0; i < list.length; i += 1) {\n            mapped.push(func(list[i]));\n        }\n\n        return mapped;\n    };\n\n    /**\n     * Takes a directed graph and returns the partially ordered set of vertices in topological order.\n     * Circular dependencies are allowed.\n     * @method topologicalSort\n     * @param {object} graph\n     * @return {array} Partially ordered set of vertices in topological order.\n     */\n    Common.topologicalSort = function(graph) {\n        // https://github.com/mgechev/javascript-algorithms\n        // Copyright (c) Minko Gechev (MIT license)\n        // Modifications: tidy formatting and naming\n        var result = [],\n            visited = [],\n            temp = [];\n\n        for (var node in graph) {\n            if (!visited[node] && !temp[node]) {\n                _topologicalSort(node, visited, temp, graph, result);\n            }\n        }\n\n        return result;\n    };\n\n    var _topologicalSort = function(node, visited, temp, graph, result) {\n        var neighbors = graph[node] || [];\n        temp[node] = true;\n\n        for (var i = 0; i < neighbors.length; i += 1) {\n            var neighbor = neighbors[i];\n\n            if (temp[neighbor]) {\n                // skip circular dependencies\n                continue;\n            }\n\n            if (!visited[neighbor]) {\n                _topologicalSort(neighbor, visited, temp, graph, result);\n            }\n        }\n\n        temp[node] = false;\n        visited[node] = true;\n\n        result.push(node);\n    };\n\n    /**\n     * Takes _n_ functions as arguments and returns a new function that calls them in order.\n     * The arguments applied when calling the new function will also be applied to every function passed.\n     * The value of `this` refers to the last value returned in the chain that was not `undefined`.\n     * Therefore if a passed function does not return a value, the previously returned value is maintained.\n     * After all passed functions have been called the new function returns the last returned value (if any).\n     * If any of the passed functions are a chain, then the chain will be flattened.\n     * @method chain\n     * @param ...funcs {function} The functions to chain.\n     * @return {function} A new function that calls the passed functions in order.\n     */\n    Common.chain = function() {\n        var funcs = [];\n\n        for (var i = 0; i < arguments.length; i += 1) {\n            var func = arguments[i];\n\n            if (func._chained) {\n                // flatten already chained functions\n                funcs.push.apply(funcs, func._chained);\n            } else {\n                funcs.push(func);\n            }\n        }\n\n        var chain = function() {\n            // https://github.com/GoogleChrome/devtools-docs/issues/53#issuecomment-51941358\n            var lastResult,\n                args = new Array(arguments.length);\n\n            for (var i = 0, l = arguments.length; i < l; i++) {\n                args[i] = arguments[i];\n            }\n\n            for (i = 0; i < funcs.length; i += 1) {\n                var result = funcs[i].apply(lastResult, args);\n\n                if (typeof result !== 'undefined') {\n                    lastResult = result;\n                }\n            }\n\n            return lastResult;\n        };\n\n        chain._chained = funcs;\n\n        return chain;\n    };\n\n    /**\n     * Chains a function to excute before the original function on the given `path` relative to `base`.\n     * See also docs for `Common.chain`.\n     * @method chainPathBefore\n     * @param {} base The base object\n     * @param {string} path The path relative to `base`\n     * @param {function} func The function to chain before the original\n     * @return {function} The chained function that replaced the original\n     */\n    Common.chainPathBefore = function(base, path, func) {\n        return Common.set(base, path, Common.chain(\n            func,\n            Common.get(base, path)\n        ));\n    };\n\n    /**\n     * Chains a function to excute after the original function on the given `path` relative to `base`.\n     * See also docs for `Common.chain`.\n     * @method chainPathAfter\n     * @param {} base The base object\n     * @param {string} path The path relative to `base`\n     * @param {function} func The function to chain after the original\n     * @return {function} The chained function that replaced the original\n     */\n    Common.chainPathAfter = function(base, path, func) {\n        return Common.set(base, path, Common.chain(\n            Common.get(base, path),\n            func\n        ));\n    };\n\n})();\n\n},{}],15:[function(_dereq_,module,exports){\n/**\n* The `Matter.Engine` module contains methods for creating and manipulating engines.\n* An engine is a controller that manages updating the simulation of the world.\n* See `Matter.Runner` for an optional game loop utility.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Engine\n*/\n\nvar Engine = {};\n\nmodule.exports = Engine;\n\nvar World = _dereq_('../body/World');\nvar Sleeping = _dereq_('./Sleeping');\nvar Resolver = _dereq_('../collision/Resolver');\nvar Render = _dereq_('../render/Render');\nvar Pairs = _dereq_('../collision/Pairs');\nvar Metrics = _dereq_('./Metrics');\nvar Grid = _dereq_('../collision/Grid');\nvar Events = _dereq_('./Events');\nvar Composite = _dereq_('../body/Composite');\nvar Constraint = _dereq_('../constraint/Constraint');\nvar Common = _dereq_('./Common');\nvar Body = _dereq_('../body/Body');\n\n(function() {\n\n    /**\n     * Creates a new engine. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * All properties have default values, and many are pre-calculated automatically based on other properties.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {object} [options]\n     * @return {engine} engine\n     */\n    Engine.create = function(element, options) {\n        // options may be passed as the first (and only) argument\n        options = Common.isElement(element) ? options : element;\n        element = Common.isElement(element) ? element : null;\n        options = options || {};\n\n        if (element || options.render) {\n            Common.warn('Engine.create: engine.render is deprecated (see docs)');\n        }\n\n        var defaults = {\n            positionIterations: 6,\n            velocityIterations: 4,\n            constraintIterations: 2,\n            enableSleeping: false,\n            events: [],\n            plugin: {},\n            timing: {\n                timestamp: 0,\n                timeScale: 1\n            },\n            broadphase: {\n                controller: Grid\n            }\n        };\n\n        var engine = Common.extend(defaults, options);\n\n        // @deprecated\n        if (element || engine.render) {\n            var renderDefaults = {\n                element: element,\n                controller: Render\n            };\n            \n            engine.render = Common.extend(renderDefaults, engine.render);\n        }\n\n        // @deprecated\n        if (engine.render && engine.render.controller) {\n            engine.render = engine.render.controller.create(engine.render);\n        }\n\n        // @deprecated\n        if (engine.render) {\n            engine.render.engine = engine;\n        }\n\n        engine.world = options.world || World.create(engine.world);\n        engine.pairs = Pairs.create();\n        engine.broadphase = engine.broadphase.controller.create(engine.broadphase);\n        engine.metrics = engine.metrics || { extended: false };\n\n\n        return engine;\n    };\n\n    /**\n     * Moves the simulation forward in time by `delta` ms.\n     * The `correction` argument is an optional `Number` that specifies the time correction factor to apply to the update.\n     * This can help improve the accuracy of the simulation in cases where `delta` is changing between updates.\n     * The value of `correction` is defined as `delta / lastDelta`, i.e. the percentage change of `delta` over the last step.\n     * Therefore the value is always `1` (no correction) when `delta` constant (or when no correction is desired, which is the default).\n     * See the paper on <a href=\"http://lonesock.net/article/verlet.html\">Time Corrected Verlet</a> for more information.\n     *\n     * Triggers `beforeUpdate` and `afterUpdate` events.\n     * Triggers `collisionStart`, `collisionActive` and `collisionEnd` events.\n     * @method update\n     * @param {engine} engine\n     * @param {number} [delta=16.666]\n     * @param {number} [correction=1]\n     */\n    Engine.update = function(engine, delta, correction) {\n        delta = delta || 1000 / 60;\n        correction = correction || 1;\n\n        var world = engine.world,\n            timing = engine.timing,\n            broadphase = engine.broadphase,\n            broadphasePairs = [],\n            i;\n\n        // increment timestamp\n        timing.timestamp += delta * timing.timeScale;\n\n        // create an event object\n        var event = {\n            timestamp: timing.timestamp\n        };\n\n        Events.trigger(engine, 'beforeUpdate', event);\n\n        // get lists of all bodies and constraints, no matter what composites they are in\n        var allBodies = Composite.allBodies(world),\n            allConstraints = Composite.allConstraints(world);\n\n\n        // if sleeping enabled, call the sleeping controller\n        if (engine.enableSleeping)\n            Sleeping.update(allBodies, timing.timeScale);\n\n        // applies gravity to all bodies\n        _bodiesApplyGravity(allBodies, world.gravity);\n\n        // update all body position and rotation by integration\n        _bodiesUpdate(allBodies, delta, timing.timeScale, correction, world.bounds);\n\n        // update all constraints (first pass)\n        Constraint.preSolveAll(allBodies);\n        for (i = 0; i < engine.constraintIterations; i++) {\n            Constraint.solveAll(allConstraints, timing.timeScale);\n        }\n        Constraint.postSolveAll(allBodies);\n\n        // broadphase pass: find potential collision pairs\n        if (broadphase.controller) {\n            // if world is dirty, we must flush the whole grid\n            if (world.isModified)\n                broadphase.controller.clear(broadphase);\n\n            // update the grid buckets based on current bodies\n            broadphase.controller.update(broadphase, allBodies, engine, world.isModified);\n            broadphasePairs = broadphase.pairsList;\n        } else {\n            // if no broadphase set, we just pass all bodies\n            broadphasePairs = allBodies;\n        }\n\n        // clear all composite modified flags\n        if (world.isModified) {\n            Composite.setModified(world, false, false, true);\n        }\n\n        // narrowphase pass: find actual collisions, then create or update collision pairs\n        var collisions = broadphase.detector(broadphasePairs, engine);\n\n        // update collision pairs\n        var pairs = engine.pairs,\n            timestamp = timing.timestamp;\n        Pairs.update(pairs, collisions, timestamp);\n        Pairs.removeOld(pairs, timestamp);\n\n        // wake up bodies involved in collisions\n        if (engine.enableSleeping)\n            Sleeping.afterCollisions(pairs.list, timing.timeScale);\n\n        // trigger collision events\n        if (pairs.collisionStart.length > 0)\n            Events.trigger(engine, 'collisionStart', { pairs: pairs.collisionStart });\n\n        // iteratively resolve position between collisions\n        Resolver.preSolvePosition(pairs.list);\n        for (i = 0; i < engine.positionIterations; i++) {\n            Resolver.solvePosition(pairs.list, timing.timeScale);\n        }\n        Resolver.postSolvePosition(allBodies);\n\n        // update all constraints (second pass)\n        Constraint.preSolveAll(allBodies);\n        for (i = 0; i < engine.constraintIterations; i++) {\n            Constraint.solveAll(allConstraints, timing.timeScale);\n        }\n        Constraint.postSolveAll(allBodies);\n\n        // iteratively resolve velocity between collisions\n        Resolver.preSolveVelocity(pairs.list);\n        for (i = 0; i < engine.velocityIterations; i++) {\n            Resolver.solveVelocity(pairs.list, timing.timeScale);\n        }\n\n        // trigger collision events\n        if (pairs.collisionActive.length > 0)\n            Events.trigger(engine, 'collisionActive', { pairs: pairs.collisionActive });\n\n        if (pairs.collisionEnd.length > 0)\n            Events.trigger(engine, 'collisionEnd', { pairs: pairs.collisionEnd });\n\n\n        // clear force buffers\n        _bodiesClearForces(allBodies);\n\n        Events.trigger(engine, 'afterUpdate', event);\n\n        return engine;\n    };\n    \n    /**\n     * Merges two engines by keeping the configuration of `engineA` but replacing the world with the one from `engineB`.\n     * @method merge\n     * @param {engine} engineA\n     * @param {engine} engineB\n     */\n    Engine.merge = function(engineA, engineB) {\n        Common.extend(engineA, engineB);\n        \n        if (engineB.world) {\n            engineA.world = engineB.world;\n\n            Engine.clear(engineA);\n\n            var bodies = Composite.allBodies(engineA.world);\n\n            for (var i = 0; i < bodies.length; i++) {\n                var body = bodies[i];\n                Sleeping.set(body, false);\n                body.id = Common.nextId();\n            }\n        }\n    };\n\n    /**\n     * Clears the engine including the world, pairs and broadphase.\n     * @method clear\n     * @param {engine} engine\n     */\n    Engine.clear = function(engine) {\n        var world = engine.world;\n        \n        Pairs.clear(engine.pairs);\n\n        var broadphase = engine.broadphase;\n        if (broadphase.controller) {\n            var bodies = Composite.allBodies(world);\n            broadphase.controller.clear(broadphase);\n            broadphase.controller.update(broadphase, bodies, engine, true);\n        }\n    };\n\n    /**\n     * Zeroes the `body.force` and `body.torque` force buffers.\n     * @method bodiesClearForces\n     * @private\n     * @param {body[]} bodies\n     */\n    var _bodiesClearForces = function(bodies) {\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            // reset force buffers\n            body.force.x = 0;\n            body.force.y = 0;\n            body.torque = 0;\n        }\n    };\n\n    /**\n     * Applys a mass dependant force to all given bodies.\n     * @method bodiesApplyGravity\n     * @private\n     * @param {body[]} bodies\n     * @param {vector} gravity\n     */\n    var _bodiesApplyGravity = function(bodies, gravity) {\n        var gravityScale = typeof gravity.scale !== 'undefined' ? gravity.scale : 0.001;\n\n        if ((gravity.x === 0 && gravity.y === 0) || gravityScale === 0) {\n            return;\n        }\n        \n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (body.isStatic || body.isSleeping)\n                continue;\n\n            // apply gravity\n            body.force.y += body.mass * gravity.y * gravityScale;\n            body.force.x += body.mass * gravity.x * gravityScale;\n        }\n    };\n\n    /**\n     * Applys `Body.update` to all given `bodies`.\n     * @method updateAll\n     * @private\n     * @param {body[]} bodies\n     * @param {number} deltaTime \n     * The amount of time elapsed between updates\n     * @param {number} timeScale\n     * @param {number} correction \n     * The Verlet correction factor (deltaTime / lastDeltaTime)\n     * @param {bounds} worldBounds\n     */\n    var _bodiesUpdate = function(bodies, deltaTime, timeScale, correction, worldBounds) {\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (body.isStatic || body.isSleeping)\n                continue;\n\n            Body.update(body, deltaTime, timeScale, correction);\n        }\n    };\n\n    /**\n     * An alias for `Runner.run`, see `Matter.Runner` for more information.\n     * @method run\n     * @param {engine} engine\n     */\n\n    /**\n    * Fired just before an update\n    *\n    * @event beforeUpdate\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after engine update and all collision events\n    *\n    * @event afterUpdate\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after engine update, provides a list of all pairs that have started to collide in the current tick (if any)\n    *\n    * @event collisionStart\n    * @param {} event An event object\n    * @param {} event.pairs List of affected pairs\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after engine update, provides a list of all pairs that are colliding in the current tick (if any)\n    *\n    * @event collisionActive\n    * @param {} event An event object\n    * @param {} event.pairs List of affected pairs\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after engine update, provides a list of all pairs that have ended collision in the current tick (if any)\n    *\n    * @event collisionEnd\n    * @param {} event An event object\n    * @param {} event.pairs List of affected pairs\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * An integer `Number` that specifies the number of position iterations to perform each update.\n     * The higher the value, the higher quality the simulation will be at the expense of performance.\n     *\n     * @property positionIterations\n     * @type number\n     * @default 6\n     */\n\n    /**\n     * An integer `Number` that specifies the number of velocity iterations to perform each update.\n     * The higher the value, the higher quality the simulation will be at the expense of performance.\n     *\n     * @property velocityIterations\n     * @type number\n     * @default 4\n     */\n\n    /**\n     * An integer `Number` that specifies the number of constraint iterations to perform each update.\n     * The higher the value, the higher quality the simulation will be at the expense of performance.\n     * The default value of `2` is usually very adequate.\n     *\n     * @property constraintIterations\n     * @type number\n     * @default 2\n     */\n\n    /**\n     * A flag that specifies whether the engine should allow sleeping via the `Matter.Sleeping` module.\n     * Sleeping can improve stability and performance, but often at the expense of accuracy.\n     *\n     * @property enableSleeping\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * An `Object` containing properties regarding the timing systems of the engine. \n     *\n     * @property timing\n     * @type object\n     */\n\n    /**\n     * A `Number` that specifies the global scaling factor of time for all bodies.\n     * A value of `0` freezes the simulation.\n     * A value of `0.1` gives a slow-motion effect.\n     * A value of `1.2` gives a speed-up effect.\n     *\n     * @property timing.timeScale\n     * @type number\n     * @default 1\n     */\n\n    /**\n     * A `Number` that specifies the current simulation-time in milliseconds starting from `0`. \n     * It is incremented on every `Engine.update` by the given `delta` argument. \n     *\n     * @property timing.timestamp\n     * @type number\n     * @default 0\n     */\n\n    /**\n     * An instance of a `Render` controller. The default value is a `Matter.Render` instance created by `Engine.create`.\n     * One may also develop a custom renderer module based on `Matter.Render` and pass an instance of it to `Engine.create` via `options.render`.\n     *\n     * A minimal custom renderer object must define at least three functions: `create`, `clear` and `world` (see `Matter.Render`).\n     * It is also possible to instead pass the _module_ reference via `options.render.controller` and `Engine.create` will instantiate one for you.\n     *\n     * @property render\n     * @type render\n     * @deprecated see Demo.js for an example of creating a renderer\n     * @default a Matter.Render instance\n     */\n\n    /**\n     * An instance of a broadphase controller. The default value is a `Matter.Grid` instance created by `Engine.create`.\n     *\n     * @property broadphase\n     * @type grid\n     * @default a Matter.Grid instance\n     */\n\n    /**\n     * A `World` composite object that will contain all simulated bodies and constraints.\n     *\n     * @property world\n     * @type world\n     * @default a Matter.World instance\n     */\n\n    /**\n     * An object reserved for storing plugin-specific properties.\n     *\n     * @property plugin\n     * @type {}\n     */\n\n})();\n\n},{\"../body/Body\":1,\"../body/Composite\":2,\"../body/World\":3,\"../collision/Grid\":6,\"../collision/Pairs\":8,\"../collision/Resolver\":10,\"../constraint/Constraint\":12,\"../render/Render\":31,\"./Common\":14,\"./Events\":16,\"./Metrics\":18,\"./Sleeping\":22}],16:[function(_dereq_,module,exports){\n/**\n* The `Matter.Events` module contains methods to fire and listen to events on other objects.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Events\n*/\n\nvar Events = {};\n\nmodule.exports = Events;\n\nvar Common = _dereq_('./Common');\n\n(function() {\n\n    /**\n     * Subscribes a callback function to the given object's `eventName`.\n     * @method on\n     * @param {} object\n     * @param {string} eventNames\n     * @param {function} callback\n     */\n    Events.on = function(object, eventNames, callback) {\n        var names = eventNames.split(' '),\n            name;\n\n        for (var i = 0; i < names.length; i++) {\n            name = names[i];\n            object.events = object.events || {};\n            object.events[name] = object.events[name] || [];\n            object.events[name].push(callback);\n        }\n\n        return callback;\n    };\n\n    /**\n     * Removes the given event callback. If no callback, clears all callbacks in `eventNames`. If no `eventNames`, clears all events.