maxw3st/index.coffeescript

## index.coffeescript

###
  Text masked spring particles
    Author: Kushagra Gour a.k.a. Chin Chang
###
# requestanimationframe polyfill
window.requestAnimFrame = (->
  return  window.requestAnimationFrame       ||
		  window.webkitRequestAnimationFrame ||
		  window.mozRequestAnimationFrame    ||
		  window.oRequestAnimationFrame      ||
		  window.msRequestAnimationFrame     ||
		  (callback) ->
			window.setTimeout callback, 1000 / 60
)();

# variables
canvas = null
ctx = null
num_particles = 800
density = 8
min_distance = 70
text_array = []
display_list = []
last_time = null
spring_constant = 0.2
damping_constant = 0.08
colors = ['#184DF4', '#F49A03', '#E01730', '#00A415']
W = window.innerWidth
H = window.innerHeight

init = (e) ->
	canvas = document.getElementById 'c'
	ctx = canvas.getContext '2d'
	canvas.width = W
	canvas.height = H
	canvas.addEventListener 'mousemove', onMouseMove

	changeWord 'Koi Mundo'

	# create particles
	if text_array.length
		for i in [0...num_particles]
			display_list.push new Particle

getTextArray = (ox, oy, w, h) ->
	text_array = []
	data = ctx.getImageData(ox, oy, w, h).data
	for i in [0...h] by density
		for j in [0...w] by density
			linear_index = (i * w + j) * 4
			if data[linear_index + 3] isnt 0
				text_array.push {x: j, y: i}

	return text_array

onMouseMove = (e) ->
	mx = e.offsetX || e.pageX
	my = e.offsetY || e.pageY
	for child in display_list
		dx = child.x - mx
		dy = child.y - my
		d = Math.sqrt dx * dx + dy * dy
		if d < min_distance
			child.speed_x += dx * 0.05
			child.speed_y += dy * 0.05

changeWord = (str) ->
	# clear the canvas first
	ctx.clearRect 0, 0, W, H

	# draw the new text
	ctx.fillStyle = "#000"
	ctx.textBaseline = 'top'
	ctx.textAlign = 'center'
	ctx.font = "200px Arial"
	ctx.fillText str, W/2, 0

	# get the text points
	text_array = getTextArray 0, 0, W, H
	for child in display_list
		child.reposition()

animate = ->
	animationLoop()
	requestAnimFrame animate

animationLoop = ->
	if !last_time then last_time = (new Date).getTime()
	current_time = (new Date).getTime()
	dt = (current_time - last_time) / 1000
	last_time = current_time
	window.fps = 1 / dt

	draw()
	update()

draw = ->
	ctx.fillStyle = "#111"
	ctx.fillRect 0, 0, W, H

	for child in display_list
		continue if typeof child.draw isnt 'function'
		ctx.save();
		ctx.translate child.x, child.y unless isNaN child.x or isNaN child.y
		ctx.scale child.scale_x, child.scale_y unless isNaN child.scale_x or isNaN child.scale_y
		ctx.globalAlpha = child.alpha unless isNaN child.alpha
		child.draw()
		ctx.restore();

update = ->
	# update particles
	for child in display_list
		child.update() if typeof child.update is 'function'

class Particle
	constructor: (@radius = 1, @x = Math.random() * W, @y = Math.random() * H) ->
		@speed_x = 10 - Math.random() * 20
		@speed_y = 10 - Math.random() * 20
		@color = "#ff0"
		@alpha = 1
		@reposition()
		@reset()

	draw: ->
		#ctx.drawImage canvas2, 0, 0
		ctx.fillStyle = @color
		ctx.beginPath()
		ctx.arc 4, 4, 4, 0, Math.PI*2, true
		ctx.fill()

	update: ->
		acc_x = -spring_constant * (@x - @ox) - damping_constant * @speed_x
		acc_y = -spring_constant * (@y - @oy) - damping_constant * @speed_y
		@speed_x +=  acc_x
		@speed_y +=  acc_y
		@alpha -= 0.019
		@scale_x += 0.06
		@scale_y += 0.06
		@x += @speed_x
		@y += @speed_y

