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                <body>
  	
		<canvas id="canvas"></canvas>
		
		<div id="controls">
			<span>
			
				<h1>spiro</h1>
				
				<p>Click and drag to draw. Move sliders to adjust effects. Double click to clear screen. (No sliders in Firefox, sorry!)</p>
				
				<p>
					<label>Size</label>
					<input class="controller" name="maxSize" type="range" min="50" max="1000" value="500">
				</p>
				
				<p>
					<label>Strength</label>
					<input class="controller" name="lineWidth" type="range" min="0.1" max="40" step="0.5" value="0.5">
				</p>
				
				<p>
					<label>Speed</label>
					<input class="controller" name="speed" type="range" min="1" max="20" value="5">
				</p>
								
				<p>
					<label>Colour</label>
					<input class="controller" name="hue" type="range" min="0" max="360" value="0">
				</p>
				
				<p>
					<label>Mirrors</label>
					<input class="controller" name="mirrors" type="range" min="0" max="2" step="1" value="2">
				</p>

				<p>
					<label>Background</label>
					<input class="bg-slider" type="range" min="0" max="1" step="1" value="0">
				</p>
				
				<p>
					<label>RAINBOWFY</label>
					<input class="controller" name="rainbowfy" type="range" min="0" max="1" step="1" value="0">
				</p>				
			
			</span>
			
			<a href="#" class="toggle-controls" id="open">Open controls</a>
			<a href="#" class="toggle-controls" id="close">Close controls</a>
		</div>		
		
    <a href="https://github.com/neilcarpenter/Spiro" id="ribbon" target="_blank"><img style="position: absolute; top: 0; right: 0; border: 0; z-index: 50;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png" alt="Fork me on GitHub"></a>
    
	</body>
            
          
!
            
              @import url("https://fonts.googleapis.com/css?family=Carrois+Gothic|Russo+One");

html, body {
    -webkit-font-smoothing: antialiased;
    font: normal 12px/14px "Carrois Gothic", sans-serif;
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none; 
}

body {
    -webkit-transition: background-color .5s ease-in-out;
       -moz-transition: background-color .5s ease-in-out;
         -o-transition: background-color .5s ease-in-out;
            transition: background-color .5s ease-in-out;
}

span {
    display: inline-block;
    color: black;
    background: url(http://neilcarpenter.com/demos/canvas/spiro/spiro-bg.jpg) repeat;

    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
            text-fill-color: transparent;
}

h1 {
    font: normal 50px/50px "Russo One", Helvetica, Arial;
    text-transform: uppercase;
    margin: 0;
    text-align: center;

}

#controls {
    background: rgba(0, 0, 0, 0.8);
    position: fixed;
    top: 0;
    left: 20px;
    width: 250px;
    padding: 20px;
    -webkit-transform-origin: top center;
       -moz-transform-origin: top center;
         -o-transform-origin: top center;
            transform-origin: top center;
    -webkit-transform: rotate(0deg);
       -moz-transform: rotate(0deg);
         -o-transform: rotate(0deg);
            transform: rotate(0deg);
    -webkit-transition: -webkit-transform .5s ease-in-out;
       -moz-transition:    -moz-transform .5s ease-in-out;
         -o-transition:      -o-transform .5s ease-in-out;
            transition:         transform .5s ease-in-out;
}

#controls.closed {
    -webkit-transform: rotate(-180deg);
       -moz-transform: rotate(-180deg);
         -o-transform: rotate(-180deg);
            transform: rotate(-180deg);
}

.controller,
.bg-slider {
    float: right;
    width: 150px;
}

.toggle-controls {
    position: absolute;
    display: block;
    height: 10px;
    background: rgba(0, 0, 0, 0.9);
    width: 290px;
    left: 0;
    text-align: center;
    padding: 3px 0 7px;
    text-decoration: none;
    color: white;
}

#close {
    bottom: -20px;
}

#open {
    top: -20px;
    -webkit-transform: rotate(180deg);
       -moz-transform: rotate(180deg);
         -o-transform: rotate(180deg);
            transform: rotate(180deg);
}
            
          
!
            
              // http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
 
// requestAnimationFrame polyfill by Erik Möller
// fixes from Paul Irish and Tino Zijdel
 