\n     * @method off\n     * @param {} object\n     * @param {string} eventNames\n     * @param {function} callback\n     */\n    Events.off = function(object, eventNames, callback) {\n        if (!eventNames) {\n            object.events = {};\n            return;\n        }\n\n        // handle Events.off(object, callback)\n        if (typeof eventNames === 'function') {\n            callback = eventNames;\n            eventNames = Common.keys(object.events).join(' ');\n        }\n\n        var names = eventNames.split(' ');\n\n        for (var i = 0; i < names.length; i++) {\n            var callbacks = object.events[names[i]],\n                newCallbacks = [];\n\n            if (callback && callbacks) {\n                for (var j = 0; j < callbacks.length; j++) {\n                    if (callbacks[j] !== callback)\n                        newCallbacks.push(callbacks[j]);\n                }\n            }\n\n            object.events[names[i]] = newCallbacks;\n        }\n    };\n\n    /**\n     * Fires all the callbacks subscribed to the given object's `eventName`, in the order they subscribed, if any.\n     * @method trigger\n     * @param {} object\n     * @param {string} eventNames\n     * @param {} event\n     */\n    Events.trigger = function(object, eventNames, event) {\n        var names,\n            name,\n            callbacks,\n            eventClone;\n\n        if (object.events) {\n            if (!event)\n                event = {};\n\n            names = eventNames.split(' ');\n\n            for (var i = 0; i < names.length; i++) {\n                name = names[i];\n                callbacks = object.events[name];\n\n                if (callbacks) {\n                    eventClone = Common.clone(event, false);\n                    eventClone.name = name;\n                    eventClone.source = object;\n\n                    for (var j = 0; j < callbacks.length; j++) {\n                        callbacks[j].apply(object, [eventClone]);\n                    }\n                }\n            }\n        }\n    };\n\n})();\n\n},{\"./Common\":14}],17:[function(_dereq_,module,exports){\n/**\n* The `Matter` module is the top level namespace. It also includes a function for installing plugins on top of the library.\n*\n* @class Matter\n*/\n\nvar Matter = {};\n\nmodule.exports = Matter;\n\nvar Plugin = _dereq_('./Plugin');\nvar Common = _dereq_('./Common');\n\n(function() {\n\n    /**\n     * The library name.\n     * @property name\n     * @readOnly\n     * @type {String}\n     */\n    Matter.name = 'matter-js';\n\n    /**\n     * The library version.\n     * @property version\n     * @readOnly\n     * @type {String}\n     */\n    Matter.version = '0.13.0';\n\n    /**\n     * A list of plugin dependencies to be installed. These are normally set and installed through `Matter.use`.\n     * Alternatively you may set `Matter.uses` manually and install them by calling `Plugin.use(Matter)`.\n     * @property uses\n     * @type {Array}\n     */\n    Matter.uses = [];\n\n    /**\n     * The plugins that have been installed through `Matter.Plugin.install`. Read only.\n     * @property used\n     * @readOnly\n     * @type {Array}\n     */\n    Matter.used = [];\n\n    /**\n     * Installs the given plugins on the `Matter` namespace.\n     * This is a short-hand for `Plugin.use`, see it for more information.\n     * Call this function once at the start of your code, with all of the plugins you wish to install as arguments.\n     * Avoid calling this function multiple times unless you intend to manually control installation order.\n     * @method use\n     * @param ...plugin {Function} The plugin(s) to install on `base` (multi-argument).\n     */\n    Matter.use = function() {\n        Plugin.use(Matter, Array.prototype.slice.call(arguments));\n    };\n\n    /**\n     * Chains a function to excute before the original function on the given `path` relative to `Matter`.\n     * See also docs for `Common.chain`.\n     * @method before\n     * @param {string} path The path relative to `Matter`\n     * @param {function} func The function to chain before the original\n     * @return {function} The chained function that replaced the original\n     */\n    Matter.before = function(path, func) {\n        path = path.replace(/^Matter./, '');\n        return Common.chainPathBefore(Matter, path, func);\n    };\n\n    /**\n     * Chains a function to excute after the original function on the given `path` relative to `Matter`.\n     * See also docs for `Common.chain`.\n     * @method after\n     * @param {string} path The path relative to `Matter`\n     * @param {function} func The function to chain after the original\n     * @return {function} The chained function that replaced the original\n     */\n    Matter.after = function(path, func) {\n        path = path.replace(/^Matter./, '');\n        return Common.chainPathAfter(Matter, path, func);\n    };\n\n})();\n\n},{\"./Common\":14,\"./Plugin\":20}],18:[function(_dereq_,module,exports){\n\n},{\"../body/Composite\":2,\"./Common\":14}],19:[function(_dereq_,module,exports){\n/**\n* The `Matter.Mouse` module contains methods for creating and manipulating mouse inputs.\n*\n* @class Mouse\n*/\n\nvar Mouse = {};\n\nmodule.exports = Mouse;\n\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    /**\n     * Creates a mouse input.\n     * @method create\n     * @param {HTMLElement} element\n     * @return {mouse} A new mouse\n     */\n    Mouse.create = function(element) {\n        var mouse = {};\n\n        if (!element) {\n            Common.log('Mouse.create: element was undefined, defaulting to document.body', 'warn');\n        }\n        \n        mouse.element = element || document.body;\n        mouse.absolute = { x: 0, y: 0 };\n        mouse.position = { x: 0, y: 0 };\n        mouse.mousedownPosition = { x: 0, y: 0 };\n        mouse.mouseupPosition = { x: 0, y: 0 };\n        mouse.offset = { x: 0, y: 0 };\n        mouse.scale = { x: 1, y: 1 };\n        mouse.wheelDelta = 0;\n        mouse.button = -1;\n        mouse.pixelRatio = mouse.element.getAttribute('data-pixel-ratio') || 1;\n\n        mouse.sourceEvents = {\n            mousemove: null,\n            mousedown: null,\n            mouseup: null,\n            mousewheel: null\n        };\n        \n        mouse.mousemove = function(event) { \n            var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),\n                touches = event.changedTouches;\n\n            if (touches) {\n                mouse.button = 0;\n                event.preventDefault();\n            }\n\n            mouse.absolute.x = position.x;\n            mouse.absolute.y = position.y;\n            mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;\n            mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;\n            mouse.sourceEvents.mousemove = event;\n        };\n        \n        mouse.mousedown = function(event) {\n            var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),\n                touches = event.changedTouches;\n\n            if (touches) {\n                mouse.button = 0;\n                event.preventDefault();\n            } else {\n                mouse.button = event.button;\n            }\n\n            mouse.absolute.x = position.x;\n            mouse.absolute.y = position.y;\n            mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;\n            mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;\n            mouse.mousedownPosition.x = mouse.position.x;\n            mouse.mousedownPosition.y = mouse.position.y;\n            mouse.sourceEvents.mousedown = event;\n        };\n        \n        mouse.mouseup = function(event) {\n            var position = _getRelativeMousePosition(event, mouse.element, mouse.pixelRatio),\n                touches = event.changedTouches;\n\n            if (touches) {\n                event.preventDefault();\n            }\n            \n            mouse.button = -1;\n            mouse.absolute.x = position.x;\n            mouse.absolute.y = position.y;\n            mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;\n            mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;\n            mouse.mouseupPosition.x = mouse.position.x;\n            mouse.mouseupPosition.y = mouse.position.y;\n            mouse.sourceEvents.mouseup = event;\n        };\n\n        mouse.mousewheel = function(event) {\n            mouse.wheelDelta = Math.max(-1, Math.min(1, event.wheelDelta || -event.detail));\n            event.preventDefault();\n        };\n\n        Mouse.setElement(mouse, mouse.element);\n\n        return mouse;\n    };\n\n    /**\n     * Sets the element the mouse is bound to (and relative to).\n     * @method setElement\n     * @param {mouse} mouse\n     * @param {HTMLElement} element\n     */\n    Mouse.setElement = function(mouse, element) {\n        mouse.element = element;\n\n        element.addEventListener('mousemove', mouse.mousemove);\n        element.addEventListener('mousedown', mouse.mousedown);\n        element.addEventListener('mouseup', mouse.mouseup);\n        \n        element.addEventListener('mousewheel', mouse.mousewheel);\n        element.addEventListener('DOMMouseScroll', mouse.mousewheel);\n\n        element.addEventListener('touchmove', mouse.mousemove);\n        element.addEventListener('touchstart', mouse.mousedown);\n        element.addEventListener('touchend', mouse.mouseup);\n    };\n\n    /**\n     * Clears all captured source events.\n     * @method clearSourceEvents\n     * @param {mouse} mouse\n     */\n    Mouse.clearSourceEvents = function(mouse) {\n        mouse.sourceEvents.mousemove = null;\n        mouse.sourceEvents.mousedown = null;\n        mouse.sourceEvents.mouseup = null;\n        mouse.sourceEvents.mousewheel = null;\n        mouse.wheelDelta = 0;\n    };\n\n    /**\n     * Sets the mouse position offset.\n     * @method setOffset\n     * @param {mouse} mouse\n     * @param {vector} offset\n     */\n    Mouse.setOffset = function(mouse, offset) {\n        mouse.offset.x = offset.x;\n        mouse.offset.y = offset.y;\n        mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;\n        mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;\n    };\n\n    /**\n     * Sets the mouse position scale.\n     * @method setScale\n     * @param {mouse} mouse\n     * @param {vector} scale\n     */\n    Mouse.setScale = function(mouse, scale) {\n        mouse.scale.x = scale.x;\n        mouse.scale.y = scale.y;\n        mouse.position.x = mouse.absolute.x * mouse.scale.x + mouse.offset.x;\n        mouse.position.y = mouse.absolute.y * mouse.scale.y + mouse.offset.y;\n    };\n    \n    /**\n     * Gets the mouse position relative to an element given a screen pixel ratio.\n     * @method _getRelativeMousePosition\n     * @private\n     * @param {} event\n     * @param {} element\n     * @param {number} pixelRatio\n     * @return {}\n     */\n    var _getRelativeMousePosition = function(event, element, pixelRatio) {\n        var elementBounds = element.getBoundingClientRect(),\n            rootNode = (document.documentElement || document.body.parentNode || document.body),\n            scrollX = (window.pageXOffset !== undefined) ? window.pageXOffset : rootNode.scrollLeft,\n            scrollY = (window.pageYOffset !== undefined) ? window.pageYOffset : rootNode.scrollTop,\n            touches = event.changedTouches,\n            x, y;\n        \n        if (touches) {\n            x = touches[0].pageX - elementBounds.left - scrollX;\n            y = touches[0].pageY - elementBounds.top - scrollY;\n        } else {\n            x = event.pageX - elementBounds.left - scrollX;\n            y = event.pageY - elementBounds.top - scrollY;\n        }\n\n        return { \n            x: x / (element.clientWidth / (element.width || element.clientWidth) * pixelRatio),\n            y: y / (element.clientHeight / (element.height || element.clientHeight) * pixelRatio)\n        };\n    };\n\n})();\n\n},{\"../core/Common\":14}],20:[function(_dereq_,module,exports){\n/**\n* The `Matter.Plugin` module contains functions for registering and installing plugins on modules.\n*\n* @class Plugin\n*/\n\nvar Plugin = {};\n\nmodule.exports = Plugin;\n\nvar Common = _dereq_('./Common');\n\n(function() {\n\n    Plugin._registry = {};\n\n    /**\n     * Registers a plugin object so it can be resolved later by name.\n     * @method register\n     * @param plugin {} The plugin to register.\n     * @return {object} The plugin.\n     */\n    Plugin.register = function(plugin) {\n        if (!Plugin.isPlugin(plugin)) {\n            Common.warn('Plugin.register:', Plugin.toString(plugin), 'does not implement all required fields.');\n        }\n\n        if (plugin.name in Plugin._registry) {\n            var registered = Plugin._registry[plugin.name],\n                pluginVersion = Plugin.versionParse(plugin.version).number,\n                registeredVersion = Plugin.versionParse(registered.version).number;\n\n            if (pluginVersion > registeredVersion) {\n                Common.warn('Plugin.register:', Plugin.toString(registered), 'was upgraded to', Plugin.toString(plugin));\n                Plugin._registry[plugin.name] = plugin;\n            } else if (pluginVersion < registeredVersion) {\n                Common.warn('Plugin.register:', Plugin.toString(registered), 'can not be downgraded to', Plugin.toString(plugin));\n            } else if (plugin !== registered) {\n                Common.warn('Plugin.register:', Plugin.toString(plugin), 'is already registered to different plugin object');\n            }\n        } else {\n            Plugin._registry[plugin.name] = plugin;\n        }\n\n        return plugin;\n    };\n\n    /**\n     * Resolves a dependency to a plugin object from the registry if it exists. \n     * The `dependency` may contain a version, but only the name matters when resolving.\n     * @method resolve\n     * @param dependency {string} The dependency.\n     * @return {object} The plugin if resolved, otherwise `undefined`.\n     */\n    Plugin.resolve = function(dependency) {\n        return Plugin._registry[Plugin.dependencyParse(dependency).name];\n    };\n\n    /**\n     * Returns a pretty printed plugin name and version.\n     * @method toString\n     * @param plugin {} The plugin.\n     * @return {string} Pretty printed plugin name and version.\n     */\n    Plugin.toString = function(plugin) {\n        return typeof plugin === 'string' ? plugin : (plugin.name || 'anonymous') + '@' + (plugin.version || plugin.range || '0.0.0');\n    };\n\n    /**\n     * Returns `true` if the object meets the minimum standard to be considered a plugin.\n     * This means it must define the following properties:\n     * - `name`\n     * - `version`\n     * - `install`\n     * @method isPlugin\n     * @param obj {} The obj to test.\n     * @return {boolean} `true` if the object can be considered a plugin otherwise `false`.\n     */\n    Plugin.isPlugin = function(obj) {\n        return obj && obj.name && obj.version && obj.install;\n    };\n\n    /**\n     * Returns `true` if a plugin with the given `name` been installed on `module`.\n     * @method isUsed\n     * @param module {} The module.\n     * @param name {string} The plugin name.\n     * @return {boolean} `true` if a plugin with the given `name` been installed on `module`, otherwise `false`.\n     */\n    Plugin.isUsed = function(module, name) {\n        return module.used.indexOf(name) > -1;\n    };\n\n    /**\n     * Returns `true` if `plugin.for` is applicable to `module` by comparing against `module.name` and `module.version`.\n     * If `plugin.for` is not specified then it is assumed to be applicable.\n     * The value of `plugin.for` is a string of the format `'module-name'` or `'module-name@version'`.\n     * @method isFor\n     * @param plugin {} The plugin.\n     * @param module {} The module.\n     * @return {boolean} `true` if `plugin.for` is applicable to `module`, otherwise `false`.\n     */\n    Plugin.isFor = function(plugin, module) {\n        var parsed = plugin.for && Plugin.dependencyParse(plugin.for);\n        return !plugin.for || (module.name === parsed.name && Plugin.versionSatisfies(module.version, parsed.range));\n    };\n\n    /**\n     * Installs the plugins by calling `plugin.install` on each plugin specified in `plugins` if passed, otherwise `module.uses`.\n     * For installing plugins on `Matter` see the convenience function `Matter.use`.\n     * Plugins may be specified either by their name or a reference to the plugin object.\n     * Plugins themselves may specify further dependencies, but each plugin is installed only once.\n     * Order is important, a topological sort is performed to find the best resulting order of installation.\n     * This sorting attempts to satisfy every dependency's requested ordering, but may not be exact in all cases.\n     * This function logs the resulting status of each dependency in the console, along with any warnings.\n     * - A green tick ✅ indicates a dependency was resolved and installed.\n     * - An orange diamond 🔶 indicates a dependency was resolved but a warning was thrown for it or one if its dependencies.\n     * - A red cross ❌ indicates a dependency could not be resolved.\n     * Avoid calling this function multiple times on the same module unless you intend to manually control installation order.\n     * @method use\n     * @param module {} The module install plugins on.\n     * @param [plugins=module.uses] {} The plugins to install on module (optional, defaults to `module.uses`).\n     */\n    Plugin.use = function(module, plugins) {\n        module.uses = (module.uses || []).concat(plugins || []);\n\n        if (module.uses.length === 0) {\n            Common.warn('Plugin.use:', Plugin.toString(module), 'does not specify any dependencies to install.');\n            return;\n        }\n\n        var dependencies = Plugin.dependencies(module),\n            sortedDependencies = Common.topologicalSort(dependencies),\n            status = [];\n\n        for (var i = 0; i < sortedDependencies.length; i += 1) {\n            if (sortedDependencies[i] === module.name) {\n                continue;\n            }\n\n            var plugin = Plugin.resolve(sortedDependencies[i]);\n\n            if (!plugin) {\n                status.push('❌ ' + sortedDependencies[i]);\n                continue;\n            }\n\n            if (Plugin.isUsed(module, plugin.name)) {\n                continue;\n            }\n\n            if (!Plugin.isFor(plugin, module)) {\n                Common.warn('Plugin.use:', Plugin.toString(plugin), 'is for', plugin.for, 'but installed on', Plugin.toString(module) + '.');\n                plugin._warned = true;\n            }\n\n            if (plugin.install) {\n                plugin.install(module);\n            } else {\n                Common.warn('Plugin.use:', Plugin.toString(plugin), 'does not specify an install function.');\n                plugin._warned = true;\n            }\n\n            if (plugin._warned) {\n                status.push('🔶 ' + Plugin.toString(plugin));\n                delete plugin._warned;\n            } else {\n                status.push('✅ ' + Plugin.toString(plugin));\n            }\n\n            module.used.push(plugin.name);\n        }\n\n        if (status.length > 0) {\n            Common.info(status.join('  '));\n        }\n    };\n\n    /**\n     * Recursively finds all of a module's dependencies and returns a flat dependency graph.\n     * @method dependencies\n     * @param module {} The module.\n     * @return {object} A dependency graph.\n     */\n    Plugin.dependencies = function(module, tracked) {\n        var parsedBase = Plugin.dependencyParse(module),\n            name = parsedBase.name;\n\n        tracked = tracked || {};\n\n        if (name in tracked) {\n            return;\n        }\n\n        module = Plugin.resolve(module) || module;\n\n        tracked[name] = Common.map(module.uses || [], function(dependency) {\n            if (Plugin.isPlugin(dependency)) {\n                Plugin.register(dependency);\n            }\n\n            var parsed = Plugin.dependencyParse(dependency),\n                resolved = Plugin.resolve(dependency);\n\n            if (resolved && !Plugin.versionSatisfies(resolved.version, parsed.range)) {\n                Common.warn(\n                    'Plugin.dependencies:', Plugin.toString(resolved), 'does not satisfy',\n                    Plugin.toString(parsed), 'used by', Plugin.toString(parsedBase) + '.'\n                );\n\n                resolved._warned = true;\n                module._warned = true;\n            } else if (!resolved) {\n                Common.warn(\n                    'Plugin.dependencies:', Plugin.toString(dependency), 'used by',\n                    Plugin.toString(parsedBase), 'could not be resolved.'\n                );\n\n                module._warned = true;\n            }\n\n            return parsed.name;\n        });\n\n        for (var i = 0; i < tracked[name].length; i += 1) {\n            Plugin.dependencies(tracked[name][i], tracked);\n        }\n\n        return tracked;\n    };\n\n    /**\n     * Parses a dependency string into its components.\n     * The `dependency` is a string of the format `'module-name'` or `'module-name@version'`.\n     * See documentation for `Plugin.versionParse` for a description of the format.\n     * This function can also handle dependencies that are already resolved (e.g. a module object).\n     * @method dependencyParse\n     * @param dependency {string} The dependency of the format `'module-name'` or `'module-name@version'`.\n     * @return {object} The dependency parsed into its components.\n     */\n    Plugin.dependencyParse = function(dependency) {\n        if (Common.isString(dependency)) {\n            var pattern = /^[\\w-]+(@(\\*|[\\^~]?