aemkei/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    rotate3D - 140byt.es

A simple 3D "library" in 140 bytes of JavaScript.
See the demo page: http://jsfiddle.net/aemkei/cPa3T/show/
Usage

rotate3D(
  pointX, pointY, pointZ, 
  rotationX, rotationY, 
  focalLength
);

// returns new coords: 
{ x: newX, y: newY, z: newZ }

Author

Created by Martin Kleppe (@aemkei) at Ubilabs.
For more information

See the 140byt.es site for a showcase of entries (built itself using 140-byte entries!), and follow @140bytes on Twitter.
To learn about byte-saving hacks for your own code, or to contribute what you've learned, head to the wiki.
140byt.es is brought to you by Jed Schmidt, with help from Alex Kloss. It was inspired by work from Thomas Fuchs and Dustin Diaz.

  
## 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
  };
}

## 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}}

## 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.

## package.json
{
  "name": "rotate3D",

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

  "keywords": [
    "3d",
    "rotate"
  ]
}

## 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>