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); },
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());

var CANVASINGZ = {

  options: {
		maxSize: 500,
		lineWidth: 0.5,
		speed: 5,
		hue: 0,
		mirrors: 2,
		rainbowfy: 0
	},

	animation: null,

	canvas: null,
	context: null,

	winWidth: window.innerWidth,
	winHeight: window.innerHeight,

	mouse: { x: -1000, y: -1000, down: false },
	mousePrev: { x: -1000, y: -1000 },

	degrees: 45,

	init: function () {
		this.canvas = document.getElementById( 'canvas' );
		this.context = canvas.getContext( '2d' );
		this.canvas.width = this.winWidth;
		this.canvas.height = this.winHeight;

		this.canvas.addEventListener('mousemove', this.mouseMove, false);
		this.canvas.addEventListener('mousedown', this.mouseDown, false);
		this.canvas.addEventListener('mouseup', this.mouseUp, false);
		this.canvas.addEventListener('mouseout', this.mouseOut, false);
		this.canvas.addEventListener('dblclick', this.mouseDbl, false);

		this.draw();

	    window.onresize = function () {
			CANVASINGZ.winWidth = window.innerWidth;
			CANVASINGZ.winHeight = window.innerHeight;
			CANVASINGZ.canvas.width = CANVASINGZ.winWidth;
			CANVASINGZ.canvas.height = CANVASINGZ.winHeight;
	    };
	},

	drawLines: function () {
		if (!this.mouse.down) {
			return;
		}

		var distance = Math.sqrt(Math.pow(this.mousePrev.x - this.mouse.x, 2) + Math.pow(this.mousePrev.y - this.mouse.y, 2)),
			r = ((distance / this.winWidth) * 1000) + this.options.maxSize,
			alpha = ((distance / this.winWidth) * 10) + 0.1,
			radians = this.degrees * (Math.PI/180),
			radians2 = (this.degrees + 180) * (Math.PI/180);

		var x1, y1, x2, y2, x3, y3, x4, y4;

		x1 = this.mouse.x + (Math.sin(radians) * r);
		y1 = this.mouse.y + (Math.cos(radians) * r);
		x2 = this.mouse.x + (Math.sin(radians2) * r);
		y2 = this.mouse.y + (Math.cos(radians2) * r);

		x3 = this.winWidth - x1;
		y3 = this.winHeight - y1;
		x4 = this.winWidth - x2;
		y4 = this.winHeight - y2;

		this.context.strokeStyle = 'hsla(' + this.options.hue + ', 100%, 50%, ' + alpha + ')';
		this.context.lineWidth = this.options.lineWidth;
		this.context.beginPath();

        this.context.moveTo(x1,y1);
        this.context.lineTo(x2,y2);

        if (this.options.mirrors > 0) {
			this.context.moveTo(x3,y1);
			this.context.lineTo(x4,y2);

			if (this.options.mirrors > 1) {
				this.context.moveTo(x1,y3);
				this.context.lineTo(x2,y4);

				this.context.moveTo(x3,y3);
				this.context.lineTo(x4,y4);
			}
        }

        this.context.stroke();

		this.degrees += this.options.speed;
		
		// rainbow
		if (this.options.rainbowfy > 0) {
			this.options.hue += 10;
			if (this.options.hue > 360) {
				this.options.hue = 0;
			}
		}

	},

	draw: function () {
		this.animation = requestAnimationFrame( function(){ CANVASINGZ.draw(); } );

		this.drawLines();

		this.mousePrev.x = this.mouse.x;
		this.mousePrev.y = this.mouse.y;
	},

	clear: function() {
		this.canvas.width = this.canvas.width;
	},

	mouseMove: function (e) {
		CANVASINGZ.mouse.x = e.offsetX || (e.layerX - CANVASINGZ.canvas.offsetLeft);
		CANVASINGZ.mouse.y = e.offsetY || (e.layerY - CANVASINGZ.canvas.offsetTop);
	},

	mouseDown: function () {
		CANVASINGZ.mouse.down = true;
	},

	mouseUp: function () {
		CANVASINGZ.mouse.down = false;
	},

	mouseOut: function () {
		CANVASINGZ.mouse.down = false;
	},

	mouseDbl: function () {
		CANVASINGZ.clear();
	}

};

function eventListenerz() {
	var inputs = document.getElementsByClassName('controller');

	function onChange() {
		var name = this.name,
			value = this.value,
			max = this.getAttribute('max');

		value = +value;

		if (value > max) {
			value = max;
			this.value = max;
		}

		CANVASINGZ.options[name] = value;

	}

	for (var i = 0; i < inputs.length; i++) {
		inputs[i].addEventListener('change', onChange, false);
	}

	var controlToggles = document.getElementsByClassName('toggle-controls'),
		controls = document.getElementById('controls');

	function toggleControls(e) {
		e.preventDefault();
		controls.className = controls.className === 'closed' ? '' : 'closed';
	}

	for (var j = 0; j < 2; j++) {
		controlToggles[j].addEventListener('click', toggleControls, false);
	}

	var bgToggle = document.getElementsByClassName('bg-slider')[0];
		bgToggle.addEventListener('change', changeBG, false);

	function changeBG() {
		var value = this.value;

		document.body.style.backgroundColor = 'rgba(0, 0, 0, ' + value + ')';
	}

}

window.onload = function() {

	CANVASINGZ.init();

	eventListenerz();

}
            
          
!
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