\\d+\\.\\d+\\.\\d+(-[0-9A-Za-z-]+)?))?$/;\n\n            if (!pattern.test(dependency)) {\n                Common.warn('Plugin.dependencyParse:', dependency, 'is not a valid dependency string.');\n            }\n\n            return {\n                name: dependency.split('@')[0],\n                range: dependency.split('@')[1] || '*'\n            };\n        }\n\n        return {\n            name: dependency.name,\n            range: dependency.range || dependency.version\n        };\n    };\n\n    /**\n     * Parses a version string into its components.  \n     * Versions are strictly of the format `x.y.z` (as in [semver](http://semver.org/)).\n     * Versions may optionally have a prerelease tag in the format `x.y.z-alpha`.\n     * Ranges are a strict subset of [npm ranges](https://docs.npmjs.com/misc/semver#advanced-range-syntax).\n     * Only the following range types are supported:\n     * - Tilde ranges e.g. `~1.2.3`\n     * - Caret ranges e.g. `^1.2.3`\n     * - Exact version e.g. `1.2.3`\n     * - Any version `*`\n     * @method versionParse\n     * @param range {string} The version string.\n     * @return {object} The version range parsed into its components.\n     */\n    Plugin.versionParse = function(range) {\n        var pattern = /^\\*|[\\^~]?\\d+\\.\\d+\\.\\d+(-[0-9A-Za-z-]+)?$/;\n\n        if (!pattern.test(range)) {\n            Common.warn('Plugin.versionParse:', range, 'is not a valid version or range.');\n        }\n\n        var identifiers = range.split('-');\n        range = identifiers[0];\n\n        var isRange = isNaN(Number(range[0])),\n            version = isRange ? range.substr(1) : range,\n            parts = Common.map(version.split('.'), function(part) {\n                return Number(part);\n            });\n\n        return {\n            isRange: isRange,\n            version: version,\n            range: range,\n            operator: isRange ? range[0] : '',\n            parts: parts,\n            prerelease: identifiers[1],\n            number: parts[0] * 1e8 + parts[1] * 1e4 + parts[2]\n        };\n    };\n\n    /**\n     * Returns `true` if `version` satisfies the given `range`.\n     * See documentation for `Plugin.versionParse` for a description of the format.\n     * If a version or range is not specified, then any version (`*`) is assumed to satisfy.\n     * @method versionSatisfies\n     * @param version {string} The version string.\n     * @param range {string} The range string.\n     * @return {boolean} `true` if `version` satisfies `range`, otherwise `false`.\n     */\n    Plugin.versionSatisfies = function(version, range) {\n        range = range || '*';\n\n        var rangeParsed = Plugin.versionParse(range),\n            rangeParts = rangeParsed.parts,\n            versionParsed = Plugin.versionParse(version),\n            versionParts = versionParsed.parts;\n\n        if (rangeParsed.isRange) {\n            if (rangeParsed.operator === '*' || version === '*') {\n                return true;\n            }\n\n            if (rangeParsed.operator === '~') {\n                return versionParts[0] === rangeParts[0] && versionParts[1] === rangeParts[1] && versionParts[2] >= rangeParts[2];\n            }\n\n            if (rangeParsed.operator === '^') {\n                if (rangeParts[0] > 0) {\n                    return versionParts[0] === rangeParts[0] && versionParsed.number >= rangeParsed.number;\n                }\n\n                if (rangeParts[1] > 0) {\n                    return versionParts[1] === rangeParts[1] && versionParts[2] >= rangeParts[2];\n                }\n\n                return versionParts[2] === rangeParts[2];\n            }\n        }\n\n        return version === range || version === '*';\n    };\n\n})();\n\n},{\"./Common\":14}],21:[function(_dereq_,module,exports){\n/**\n* The `Matter.Runner` module is an optional utility which provides a game loop, \n* that handles continuously updating a `Matter.Engine` for you within a browser.\n* It is intended for development and debugging purposes, but may also be suitable for simple games.\n* If you are using your own game loop instead, then you do not need the `Matter.Runner` module.\n* Instead just call `Engine.update(engine, delta)` in your own loop.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Runner\n*/\n\nvar Runner = {};\n\nmodule.exports = Runner;\n\nvar Events = _dereq_('./Events');\nvar Engine = _dereq_('./Engine');\nvar Common = _dereq_('./Common');\n\n(function() {\n\n    var _requestAnimationFrame,\n        _cancelAnimationFrame;\n\n    if (typeof window !== 'undefined') {\n        _requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame\n                                      || window.mozRequestAnimationFrame || window.msRequestAnimationFrame;\n   \n        _cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame \n                                      || window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;\n    }\n\n    if (!_requestAnimationFrame) {\n        var _frameTimeout;\n\n        _requestAnimationFrame = function(callback){ \n            _frameTimeout = setTimeout(function() { \n                callback(Common.now()); \n            }, 1000 / 60);\n        };\n\n        _cancelAnimationFrame = function() {\n            clearTimeout(_frameTimeout);\n        };\n    }\n\n    /**\n     * Creates a new Runner. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * @method create\n     * @param {} options\n     */\n    Runner.create = function(options) {\n        var defaults = {\n            fps: 60,\n            correction: 1,\n            deltaSampleSize: 60,\n            counterTimestamp: 0,\n            frameCounter: 0,\n            deltaHistory: [],\n            timePrev: null,\n            timeScalePrev: 1,\n            frameRequestId: null,\n            isFixed: false,\n            enabled: true\n        };\n\n        var runner = Common.extend(defaults, options);\n\n        runner.delta = runner.delta || 1000 / runner.fps;\n        runner.deltaMin = runner.deltaMin || 1000 / runner.fps;\n        runner.deltaMax = runner.deltaMax || 1000 / (runner.fps * 0.5);\n        runner.fps = 1000 / runner.delta;\n\n        return runner;\n    };\n\n    /**\n     * Continuously ticks a `Matter.Engine` by calling `Runner.tick` on the `requestAnimationFrame` event.\n     * @method run\n     * @param {engine} engine\n     */\n    Runner.run = function(runner, engine) {\n        // create runner if engine is first argument\n        if (typeof runner.positionIterations !== 'undefined') {\n            engine = runner;\n            runner = Runner.create();\n        }\n\n        (function render(time){\n            runner.frameRequestId = _requestAnimationFrame(render);\n\n            if (time && runner.enabled) {\n                Runner.tick(runner, engine, time);\n            }\n        })();\n\n        return runner;\n    };\n\n    /**\n     * A game loop utility that updates the engine and renderer by one step (a 'tick').\n     * Features delta smoothing, time correction and fixed or dynamic timing.\n     * Triggers `beforeTick`, `tick` and `afterTick` events on the engine.\n     * Consider just `Engine.update(engine, delta)` if you're using your own loop.\n     * @method tick\n     * @param {runner} runner\n     * @param {engine} engine\n     * @param {number} time\n     */\n    Runner.tick = function(runner, engine, time) {\n        var timing = engine.timing,\n            correction = 1,\n            delta;\n\n        // create an event object\n        var event = {\n            timestamp: timing.timestamp\n        };\n\n        Events.trigger(runner, 'beforeTick', event);\n        Events.trigger(engine, 'beforeTick', event); // @deprecated\n\n        if (runner.isFixed) {\n            // fixed timestep\n            delta = runner.delta;\n        } else {\n            // dynamic timestep based on wall clock between calls\n            delta = (time - runner.timePrev) || runner.delta;\n            runner.timePrev = time;\n\n            // optimistically filter delta over a few frames, to improve stability\n            runner.deltaHistory.push(delta);\n            runner.deltaHistory = runner.deltaHistory.slice(-runner.deltaSampleSize);\n            delta = Math.min.apply(null, runner.deltaHistory);\n            \n            // limit delta\n            delta = delta < runner.deltaMin ? runner.deltaMin : delta;\n            delta = delta > runner.deltaMax ? runner.deltaMax : delta;\n\n            // correction for delta\n            correction = delta / runner.delta;\n\n            // update engine timing object\n            runner.delta = delta;\n        }\n\n        // time correction for time scaling\n        if (runner.timeScalePrev !== 0)\n            correction *= timing.timeScale / runner.timeScalePrev;\n\n        if (timing.timeScale === 0)\n            correction = 0;\n\n        runner.timeScalePrev = timing.timeScale;\n        runner.correction = correction;\n\n        // fps counter\n        runner.frameCounter += 1;\n        if (time - runner.counterTimestamp >= 1000) {\n            runner.fps = runner.frameCounter * ((time - runner.counterTimestamp) / 1000);\n            runner.counterTimestamp = time;\n            runner.frameCounter = 0;\n        }\n\n        Events.trigger(runner, 'tick', event);\n        Events.trigger(engine, 'tick', event); // @deprecated\n\n        // if world has been modified, clear the render scene graph\n        if (engine.world.isModified \n            && engine.render\n            && engine.render.controller\n            && engine.render.controller.clear) {\n            engine.render.controller.clear(engine.render); // @deprecated\n        }\n\n        // update\n        Events.trigger(runner, 'beforeUpdate', event);\n        Engine.update(engine, delta, correction);\n        Events.trigger(runner, 'afterUpdate', event);\n\n        // render\n        // @deprecated\n        if (engine.render && engine.render.controller) {\n            Events.trigger(runner, 'beforeRender', event);\n            Events.trigger(engine, 'beforeRender', event); // @deprecated\n\n            engine.render.controller.world(engine.render);\n\n            Events.trigger(runner, 'afterRender', event);\n            Events.trigger(engine, 'afterRender', event); // @deprecated\n        }\n\n        Events.trigger(runner, 'afterTick', event);\n        Events.trigger(engine, 'afterTick', event); // @deprecated\n    };\n\n    /**\n     * Ends execution of `Runner.run` on the given `runner`, by canceling the animation frame request event loop.\n     * If you wish to only temporarily pause the engine, see `engine.enabled` instead.\n     * @method stop\n     * @param {runner} runner\n     */\n    Runner.stop = function(runner) {\n        _cancelAnimationFrame(runner.frameRequestId);\n    };\n\n    /**\n     * Alias for `Runner.run`.\n     * @method start\n     * @param {runner} runner\n     * @param {engine} engine\n     */\n    Runner.start = function(runner, engine) {\n        Runner.run(runner, engine);\n    };\n\n    /*\n    *\n    *  Events Documentation\n    *\n    */\n\n    /**\n    * Fired at the start of a tick, before any updates to the engine or timing\n    *\n    * @event beforeTick\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after engine timing updated, but just before update\n    *\n    * @event tick\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired at the end of a tick, after engine update and after rendering\n    *\n    * @event afterTick\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired before update\n    *\n    * @event beforeUpdate\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after update\n    *\n    * @event afterUpdate\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired before rendering\n    *\n    * @event beforeRender\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    * @deprecated\n    */\n\n    /**\n    * Fired after rendering\n    *\n    * @event afterRender\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    * @deprecated\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * A flag that specifies whether the runner is running or not.\n     *\n     * @property enabled\n     * @type boolean\n     * @default true\n     */\n\n    /**\n     * A `Boolean` that specifies if the runner should use a fixed timestep (otherwise it is variable).\n     * If timing is fixed, then the apparent simulation speed will change depending on the frame rate (but behaviour will be deterministic).\n     * If the timing is variable, then the apparent simulation speed will be constant (approximately, but at the cost of determininism).\n     *\n     * @property isFixed\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * A `Number` that specifies the time step between updates in milliseconds.\n     * If `engine.timing.isFixed` is set to `true`, then `delta` is fixed.\n     * If it is `false`, then `delta` can dynamically change to maintain the correct apparent simulation speed.\n     *\n     * @property delta\n     * @type number\n     * @default 1000 / 60\n     */\n\n})();\n\n},{\"./Common\":14,\"./Engine\":15,\"./Events\":16}],22:[function(_dereq_,module,exports){\n/**\n* The `Matter.Sleeping` module contains methods to manage the sleeping state of bodies.\n*\n* @class Sleeping\n*/\n\nvar Sleeping = {};\n\nmodule.exports = Sleeping;\n\nvar Events = _dereq_('./Events');\n\n(function() {\n\n    Sleeping._motionWakeThreshold = 0.18;\n    Sleeping._motionSleepThreshold = 0.08;\n    Sleeping._minBias = 0.9;\n\n    /**\n     * Puts bodies to sleep or wakes them up depending on their motion.\n     * @method update\n     * @param {body[]} bodies\n     * @param {number} timeScale\n     */\n    Sleeping.update = function(bodies, timeScale) {\n        var timeFactor = timeScale * timeScale * timeScale;\n\n        // update bodies sleeping status\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                motion = body.speed * body.speed + body.angularSpeed * body.angularSpeed;\n\n            // wake up bodies if they have a force applied\n            if (body.force.x !== 0 || body.force.y !== 0) {\n                Sleeping.set(body, false);\n                continue;\n            }\n\n            var minMotion = Math.min(body.motion, motion),\n                maxMotion = Math.max(body.motion, motion);\n        \n            // biased average motion estimation between frames\n            body.motion = Sleeping._minBias * minMotion + (1 - Sleeping._minBias) * maxMotion;\n            \n            if (body.sleepThreshold > 0 && body.motion < Sleeping._motionSleepThreshold * timeFactor) {\n                body.sleepCounter += 1;\n                \n                if (body.sleepCounter >= body.sleepThreshold)\n                    Sleeping.set(body, true);\n            } else if (body.sleepCounter > 0) {\n                body.sleepCounter -= 1;\n            }\n        }\n    };\n\n    /**\n     * Given a set of colliding pairs, wakes the sleeping bodies involved.\n     * @method afterCollisions\n     * @param {pair[]} pairs\n     * @param {number} timeScale\n     */\n    Sleeping.afterCollisions = function(pairs, timeScale) {\n        var timeFactor = timeScale * timeScale * timeScale;\n\n        // wake up bodies involved in collisions\n        for (var i = 0; i < pairs.length; i++) {\n            var pair = pairs[i];\n            \n            // don't wake inactive pairs\n            if (!pair.isActive)\n                continue;\n\n            var collision = pair.collision,\n                bodyA = collision.bodyA.parent, \n                bodyB = collision.bodyB.parent;\n        \n            // don't wake if at least one body is static\n            if ((bodyA.isSleeping && bodyB.isSleeping) || bodyA.isStatic || bodyB.isStatic)\n                continue;\n        \n            if (bodyA.isSleeping || bodyB.isSleeping) {\n                var sleepingBody = (bodyA.isSleeping && !bodyA.isStatic) ? bodyA : bodyB,\n                    movingBody = sleepingBody === bodyA ? bodyB : bodyA;\n\n                if (!sleepingBody.isStatic && movingBody.motion > Sleeping._motionWakeThreshold * timeFactor) {\n                    Sleeping.set(sleepingBody, false);\n                }\n            }\n        }\n    };\n  \n    /**\n     * Set a body as sleeping or awake.\n     * @method set\n     * @param {body} body\n     * @param {boolean} isSleeping\n     */\n    Sleeping.set = function(body, isSleeping) {\n        var wasSleeping = body.isSleeping;\n\n        if (isSleeping) {\n            body.isSleeping = true;\n            body.sleepCounter = body.sleepThreshold;\n\n            body.positionImpulse.x = 0;\n            body.positionImpulse.y = 0;\n\n            body.positionPrev.x = body.position.x;\n            body.positionPrev.y = body.position.y;\n\n            body.anglePrev = body.angle;\n            body.speed = 0;\n            body.angularSpeed = 0;\n            body.motion = 0;\n\n            if (!wasSleeping) {\n                Events.trigger(body, 'sleepStart');\n            }\n        } else {\n            body.isSleeping = false;\n            body.sleepCounter = 0;\n\n            if (wasSleeping) {\n                Events.trigger(body, 'sleepEnd');\n            }\n        }\n    };\n\n})();\n\n},{\"./Events\":16}],23:[function(_dereq_,module,exports){\n(function (global){\n/**\n* The `Matter.Bodies` module contains factory methods for creating rigid body models \n* with commonly used body configurations (such as rectangles, circles and other polygons).\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Bodies\n*/\n\n// TODO: true circle bodies\n\nvar Bodies = {};\n\nmodule.exports = Bodies;\n\nvar Vertices = _dereq_('../geometry/Vertices');\nvar Common = _dereq_('../core/Common');\nvar Body = _dereq_('../body/Body');\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Vector = _dereq_('../geometry/Vector');\nvar decomp = (typeof window !== \"undefined\" ? window['decomp'] : typeof global !== \"undefined\" ? global['decomp'] : null);\n\n(function() {\n\n    /**\n     * Creates a new rigid body model with a rectangle hull. \n     * The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.\n     * @method rectangle\n     * @param {number} x\n     * @param {number} y\n     * @param {number} width\n     * @param {number} height\n     * @param {object} [options]\n     * @return {body} A new rectangle body\n     */\n    Bodies.rectangle = function(x, y, width, height, options) {\n        options = options || {};\n\n        var rectangle = { \n            label: 'Rectangle Body',\n            position: { x: x, y: y },\n            vertices: Vertices.fromPath('L 0 0 L ' + width + ' 0 L ' + width + ' ' + height + ' L 0 ' + height)\n        };\n\n        if (options.chamfer) {\n            var chamfer = options.chamfer;\n            rectangle.vertices = Vertices.chamfer(rectangle.vertices, chamfer.radius, \n                                    chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);\n            delete options.chamfer;\n        }\n\n        return Body.create(Common.extend({}, rectangle, options));\n    };\n    \n    /**\n     * Creates a new rigid body model with a trapezoid hull. \n     * The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.\n     * @method trapezoid\n     * @param {number} x\n     * @param {number} y\n     * @param {number} width\n     * @param {number} height\n     * @param {number} slope\n     * @param {object} [options]\n     * @return {body} A new trapezoid body\n     */\n    Bodies.trapezoid = function(x, y, width, height, slope, options) {\n        options = options || {};\n\n        slope *= 0.5;\n        var roof = (1 - (slope * 2)) * width;\n        \n        var x1 = width * slope,\n            x2 = x1 + roof,\n            x3 = x2 + x1,\n            verticesPath;\n\n        if (slope < 0.5) {\n            verticesPath = 'L 0 0 L ' + x1 + ' ' + (-height) + ' L ' + x2 + ' ' + (-height) + ' L ' + x3 + ' 0';\n        } else {\n            verticesPath = 'L 0 0 L ' + x2 + ' ' + (-height) + ' L ' + x3 + ' 0';\n        }\n\n        var trapezoid = { \n            label: 'Trapezoid Body',\n            position: { x: x, y: y },\n            vertices: Vertices.fromPath(verticesPath)\n        };\n\n        if (options.chamfer) {\n            var chamfer = options.chamfer;\n            trapezoid.vertices = Vertices.chamfer(trapezoid.vertices, chamfer.radius, \n                                    chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);\n            delete options.chamfer;\n        }\n\n        return Body.create(Common.extend({}, trapezoid, options));\n    };\n\n    /**\n     * Creates a new rigid body model with a circle hull. \n     * The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.\n     * @method circle\n     * @param {number} x\n     * @param {number} y\n     * @param {number} radius\n     * @param {object} [options]\n     * @param {number} [maxSides]\n     * @return {body} A new circle body\n     */\n    Bodies.circle = function(x, y, radius, options, maxSides) {\n        options = options || {};\n\n        var circle = {\n            label: 'Circle Body',\n            circleRadius: radius\n        };\n        \n        // approximate circles with polygons until true circles implemented in SAT\n        maxSides = maxSides || 25;\n        var sides = Math.ceil(Math.max(10, Math.min(maxSides, radius)));\n\n        // optimisation: always use even number of sides (half the number of unique axes)\n        if (sides % 2 === 1)\n            sides += 1;\n\n        return Bodies.polygon(x, y, sides, radius, Common.extend({}, circle, options));\n    };\n\n    /**\n     * Creates a new rigid body model with a regular polygon hull with the given number of sides. \n     * The options parameter is an object that specifies any properties you wish to override the defaults.\n     * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.