		if @alpha <= 0
			@reset()

	reset: ->
		@alpha = Math.random()
		@scale_x = @scale_y = 0
		@color = colors[~~(Math.random() * colors.length)]

	reposition: ->
		point = text_array[~~(Math.random() * text_array.length)]
		@ox = @x = point.x + ~~(3 + Math.random() * 6)
		@oy = @y = point.y + ~~(3 + Math.random() * 6)

init()
animate()

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">

  <title>Sppringgy jelly! &middot; CodePen</title>
  <!--
    Copyright (c) 2012 maxw3st, http://codepen.io/maxw3st

    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.
  -->

  <style>
body { margin: 0; }
span { position: absolute; top: 15px; left: 5px; color: white; }
  </style>

  <style>
    #codepen-footer, #codepen-footer * {
      -webkit-box-sizing: border-box !important;
      -moz-box-sizing: border-box !important;
      box-sizing: border-box !important;
    }
    #codepen-footer {
      display: block !important;
      position: fixed !important;
      bottom: 0 !important;
      left: 0 !important;
      width: 100% !important;
      padding: 0 10px !important;
      margin: 0 !important;
      height: 30px !important;
      line-height: 30px !important;
      font-size: 12px !important;
      color: #eeeeee !important;
      background-color: #505050 !important;
      text-align: left !important;
      background: -webkit-linear-gradient(top, #505050, #383838) !important;
      background: -moz-linear-gradient(top, #505050, #383838) !important;
      background: -ms-linear-gradient(top, #505050, #383838) !important;
      background: -o-linear-gradient(top, #505050, #383838) !important;
      border-top: 1px solid black !important;
      border-bottom: 1px solid black !important;
      border-radius: 0 !important;
      border-image: none !important;
      box-shadow: inset 0 1px 0 #6e6e6e, 0 2px 2px rgba(0, 0, 0, 0.4) !important;
      z-index: 300 !important;
      font-family: "Lucida Grande", "Lucida Sans Unicode", Tahoma, sans-serif !important;
      letter-spacing: 0 !important;
      word-spacing: normal !important;
      word-spacing: 0 !important;
      -webkit-transform: none !important;
      -moz-transform: none !important;
      -ms-transform: none !important;
      -o-transform: none !important;
      transform: none !important;
    }
    #codepen-footer a {
      color: #a7a7a7 !important;
      text-decoration: none !important;
      text-shadow: none !important;
      border: 0 !important;
    }
    #codepen-footer a:hover {
      color: white !important;
    }
  </style>
  <script>
    // Kill alerts, confirmations and prompts
    // window.alert   = function(){}; we're going to allow alerts for now
    window.confirm = function(){};
    window.prompt  = function(){};
    window.open    = function(){};
    window.print   = function(){};
  </script>

</head>
<body>

  <canvas id=c></canvas>
<span>Try disturbing the particles with mouse</span>

  <script>
(function() {

/*
  Text masked spring particles
    Author: Kushagra Gour a.k.a. Chin Chang
*/

(function() {
  var H, Particle, W, animate, animationLoop, canvas, changeWord, colors, ctx, damping_constant, density, display_list, draw, getTextArray, init, last_time, min_distance, num_particles, onMouseMove, spring_constant, text_array, update;

  window.requestAnimFrame = (function() {
    return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) {
      return window.setTimeout(callback, 1000 / 60);
    };
  })();

  canvas = null;

  ctx = null;

  num_particles = 800;

  density = 8;

  min_distance = 70;

  text_array = [];

  display_list = [];

  last_time = null;

  spring_constant = 0.2;

  damping_constant = 0.08;

  colors = ['#184DF4', '#F49A03', '#E01730', '#00A415'];

  W = window.innerWidth;

