aemkei · August 5, 2011 10:24 · atk · Aug 6, 2011 · plu · Sep 3, 2011
diff --git a/README.md b/README.md
diff --git a/annotated.js b/annotated.js
 // pass x,y,z coords, the rotation and the camera focal length
 function rotate3D(
  pointX, pointY, pointZ, 
  rotationX, rotationY, 
  focalLength
 ){
  var sin = Math.sin,
    cos = Math.cos,
    xz = sin(rotationX) * pointY + cos(rotationX) * pointZ,
    yz = cos(rotationY) * xz - sin(rotationY) * pointX,
    scale = (focalLength / (focalLength + yz));
  
  // returns the new coords as an object
  return {
    x: sin(rotationY) * xz + cos(rotationY) * pointX * scale,
    y: (cos(rotationX) * pointY - sin(rotationX) * pointZ) * scale,
    z: yz
  };
 }
diff --git a/index.js b/index.js
 function(a,b,c,d,e,f){var g=Math.sin,h=Math.cos,i=g(d)*b+h(d)*c,j=h(e)*i-g(e)*a,k=f/(f+j);return{x:g(e)*i+h(e)*a*k,y:(h(d)*b-g(d)*c)*k,z:j}}
diff --git a/LICENSE.txt b/LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.
diff --git a/package.json b/package.json
 {
  "name": "rotate3D",

  "description": "A 3D rotation method. Simply pass a point, rotation (X,Y) and focal length.",

  "keywords": [
    "3d",
    "rotate"
  ]
 }
diff --git a/test.html b/test.html
 <!DOCTYPE html> 
 <head>
  <title>rotate3D - 140bytes</title>
  <style type="text/css">
    body { background-color: #000; overflow: hidden; }
    #stage { width: 1px; height: 1px; margin: 200px auto 0; position: relative; }
    a { display: block; text-align: center; color: #FFF; }  
    #stage div { background: #FFF; width: 4px; height: 4px; position: absolute; }
  </style>
 </head>

 <body>
  <a href="https://gist.github.com/1127274">View Source</a>
  <div id="stage"></div>

  <script>  
    function rotate3D(a,b,c,d,e,f){var g=Math.sin,h=Math.cos,i=g(d)*b+h(d)*c,j=h(e)*i-g(e)*a,k=f/(f+j);return{x:g(e)*i+h(e)*a*k,y:(h(d)*b-g(d)*c)*k,z:j}};
  
    var points = [],
      elems = [],
      rotateX = 0,
      rotateY = 0;
  
    function createCube(){
      var x, y, z;
      for (x=-1; x<2; x++){
        for (y=-1; y<2; y++){
          for (z=-1; z<2; z++){
            points.push({
              x: x * 100,
              y: y * 100,
              z: z*100
            });
          }
        }
      }
    }
  
    function setup(){
      var stage = document.getElementById("stage"),
        elem, i, point;
    
      for (i=0; point=points[i]; i++){
        elem = document.createElement("div");
        stage.appendChild(elem);
        elems.push(elem);
      }
    }
  
    function render(){
      var i, point, coords, size;
    
      rotateX += 0.03;
      rotateY += 0.07;
    
      for (i=0; point=points[i]; i++){
        coords = rotate3D(point.x, point.y, point.z, rotateX, rotateY, 500);
        elem = elems[i];
        size = (200-coords.z) / 20;
      
        elem.style.top = coords.y + "px";
        elem.style.left = coords.x + "px";
        elem.style.width = size + "px";
        elem.style.height = size + "px";
        elem.style.opacity = size/20;
      }
      setTimeout(render, 40);
    }
  
    createCube();
    setup();
    render();
  </script>
 </body>
	// pass x,y,z coords, the rotation and the camera focal length
	function rotate3D(
	pointX, pointY, pointZ,
	rotationX, rotationY,
	focalLength
	){
	var sin = Math.sin,
	cos = Math.cos,
	xz = sin(rotationX) * pointY + cos(rotationX) * pointZ,
	yz = cos(rotationY) * xz - sin(rotationY) * pointX,
	scale = (focalLength / (focalLength + yz));

	// returns the new coords as an object
	return {
	x: sin(rotationY) * xz + cos(rotationY) * pointX * scale,
	y: (cos(rotationX) * pointY - sin(rotationX) * pointZ) * scale,
	z: yz
	};
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "rotate3D",

	"description": "A 3D rotation method. Simply pass a point, rotation (X,Y) and focal length.",

	"keywords": [
	"3d",
	"rotate"
	]
	}
	<!DOCTYPE html>
	<head>
	<title>rotate3D - 140bytes</title>
	<style type="text/css">
	body { background-color: #000; overflow: hidden; }
	#stage { width: 1px; height: 1px; margin: 200px auto 0; position: relative; }
	a { display: block; text-align: center; color: #FFF; }
	#stage div { background: #FFF; width: 4px; height: 4px; position: absolute; }
	</style>
	</head>

	<body>
	<a href="https://gist.github.com/1127274">View Source</a>
	<div id="stage"></div>

	<script>
	function rotate3D(a,b,c,d,e,f){var g=Math.sin,h=Math.cos,i=g(d)b+h(d)c,j=h(e)i-g(e)a,k=f/(f+j);return{x:g(e)i+h(e)ak,y:(h(d)b-g(d)c)k,z:j}};

	var points = [],
	elems = [],
	rotateX = 0,
	rotateY = 0;

	function createCube(){
	var x, y, z;
	for (x=-1; x<2; x++){
	for (y=-1; y<2; y++){
	for (z=-1; z<2; z++){
	points.push({
	x: x * 100,
	y: y * 100,
	z: z*100
	});
	}
	}
	}
	}

	function setup(){
	var stage = document.getElementById("stage"),
	elem, i, point;

	for (i=0; point=points[i]; i++){
	elem = document.createElement("div");
	stage.appendChild(elem);
	elems.push(elem);
	}
	}

	function render(){
	var i, point, coords, size;

	rotateX += 0.03;
	rotateY += 0.07;

	for (i=0; point=points[i]; i++){
	coords = rotate3D(point.x, point.y, point.z, rotateX, rotateY, 500);
	elem = elems[i];
	size = (200-coords.z) / 20;

	elem.style.top = coords.y + "px";
	elem.style.left = coords.x + "px";
	elem.style.width = size + "px";
	elem.style.height = size + "px";
	elem.style.opacity = size/20;
	}
	setTimeout(render, 40);
	}

	createCube();
	setup();
	render();
	</script>
	</body>