\n     * @method polygon\n     * @param {number} x\n     * @param {number} y\n     * @param {number} sides\n     * @param {number} radius\n     * @param {object} [options]\n     * @return {body} A new regular polygon body\n     */\n    Bodies.polygon = function(x, y, sides, radius, options) {\n        options = options || {};\n\n        if (sides < 3)\n            return Bodies.circle(x, y, radius, options);\n\n        var theta = 2 * Math.PI / sides,\n            path = '',\n            offset = theta * 0.5;\n\n        for (var i = 0; i < sides; i += 1) {\n            var angle = offset + (i * theta),\n                xx = Math.cos(angle) * radius,\n                yy = Math.sin(angle) * radius;\n\n            path += 'L ' + xx.toFixed(3) + ' ' + yy.toFixed(3) + ' ';\n        }\n\n        var polygon = { \n            label: 'Polygon Body',\n            position: { x: x, y: y },\n            vertices: Vertices.fromPath(path)\n        };\n\n        if (options.chamfer) {\n            var chamfer = options.chamfer;\n            polygon.vertices = Vertices.chamfer(polygon.vertices, chamfer.radius, \n                                    chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);\n            delete options.chamfer;\n        }\n\n        return Body.create(Common.extend({}, polygon, options));\n    };\n\n    /**\n     * Creates a body using the supplied vertices (or an array containing multiple sets of vertices).\n     * If the vertices are convex, they will pass through as supplied.\n     * Otherwise if the vertices are concave, they will be decomposed if [poly-decomp.js](https://github.com/schteppe/poly-decomp.js) is available.\n     * Note that this process is not guaranteed to support complex sets of vertices (e.g. those with holes may fail).\n     * By default the decomposition will discard collinear edges (to improve performance).\n     * It can also optionally discard any parts that have an area less than `minimumArea`.\n     * If the vertices can not be decomposed, the result will fall back to using the convex hull.\n     * The options parameter is an object that specifies any `Matter.Body` properties you wish to override the defaults.\n     * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.\n     * @method fromVertices\n     * @param {number} x\n     * @param {number} y\n     * @param [[vector]] vertexSets\n     * @param {object} [options]\n     * @param {bool} [flagInternal=false]\n     * @param {number} [removeCollinear=0.01]\n     * @param {number} [minimumArea=10]\n     * @return {body}\n     */\n    Bodies.fromVertices = function(x, y, vertexSets, options, flagInternal, removeCollinear, minimumArea) {\n        var body,\n            parts,\n            isConvex,\n            vertices,\n            i,\n            j,\n            k,\n            v,\n            z;\n\n        options = options || {};\n        parts = [];\n\n        flagInternal = typeof flagInternal !== 'undefined' ? flagInternal : false;\n        removeCollinear = typeof removeCollinear !== 'undefined' ? removeCollinear : 0.01;\n        minimumArea = typeof minimumArea !== 'undefined' ? minimumArea : 10;\n\n        if (!decomp) {\n            Common.warn('Bodies.fromVertices: poly-decomp.js required. Could not decompose vertices. Fallback to convex hull.');\n        }\n\n        // ensure vertexSets is an array of arrays\n        if (!Common.isArray(vertexSets[0])) {\n            vertexSets = [vertexSets];\n        }\n\n        for (v = 0; v < vertexSets.length; v += 1) {\n            vertices = vertexSets[v];\n            isConvex = Vertices.isConvex(vertices);\n\n            if (isConvex || !decomp) {\n                if (isConvex) {\n                    vertices = Vertices.clockwiseSort(vertices);\n                } else {\n                    // fallback to convex hull when decomposition is not possible\n                    vertices = Vertices.hull(vertices);\n                }\n\n                parts.push({\n                    position: { x: x, y: y },\n                    vertices: vertices\n                });\n            } else {\n                // initialise a decomposition\n                var concave = vertices.map(function(vertex) {\n                    return [vertex.x, vertex.y];\n                });\n\n                // vertices are concave and simple, we can decompose into parts\n                decomp.makeCCW(concave);\n                if (removeCollinear !== false)\n                    decomp.removeCollinearPoints(concave, removeCollinear);\n\n                // use the quick decomposition algorithm (Bayazit)\n                var decomposed = decomp.quickDecomp(concave);\n\n                // for each decomposed chunk\n                for (i = 0; i < decomposed.length; i++) {\n                    var chunk = decomposed[i];\n\n                    // convert vertices into the correct structure\n                    var chunkVertices = chunk.map(function(vertices) {\n                        return {\n                            x: vertices[0],\n                            y: vertices[1]\n                        };\n                    });\n\n                    // skip small chunks\n                    if (minimumArea > 0 && Vertices.area(chunkVertices) < minimumArea)\n                        continue;\n\n                    // create a compound part\n                    parts.push({\n                        position: Vertices.centre(chunkVertices),\n                        vertices: chunkVertices\n                    });\n                }\n            }\n        }\n\n        // create body parts\n        for (i = 0; i < parts.length; i++) {\n            parts[i] = Body.create(Common.extend(parts[i], options));\n        }\n\n        // flag internal edges (coincident part edges)\n        if (flagInternal) {\n            var coincident_max_dist = 5;\n\n            for (i = 0; i < parts.length; i++) {\n                var partA = parts[i];\n\n                for (j = i + 1; j < parts.length; j++) {\n                    var partB = parts[j];\n\n                    if (Bounds.overlaps(partA.bounds, partB.bounds)) {\n                        var pav = partA.vertices,\n                            pbv = partB.vertices;\n\n                        // iterate vertices of both parts\n                        for (k = 0; k < partA.vertices.length; k++) {\n                            for (z = 0; z < partB.vertices.length; z++) {\n                                // find distances between the vertices\n                                var da = Vector.magnitudeSquared(Vector.sub(pav[(k + 1) % pav.length], pbv[z])),\n                                    db = Vector.magnitudeSquared(Vector.sub(pav[k], pbv[(z + 1) % pbv.length]));\n\n                                // if both vertices are very close, consider the edge concident (internal)\n                                if (da < coincident_max_dist && db < coincident_max_dist) {\n                                    pav[k].isInternal = true;\n                                    pbv[z].isInternal = true;\n                                }\n                            }\n                        }\n\n                    }\n                }\n            }\n        }\n\n        if (parts.length > 1) {\n            // create the parent body to be returned, that contains generated compound parts\n            body = Body.create(Common.extend({ parts: parts.slice(0) }, options));\n            Body.setPosition(body, { x: x, y: y });\n\n            return body;\n        } else {\n            return parts[0];\n        }\n    };\n\n})();\n\n}).call(this,typeof global !== \"undefined\" ? global : typeof self !== \"undefined\" ? self : typeof window !== \"undefined\" ? window : {})\n},{\"../body/Body\":1,\"../core/Common\":14,\"../geometry/Bounds\":26,\"../geometry/Vector\":28,\"../geometry/Vertices\":29}],24:[function(_dereq_,module,exports){\n/**\n* The `Matter.Composites` module contains factory methods for creating composite bodies\n* with commonly used configurations (such as stacks and chains).\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Composites\n*/\n\nvar Composites = {};\n\nmodule.exports = Composites;\n\nvar Composite = _dereq_('../body/Composite');\nvar Constraint = _dereq_('../constraint/Constraint');\nvar Common = _dereq_('../core/Common');\nvar Body = _dereq_('../body/Body');\nvar Bodies = _dereq_('./Bodies');\n\n(function() {\n\n    /**\n     * Create a new composite containing bodies created in the callback in a grid arrangement.\n     * This function uses the body's bounds to prevent overlaps.\n     * @method stack\n     * @param {number} xx\n     * @param {number} yy\n     * @param {number} columns\n     * @param {number} rows\n     * @param {number} columnGap\n     * @param {number} rowGap\n     * @param {function} callback\n     * @return {composite} A new composite containing objects created in the callback\n     */\n    Composites.stack = function(xx, yy, columns, rows, columnGap, rowGap, callback) {\n        var stack = Composite.create({ label: 'Stack' }),\n            x = xx,\n            y = yy,\n            lastBody,\n            i = 0;\n\n        for (var row = 0; row < rows; row++) {\n            var maxHeight = 0;\n            \n            for (var column = 0; column < columns; column++) {\n                var body = callback(x, y, column, row, lastBody, i);\n                    \n                if (body) {\n                    var bodyHeight = body.bounds.max.y - body.bounds.min.y,\n                        bodyWidth = body.bounds.max.x - body.bounds.min.x; \n\n                    if (bodyHeight > maxHeight)\n                        maxHeight = bodyHeight;\n                    \n                    Body.translate(body, { x: bodyWidth * 0.5, y: bodyHeight * 0.5 });\n\n                    x = body.bounds.max.x + columnGap;\n\n                    Composite.addBody(stack, body);\n                    \n                    lastBody = body;\n                    i += 1;\n                } else {\n                    x += columnGap;\n                }\n            }\n            \n            y += maxHeight + rowGap;\n            x = xx;\n        }\n\n        return stack;\n    };\n    \n    /**\n     * Chains all bodies in the given composite together using constraints.\n     * @method chain\n     * @param {composite} composite\n     * @param {number} xOffsetA\n     * @param {number} yOffsetA\n     * @param {number} xOffsetB\n     * @param {number} yOffsetB\n     * @param {object} options\n     * @return {composite} A new composite containing objects chained together with constraints\n     */\n    Composites.chain = function(composite, xOffsetA, yOffsetA, xOffsetB, yOffsetB, options) {\n        var bodies = composite.bodies;\n        \n        for (var i = 1; i < bodies.length; i++) {\n            var bodyA = bodies[i - 1],\n                bodyB = bodies[i],\n                bodyAHeight = bodyA.bounds.max.y - bodyA.bounds.min.y,\n                bodyAWidth = bodyA.bounds.max.x - bodyA.bounds.min.x, \n                bodyBHeight = bodyB.bounds.max.y - bodyB.bounds.min.y,\n                bodyBWidth = bodyB.bounds.max.x - bodyB.bounds.min.x;\n        \n            var defaults = {\n                bodyA: bodyA,\n                pointA: { x: bodyAWidth * xOffsetA, y: bodyAHeight * yOffsetA },\n                bodyB: bodyB,\n                pointB: { x: bodyBWidth * xOffsetB, y: bodyBHeight * yOffsetB }\n            };\n            \n            var constraint = Common.extend(defaults, options);\n        \n            Composite.addConstraint(composite, Constraint.create(constraint));\n        }\n\n        composite.label += ' Chain';\n        \n        return composite;\n    };\n\n    /**\n     * Connects bodies in the composite with constraints in a grid pattern, with optional cross braces.\n     * @method mesh\n     * @param {composite} composite\n     * @param {number} columns\n     * @param {number} rows\n     * @param {boolean} crossBrace\n     * @param {object} options\n     * @return {composite} The composite containing objects meshed together with constraints\n     */\n    Composites.mesh = function(composite, columns, rows, crossBrace, options) {\n        var bodies = composite.bodies,\n            row,\n            col,\n            bodyA,\n            bodyB,\n            bodyC;\n        \n        for (row = 0; row < rows; row++) {\n            for (col = 1; col < columns; col++) {\n                bodyA = bodies[(col - 1) + (row * columns)];\n                bodyB = bodies[col + (row * columns)];\n                Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyA, bodyB: bodyB }, options)));\n            }\n\n            if (row > 0) {\n                for (col = 0; col < columns; col++) {\n                    bodyA = bodies[col + ((row - 1) * columns)];\n                    bodyB = bodies[col + (row * columns)];\n                    Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyA, bodyB: bodyB }, options)));\n\n                    if (crossBrace && col > 0) {\n                        bodyC = bodies[(col - 1) + ((row - 1) * columns)];\n                        Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyC, bodyB: bodyB }, options)));\n                    }\n\n                    if (crossBrace && col < columns - 1) {\n                        bodyC = bodies[(col + 1) + ((row - 1) * columns)];\n                        Composite.addConstraint(composite, Constraint.create(Common.extend({ bodyA: bodyC, bodyB: bodyB }, options)));\n                    }\n                }\n            }\n        }\n\n        composite.label += ' Mesh';\n        \n        return composite;\n    };\n    \n    /**\n     * Create a new composite containing bodies created in the callback in a pyramid arrangement.\n     * This function uses the body's bounds to prevent overlaps.\n     * @method pyramid\n     * @param {number} xx\n     * @param {number} yy\n     * @param {number} columns\n     * @param {number} rows\n     * @param {number} columnGap\n     * @param {number} rowGap\n     * @param {function} callback\n     * @return {composite} A new composite containing objects created in the callback\n     */\n    Composites.pyramid = function(xx, yy, columns, rows, columnGap, rowGap, callback) {\n        return Composites.stack(xx, yy, columns, rows, columnGap, rowGap, function(x, y, column, row, lastBody, i) {\n            var actualRows = Math.min(rows, Math.ceil(columns / 2)),\n                lastBodyWidth = lastBody ? lastBody.bounds.max.x - lastBody.bounds.min.x : 0;\n            \n            if (row > actualRows)\n                return;\n            \n            // reverse row order\n            row = actualRows - row;\n            \n            var start = row,\n                end = columns - 1 - row;\n\n            if (column < start || column > end)\n                return;\n            \n            // retroactively fix the first body's position, since width was unknown\n            if (i === 1) {\n                Body.translate(lastBody, { x: (column + (columns % 2 === 1 ? 1 : -1)) * lastBodyWidth, y: 0 });\n            }\n\n            var xOffset = lastBody ? column * lastBodyWidth : 0;\n            \n            return callback(xx + xOffset + column * columnGap, y, column, row, lastBody, i);\n        });\n    };\n\n    /**\n     * Creates a composite with a Newton's Cradle setup of bodies and constraints.\n     * @method newtonsCradle\n     * @param {number} xx\n     * @param {number} yy\n     * @param {number} number\n     * @param {number} size\n     * @param {number} length\n     * @return {composite} A new composite newtonsCradle body\n     */\n    Composites.newtonsCradle = function(xx, yy, number, size, length) {\n        var newtonsCradle = Composite.create({ label: 'Newtons Cradle' });\n\n        for (var i = 0; i < number; i++) {\n            var separation = 1.9,\n                circle = Bodies.circle(xx + i * (size * separation), yy + length, size, \n                            { inertia: Infinity, restitution: 1, friction: 0, frictionAir: 0.0001, slop: 1 }),\n                constraint = Constraint.create({ pointA: { x: xx + i * (size * separation), y: yy }, bodyB: circle });\n\n            Composite.addBody(newtonsCradle, circle);\n            Composite.addConstraint(newtonsCradle, constraint);\n        }\n\n        return newtonsCradle;\n    };\n    \n    /**\n     * Creates a composite with simple car setup of bodies and constraints.\n     * @method car\n     * @param {number} xx\n     * @param {number} yy\n     * @param {number} width\n     * @param {number} height\n     * @param {number} wheelSize\n     * @return {composite} A new composite car body\n     */\n    Composites.car = function(xx, yy, width, height, wheelSize) {\n        var group = Body.nextGroup(true),\n            wheelBase = 20,\n            wheelAOffset = -width * 0.5 + wheelBase,\n            wheelBOffset = width * 0.5 - wheelBase,\n            wheelYOffset = 0;\n    \n        var car = Composite.create({ label: 'Car' }),\n            body = Bodies.rectangle(xx, yy, width, height, { \n                collisionFilter: {\n                    group: group\n                },\n                chamfer: {\n                    radius: height * 0.5\n                },\n                density: 0.0002\n            });\n    \n        var wheelA = Bodies.circle(xx + wheelAOffset, yy + wheelYOffset, wheelSize, { \n            collisionFilter: {\n                group: group\n            },\n            friction: 0.8\n        });\n                    \n        var wheelB = Bodies.circle(xx + wheelBOffset, yy + wheelYOffset, wheelSize, { \n            collisionFilter: {\n                group: group\n            },\n            friction: 0.8\n        });\n                    \n        var axelA = Constraint.create({\n            bodyB: body,\n            pointB: { x: wheelAOffset, y: wheelYOffset },\n            bodyA: wheelA,\n            stiffness: 1,\n            length: 0\n        });\n                        \n        var axelB = Constraint.create({\n            bodyB: body,\n            pointB: { x: wheelBOffset, y: wheelYOffset },\n            bodyA: wheelB,\n            stiffness: 1,\n            length: 0\n        });\n        \n        Composite.addBody(car, body);\n        Composite.addBody(car, wheelA);\n        Composite.addBody(car, wheelB);\n        Composite.addConstraint(car, axelA);\n        Composite.addConstraint(car, axelB);\n\n        return car;\n    };\n\n    /**\n     * Creates a simple soft body like object.\n     * @method softBody\n     * @param {number} xx\n     * @param {number} yy\n     * @param {number} columns\n     * @param {number} rows\n     * @param {number} columnGap\n     * @param {number} rowGap\n     * @param {boolean} crossBrace\n     * @param {number} particleRadius\n     * @param {} particleOptions\n     * @param {} constraintOptions\n     * @return {composite} A new composite softBody\n     */\n    Composites.softBody = function(xx, yy, columns, rows, columnGap, rowGap, crossBrace, particleRadius, particleOptions, constraintOptions) {\n        particleOptions = Common.extend({ inertia: Infinity }, particleOptions);\n        constraintOptions = Common.extend({ stiffness: 0.2, render: { type: 'line', anchors: false } }, constraintOptions);\n\n        var softBody = Composites.stack(xx, yy, columns, rows, columnGap, rowGap, function(x, y) {\n            return Bodies.circle(x, y, particleRadius, particleOptions);\n        });\n\n        Composites.mesh(softBody, columns, rows, crossBrace, constraintOptions);\n\n        softBody.label = 'Soft Body';\n\n        return softBody;\n    };\n\n})();\n\n},{\"../body/Body\":1,\"../body/Composite\":2,\"../constraint/Constraint\":12,\"../core/Common\":14,\"./Bodies\":23}],25:[function(_dereq_,module,exports){\n/**\n* The `Matter.Axes` module contains methods for creating and manipulating sets of axes.\n*\n* @class Axes\n*/\n\nvar Axes = {};\n\nmodule.exports = Axes;\n\nvar Vector = _dereq_('../geometry/Vector');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    /**\n     * Creates a new set of axes from the given vertices.\n     * @method fromVertices\n     * @param {vertices} vertices\n     * @return {axes} A new axes from the given vertices\n     */\n    Axes.fromVertices = function(vertices) {\n        var axes = {};\n\n        // find the unique axes, using edge normal gradients\n        for (var i = 0; i < vertices.length; i++) {\n            var j = (i + 1) % vertices.length, \n                normal = Vector.normalise({ \n                    x: vertices[j].y - vertices[i].y, \n                    y: vertices[i].x - vertices[j].x\n                }),\n                gradient = (normal.y === 0) ? Infinity : (normal.x / normal.y);\n            \n            // limit precision\n            gradient = gradient.toFixed(3).toString();\n            axes[gradient] = normal;\n        }\n\n        return Common.values(axes);\n    };\n\n    /**\n     * Rotates a set of axes by the given angle.\n     * @method rotate\n     * @param {axes} axes\n     * @param {number} angle\n     */\n    Axes.rotate = function(axes, angle) {\n        if (angle === 0)\n            return;\n        \n        var cos = Math.cos(angle),\n            sin = Math.sin(angle);\n\n        for (var i = 0; i < axes.length; i++) {\n            var axis = axes[i],\n                xx;\n            xx = axis.x * cos - axis.y * sin;\n            axis.y = axis.x * sin + axis.y * cos;\n            axis.x = xx;\n        }\n    };\n\n})();\n\n},{\"../core/Common\":14,\"../geometry/Vector\":28}],26:[function(_dereq_,module,exports){\n/**\n* The `Matter.Bounds` module contains methods for creating and manipulating axis-aligned bounding boxes (AABB).\n*\n* @class Bounds\n*/\n\nvar Bounds = {};\n\nmodule.exports = Bounds;\n\n(function() {\n\n    /**\n     * Creates a new axis-aligned bounding box (AABB) for the given vertices.