  H = window.innerHeight;

  init = function(e) {
    var i, _results;
    canvas = document.getElementById('c');
    ctx = canvas.getContext('2d');
    canvas.width = W;
    canvas.height = H;
    canvas.addEventListener('mousemove', onMouseMove);
    changeWord('Koi Mundo');
    if (text_array.length) {
      _results = [];
      for (i = 0; 0 <= num_particles ? i < num_particles : i > num_particles; 0 <= num_particles ? i++ : i--) {
        _results.push(display_list.push(new Particle));
      }
      return _results;
    }
  };

  getTextArray = function(ox, oy, w, h) {
    var data, i, j, linear_index;
    text_array = [];
    data = ctx.getImageData(ox, oy, w, h).data;
    for (i = 0; 0 <= h ? i < h : i > h; i += density) {
      for (j = 0; 0 <= w ? j < w : j > w; j += density) {
        linear_index = (i * w + j) * 4;
        if (data[linear_index + 3] !== 0) {
          text_array.push({
            x: j,
            y: i
          });
        }
      }
    }
    return text_array;
  };

  onMouseMove = function(e) {
    var child, d, dx, dy, mx, my, _i, _len, _results;
    mx = e.offsetX || e.pageX;
    my = e.offsetY || e.pageY;
    _results = [];
    for (_i = 0, _len = display_list.length; _i < _len; _i++) {
      child = display_list[_i];
      dx = child.x - mx;
      dy = child.y - my;
      d = Math.sqrt(dx * dx + dy * dy);
      if (d < min_distance) {
        child.speed_x += dx * 0.05;
        _results.push(child.speed_y += dy * 0.05);
      } else {
        _results.push(void 0);
      }
    }
    return _results;
  };

  changeWord = function(str) {
    var child, _i, _len, _results;
    ctx.clearRect(0, 0, W, H);
    ctx.fillStyle = "#000";
    ctx.textBaseline = 'top';
    ctx.textAlign = 'center';
    ctx.font = "200px Arial";
    ctx.fillText(str, W / 2, 0);
    text_array = getTextArray(0, 0, W, H);
    _results = [];
    for (_i = 0, _len = display_list.length; _i < _len; _i++) {
      child = display_list[_i];
      _results.push(child.reposition());
    }
    return _results;
  };

  animate = function() {
    animationLoop();
    return requestAnimFrame(animate);
  };

  animationLoop = function() {
    var current_time, dt;
    if (!last_time) last_time = (new Date).getTime();
    current_time = (new Date).getTime();
    dt = (current_time - last_time) / 1000;
    last_time = current_time;
    window.fps = 1 / dt;
    draw();
    return update();
  };

  draw = function() {
    var child, _i, _len, _results;
    ctx.fillStyle = "#111";
    ctx.fillRect(0, 0, W, H);
    _results = [];
    for (_i = 0, _len = display_list.length; _i < _len; _i++) {
      child = display_list[_i];
      if (typeof child.draw !== 'function') continue;
      ctx.save();
      if (!isNaN(child.x || isNaN(child.y))) ctx.translate(child.x, child.y);
      if (!isNaN(child.scale_x || isNaN(child.scale_y))) {
        ctx.scale(child.scale_x, child.scale_y);
      }
      if (!isNaN(child.alpha)) ctx.globalAlpha = child.alpha;
      child.draw();
      _results.push(ctx.restore());
    }
    return _results;
  };

  update = function() {
    var child, _i, _len, _results;
    _results = [];
    for (_i = 0, _len = display_list.length; _i < _len; _i++) {
      child = display_list[_i];
      if (typeof child.update === 'function') {
        _results.push(child.update());
      } else {
        _results.push(void 0);
      }
    }
    return _results;
  };

  Particle = (function() {

    function Particle(radius, x, y) {
      this.radius = radius != null ? radius : 1;
      this.x = x != null ? x : Math.random() * W;
      this.y = y != null ? y : Math.random() * H;
      this.speed_x = 10 - Math.random() * 20;
      this.speed_y = 10 - Math.random() * 20;
      this.color = "#ff0";
      this.alpha = 1;
      this.reposition();
      this.reset();
    }

