Created
July 26, 2012 18:15
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$('svg').css('background', 'black'); | |
var g = d3.select('svg') | |
.append('g') | |
.attr('transform', 'translate(' | |
+ $('svg').width()/2 | |
+ ', ' | |
+ 499 | |
+ ')'); | |
var randomNumbers; | |
if ($('svg').data('randomNumbers')) { | |
randomNumbers = $('svg').data('randomNumbers'); | |
} else { | |
randomNumbers = []; | |
for (var i = 0; i < 1000000; i++) { | |
randomNumbers.push(Math.random()); | |
} | |
randomNumbers = $('svg').data('randomNumbers', randomNumbers); | |
} | |
var randomIndex = 0; | |
function getNextRandomNumber() { | |
if (randomIndex >= randomNumbers.length) { | |
randomIndex = 0; | |
} | |
return randomNumbers[randomIndex++]; | |
} | |
function generateAngle(a, b) { | |
return a + b * getNextRandomNumber(); | |
} | |
function degreesToRadians(degrees) { | |
return degrees * 2 * Math.PI / 360; | |
} | |
function generatePoint(point, angle, distance) { | |
return { | |
x:point.x + (distance * Math.cos(degreesToRadians(angle))), | |
y:point.y + (distance * Math.sin(degreesToRadians(angle))) | |
}; | |
} | |
function generatePoints() { | |
var points = [], | |
branchSegments = 10, branchLength = 35, | |
angle = 90, point = {x:0, y:0}, | |
maxAngleDelta = 23, | |
tendency = getNextRandomNumber(); | |
// each branch has a tendency - the probability that the next angle will go | |
// left or right. for example, tendency = 0.33, which means 33% of the time, | |
// the graph will go left. when computing the next angle, we first find the | |
// angle based on the previous angle (and also take into account maxAngleDelta), | |
// and then draw a random number between 0 and 1. if the number is equal or less | |
// than tendency, multiply angle by -1. | |
// generate branch points | |
points.push(point); | |
for (var j = 0; j < 4; j++) { | |
point = generatePoint(point, angle, branchLength); | |
points.push(point); | |
} | |
for (var i = 0; i < branchSegments; i++) { | |
maxAngleDelta = Math.abs(maxAngleDelta); | |
var random = getNextRandomNumber(); | |
if (random <= tendency) { | |
maxAngleDelta *= -1; | |
} | |
angle = generateAngle(angle, maxAngleDelta); | |
point = generatePoint(point, angle, branchLength); | |
points.push(point); | |
} | |
return points; | |
} | |
var x = d3.scale.linear() | |
.domain([0, 57]) | |
.range([0, 64]); | |
var y = d3.scale.linear() | |
.domain([0, 37]) | |
.range([38, 0]); | |
var line = d3.svg.line() | |
.x(function(d, i) { | |
return x(d.x); | |
}) | |
.y(function(d, i) { | |
return y(d.y); | |
}) | |
.interpolate('basis'); | |
function generateColor() { | |
var colors = ["#1693A5", "#45B5C4", "#7ECECA", "#A0DED6", "#C7EDE8"]; | |
var random = Math.floor(getNextRandomNumber() * colors.length); | |
return colors[random]; | |
} | |
function addBranch() { | |
var branchPoints = generatePoints(); | |
var color = generateColor(); | |
g.append('path') | |
.attr('d', line(branchPoints)) | |
.style('stroke', color) | |
.style('fill', 'none') | |
.style('stroke-width', 38) | |
.on('mouseover', function(d) { | |
d3.select(this).style('stroke', '#F8F9ED'); | |
}) | |
.on('mouseout', function(d) { | |
d3.select(this).style('stroke', color); | |
}) | |
; | |
} | |
for (var i = 0; i < 67; i++) { | |
addBranch(); | |
} | |
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