\n     * @method create\n     * @param {vertices} vertices\n     * @return {bounds} A new bounds object\n     */\n    Bounds.create = function(vertices) {\n        var bounds = { \n            min: { x: 0, y: 0 }, \n            max: { x: 0, y: 0 }\n        };\n\n        if (vertices)\n            Bounds.update(bounds, vertices);\n        \n        return bounds;\n    };\n\n    /**\n     * Updates bounds using the given vertices and extends the bounds given a velocity.\n     * @method update\n     * @param {bounds} bounds\n     * @param {vertices} vertices\n     * @param {vector} velocity\n     */\n    Bounds.update = function(bounds, vertices, velocity) {\n        bounds.min.x = Infinity;\n        bounds.max.x = -Infinity;\n        bounds.min.y = Infinity;\n        bounds.max.y = -Infinity;\n\n        for (var i = 0; i < vertices.length; i++) {\n            var vertex = vertices[i];\n            if (vertex.x > bounds.max.x) bounds.max.x = vertex.x;\n            if (vertex.x < bounds.min.x) bounds.min.x = vertex.x;\n            if (vertex.y > bounds.max.y) bounds.max.y = vertex.y;\n            if (vertex.y < bounds.min.y) bounds.min.y = vertex.y;\n        }\n        \n        if (velocity) {\n            if (velocity.x > 0) {\n                bounds.max.x += velocity.x;\n            } else {\n                bounds.min.x += velocity.x;\n            }\n            \n            if (velocity.y > 0) {\n                bounds.max.y += velocity.y;\n            } else {\n                bounds.min.y += velocity.y;\n            }\n        }\n    };\n\n    /**\n     * Returns true if the bounds contains the given point.\n     * @method contains\n     * @param {bounds} bounds\n     * @param {vector} point\n     * @return {boolean} True if the bounds contain the point, otherwise false\n     */\n    Bounds.contains = function(bounds, point) {\n        return point.x >= bounds.min.x && point.x <= bounds.max.x \n               && point.y >= bounds.min.y && point.y <= bounds.max.y;\n    };\n\n    /**\n     * Returns true if the two bounds intersect.\n     * @method overlaps\n     * @param {bounds} boundsA\n     * @param {bounds} boundsB\n     * @return {boolean} True if the bounds overlap, otherwise false\n     */\n    Bounds.overlaps = function(boundsA, boundsB) {\n        return (boundsA.min.x <= boundsB.max.x && boundsA.max.x >= boundsB.min.x\n                && boundsA.max.y >= boundsB.min.y && boundsA.min.y <= boundsB.max.y);\n    };\n\n    /**\n     * Translates the bounds by the given vector.\n     * @method translate\n     * @param {bounds} bounds\n     * @param {vector} vector\n     */\n    Bounds.translate = function(bounds, vector) {\n        bounds.min.x += vector.x;\n        bounds.max.x += vector.x;\n        bounds.min.y += vector.y;\n        bounds.max.y += vector.y;\n    };\n\n    /**\n     * Shifts the bounds to the given position.\n     * @method shift\n     * @param {bounds} bounds\n     * @param {vector} position\n     */\n    Bounds.shift = function(bounds, position) {\n        var deltaX = bounds.max.x - bounds.min.x,\n            deltaY = bounds.max.y - bounds.min.y;\n            \n        bounds.min.x = position.x;\n        bounds.max.x = position.x + deltaX;\n        bounds.min.y = position.y;\n        bounds.max.y = position.y + deltaY;\n    };\n    \n})();\n\n},{}],27:[function(_dereq_,module,exports){\n/**\n* The `Matter.Svg` module contains methods for converting SVG images into an array of vector points.\n*\n* To use this module you also need the SVGPathSeg polyfill: https://github.com/progers/pathseg\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Svg\n*/\n\nvar Svg = {};\n\nmodule.exports = Svg;\n\nvar Bounds = _dereq_('../geometry/Bounds');\n\n(function() {\n\n    /**\n     * Converts an SVG path into an array of vector points.\n     * If the input path forms a concave shape, you must decompose the result into convex parts before use.\n     * See `Bodies.fromVertices` which provides support for this.\n     * Note that this function is not guaranteed to support complex paths (such as those with holes).\n     * @method pathToVertices\n     * @param {SVGPathElement} path\n     * @param {Number} [sampleLength=15]\n     * @return {Vector[]} points\n     */\n    Svg.pathToVertices = function(path, sampleLength) {\n        // https://github.com/wout/svg.topoly.js/blob/master/svg.topoly.js\n        var i, il, total, point, segment, segments, \n            segmentsQueue, lastSegment, \n            lastPoint, segmentIndex, points = [],\n            lx, ly, length = 0, x = 0, y = 0;\n\n        sampleLength = sampleLength || 15;\n\n        var addPoint = function(px, py, pathSegType) {\n            // all odd-numbered path types are relative except PATHSEG_CLOSEPATH (1)\n            var isRelative = pathSegType % 2 === 1 && pathSegType > 1;\n\n            // when the last point doesn't equal the current point add the current point\n            if (!lastPoint || px != lastPoint.x || py != lastPoint.y) {\n                if (lastPoint && isRelative) {\n                    lx = lastPoint.x;\n                    ly = lastPoint.y;\n                } else {\n                    lx = 0;\n                    ly = 0;\n                }\n\n                var point = {\n                    x: lx + px,\n                    y: ly + py\n                };\n\n                // set last point\n                if (isRelative || !lastPoint) {\n                    lastPoint = point;\n                }\n\n                points.push(point);\n\n                x = lx + px;\n                y = ly + py;\n            }\n        };\n\n        var addSegmentPoint = function(segment) {\n            var segType = segment.pathSegTypeAsLetter.toUpperCase();\n\n            // skip path ends\n            if (segType === 'Z') \n                return;\n\n            // map segment to x and y\n            switch (segType) {\n\n            case 'M':\n            case 'L':\n            case 'T':\n            case 'C':\n            case 'S':\n            case 'Q':\n                x = segment.x;\n                y = segment.y;\n                break;\n            case 'H':\n                x = segment.x;\n                break;\n            case 'V':\n                y = segment.y;\n                break;\n            }\n\n            addPoint(x, y, segment.pathSegType);\n        };\n\n        // ensure path is absolute\n        _svgPathToAbsolute(path);\n\n        // get total length\n        total = path.getTotalLength();\n\n        // queue segments\n        segments = [];\n        for (i = 0; i < path.pathSegList.numberOfItems; i += 1)\n            segments.push(path.pathSegList.getItem(i));\n\n        segmentsQueue = segments.concat();\n\n        // sample through path\n        while (length < total) {\n            // get segment at position\n            segmentIndex = path.getPathSegAtLength(length);\n            segment = segments[segmentIndex];\n\n            // new segment\n            if (segment != lastSegment) {\n                while (segmentsQueue.length && segmentsQueue[0] != segment)\n                    addSegmentPoint(segmentsQueue.shift());\n\n                lastSegment = segment;\n            }\n\n            // add points in between when curving\n            // TODO: adaptive sampling\n            switch (segment.pathSegTypeAsLetter.toUpperCase()) {\n\n            case 'C':\n            case 'T':\n            case 'S':\n            case 'Q':\n            case 'A':\n                point = path.getPointAtLength(length);\n                addPoint(point.x, point.y, 0);\n                break;\n\n            }\n\n            // increment by sample value\n            length += sampleLength;\n        }\n\n        // add remaining segments not passed by sampling\n        for (i = 0, il = segmentsQueue.length; i < il; ++i)\n            addSegmentPoint(segmentsQueue[i]);\n\n        return points;\n    };\n\n    var _svgPathToAbsolute = function(path) {\n        // http://phrogz.net/convert-svg-path-to-all-absolute-commands\n        // Copyright (c) Gavin Kistner\n        // http://phrogz.net/js/_ReuseLicense.txt\n        // Modifications: tidy formatting and naming\n        var x0, y0, x1, y1, x2, y2, segs = path.pathSegList,\n            x = 0, y = 0, len = segs.numberOfItems;\n\n        for (var i = 0; i < len; ++i) {\n            var seg = segs.getItem(i),\n                segType = seg.pathSegTypeAsLetter;\n\n            if (/[MLHVCSQTA]/.test(segType)) {\n                if ('x' in seg) x = seg.x;\n                if ('y' in seg) y = seg.y;\n            } else {\n                if ('x1' in seg) x1 = x + seg.x1;\n                if ('x2' in seg) x2 = x + seg.x2;\n                if ('y1' in seg) y1 = y + seg.y1;\n                if ('y2' in seg) y2 = y + seg.y2;\n                if ('x' in seg) x += seg.x;\n                if ('y' in seg) y += seg.y;\n\n                switch (segType) {\n\n                case 'm':\n                    segs.replaceItem(path.createSVGPathSegMovetoAbs(x, y), i);\n                    break;\n                case 'l':\n                    segs.replaceItem(path.createSVGPathSegLinetoAbs(x, y), i);\n                    break;\n                case 'h':\n                    segs.replaceItem(path.createSVGPathSegLinetoHorizontalAbs(x), i);\n                    break;\n                case 'v':\n                    segs.replaceItem(path.createSVGPathSegLinetoVerticalAbs(y), i);\n                    break;\n                case 'c':\n                    segs.replaceItem(path.createSVGPathSegCurvetoCubicAbs(x, y, x1, y1, x2, y2), i);\n                    break;\n                case 's':\n                    segs.replaceItem(path.createSVGPathSegCurvetoCubicSmoothAbs(x, y, x2, y2), i);\n                    break;\n                case 'q':\n                    segs.replaceItem(path.createSVGPathSegCurvetoQuadraticAbs(x, y, x1, y1), i);\n                    break;\n                case 't':\n                    segs.replaceItem(path.createSVGPathSegCurvetoQuadraticSmoothAbs(x, y), i);\n                    break;\n                case 'a':\n                    segs.replaceItem(path.createSVGPathSegArcAbs(x, y, seg.r1, seg.r2, seg.angle, seg.largeArcFlag, seg.sweepFlag), i);\n                    break;\n                case 'z':\n                case 'Z':\n                    x = x0;\n                    y = y0;\n                    break;\n\n                }\n            }\n\n            if (segType == 'M' || segType == 'm') {\n                x0 = x;\n                y0 = y;\n            }\n        }\n    };\n\n})();\n},{\"../geometry/Bounds\":26}],28:[function(_dereq_,module,exports){\n/**\n* The `Matter.Vector` module contains methods for creating and manipulating vectors.\n* Vectors are the basis of all the geometry related operations in the engine.\n* A `Matter.Vector` object is of the form `{ x: 0, y: 0 }`.\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Vector\n*/\n\n// TODO: consider params for reusing vector objects\n\nvar Vector = {};\n\nmodule.exports = Vector;\n\n(function() {\n\n    /**\n     * Creates a new vector.\n     * @method create\n     * @param {number} x\n     * @param {number} y\n     * @return {vector} A new vector\n     */\n    Vector.create = function(x, y) {\n        return { x: x || 0, y: y || 0 };\n    };\n\n    /**\n     * Returns a new vector with `x` and `y` copied from the given `vector`.\n     * @method clone\n     * @param {vector} vector\n     * @return {vector} A new cloned vector\n     */\n    Vector.clone = function(vector) {\n        return { x: vector.x, y: vector.y };\n    };\n\n    /**\n     * Returns the magnitude (length) of a vector.\n     * @method magnitude\n     * @param {vector} vector\n     * @return {number} The magnitude of the vector\n     */\n    Vector.magnitude = function(vector) {\n        return Math.sqrt((vector.x * vector.x) + (vector.y * vector.y));\n    };\n\n    /**\n     * Returns the magnitude (length) of a vector (therefore saving a `sqrt` operation).\n     * @method magnitudeSquared\n     * @param {vector} vector\n     * @return {number} The squared magnitude of the vector\n     */\n    Vector.magnitudeSquared = function(vector) {\n        return (vector.x * vector.x) + (vector.y * vector.y);\n    };\n\n    /**\n     * Rotates the vector about (0, 0) by specified angle.\n     * @method rotate\n     * @param {vector} vector\n     * @param {number} angle\n     * @param {vector} [output]\n     * @return {vector} The vector rotated about (0, 0)\n     */\n    Vector.rotate = function(vector, angle, output) {\n        var cos = Math.cos(angle), sin = Math.sin(angle);\n        if (!output) output = {};\n        var x = vector.x * cos - vector.y * sin;\n        output.y = vector.x * sin + vector.y * cos;\n        output.x = x;\n        return output;\n    };\n\n    /**\n     * Rotates the vector about a specified point by specified angle.\n     * @method rotateAbout\n     * @param {vector} vector\n     * @param {number} angle\n     * @param {vector} point\n     * @param {vector} [output]\n     * @return {vector} A new vector rotated about the point\n     */\n    Vector.rotateAbout = function(vector, angle, point, output) {\n        var cos = Math.cos(angle), sin = Math.sin(angle);\n        if (!output) output = {};\n        var x = point.x + ((vector.x - point.x) * cos - (vector.y - point.y) * sin);\n        output.y = point.y + ((vector.x - point.x) * sin + (vector.y - point.y) * cos);\n        output.x = x;\n        return output;\n    };\n\n    /**\n     * Normalises a vector (such that its magnitude is `1`).\n     * @method normalise\n     * @param {vector} vector\n     * @return {vector} A new vector normalised\n     */\n    Vector.normalise = function(vector) {\n        var magnitude = Vector.magnitude(vector);\n        if (magnitude === 0)\n            return { x: 0, y: 0 };\n        return { x: vector.x / magnitude, y: vector.y / magnitude };\n    };\n\n    /**\n     * Returns the dot-product of two vectors.\n     * @method dot\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @return {number} The dot product of the two vectors\n     */\n    Vector.dot = function(vectorA, vectorB) {\n        return (vectorA.x * vectorB.x) + (vectorA.y * vectorB.y);\n    };\n\n    /**\n     * Returns the cross-product of two vectors.\n     * @method cross\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @return {number} The cross product of the two vectors\n     */\n    Vector.cross = function(vectorA, vectorB) {\n        return (vectorA.x * vectorB.y) - (vectorA.y * vectorB.x);\n    };\n\n    /**\n     * Returns the cross-product of three vectors.\n     * @method cross3\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @param {vector} vectorC\n     * @return {number} The cross product of the three vectors\n     */\n    Vector.cross3 = function(vectorA, vectorB, vectorC) {\n        return (vectorB.x - vectorA.x) * (vectorC.y - vectorA.y) - (vectorB.y - vectorA.y) * (vectorC.x - vectorA.x);\n    };\n\n    /**\n     * Adds the two vectors.\n     * @method add\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @param {vector} [output]\n     * @return {vector} A new vector of vectorA and vectorB added\n     */\n    Vector.add = function(vectorA, vectorB, output) {\n        if (!output) output = {};\n        output.x = vectorA.x + vectorB.x;\n        output.y = vectorA.y + vectorB.y;\n        return output;\n    };\n\n    /**\n     * Subtracts the two vectors.\n     * @method sub\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @param {vector} [output]\n     * @return {vector} A new vector of vectorA and vectorB subtracted\n     */\n    Vector.sub = function(vectorA, vectorB, output) {\n        if (!output) output = {};\n        output.x = vectorA.x - vectorB.x;\n        output.y = vectorA.y - vectorB.y;\n        return output;\n    };\n\n    /**\n     * Multiplies a vector and a scalar.\n     * @method mult\n     * @param {vector} vector\n     * @param {number} scalar\n     * @return {vector} A new vector multiplied by scalar\n     */\n    Vector.mult = function(vector, scalar) {\n        return { x: vector.x * scalar, y: vector.y * scalar };\n    };\n\n    /**\n     * Divides a vector and a scalar.\n     * @method div\n     * @param {vector} vector\n     * @param {number} scalar\n     * @return {vector} A new vector divided by scalar\n     */\n    Vector.div = function(vector, scalar) {\n        return { x: vector.x / scalar, y: vector.y / scalar };\n    };\n\n    /**\n     * Returns the perpendicular vector. Set `negate` to true for the perpendicular in the opposite direction.\n     * @method perp\n     * @param {vector} vector\n     * @param {bool} [negate=false]\n     * @return {vector} The perpendicular vector\n     */\n    Vector.perp = function(vector, negate) {\n        negate = negate === true ? -1 : 1;\n        return { x: negate * -vector.y, y: negate * vector.x };\n    };\n\n    /**\n     * Negates both components of a vector such that it points in the opposite direction.\n     * @method neg\n     * @param {vector} vector\n     * @return {vector} The negated vector\n     */\n    Vector.neg = function(vector) {\n        return { x: -vector.x, y: -vector.y };\n    };\n\n    /**\n     * Returns the angle in radians between the two vectors relative to the x-axis.\n     * @method angle\n     * @param {vector} vectorA\n     * @param {vector} vectorB\n     * @return {number} The angle in radians\n     */\n    Vector.angle = function(vectorA, vectorB) {\n        return Math.atan2(vectorB.y - vectorA.y, vectorB.x - vectorA.x);\n    };\n\n    /**\n     * Temporary vector pool (not thread-safe).\n     * @property _temp\n     * @type {vector[]}\n     * @private\n     */\n    Vector._temp = [\n        Vector.create(), Vector.create(), \n        Vector.create(), Vector.create(), \n        Vector.create(), Vector.create()\n    ];\n\n})();\n},{}],29:[function(_dereq_,module,exports){\n/**\n* The `Matter.Vertices` module contains methods for creating and manipulating sets of vertices.\n* A set of vertices is an array of `Matter.Vector` with additional indexing properties inserted by `Vertices.create`.\n* A `Matter.Body` maintains a set of vertices to represent the shape of the object (its convex hull).\n*\n* See the included usage [examples](https://github.com/liabru/matter-js/tree/master/examples).\n*\n* @class Vertices\n*/\n\nvar Vertices = {};\n\nmodule.exports = Vertices;\n\nvar Vector = _dereq_('../geometry/Vector');\nvar Common = _dereq_('../core/Common');\n\n(function() {\n\n    /**\n     * Creates a new set of `Matter.Body` compatible vertices.\n     * The `points` argument accepts an array of `Matter.Vector` points orientated around the origin `(0, 0)`, for example:\n     *\n     *     [{ x: 0, y: 0 }, { x: 25, y: 50 }, { x: 50, y: 0 }]\n     *\n     * The `Vertices.create` method returns a new array of vertices, which are similar to Matter.Vector objects,\n     * but with some additional references required for efficient collision detection routines.\n     *\n     * Vertices must be specified in clockwise order.\n     *\n     * Note that the `body` argument is not optional, a `Matter.Body` reference must be provided.\n     *\n     * @method create\n     * @param {vector[]} points\n     * @param {body} body\n     */\n    Vertices.create = function(points, body) {\n        var vertices = [];\n\n        for (var i = 0; i < points.length; i++) {\n            var point = points[i],\n                vertex = {\n                    x: point.x,\n                    y: point.y,\n                    index: i,\n                    body: body,\n                    isInternal: false\n                };\n\n            vertices.push(vertex);\n        }\n\n        return vertices;\n    };\n\n    /**\n     * Parses a string containing ordered x y pairs separated by spaces (and optionally commas), \n     * into a `Matter.Vertices` object for the given `Matter.Body`.\n     * For parsing SVG paths, see `Svg.pathToVertices`.\n     * @method fromPath\n     * @param {string} path\n     * @param {body} body\n     * @return {vertices} vertices\n     */\n    Vertices.fromPath = function(path, body) {\n        var pathPattern = /L?\\s*([\\-\\d\\.e]+)[\\s,]*([\\-\\d\\.e]+)*/ig,\n            points = [];\n\n        path.replace(pathPattern, function(match, x, y) {\n            points.push({ x: parseFloat(x), y: parseFloat(y) });\n        });\n\n        return Vertices.create(points, body);\n    };\n\n    /**\n     * Returns the centre (centroid) of the set of vertices.\n     * @method centre\n     * @param {vertices} vertices\n     * @return {vector} The centre point\n     */\n    Vertices.centre = function(vertices) {\n        var area = Vertices.area(vertices, true),\n            centre = { x: 0, y: 0 },\n            cross,\n            temp,\n            j;\n\n        for (var i = 0; i < vertices.length; i++) {\n            j = (i + 1) % vertices.length;\n            cross = Vector.cross(vertices[i], vertices[j]);\n            temp = Vector.mult(Vector.add(vertices[i], vertices[j]), cross);\n            centre = Vector.add(centre, temp);\n        }\n\n        return Vector.div(centre, 6 * area);\n    };\n\n    /**\n     * Returns the average (mean) of the set of vertices.\n     * @method mean\n     * @param {vertices} vertices\n     * @return {vector} The average point\n     */\n    Vertices.mean = function(vertices) {\n        var average = { x: 0, y: 0 };\n\n        for (var i = 0; i < vertices.length; i++) {\n            average.x += vertices[i].x;\n            average.y += vertices[i].y;\n        }\n\n        return Vector.div(average, vertices.length);\n    };\n\n    /**\n     * Returns the area of the set of vertices.