    Particle.prototype.draw = function() {
      ctx.fillStyle = this.color;
      ctx.beginPath();
      ctx.arc(4, 4, 4, 0, Math.PI * 2, true);
      return ctx.fill();
    };

    Particle.prototype.update = function() {
      var acc_x, acc_y;
      acc_x = -spring_constant * (this.x - this.ox) - damping_constant * this.speed_x;
      acc_y = -spring_constant * (this.y - this.oy) - damping_constant * this.speed_y;
      this.speed_x += acc_x;
      this.speed_y += acc_y;
      this.alpha -= 0.019;
      this.scale_x += 0.06;
      this.scale_y += 0.06;
      this.x += this.speed_x;
      this.y += this.speed_y;
      if (this.alpha <= 0) return this.reset();
    };

    Particle.prototype.reset = function() {
      this.alpha = Math.random();
      this.scale_x = this.scale_y = 0;
      return this.color = colors[~~(Math.random() * colors.length)];
    };

    Particle.prototype.reposition = function() {
      var point;
      point = text_array[~~(Math.random() * text_array.length)];
      this.ox = this.x = point.x + ~~(3 + Math.random() * 6);
      return this.oy = this.y = point.y + ~~(3 + Math.random() * 6);
    };

    return Particle;

  })();

  init();

  animate();

}).call(this);

})();
  </script>

  <div id="codepen-footer">

    <a style="color: #f73535 !important;" href="https://codepen.wufoo.com/forms/m7x3r3/def/field14=" onclick="window.open(this.href,  null, 'height=517, width=680, toolbar=0, location=0, status=1, scrollbars=1, resizable=1'); return false">Report Abuse</a>

    &nbsp;

    <a href="/maxw3st/pen/nIJkh" target="_blank">Edit this Pen</a>
  </div>

</body>

</html>

## markup.html
<canvas id=c></canvas>
<span>Try disturbing the particles with mouse</span>

## style.css
body { margin: 0; }
span { position: absolute; top: 15px; left: 5px; color: white; }

	###
	Text masked spring particles
	Author: Kushagra Gour a.k.a. Chin Chang
	###
	# requestanimationframe polyfill
	window.requestAnimFrame = (->
	return window.requestAnimationFrame \|\|
	window.webkitRequestAnimationFrame \|\|
	window.mozRequestAnimationFrame \|\|
	window.oRequestAnimationFrame \|\|
	window.msRequestAnimationFrame \|\|
	(callback) ->
	window.setTimeout callback, 1000 / 60
	)();

	# variables
	canvas = null
	ctx = null
	num_particles = 800
	density = 8
	min_distance = 70
	text_array = []
	display_list = []
	last_time = null
	spring_constant = 0.2
	damping_constant = 0.08
	colors = ['#184DF4', '#F49A03', '#E01730', '#00A415']
	W = window.innerWidth
	H = window.innerHeight

	init = (e) ->
	canvas = document.getElementById 'c'
	ctx = canvas.getContext '2d'
	canvas.width = W
	canvas.height = H
	canvas.addEventListener 'mousemove', onMouseMove

	changeWord 'Koi Mundo'

	# create particles
	if text_array.length
	for i in [0...num_particles]
	display_list.push new Particle

	getTextArray = (ox, oy, w, h) ->
	text_array = []
	data = ctx.getImageData(ox, oy, w, h).data
	for i in [0...h] by density
	for j in [0...w] by density
	linear_index = (i * w + j) * 4
	if data[linear_index + 3] isnt 0
	text_array.push {x: j, y: i}

	return text_array

	onMouseMove = (e) ->
	mx = e.offsetX \|\| e.pageX
	my = e.offsetY \|\| e.pageY
	for child in display_list
	dx = child.x - mx
	dy = child.y - my
	d = Math.sqrt dx * dx + dy * dy
	if d < min_distance
	child.speed_x += dx * 0.05
	child.speed_y += dy * 0.05

	changeWord = (str) ->
	# clear the canvas first
	ctx.clearRect 0, 0, W, H

	# draw the new text
	ctx.fillStyle = "#000"
	ctx.textBaseline = 'top'
	ctx.textAlign = 'center'
	ctx.font = "200px Arial"
	ctx.fillText str, W/2, 0

	# get the text points
	text_array = getTextArray 0, 0, W, H
	for child in display_list
	child.reposition()

	animate = ->
	animationLoop()
	requestAnimFrame animate

	animationLoop = ->
	if !last_time then last_time = (new Date).getTime()
	current_time = (new Date).getTime()
	dt = (current_time - last_time) / 1000
	last_time = current_time
	window.fps = 1 / dt

	draw()
	update()

	draw = ->
	ctx.fillStyle = "#111"
	ctx.fillRect 0, 0, W, H

	for child in display_list
	continue if typeof child.draw isnt 'function'
	ctx.save();
	ctx.translate child.x, child.y unless isNaN child.x or isNaN child.y
	ctx.scale child.scale_x, child.scale_y unless isNaN child.scale_x or isNaN child.scale_y
	ctx.globalAlpha = child.alpha unless isNaN child.alpha
	child.draw()
	ctx.restore();

	update = ->
	# update particles
	for child in display_list
	child.update() if typeof child.update is 'function'

	class Particle
	constructor: (@radius = 1, @x = Math.random() * W, @y = Math.random() * H) ->
	@speed_x = 10 - Math.random() * 20
	@speed_y = 10 - Math.random() * 20
	@color = "#ff0"
	@alpha = 1
	@reposition()
	@reset()

	draw: ->
	#ctx.drawImage canvas2, 0, 0
	ctx.fillStyle = @color
	ctx.beginPath()
	ctx.arc 4, 4, 4, 0, Math.PI*2, true
	ctx.fill()

	update: ->
	acc_x = -spring_constant * (@x - @ox) - damping_constant * @speed_x
	acc_y = -spring_constant * (@y - @oy) - damping_constant * @speed_y
	@speed_x += acc_x
	@speed_y += acc_y
	@alpha -= 0.019
	@scale_x += 0.06
	@scale_y += 0.06
	@x += @speed_x
	@y += @speed_y

	if @alpha <= 0
	@reset()

	reset: ->
	@alpha = Math.random()
	@scale_x = @scale_y = 0
	@color = colors[~~(Math.random() * colors.length)]

	reposition: ->
	point = text_array[~~(Math.random() * text_array.length)]
	@ox = @x = point.x + ~~(3 + Math.random() * 6)
	@oy = @y = point.y + ~~(3 + Math.random() * 6)

	init()
	animate()
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">

	<title>Sppringgy jelly! · CodePen</title>
	<!--
	Copyright (c) 2012 maxw3st, http://codepen.io/maxw3st

	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.
	-->

	<style>
	body { margin: 0; }
	span { position: absolute; top: 15px; left: 5px; color: white; }
	</style>