\n     * @method area\n     * @param {vertices} vertices\n     * @param {bool} signed\n     * @return {number} The area\n     */\n    Vertices.area = function(vertices, signed) {\n        var area = 0,\n            j = vertices.length - 1;\n\n        for (var i = 0; i < vertices.length; i++) {\n            area += (vertices[j].x - vertices[i].x) * (vertices[j].y + vertices[i].y);\n            j = i;\n        }\n\n        if (signed)\n            return area / 2;\n\n        return Math.abs(area) / 2;\n    };\n\n    /**\n     * Returns the moment of inertia (second moment of area) of the set of vertices given the total mass.\n     * @method inertia\n     * @param {vertices} vertices\n     * @param {number} mass\n     * @return {number} The polygon's moment of inertia\n     */\n    Vertices.inertia = function(vertices, mass) {\n        var numerator = 0,\n            denominator = 0,\n            v = vertices,\n            cross,\n            j;\n\n        // find the polygon's moment of inertia, using second moment of area\n        // from equations at http://www.physicsforums.com/showthread.php?t=25293\n        for (var n = 0; n < v.length; n++) {\n            j = (n + 1) % v.length;\n            cross = Math.abs(Vector.cross(v[j], v[n]));\n            numerator += cross * (Vector.dot(v[j], v[j]) + Vector.dot(v[j], v[n]) + Vector.dot(v[n], v[n]));\n            denominator += cross;\n        }\n\n        return (mass / 6) * (numerator / denominator);\n    };\n\n    /**\n     * Translates the set of vertices in-place.\n     * @method translate\n     * @param {vertices} vertices\n     * @param {vector} vector\n     * @param {number} scalar\n     */\n    Vertices.translate = function(vertices, vector, scalar) {\n        var i;\n        if (scalar) {\n            for (i = 0; i < vertices.length; i++) {\n                vertices[i].x += vector.x * scalar;\n                vertices[i].y += vector.y * scalar;\n            }\n        } else {\n            for (i = 0; i < vertices.length; i++) {\n                vertices[i].x += vector.x;\n                vertices[i].y += vector.y;\n            }\n        }\n\n        return vertices;\n    };\n\n    /**\n     * Rotates the set of vertices in-place.\n     * @method rotate\n     * @param {vertices} vertices\n     * @param {number} angle\n     * @param {vector} point\n     */\n    Vertices.rotate = function(vertices, angle, point) {\n        if (angle === 0)\n            return;\n\n        var cos = Math.cos(angle),\n            sin = Math.sin(angle);\n\n        for (var i = 0; i < vertices.length; i++) {\n            var vertice = vertices[i],\n                dx = vertice.x - point.x,\n                dy = vertice.y - point.y;\n                \n            vertice.x = point.x + (dx * cos - dy * sin);\n            vertice.y = point.y + (dx * sin + dy * cos);\n        }\n\n        return vertices;\n    };\n\n    /**\n     * Returns `true` if the `point` is inside the set of `vertices`.\n     * @method contains\n     * @param {vertices} vertices\n     * @param {vector} point\n     * @return {boolean} True if the vertices contains point, otherwise false\n     */\n    Vertices.contains = function(vertices, point) {\n        for (var i = 0; i < vertices.length; i++) {\n            var vertice = vertices[i],\n                nextVertice = vertices[(i + 1) % vertices.length];\n            if ((point.x - vertice.x) * (nextVertice.y - vertice.y) + (point.y - vertice.y) * (vertice.x - nextVertice.x) > 0) {\n                return false;\n            }\n        }\n\n        return true;\n    };\n\n    /**\n     * Scales the vertices from a point (default is centre) in-place.\n     * @method scale\n     * @param {vertices} vertices\n     * @param {number} scaleX\n     * @param {number} scaleY\n     * @param {vector} point\n     */\n    Vertices.scale = function(vertices, scaleX, scaleY, point) {\n        if (scaleX === 1 && scaleY === 1)\n            return vertices;\n\n        point = point || Vertices.centre(vertices);\n\n        var vertex,\n            delta;\n\n        for (var i = 0; i < vertices.length; i++) {\n            vertex = vertices[i];\n            delta = Vector.sub(vertex, point);\n            vertices[i].x = point.x + delta.x * scaleX;\n            vertices[i].y = point.y + delta.y * scaleY;\n        }\n\n        return vertices;\n    };\n\n    /**\n     * Chamfers a set of vertices by giving them rounded corners, returns a new set of vertices.\n     * The radius parameter is a single number or an array to specify the radius for each vertex.\n     * @method chamfer\n     * @param {vertices} vertices\n     * @param {number[]} radius\n     * @param {number} quality\n     * @param {number} qualityMin\n     * @param {number} qualityMax\n     */\n    Vertices.chamfer = function(vertices, radius, quality, qualityMin, qualityMax) {\n        radius = radius || [8];\n\n        if (!radius.length)\n            radius = [radius];\n\n        // quality defaults to -1, which is auto\n        quality = (typeof quality !== 'undefined') ? quality : -1;\n        qualityMin = qualityMin || 2;\n        qualityMax = qualityMax || 14;\n\n        var newVertices = [];\n\n        for (var i = 0; i < vertices.length; i++) {\n            var prevVertex = vertices[i - 1 >= 0 ? i - 1 : vertices.length - 1],\n                vertex = vertices[i],\n                nextVertex = vertices[(i + 1) % vertices.length],\n                currentRadius = radius[i < radius.length ? i : radius.length - 1];\n\n            if (currentRadius === 0) {\n                newVertices.push(vertex);\n                continue;\n            }\n\n            var prevNormal = Vector.normalise({ \n                x: vertex.y - prevVertex.y, \n                y: prevVertex.x - vertex.x\n            });\n\n            var nextNormal = Vector.normalise({ \n                x: nextVertex.y - vertex.y, \n                y: vertex.x - nextVertex.x\n            });\n\n            var diagonalRadius = Math.sqrt(2 * Math.pow(currentRadius, 2)),\n                radiusVector = Vector.mult(Common.clone(prevNormal), currentRadius),\n                midNormal = Vector.normalise(Vector.mult(Vector.add(prevNormal, nextNormal), 0.5)),\n                scaledVertex = Vector.sub(vertex, Vector.mult(midNormal, diagonalRadius));\n\n            var precision = quality;\n\n            if (quality === -1) {\n                // automatically decide precision\n                precision = Math.pow(currentRadius, 0.32) * 1.75;\n            }\n\n            precision = Common.clamp(precision, qualityMin, qualityMax);\n\n            // use an even value for precision, more likely to reduce axes by using symmetry\n            if (precision % 2 === 1)\n                precision += 1;\n\n            var alpha = Math.acos(Vector.dot(prevNormal, nextNormal)),\n                theta = alpha / precision;\n\n            for (var j = 0; j < precision; j++) {\n                newVertices.push(Vector.add(Vector.rotate(radiusVector, theta * j), scaledVertex));\n            }\n        }\n\n        return newVertices;\n    };\n\n    /**\n     * Sorts the input vertices into clockwise order in place.\n     * @method clockwiseSort\n     * @param {vertices} vertices\n     * @return {vertices} vertices\n     */\n    Vertices.clockwiseSort = function(vertices) {\n        var centre = Vertices.mean(vertices);\n\n        vertices.sort(function(vertexA, vertexB) {\n            return Vector.angle(centre, vertexA) - Vector.angle(centre, vertexB);\n        });\n\n        return vertices;\n    };\n\n    /**\n     * Returns true if the vertices form a convex shape (vertices must be in clockwise order).\n     * @method isConvex\n     * @param {vertices} vertices\n     * @return {bool} `true` if the `vertices` are convex, `false` if not (or `null` if not computable).\n     */\n    Vertices.isConvex = function(vertices) {\n        // http://paulbourke.net/geometry/polygonmesh/\n        // Copyright (c) Paul Bourke (use permitted)\n\n        var flag = 0,\n            n = vertices.length,\n            i,\n            j,\n            k,\n            z;\n\n        if (n < 3)\n            return null;\n\n        for (i = 0; i < n; i++) {\n            j = (i + 1) % n;\n            k = (i + 2) % n;\n            z = (vertices[j].x - vertices[i].x) * (vertices[k].y - vertices[j].y);\n            z -= (vertices[j].y - vertices[i].y) * (vertices[k].x - vertices[j].x);\n\n            if (z < 0) {\n                flag |= 1;\n            } else if (z > 0) {\n                flag |= 2;\n            }\n\n            if (flag === 3) {\n                return false;\n            }\n        }\n\n        if (flag !== 0){\n            return true;\n        } else {\n            return null;\n        }\n    };\n\n    /**\n     * Returns the convex hull of the input vertices as a new array of points.\n     * @method hull\n     * @param {vertices} vertices\n     * @return [vertex] vertices\n     */\n    Vertices.hull = function(vertices) {\n        // http://geomalgorithms.com/a10-_hull-1.html\n\n        var upper = [],\n            lower = [], \n            vertex,\n            i;\n\n        // sort vertices on x-axis (y-axis for ties)\n        vertices = vertices.slice(0);\n        vertices.sort(function(vertexA, vertexB) {\n            var dx = vertexA.x - vertexB.x;\n            return dx !== 0 ? dx : vertexA.y - vertexB.y;\n        });\n\n        // build lower hull\n        for (i = 0; i < vertices.length; i += 1) {\n            vertex = vertices[i];\n\n            while (lower.length >= 2 \n                   && Vector.cross3(lower[lower.length - 2], lower[lower.length - 1], vertex) <= 0) {\n                lower.pop();\n            }\n\n            lower.push(vertex);\n        }\n\n        // build upper hull\n        for (i = vertices.length - 1; i >= 0; i -= 1) {\n            vertex = vertices[i];\n\n            while (upper.length >= 2 \n                   && Vector.cross3(upper[upper.length - 2], upper[upper.length - 1], vertex) <= 0) {\n                upper.pop();\n            }\n\n            upper.push(vertex);\n        }\n\n        // concatenation of the lower and upper hulls gives the convex hull\n        // omit last points because they are repeated at the beginning of the other list\n        upper.pop();\n        lower.pop();\n\n        return upper.concat(lower);\n    };\n\n})();\n\n},{\"../core/Common\":14,\"../geometry/Vector\":28}],30:[function(_dereq_,module,exports){\nvar Matter = module.exports = _dereq_('../core/Matter');\n\nMatter.Body = _dereq_('../body/Body');\nMatter.Composite = _dereq_('../body/Composite');\nMatter.World = _dereq_('../body/World');\n\nMatter.Contact = _dereq_('../collision/Contact');\nMatter.Detector = _dereq_('../collision/Detector');\nMatter.Grid = _dereq_('../collision/Grid');\nMatter.Pairs = _dereq_('../collision/Pairs');\nMatter.Pair = _dereq_('../collision/Pair');\nMatter.Query = _dereq_('../collision/Query');\nMatter.Resolver = _dereq_('../collision/Resolver');\nMatter.SAT = _dereq_('../collision/SAT');\n\nMatter.Constraint = _dereq_('../constraint/Constraint');\nMatter.MouseConstraint = _dereq_('../constraint/MouseConstraint');\n\nMatter.Common = _dereq_('../core/Common');\nMatter.Engine = _dereq_('../core/Engine');\nMatter.Events = _dereq_('../core/Events');\nMatter.Mouse = _dereq_('../core/Mouse');\nMatter.Runner = _dereq_('../core/Runner');\nMatter.Sleeping = _dereq_('../core/Sleeping');\nMatter.Plugin = _dereq_('../core/Plugin');\n\n\nMatter.Bodies = _dereq_('../factory/Bodies');\nMatter.Composites = _dereq_('../factory/Composites');\n\nMatter.Axes = _dereq_('../geometry/Axes');\nMatter.Bounds = _dereq_('../geometry/Bounds');\nMatter.Svg = _dereq_('../geometry/Svg');\nMatter.Vector = _dereq_('../geometry/Vector');\nMatter.Vertices = _dereq_('../geometry/Vertices');\n\nMatter.Render = _dereq_('../render/Render');\nMatter.RenderPixi = _dereq_('../render/RenderPixi');\n\n// aliases\n\nMatter.World.add = Matter.Composite.add;\nMatter.World.remove = Matter.Composite.remove;\nMatter.World.addComposite = Matter.Composite.addComposite;\nMatter.World.addBody = Matter.Composite.addBody;\nMatter.World.addConstraint = Matter.Composite.addConstraint;\nMatter.World.clear = Matter.Composite.clear;\nMatter.Engine.run = Matter.Runner.run;\n\n},{\"../body/Body\":1,\"../body/Composite\":2,\"../body/World\":3,\"../collision/Contact\":4,\"../collision/Detector\":5,\"../collision/Grid\":6,\"../collision/Pair\":7,\"../collision/Pairs\":8,\"../collision/Query\":9,\"../collision/Resolver\":10,\"../collision/SAT\":11,\"../constraint/Constraint\":12,\"../constraint/MouseConstraint\":13,\"../core/Common\":14,\"../core/Engine\":15,\"../core/Events\":16,\"../core/Matter\":17,\"../core/Metrics\":18,\"../core/Mouse\":19,\"../core/Plugin\":20,\"../core/Runner\":21,\"../core/Sleeping\":22,\"../factory/Bodies\":23,\"../factory/Composites\":24,\"../geometry/Axes\":25,\"../geometry/Bounds\":26,\"../geometry/Svg\":27,\"../geometry/Vector\":28,\"../geometry/Vertices\":29,\"../render/Render\":31,\"../render/RenderPixi\":32}],31:[function(_dereq_,module,exports){\n/**\n* The `Matter.Render` module is a simple HTML5 canvas based renderer for visualising instances of `Matter.Engine`.\n* It is intended for development and debugging purposes, but may also be suitable for simple games.\n* It includes a number of drawing options including wireframe, vector with support for sprites and viewports.\n*\n* @class Render\n*/\n\nvar Render = {};\n\nmodule.exports = Render;\n\nvar Common = _dereq_('../core/Common');\nvar Composite = _dereq_('../body/Composite');\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Events = _dereq_('../core/Events');\nvar Grid = _dereq_('../collision/Grid');\nvar Vector = _dereq_('../geometry/Vector');\nvar Mouse = _dereq_('../core/Mouse');\n\n(function() {\n    \n    var _requestAnimationFrame,\n        _cancelAnimationFrame;\n\n    if (typeof window !== 'undefined') {\n        _requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame\n                                      || window.mozRequestAnimationFrame || window.msRequestAnimationFrame \n                                      || function(callback){ window.setTimeout(function() { callback(Common.now()); }, 1000 / 60); };\n   \n        _cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame \n                                      || window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;\n    }\n\n    /**\n     * Creates a new renderer. The options parameter is an object that specifies any properties you wish to override the defaults.\n     * All properties have default values, and many are pre-calculated automatically based on other properties.\n     * See the properties section below for detailed information on what you can pass via the `options` object.\n     * @method create\n     * @param {object} [options]\n     * @return {render} A new renderer\n     */\n    Render.create = function(options) {\n        var defaults = {\n            controller: Render,\n            engine: null,\n            element: null,\n            canvas: null,\n            mouse: null,\n            frameRequestId: null,\n            options: {\n                width: 800,\n                height: 600,\n                pixelRatio: 1,\n                background: '#18181d',\n                wireframeBackground: '#0f0f13',\n                hasBounds: !!options.bounds,\n                enabled: true,\n                wireframes: true,\n                showSleeping: true,\n                showDebug: false,\n                showBroadphase: false,\n                showBounds: false,\n                showVelocity: false,\n                showCollisions: false,\n                showSeparations: false,\n                showAxes: false,\n                showPositions: false,\n                showAngleIndicator: false,\n                showIds: false,\n                showShadows: false,\n                showVertexNumbers: false,\n                showConvexHulls: false,\n                showInternalEdges: false,\n                showMousePosition: false\n            }\n        };\n\n        var render = Common.extend(defaults, options);\n\n        if (render.canvas) {\n            render.canvas.width = render.options.width || render.canvas.width;\n            render.canvas.height = render.options.height || render.canvas.height;\n        }\n\n        render.mouse = options.mouse;\n        render.engine = options.engine;\n        render.canvas = render.canvas || _createCanvas(render.options.width, render.options.height);\n        render.context = render.canvas.getContext('2d');\n        render.textures = {};\n\n        render.bounds = render.bounds || { \n            min: { \n                x: 0,\n                y: 0\n            }, \n            max: { \n                x: render.canvas.width,\n                y: render.canvas.height\n            }\n        };\n\n        if (render.options.pixelRatio !== 1) {\n            Render.setPixelRatio(render, render.options.pixelRatio);\n        }\n\n        if (Common.isElement(render.element)) {\n            render.element.appendChild(render.canvas);\n        } else {\n            Common.log('Render.create: options.element was undefined, render.canvas was created but not appended', 'warn');\n        }\n\n        return render;\n    };\n\n    /**\n     * Continuously updates the render canvas on the `requestAnimationFrame` event.\n     * @method run\n     * @param {render} render\n     */\n    Render.run = function(render) {\n        (function loop(time){\n            render.frameRequestId = _requestAnimationFrame(loop);\n            Render.world(render);\n        })();\n    };\n\n    /**\n     * Ends execution of `Render.run` on the given `render`, by canceling the animation frame request event loop.\n     * @method stop\n     * @param {render} render\n     */\n    Render.stop = function(render) {\n        _cancelAnimationFrame(render.frameRequestId);\n    };\n\n    /**\n     * Sets the pixel ratio of the renderer and updates the canvas.\n     * To automatically detect the correct ratio, pass the string `'auto'` for `pixelRatio`.\n     * @method setPixelRatio\n     * @param {render} render\n     * @param {number} pixelRatio\n     */\n    Render.setPixelRatio = function(render, pixelRatio) {\n        var options = render.options,\n            canvas = render.canvas;\n\n        if (pixelRatio === 'auto') {\n            pixelRatio = _getPixelRatio(canvas);\n        }\n\n        options.pixelRatio = pixelRatio;\n        canvas.setAttribute('data-pixel-ratio', pixelRatio);\n        canvas.width = options.width * pixelRatio;\n        canvas.height = options.height * pixelRatio;\n        canvas.style.width = options.width + 'px';\n        canvas.style.height = options.height + 'px';\n        render.context.scale(pixelRatio, pixelRatio);\n    };\n\n    /**\n     * Positions and sizes the viewport around the given object bounds.\n     * Objects must have at least one of the following properties:\n     * - `object.bounds`\n     * - `object.position`\n     * - `object.min` and `object.max`\n     * - `object.x` and `object.y`\n     * @method lookAt\n     * @param {render} render\n     * @param {object[]} objects\n     * @param {vector} [padding]\n     * @param {bool} [center=true]\n     */\n    Render.lookAt = function(render, objects, padding, center) {\n        center = typeof center !== 'undefined' ? center : true;\n        objects = Common.isArray(objects) ? objects : [objects];\n        padding = padding || {\n            x: 0,\n            y: 0\n        };\n\n        // find bounds of all objects\n        var bounds = {\n            min: { x: Infinity, y: Infinity },\n            max: { x: -Infinity, y: -Infinity }\n        };\n\n        for (var i = 0; i < objects.length; i += 1) {\n            var object = objects[i],\n                min = object.bounds ? object.bounds.min : (object.min || object.position || object),\n                max = object.bounds ? object.bounds.max : (object.max || object.position || object); \n\n            if (min && max) { \n                if (min.x < bounds.min.x) \n                    bounds.min.x = min.x;\n                    \n                if (max.x > bounds.max.x) \n                    bounds.max.x = max.x;\n\n                if (min.y < bounds.min.y) \n                    bounds.min.y = min.y;\n\n                if (max.y > bounds.max.y) \n                    bounds.max.y = max.y;\n            }\n        }\n\n        // find ratios\n        var width = (bounds.max.x - bounds.min.x) + 2 * padding.x,\n            height = (bounds.max.y - bounds.min.y) + 2 * padding.y,\n            viewHeight = render.canvas.height,\n            viewWidth = render.canvas.width,\n            outerRatio = viewWidth / viewHeight,\n            innerRatio = width / height,\n            scaleX = 1,\n            scaleY = 1;\n\n        // find scale factor\n        if (innerRatio > outerRatio) {\n            scaleY = innerRatio / outerRatio;\n        } else {\n            scaleX = outerRatio / innerRatio;\n        }\n\n        // enable bounds\n        render.options.hasBounds = true;\n\n        // position and size\n        render.bounds.min.x = bounds.min.x;\n        render.bounds.max.x = bounds.min.x + width * scaleX;\n        render.bounds.min.y = bounds.min.y;\n        render.bounds.max.y = bounds.min.y + height * scaleY;\n\n        // center\n        if (center) {\n            render.bounds.min.x += width * 0.5 - (width * scaleX) * 0.5;\n            render.bounds.max.x += width * 0.5 - (width * scaleX) * 0.5;\n            render.bounds.min.y += height * 0.5 - (height * scaleY) * 0.5;\n            render.bounds.max.y += height * 0.5 - (height * scaleY) * 0.5;\n        }\n\n        // padding\n        render.bounds.min.x -= padding.x;\n        render.bounds.max.x -= padding.x;\n        render.bounds.min.y -= padding.y;\n        render.bounds.max.y -= padding.y;\n\n        // update mouse\n        if (render.mouse) {\n            Mouse.setScale(render.mouse, {\n                x: (render.bounds.max.x - render.bounds.min.x) / render.canvas.width,\n                y: (render.bounds.max.y - render.bounds.min.y) / render.canvas.height\n            });\n\n            Mouse.setOffset(render.mouse, render.bounds.min);\n        }\n    };\n\n    /**\n     * Applies viewport transforms based on `render.bounds` to a render context.