	<style>
	#codepen-footer, #codepen-footer * {
	-webkit-box-sizing: border-box !important;
	-moz-box-sizing: border-box !important;
	box-sizing: border-box !important;
	}
	#codepen-footer {
	display: block !important;
	position: fixed !important;
	bottom: 0 !important;
	left: 0 !important;
	width: 100% !important;
	padding: 0 10px !important;
	margin: 0 !important;
	height: 30px !important;
	line-height: 30px !important;
	font-size: 12px !important;
	color: #eeeeee !important;
	background-color: #505050 !important;
	text-align: left !important;
	background: -webkit-linear-gradient(top, #505050, #383838) !important;
	background: -moz-linear-gradient(top, #505050, #383838) !important;
	background: -ms-linear-gradient(top, #505050, #383838) !important;
	background: -o-linear-gradient(top, #505050, #383838) !important;
	border-top: 1px solid black !important;
	border-bottom: 1px solid black !important;
	border-radius: 0 !important;
	border-image: none !important;
	box-shadow: inset 0 1px 0 #6e6e6e, 0 2px 2px rgba(0, 0, 0, 0.4) !important;
	z-index: 300 !important;
	font-family: "Lucida Grande", "Lucida Sans Unicode", Tahoma, sans-serif !important;
	letter-spacing: 0 !important;
	word-spacing: normal !important;
	word-spacing: 0 !important;
	-webkit-transform: none !important;
	-moz-transform: none !important;
	-ms-transform: none !important;
	-o-transform: none !important;
	transform: none !important;
	}
	#codepen-footer a {
	color: #a7a7a7 !important;
	text-decoration: none !important;
	text-shadow: none !important;
	border: 0 !important;
	}
	#codepen-footer a:hover {
	color: white !important;
	}
	</style>
	<script>
	// Kill alerts, confirmations and prompts
	// window.alert = function(){}; we're going to allow alerts for now
	window.confirm = function(){};
	window.prompt = function(){};
	window.open = function(){};
	window.print = function(){};
	</script>

	</head>
	<body>

	<canvas id=c></canvas>
	<span>Try disturbing the particles with mouse</span>

	<script>
	(function() {

	/*
	Text masked spring particles
	Author: Kushagra Gour a.k.a. Chin Chang
	*/

	(function() {
	var H, Particle, W, animate, animationLoop, canvas, changeWord, colors, ctx, damping_constant, density, display_list, draw, getTextArray, init, last_time, min_distance, num_particles, onMouseMove, spring_constant, text_array, update;

	window.requestAnimFrame = (function() {
	return window.requestAnimationFrame \|\| window.webkitRequestAnimationFrame \|\| window.mozRequestAnimationFrame \|\| window.oRequestAnimationFrame \|\| window.msRequestAnimationFrame \|\| function(callback) {
	return window.setTimeout(callback, 1000 / 60);
	};
	})();

	canvas = null;

	ctx = null;

	num_particles = 800;

	density = 8;

	min_distance = 70;

	text_array = [];

	display_list = [];

	last_time = null;

	spring_constant = 0.2;

	damping_constant = 0.08;

	colors = ['#184DF4', '#F49A03', '#E01730', '#00A415'];

	W = window.innerWidth;

	H = window.innerHeight;

	init = function(e) {
	var i, _results;
	canvas = document.getElementById('c');
	ctx = canvas.getContext('2d');
	canvas.width = W;
	canvas.height = H;
	canvas.addEventListener('mousemove', onMouseMove);
	changeWord('Koi Mundo');
	if (text_array.length) {
	_results = [];
	for (i = 0; 0 <= num_particles ? i < num_particles : i > num_particles; 0 <= num_particles ? i++ : i--) {
	_results.push(display_list.push(new Particle));
	}
	return _results;
	}
	};

	getTextArray = function(ox, oy, w, h) {
	var data, i, j, linear_index;
	text_array = [];
	data = ctx.getImageData(ox, oy, w, h).data;
	for (i = 0; 0 <= h ? i < h : i > h; i += density) {
	for (j = 0; 0 <= w ? j < w : j > w; j += density) {
	linear_index = (i * w + j) * 4;
	if (data[linear_index + 3] !== 0) {
	text_array.push({
	x: j,
	y: i
	});
	}
	}
	}
	return text_array;
	};

	onMouseMove = function(e) {
	var child, d, dx, dy, mx, my, _i, _len, _results;
	mx = e.offsetX \|\| e.pageX;
	my = e.offsetY \|\| e.pageY;
	_results = [];
	for (_i = 0, _len = display_list.length; _i < _len; _i++) {
	child = display_list[_i];
	dx = child.x - mx;
	dy = child.y - my;
	d = Math.sqrt(dx * dx + dy * dy);
	if (d < min_distance) {
	child.speed_x += dx * 0.05;
	_results.push(child.speed_y += dy * 0.05);
	} else {
	_results.push(void 0);
	}
	}
	return _results;
	};