\n     * @method startViewTransform\n     * @param {render} render\n     */\n    Render.startViewTransform = function(render) {\n        var boundsWidth = render.bounds.max.x - render.bounds.min.x,\n            boundsHeight = render.bounds.max.y - render.bounds.min.y,\n            boundsScaleX = boundsWidth / render.options.width,\n            boundsScaleY = boundsHeight / render.options.height;\n\n        render.context.scale(1 / boundsScaleX, 1 / boundsScaleY);\n        render.context.translate(-render.bounds.min.x, -render.bounds.min.y);\n    };\n\n    /**\n     * Resets all transforms on the render context.\n     * @method endViewTransform\n     * @param {render} render\n     */\n    Render.endViewTransform = function(render) {\n        render.context.setTransform(render.options.pixelRatio, 0, 0, render.options.pixelRatio, 0, 0);\n    };\n\n    /**\n     * Renders the given `engine`'s `Matter.World` object.\n     * This is the entry point for all rendering and should be called every time the scene changes.\n     * @method world\n     * @param {render} render\n     */\n    Render.world = function(render) {\n        var engine = render.engine,\n            world = engine.world,\n            canvas = render.canvas,\n            context = render.context,\n            options = render.options,\n            allBodies = Composite.allBodies(world),\n            allConstraints = Composite.allConstraints(world),\n            background = options.wireframes ? options.wireframeBackground : options.background,\n            bodies = [],\n            constraints = [],\n            i;\n\n        var event = {\n            timestamp: engine.timing.timestamp\n        };\n\n        Events.trigger(render, 'beforeRender', event);\n\n        // apply background if it has changed\n        if (render.currentBackground !== background)\n            _applyBackground(render, background);\n\n        // clear the canvas with a transparent fill, to allow the canvas background to show\n        context.globalCompositeOperation = 'source-in';\n        context.fillStyle = \"transparent\";\n        context.fillRect(0, 0, canvas.width, canvas.height);\n        context.globalCompositeOperation = 'source-over';\n\n        // handle bounds\n        if (options.hasBounds) {\n            // filter out bodies that are not in view\n            for (i = 0; i < allBodies.length; i++) {\n                var body = allBodies[i];\n                if (Bounds.overlaps(body.bounds, render.bounds))\n                    bodies.push(body);\n            }\n\n            // filter out constraints that are not in view\n            for (i = 0; i < allConstraints.length; i++) {\n                var constraint = allConstraints[i],\n                    bodyA = constraint.bodyA,\n                    bodyB = constraint.bodyB,\n                    pointAWorld = constraint.pointA,\n                    pointBWorld = constraint.pointB;\n\n                if (bodyA) pointAWorld = Vector.add(bodyA.position, constraint.pointA);\n                if (bodyB) pointBWorld = Vector.add(bodyB.position, constraint.pointB);\n\n                if (!pointAWorld || !pointBWorld)\n                    continue;\n\n                if (Bounds.contains(render.bounds, pointAWorld) || Bounds.contains(render.bounds, pointBWorld))\n                    constraints.push(constraint);\n            }\n\n            // transform the view\n            Render.startViewTransform(render);\n\n            // update mouse\n            if (render.mouse) {\n                Mouse.setScale(render.mouse, {\n                    x: (render.bounds.max.x - render.bounds.min.x) / render.canvas.width,\n                    y: (render.bounds.max.y - render.bounds.min.y) / render.canvas.height\n                });\n\n                Mouse.setOffset(render.mouse, render.bounds.min);\n            }\n        } else {\n            constraints = allConstraints;\n            bodies = allBodies;\n        }\n\n        if (!options.wireframes || (engine.enableSleeping && options.showSleeping)) {\n            // fully featured rendering of bodies\n            Render.bodies(render, bodies, context);\n        } else {\n            if (options.showConvexHulls)\n                Render.bodyConvexHulls(render, bodies, context);\n\n            // optimised method for wireframes only\n            Render.bodyWireframes(render, bodies, context);\n        }\n\n        if (options.showBounds)\n            Render.bodyBounds(render, bodies, context);\n\n        if (options.showAxes || options.showAngleIndicator)\n            Render.bodyAxes(render, bodies, context);\n        \n        if (options.showPositions)\n            Render.bodyPositions(render, bodies, context);\n\n        if (options.showVelocity)\n            Render.bodyVelocity(render, bodies, context);\n\n        if (options.showIds)\n            Render.bodyIds(render, bodies, context);\n\n        if (options.showSeparations)\n            Render.separations(render, engine.pairs.list, context);\n\n        if (options.showCollisions)\n            Render.collisions(render, engine.pairs.list, context);\n\n        if (options.showVertexNumbers)\n            Render.vertexNumbers(render, bodies, context);\n\n        if (options.showMousePosition)\n            Render.mousePosition(render, render.mouse, context);\n\n        Render.constraints(constraints, context);\n\n        if (options.showBroadphase && engine.broadphase.controller === Grid)\n            Render.grid(render, engine.broadphase, context);\n\n        if (options.showDebug)\n            Render.debug(render, context);\n\n        if (options.hasBounds) {\n            // revert view transforms\n            Render.endViewTransform(render);\n        }\n\n        Events.trigger(render, 'afterRender', event);\n    };\n\n    /**\n     * Description\n     * @private\n     * @method debug\n     * @param {render} render\n     * @param {RenderingContext} context\n     */\n    Render.debug = function(render, context) {\n        var c = context,\n            engine = render.engine,\n            world = engine.world,\n            metrics = engine.metrics,\n            options = render.options,\n            bodies = Composite.allBodies(world),\n            space = \"    \";\n\n        if (engine.timing.timestamp - (render.debugTimestamp || 0) >= 500) {\n            var text = \"\";\n\n            if (metrics.timing) {\n                text += \"fps: \" + Math.round(metrics.timing.fps) + space;\n            }\n\n\n            render.debugString = text;\n            render.debugTimestamp = engine.timing.timestamp;\n        }\n\n        if (render.debugString) {\n            c.font = \"12px Arial\";\n\n            if (options.wireframes) {\n                c.fillStyle = 'rgba(255,255,255,0.5)';\n            } else {\n                c.fillStyle = 'rgba(0,0,0,0.5)';\n            }\n\n            var split = render.debugString.split('\\n');\n\n            for (var i = 0; i < split.length; i++) {\n                c.fillText(split[i], 50, 50 + i * 18);\n            }\n        }\n    };\n\n    /**\n     * Description\n     * @private\n     * @method constraints\n     * @param {constraint[]} constraints\n     * @param {RenderingContext} context\n     */\n    Render.constraints = function(constraints, context) {\n        var c = context;\n\n        for (var i = 0; i < constraints.length; i++) {\n            var constraint = constraints[i];\n\n            if (!constraint.render.visible || !constraint.pointA || !constraint.pointB)\n                continue;\n\n            var bodyA = constraint.bodyA,\n                bodyB = constraint.bodyB,\n                start,\n                end;\n\n            if (bodyA) {\n                start = Vector.add(bodyA.position, constraint.pointA);\n            } else {\n                start = constraint.pointA;\n            }\n\n            if (constraint.render.type === 'pin') {\n                c.beginPath();\n                c.arc(start.x, start.y, 3, 0, 2 * Math.PI);\n                c.closePath();\n            } else {\n                if (bodyB) {\n                    end = Vector.add(bodyB.position, constraint.pointB);\n                } else {\n                    end = constraint.pointB;\n                }\n\n                c.beginPath();\n                c.moveTo(start.x, start.y);\n\n                if (constraint.render.type === 'spring') {\n                    var delta = Vector.sub(end, start),\n                        normal = Vector.perp(Vector.normalise(delta)),\n                        coils = Math.ceil(Common.clamp(constraint.length / 5, 12, 20)),\n                        offset;\n\n                    for (var j = 1; j < coils; j += 1) {\n                        offset = j % 2 === 0 ? 1 : -1;\n\n                        c.lineTo(\n                            start.x + delta.x * (j / coils) + normal.x * offset * 4,\n                            start.y + delta.y * (j / coils) + normal.y * offset * 4\n                        );\n                    }\n                }\n\n                c.lineTo(end.x, end.y);\n            }\n\n            if (constraint.render.lineWidth) {\n                c.lineWidth = constraint.render.lineWidth;\n                c.strokeStyle = constraint.render.strokeStyle;\n                c.stroke();\n            }\n\n            if (constraint.render.anchors) {\n                c.fillStyle = constraint.render.strokeStyle;\n                c.beginPath();\n                c.arc(start.x, start.y, 3, 0, 2 * Math.PI);\n                c.arc(end.x, end.y, 3, 0, 2 * Math.PI);\n                c.closePath();\n                c.fill();\n            }\n        }\n    };\n    \n    /**\n     * Description\n     * @private\n     * @method bodyShadows\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyShadows = function(render, bodies, context) {\n        var c = context,\n            engine = render.engine;\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (!body.render.visible)\n                continue;\n\n            if (body.circleRadius) {\n                c.beginPath();\n                c.arc(body.position.x, body.position.y, body.circleRadius, 0, 2 * Math.PI);\n                c.closePath();\n            } else {\n                c.beginPath();\n                c.moveTo(body.vertices[0].x, body.vertices[0].y);\n                for (var j = 1; j < body.vertices.length; j++) {\n                    c.lineTo(body.vertices[j].x, body.vertices[j].y);\n                }\n                c.closePath();\n            }\n\n            var distanceX = body.position.x - render.options.width * 0.5,\n                distanceY = body.position.y - render.options.height * 0.2,\n                distance = Math.abs(distanceX) + Math.abs(distanceY);\n\n            c.shadowColor = 'rgba(0,0,0,0.15)';\n            c.shadowOffsetX = 0.05 * distanceX;\n            c.shadowOffsetY = 0.05 * distanceY;\n            c.shadowBlur = 1 + 12 * Math.min(1, distance / 1000);\n\n            c.fill();\n\n            c.shadowColor = null;\n            c.shadowOffsetX = null;\n            c.shadowOffsetY = null;\n            c.shadowBlur = null;\n        }\n    };\n\n    /**\n     * Description\n     * @private\n     * @method bodies\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodies = function(render, bodies, context) {\n        var c = context,\n            engine = render.engine,\n            options = render.options,\n            showInternalEdges = options.showInternalEdges || !options.wireframes,\n            body,\n            part,\n            i,\n            k;\n\n        for (i = 0; i < bodies.length; i++) {\n            body = bodies[i];\n\n            if (!body.render.visible)\n                continue;\n\n            // handle compound parts\n            for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {\n                part = body.parts[k];\n\n                if (!part.render.visible)\n                    continue;\n\n                if (options.showSleeping && body.isSleeping) {\n                    c.globalAlpha = 0.5 * part.render.opacity;\n                } else if (part.render.opacity !== 1) {\n                    c.globalAlpha = part.render.opacity;\n                }\n\n                if (part.render.sprite && part.render.sprite.texture && !options.wireframes) {\n                    // part sprite\n                    var sprite = part.render.sprite,\n                        texture = _getTexture(render, sprite.texture);\n\n                    c.translate(part.position.x, part.position.y); \n                    c.rotate(part.angle);\n\n                    c.drawImage(\n                        texture,\n                        texture.width * -sprite.xOffset * sprite.xScale, \n                        texture.height * -sprite.yOffset * sprite.yScale, \n                        texture.width * sprite.xScale, \n                        texture.height * sprite.yScale\n                    );\n\n                    // revert translation, hopefully faster than save / restore\n                    c.rotate(-part.angle);\n                    c.translate(-part.position.x, -part.position.y); \n                } else {\n                    // part polygon\n                    if (part.circleRadius) {\n                        c.beginPath();\n                        c.arc(part.position.x, part.position.y, part.circleRadius, 0, 2 * Math.PI);\n                    } else {\n                        c.beginPath();\n                        c.moveTo(part.vertices[0].x, part.vertices[0].y);\n\n                        for (var j = 1; j < part.vertices.length; j++) {\n                            if (!part.vertices[j - 1].isInternal || showInternalEdges) {\n                                c.lineTo(part.vertices[j].x, part.vertices[j].y);\n                            } else {\n                                c.moveTo(part.vertices[j].x, part.vertices[j].y);\n                            }\n\n                            if (part.vertices[j].isInternal && !showInternalEdges) {\n                                c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);\n                            }\n                        }\n                        \n                        c.lineTo(part.vertices[0].x, part.vertices[0].y);\n                        c.closePath();\n                    }\n\n                    if (!options.wireframes) {\n                        c.fillStyle = part.render.fillStyle;\n\n                        if (part.render.lineWidth) {\n                            c.lineWidth = part.render.lineWidth;\n                            c.strokeStyle = part.render.strokeStyle;\n                            c.stroke();\n                        }\n\n                        c.fill();\n                    } else {\n                        c.lineWidth = 1;\n                        c.strokeStyle = '#bbb';\n                        c.stroke();\n                    }\n                }\n\n                c.globalAlpha = 1;\n            }\n        }\n    };\n\n    /**\n     * Optimised method for drawing body wireframes in one pass\n     * @private\n     * @method bodyWireframes\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyWireframes = function(render, bodies, context) {\n        var c = context,\n            showInternalEdges = render.options.showInternalEdges,\n            body,\n            part,\n            i,\n            j,\n            k;\n\n        c.beginPath();\n\n        // render all bodies\n        for (i = 0; i < bodies.length; i++) {\n            body = bodies[i];\n\n            if (!body.render.visible)\n                continue;\n\n            // handle compound parts\n            for (k = body.parts.length > 1 ? 1 : 0; k < body.parts.length; k++) {\n                part = body.parts[k];\n\n                c.moveTo(part.vertices[0].x, part.vertices[0].y);\n\n                for (j = 1; j < part.vertices.length; j++) {\n                    if (!part.vertices[j - 1].isInternal || showInternalEdges) {\n                        c.lineTo(part.vertices[j].x, part.vertices[j].y);\n                    } else {\n                        c.moveTo(part.vertices[j].x, part.vertices[j].y);\n                    }\n\n                    if (part.vertices[j].isInternal && !showInternalEdges) {\n                        c.moveTo(part.vertices[(j + 1) % part.vertices.length].x, part.vertices[(j + 1) % part.vertices.length].y);\n                    }\n                }\n                \n                c.lineTo(part.vertices[0].x, part.vertices[0].y);\n            }\n        }\n\n        c.lineWidth = 1;\n        c.strokeStyle = '#bbb';\n        c.stroke();\n    };\n\n    /**\n     * Optimised method for drawing body convex hull wireframes in one pass\n     * @private\n     * @method bodyConvexHulls\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyConvexHulls = function(render, bodies, context) {\n        var c = context,\n            body,\n            part,\n            i,\n            j,\n            k;\n\n        c.beginPath();\n\n        // render convex hulls\n        for (i = 0; i < bodies.length; i++) {\n            body = bodies[i];\n\n            if (!body.render.visible || body.parts.length === 1)\n                continue;\n\n            c.moveTo(body.vertices[0].x, body.vertices[0].y);\n\n            for (j = 1; j < body.vertices.length; j++) {\n                c.lineTo(body.vertices[j].x, body.vertices[j].y);\n            }\n            \n            c.lineTo(body.vertices[0].x, body.vertices[0].y);\n        }\n\n        c.lineWidth = 1;\n        c.strokeStyle = 'rgba(255,255,255,0.2)';\n        c.stroke();\n    };\n\n    /**\n     * Renders body vertex numbers.\n     * @private\n     * @method vertexNumbers\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.vertexNumbers = function(render, bodies, context) {\n        var c = context,\n            i,\n            j,\n            k;\n\n        for (i = 0; i < bodies.length; i++) {\n            var parts = bodies[i].parts;\n            for (k = parts.length > 1 ? 1 : 0; k < parts.length; k++) {\n                var part = parts[k];\n                for (j = 0; j < part.vertices.length; j++) {\n                    c.fillStyle = 'rgba(255,255,255,0.2)';\n                    c.fillText(i + '_' + j, part.position.x + (part.vertices[j].x - part.position.x) * 0.8, part.position.y + (part.vertices[j].y - part.position.y) * 0.8);\n                }\n            }\n        }\n    };\n\n    /**\n     * Renders mouse position.\n     * @private\n     * @method mousePosition\n     * @param {render} render\n     * @param {mouse} mouse\n     * @param {RenderingContext} context\n     */\n    Render.mousePosition = function(render, mouse, context) {\n        var c = context;\n        c.fillStyle = 'rgba(255,255,255,0.8)';\n        c.fillText(mouse.position.x + '  ' + mouse.position.y, mouse.position.x + 5, mouse.position.y - 5);\n    };\n\n    /**\n     * Draws body bounds\n     * @private\n     * @method bodyBounds\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyBounds = function(render, bodies, context) {\n        var c = context,\n            engine = render.engine,\n            options = render.options;\n\n        c.beginPath();\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (body.render.visible) {\n                var parts = bodies[i].parts;\n                for (var j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {\n                    var part = parts[j];\n                    c.rect(part.bounds.min.x, part.bounds.min.y, part.bounds.max.x - part.bounds.min.x, part.bounds.max.y - part.bounds.min.y);\n                }\n            }\n        }\n\n        if (options.wireframes) {\n            c.strokeStyle = 'rgba(255,255,255,0.08)';\n        } else {\n            c.strokeStyle = 'rgba(0,0,0,0.1)';\n        }\n\n        c.lineWidth = 1;\n        c.stroke();\n    };\n\n    /**\n     * Draws body angle indicators and axes\n     * @private\n     * @method bodyAxes\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyAxes = function(render, bodies, context) {\n        var c = context,\n            engine = render.engine,\n            options = render.options,\n            part,\n            i,\n            j,\n            k;\n\n        c.beginPath();\n\n        for (i = 0; i < bodies.length; i++) {\n            var body = bodies[i],\n                parts = body.parts;\n\n            if (!body.render.visible)\n                continue;\n\n            if (options.showAxes) {\n                // render all axes\n                for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {\n                    part = parts[j];\n                    for (k = 0; k < part.axes.length; k++) {\n                        var axis = part.axes[k];\n                        c.moveTo(part.position.x, part.position.y);\n                        c.lineTo(part.position.x + axis.x * 20, part.position.y + axis.y * 20);\n                    }\n                }\n            } else {\n                for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {\n                    part = parts[j];\n                    for (k = 0; k < part.axes.length; k++) {\n                        // render a single axis indicator\n                        c.moveTo(part.position.x, part.position.y);\n                        c.lineTo((part.vertices[0].x + part.vertices[part.vertices.length-1].x) / 2, \n                                 (part.vertices[0].y + part.vertices[part.vertices.length-1].y) / 2);\n                    }\n                }\n            }\n        }\n\n        if (options.wireframes) {\n            c.strokeStyle = 'indianred';\n            c.lineWidth = 1;\n        } else {\n            c.strokeStyle = 'rgba(255, 255, 255, 0.4)';\n            c.globalCompositeOperation = 'overlay';\n            c.lineWidth = 2;\n        }\n\n        c.stroke();\n        c.globalCompositeOperation = 'source-over';\n    };\n\n    /**\n     * Draws body positions\n     * @private\n     * @method bodyPositions\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyPositions = function(render, bodies, context) {\n        var c = context,\n            engine = render.engine,\n            options = render.options,\n            body,\n            part,\n            i,\n            k;\n\n        c.beginPath();\n\n        // render current positions\n        for (i = 0; i < bodies.length; i++) {\n            body = bodies[i];\n\n            if (!body.render.visible)\n                continue;\n\n            // handle compound parts\n            for (k = 0; k < body.parts.length; k++) {\n                part = body.parts[k];\n                c.arc(part.position.x, part.position.y, 3, 0, 2 * Math.PI, false);\n                c.closePath();\n            }\n        }\n\n        if (options.wireframes) {\n            c.fillStyle = 'indianred';\n        } else {\n            c.fillStyle = 'rgba(0,0,0,0.5)';\n        }\n        c.fill();\n\n        c.beginPath();\n\n        // render previous positions\n        for (i = 0; i < bodies.length; i++) {\n            body = bodies[i];\n            if (body.render.visible) {\n                c.arc(body.positionPrev.x, body.positionPrev.y, 2, 0, 2 * Math.PI, false);\n                c.closePath();\n            }\n        }\n\n        c.fillStyle = 'rgba(255,165,0,0.8)';\n        c.fill();\n    };\n\n    /**\n     * Draws body velocity\n     * @private\n     * @method bodyVelocity\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyVelocity = function(render, bodies, context) {\n        var c = context;\n\n        c.beginPath();\n\n        for (var i = 0; i < bodies.length; i++) {\n            var body = bodies[i];\n\n            if (!body.render.visible)\n                continue;\n\n            c.moveTo(body.position.x, body.position.y);\n            c.lineTo(body.position.x + (body.position.x - body.positionPrev.x) * 2, body.position.y + (body.position.y - body.positionPrev.y) * 2);\n        }\n\n        c.lineWidth = 3;\n        c.strokeStyle = 'cornflowerblue';\n        c.stroke();\n    };\n\n    /**\n     * Draws body ids\n     * @private\n     * @method bodyIds\n     * @param {render} render\n     * @param {body[]} bodies\n     * @param {RenderingContext} context\n     */\n    Render.bodyIds = function(render, bodies, context) {\n        var c = context,\n            i,\n            j;\n\n        for (i = 0; i < bodies.length; i++) {\n            if (!bodies[i].render.visible)\n                continue;\n\n            var parts = bodies[i].parts;\n            for (j = parts.length > 1 ? 1 : 0; j < parts.length; j++) {\n                var part = parts[j];\n                c.font = \"12px Arial\";\n                c.fillStyle = 'rgba(255,255,255,0.5)';\n                c.fillText(part.id, part.position.x + 10, part.position.y - 10);\n            }\n        }\n    };\n\n    /**\n     * Description\n     * @private\n     * @method collisions\n     * @param {render} render\n     * @param {pair[]} pairs\n     * @param {RenderingContext} context\n     */\n    Render.collisions = function(render, pairs, context) {\n        var c = context,\n            options = render.options,\n            pair,\n            collision,\n            corrected,\n            bodyA,\n            bodyB,\n            i,\n            j;\n\n        c.beginPath();\n\n        // render collision positions\n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n\n            if (!pair.isActive)\n                continue;\n\n            collision = pair.collision;\n            for (j = 0; j < pair.activeContacts.length; j++) {\n                var contact = pair.activeContacts[j],\n                    vertex = contact.vertex;\n                c.rect(vertex.x - 1.5, vertex.y - 1.5, 3.5, 3.5);\n            }\n        }\n\n        if (options.wireframes) {\n            c.fillStyle = 'rgba(255,255,255,0.7)';\n        } else {\n            c.fillStyle = 'orange';\n        }\n        c.fill();\n\n        c.beginPath();\n            \n        // render collision normals\n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n\n            if (!pair.isActive)\n                continue;\n\n            collision = pair.collision;\n\n            if (pair.activeContacts.length > 0) {\n                var normalPosX = pair.activeContacts[0].vertex.x,\n                    normalPosY = pair.activeContacts[0].vertex.y;\n\n                if (pair.activeContacts.length === 2) {\n                    normalPosX = (pair.activeContacts[0].vertex.x + pair.activeContacts[1].vertex.x) / 2;\n                    normalPosY = (pair.activeContacts[0].vertex.y + pair.activeContacts[1].vertex.y) / 2;\n                }\n                \n                if (collision.bodyB === collision.supports[0].body || collision.bodyA.isStatic === true) {\n                    c.moveTo(normalPosX - collision.normal.x * 8, normalPosY - collision.normal.y * 8);\n                } else {\n                    c.moveTo(normalPosX + collision.normal.x * 8, normalPosY + collision.normal.y * 8);\n                }\n\n                c.lineTo(normalPosX, normalPosY);\n            }\n        }\n\n        if (options.wireframes) {\n            c.strokeStyle = 'rgba(255,165,0,0.7)';\n        } else {\n            c.strokeStyle = 'orange';\n        }\n\n        c.lineWidth = 1;\n        c.stroke();\n    };\n\n    /**\n     * Description\n     * @private\n     * @method separations\n     * @param {render} render\n     * @param {pair[]} pairs\n     * @param {RenderingContext} context\n     */\n    Render.separations = function(render, pairs, context) {\n        var c = context,\n            options = render.options,\n            pair,\n            collision,\n            corrected,\n            bodyA,\n            bodyB,\n            i,\n            j;\n\n        c.beginPath();\n\n        // render separations\n        for (i = 0; i < pairs.length; i++) {\n            pair = pairs[i];\n\n            if (!pair.isActive)\n                continue;\n\n            collision = pair.collision;\n            bodyA = collision.bodyA;\n            bodyB = collision.bodyB;\n\n            var k = 1;\n\n            if (!bodyB.isStatic && !bodyA.isStatic) k = 0.5;\n            if (bodyB.isStatic) k = 0;\n\n            c.moveTo(bodyB.position.x, bodyB.position.y);\n            c.lineTo(bodyB.position.x - collision.penetration.x * k, bodyB.position.y - collision.penetration.y * k);\n\n            k = 1;\n\n            if (!bodyB.isStatic && !bodyA.isStatic) k = 0.5;\n            if (bodyA.isStatic) k = 0;\n\n            c.moveTo(bodyA.position.x, bodyA.position.y);\n            c.lineTo(bodyA.position.x + collision.penetration.x * k, bodyA.position.y + collision.penetration.y * k);\n        }\n\n        if (options.wireframes) {\n            c.strokeStyle = 'rgba(255,165,0,0.5)';\n        } else {\n            c.strokeStyle = 'orange';\n        }\n        c.stroke();\n    };\n\n    /**\n     * Description\n     * @private\n     * @method grid\n     * @param {render} render\n     * @param {grid} grid\n     * @param {RenderingContext} context\n     */\n    Render.grid = function(render, grid, context) {\n        var c = context,\n            options = render.options;\n\n        if (options.wireframes) {\n            c.strokeStyle = 'rgba(255,180,0,0.1)';\n        } else {\n            c.strokeStyle = 'rgba(255,180,0,0.5)';\n        }\n\n        c.beginPath();\n\n        var bucketKeys = Common.keys(grid.buckets);\n\n        for (var i = 0; i < bucketKeys.length; i++) {\n            var bucketId = bucketKeys[i];\n\n            if (grid.buckets[bucketId].length < 2)\n                continue;\n\n            var region = bucketId.split(/C|R/);\n            c.rect(0.5 + parseInt(region[1], 10) * grid.bucketWidth, \n                    0.5 + parseInt(region[2], 10) * grid.bucketHeight, \n                    grid.bucketWidth, \n                    grid.bucketHeight);\n        }\n\n        c.lineWidth = 1;\n        c.stroke();\n    };\n\n    /**\n     * Description\n     * @private\n     * @method inspector\n     * @param {inspector} inspector\n     * @param {RenderingContext} context\n     */\n    Render.inspector = function(inspector, context) {\n        var engine = inspector.engine,\n            selected = inspector.selected,\n            render = inspector.render,\n            options = render.options,\n            bounds;\n\n        if (options.hasBounds) {\n            var boundsWidth = render.bounds.max.x - render.bounds.min.x,\n                boundsHeight = render.bounds.max.y - render.bounds.min.y,\n                boundsScaleX = boundsWidth / render.options.width,\n                boundsScaleY = boundsHeight / render.options.height;\n            \n            context.scale(1 / boundsScaleX, 1 / boundsScaleY);\n            context.translate(-render.bounds.min.x, -render.bounds.min.y);\n        }\n\n        for (var i = 0; i < selected.length; i++) {\n            var item = selected[i].data;\n\n            context.translate(0.5, 0.5);\n            context.lineWidth = 1;\n            context.strokeStyle = 'rgba(255,165,0,0.9)';\n            context.setLineDash([1,2]);\n\n            switch (item.type) {\n\n            case 'body':\n\n                // render body selections\n                bounds = item.bounds;\n                context.beginPath();\n                context.rect(Math.floor(bounds.min.x - 3), Math.floor(bounds.min.y - 3), \n                             Math.floor(bounds.max.x - bounds.min.x + 6), Math.floor(bounds.max.y - bounds.min.y + 6));\n                context.closePath();\n                context.stroke();\n\n                break;\n\n            case 'constraint':\n\n                // render constraint selections\n                var point = item.pointA;\n                if (item.bodyA)\n                    point = item.pointB;\n                context.beginPath();\n                context.arc(point.x, point.y, 10, 0, 2 * Math.PI);\n                context.closePath();\n                context.stroke();\n\n                break;\n\n            }\n\n            context.setLineDash([]);\n            context.translate(-0.5, -0.5);\n        }\n\n        // render selection region\n        if (inspector.selectStart !== null) {\n            context.translate(0.5, 0.5);\n            context.lineWidth = 1;\n            context.strokeStyle = 'rgba(255,165,0,0.6)';\n            context.fillStyle = 'rgba(255,165,0,0.1)';\n            bounds = inspector.selectBounds;\n            context.beginPath();\n            context.rect(Math.floor(bounds.min.x), Math.floor(bounds.min.y), \n                         Math.floor(bounds.max.x - bounds.min.x), Math.floor(bounds.max.y - bounds.min.y));\n            context.closePath();\n            context.stroke();\n            context.fill();\n            context.translate(-0.5, -0.5);\n        }\n\n        if (options.hasBounds)\n            context.setTransform(1, 0, 0, 1, 0, 0);\n    };\n\n    /**\n     * Description\n     * @method _createCanvas\n     * @private\n     * @param {} width\n     * @param {} height\n     * @return canvas\n     */\n    var _createCanvas = function(width, height) {\n        var canvas = document.createElement('canvas');\n        canvas.width = width;\n        canvas.height = height;\n        canvas.oncontextmenu = function() { return false; };\n        canvas.onselectstart = function() { return false; };\n        return canvas;\n    };\n\n    /**\n     * Gets the pixel ratio of the canvas.\n     * @method _getPixelRatio\n     * @private\n     * @param {HTMLElement} canvas\n     * @return {Number} pixel ratio\n     */\n    var _getPixelRatio = function(canvas) {\n        var context = canvas.getContext('2d'),\n            devicePixelRatio = window.devicePixelRatio || 1,\n            backingStorePixelRatio = context.webkitBackingStorePixelRatio || context.mozBackingStorePixelRatio\n                                      || context.msBackingStorePixelRatio || context.oBackingStorePixelRatio\n                                      || context.backingStorePixelRatio || 1;\n\n        return devicePixelRatio / backingStorePixelRatio;\n    };\n\n    /**\n     * Gets the requested texture (an Image) via its path\n     * @method _getTexture\n     * @private\n     * @param {render} render\n     * @param {string} imagePath\n     * @return {Image} texture\n     */\n    var _getTexture = function(render, imagePath) {\n        var image = render.textures[imagePath];\n\n        if (image)\n            return image;\n\n        image = render.textures[imagePath] = new Image();\n        image.src = imagePath;\n\n        return image;\n    };\n\n    /**\n     * Applies the background to the canvas using CSS.\n     * @method applyBackground\n     * @private\n     * @param {render} render\n     * @param {string} background\n     */\n    var _applyBackground = function(render, background) {\n        var cssBackground = background;\n\n        if (/(jpg|gif|png)$/.test(background))\n            cssBackground = 'url(' + background + ')';\n\n        render.canvas.style.background = cssBackground;\n        render.canvas.style.backgroundSize = \"contain\";\n        render.currentBackground = background;\n    };\n\n    /*\n    *\n    *  Events Documentation\n    *\n    */\n\n    /**\n    * Fired before rendering\n    *\n    * @event beforeRender\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /**\n    * Fired after rendering\n    *\n    * @event afterRender\n    * @param {} event An event object\n    * @param {number} event.timestamp The engine.timing.timestamp of the event\n    * @param {} event.source The source object of the event\n    * @param {} event.name The name of the event\n    */\n\n    /*\n    *\n    *  Properties Documentation\n    *\n    */\n\n    /**\n     * A back-reference to the `Matter.Render` module.\n     *\n     * @property controller\n     * @type render\n     */\n\n    /**\n     * A reference to the `Matter.Engine` instance to be used.\n     *\n     * @property engine\n     * @type engine\n     */\n\n    /**\n     * A reference to the element where the canvas is to be inserted (if `render.canvas` has not been specified)\n     *\n     * @property element\n     * @type HTMLElement\n     * @default null\n     */\n\n    /**\n     * The canvas element to render to. If not specified, one will be created if `render.element` has been specified.\n     *\n     * @property canvas\n     * @type HTMLCanvasElement\n     * @default null\n     */\n\n    /**\n     * The configuration options of the renderer.\n     *\n     * @property options\n     * @type {}\n     */\n\n    /**\n     * The target width in pixels of the `render.canvas` to be created.\n     *\n     * @property options.width\n     * @type number\n     * @default 800\n     */\n\n    /**\n     * The target height in pixels of the `render.canvas` to be created.\n     *\n     * @property options.height\n     * @type number\n     * @default 600\n     */\n\n    /**\n     * A flag that specifies if `render.bounds` should be used when rendering.\n     *\n     * @property options.hasBounds\n     * @type boolean\n     * @default false\n     */\n\n    /**\n     * A `Bounds` object that specifies the drawing view region. \n     * Rendering will be automatically transformed and scaled to fit within the canvas size (`render.options.width` and `render.options.height`).\n     * This allows for creating views that can pan or zoom around the scene.\n     * You must also set `render.options.hasBounds` to `true` to enable bounded rendering.\n     *\n     * @property bounds\n     * @type bounds\n     */\n\n    /**\n     * The 2d rendering context from the `render.canvas` element.\n     *\n     * @property context\n     * @type CanvasRenderingContext2D\n     */\n\n    /**\n     * The sprite texture cache.\n     *\n     * @property textures\n     * @type {}\n     */\n\n})();\n\n},{\"../body/Composite\":2,\"../collision/Grid\":6,\"../core/Common\":14,\"../core/Events\":16,\"../core/Mouse\":19,\"../geometry/Bounds\":26,\"../geometry/Vector\":28}],32:[function(_dereq_,module,exports){\n/**\n* The `Matter.RenderPixi` module is an example renderer using pixi.js.\n* See also `Matter.Render` for a canvas based renderer.\n*\n* @class RenderPixi\n* @deprecated the Matter.RenderPixi module will soon be removed from the Matter.js core.\n* It will likely be moved to its own repository (but maintenance will be limited).\n*/\n\nvar RenderPixi = {};\n\nmodule.exports = RenderPixi;\n\nvar Bounds = _dereq_('../geometry/Bounds');\nvar Composite = _dereq_('../body/Composite');\nvar Common = _dereq_('../core/Common');\nvar Events = _dereq_('../core/Events');\nvar Vector = _dereq_('../geometry/Vector');\n\n(function() {\n\n    var _requestAnimationFrame,\n        _cancelAnimationFrame;\n\n    if (typeof window !== 'undefined') {\n        _requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame\n                                      || window.mozRequestAnimationFrame || window.msRequestAnimationFrame \n                                      || function(callback){ window.setTimeout(function() { callback(Common.now()); }, 1000 / 60); };\n   \n        _cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame \n                                      || window.webkitCancelAnimationFrame || window.msCancelAnimationFrame;\n    }\n    \n    /**\n     * Creates a new Pixi.js WebGL renderer\n     * @method create\n     * @param {object} options\n     * @return {RenderPixi} A new renderer\n     * @deprecated\n     */\n    RenderPixi.create = function(options) {\n        Common.warn('RenderPixi.create: Matter.RenderPixi is deprecated (see docs)');\n\n        var defaults = {\n            controller: RenderPixi,\n            engine: null,\n            element: null,\n            frameRequestId: null,\n            canvas: null,\n            renderer: null,\n            container: null,\n            spriteContainer: null,\n            pixiOptions: null,\n            options: {\n                width: 800,\n                height: 600,\n                background: '#fafafa',\n                wireframeBackground: '#222',\n                hasBounds: false,\n                enabled: true,\n                wireframes: true,\n                showSleeping: true,\n                showDebug: false,\n                showBroadphase: false,\n                showBounds: false,\n                showVelocity: false,\n                showCollisions: false,\n                showAxes: false,\n                showPositions: false,\n                showAngleIndicator: false,\n                showIds: false,\n                showShadows: false\n            }\n        };\n\n        var render = Common.extend(defaults, options),\n            transparent = !render.options.wireframes && render.options.background === 'transparent';\n\n        // init pixi\n        render.pixiOptions = render.pixiOptions || {\n            view: render.canvas,\n            transparent: transparent,\n            antialias: true,\n            backgroundColor: options.background\n        };\n\n        render.mouse = options.mouse;\n        render.engine = options.engine;\n        render.renderer = render.renderer || new PIXI.WebGLRenderer(render.options.width, render.options.height, render.pixiOptions);\n        render.container = render.container || new PIXI.Container();\n        render.spriteContainer = render.spriteContainer || new PIXI.Container();\n        render.canvas = render.canvas || render.renderer.view;\n        render.bounds = render.bounds || { \n            min: {\n                x: 0,\n                y: 0\n            }, \n            max: { \n                x: render.options.width,\n                y: render.options.height\n            }\n        };\n\n        // event listeners\n        Events.on(render.engine, 'beforeUpdate', function() {\n            RenderPixi.clear(render);\n        });\n\n        // caches\n        render.textures = {};\n        render.sprites = {};\n        render.primitives = {};\n\n        // use a sprite batch for performance\n        render.container.addChild(render.spriteContainer);\n\n        // insert canvas\n        if (Common.isElement(render.element)) {\n            render.element.appendChild(render.canvas);\n        } else {\n            Common.warn('No \"render.element\" passed, \"render.canvas\" was not inserted into document.');\n        }\n\n        // prevent menus on canvas\n        render.canvas.oncontextmenu = function() { return false; };\n        render.canvas.onselectstart = function() { return false; };\n\n        return render;\n    };\n\n    /**\n     * Continuously updates the render canvas on the `requestAnimationFrame` event.\n     * @method run\n     * @param {render} render\n     * @deprecated\n     */\n    RenderPixi.run = function(render) {\n        (function loop(time){\n            render.frameRequestId = _requestAnimationFrame(loop);\n            RenderPixi.world(render);\n        })();\n    };\n\n    /**\n     * Ends execution of `Render.run` on the given `render`, by canceling the animation frame request event loop.\n     * @method stop\n     * @param {render} render\n     * @deprecated\n     */\n    RenderPixi.stop = function(render) {\n        _cancelAnimationFrame(render.frameRequestId);\n    };\n\n    /**\n     * Clears the scene graph\n     * @method clear\n     * @param {RenderPixi} render\n     * @deprecated\n     */\n    RenderPixi.clear = function(render) {\n        var container = r
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