	changeWord = function(str) {
	var child, _i, _len, _results;
	ctx.clearRect(0, 0, W, H);
	ctx.fillStyle = "#000";
	ctx.textBaseline = 'top';
	ctx.textAlign = 'center';
	ctx.font = "200px Arial";
	ctx.fillText(str, W / 2, 0);
	text_array = getTextArray(0, 0, W, H);
	_results = [];
	for (_i = 0, _len = display_list.length; _i < _len; _i++) {
	child = display_list[_i];
	_results.push(child.reposition());
	}
	return _results;
	};

	animate = function() {
	animationLoop();
	return requestAnimFrame(animate);
	};

	animationLoop = function() {
	var current_time, dt;
	if (!last_time) last_time = (new Date).getTime();
	current_time = (new Date).getTime();
	dt = (current_time - last_time) / 1000;
	last_time = current_time;
	window.fps = 1 / dt;
	draw();
	return update();
	};

	draw = function() {
	var child, _i, _len, _results;
	ctx.fillStyle = "#111";
	ctx.fillRect(0, 0, W, H);
	_results = [];
	for (_i = 0, _len = display_list.length; _i < _len; _i++) {
	child = display_list[_i];
	if (typeof child.draw !== 'function') continue;
	ctx.save();
	if (!isNaN(child.x \|\| isNaN(child.y))) ctx.translate(child.x, child.y);
	if (!isNaN(child.scale_x \|\| isNaN(child.scale_y))) {
	ctx.scale(child.scale_x, child.scale_y);
	}
	if (!isNaN(child.alpha)) ctx.globalAlpha = child.alpha;
	child.draw();
	_results.push(ctx.restore());
	}
	return _results;
	};

	update = function() {
	var child, _i, _len, _results;
	_results = [];
	for (_i = 0, _len = display_list.length; _i < _len; _i++) {
	child = display_list[_i];
	if (typeof child.update === 'function') {
	_results.push(child.update());
	} else {
	_results.push(void 0);
	}
	}
	return _results;
	};

	Particle = (function() {

	function Particle(radius, x, y) {
	this.radius = radius != null ? radius : 1;
	this.x = x != null ? x : Math.random() * W;
	this.y = y != null ? y : Math.random() * H;
	this.speed_x = 10 - Math.random() * 20;
	this.speed_y = 10 - Math.random() * 20;
	this.color = "#ff0";
	this.alpha = 1;
	this.reposition();
	this.reset();
	}

	Particle.prototype.draw = function() {
	ctx.fillStyle = this.color;
	ctx.beginPath();
	ctx.arc(4, 4, 4, 0, Math.PI * 2, true);
	return ctx.fill();
	};

	Particle.prototype.update = function() {
	var acc_x, acc_y;
	acc_x = -spring_constant * (this.x - this.ox) - damping_constant * this.speed_x;
	acc_y = -spring_constant * (this.y - this.oy) - damping_constant * this.speed_y;
	this.speed_x += acc_x;
	this.speed_y += acc_y;
	this.alpha -= 0.019;
	this.scale_x += 0.06;
	this.scale_y += 0.06;
	this.x += this.speed_x;
	this.y += this.speed_y;
	if (this.alpha <= 0) return this.reset();
	};

	Particle.prototype.reset = function() {
	this.alpha = Math.random();
	this.scale_x = this.scale_y = 0;
	return this.color = colors[~~(Math.random() * colors.length)];
	};

	Particle.prototype.reposition = function() {
	var point;
	point = text_array[~~(Math.random() * text_array.length)];
	this.ox = this.x = point.x + ~~(3 + Math.random() * 6);
	return this.oy = this.y = point.y + ~~(3 + Math.random() * 6);
	};

	return Particle;

	})();

	init();

	animate();

	}).call(this);

	})();
	</script>

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