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                <body>
  
  	<div id="controls">
			<span>
			
				<h1>RAINBOWBALLZ</h1>
				
				<p>Drag your mouse around. Move sliders to adjust effects. Click to toggle painting mode on/off. (No sliders in Firefox, sorry!)</p>
				
				<p>
					<label>Ball count</label>
					<input class="controller" name="COLS" type="range" min="5" max="70" value="50">
				</p>
				
				<p>
					<label>Effect radius</label>
					<input class="controller" name="MOUSE_RADIUS" type="range" min="100" max="500" value="200">
				</p>
				
				<p>
					<label>Effect strength</label>
					<input class="controller" name="EFFECT_STRENGTH" type="range" min="1" max="20" value="2">
				</p>
								
				<p>
					<label>Min size</label>
					<input class="controller" name="MIN_RADIUS" type="range" min="0" max="50" value="0.5">
				</p>
				
				<p>
					<label>Line thickness</label>
					<input class="controller" name="LINE_WIDTH" type="range" min="1" max="5" value="1">
				</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/rainbowballz" 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=Luckiest+Guy");
@import url("https://fonts.googleapis.com/css?family=Carrois+Gothic");

html, body {
  -webkit-font-smoothing: antialiased;
	font: normal 12px/14px 'Carrois Gothic', sans-serif;
	width: 100%;
	height: 100%;
	margin: 0;
	overflow: hidden;
}

span {
	display: inline-block;
	color: white;
	background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(255,0,0,1)), color-stop(6%,rgba(255,93,0,1)), color-stop(12%,rgba(255,187,0,1)), color-stop(18%,rgba(229,255,0,1)), color-stop(24%,rgba(136,255,0,1)), color-stop(30%,rgba(42,255,0,1)), color-stop(36%,rgba(0,255,51,1)), color-stop(42%,rgba(0,255,144,1)), color-stop(48%,rgba(0,255,233,1)), color-stop(54%,rgba(0,187,255,1)), color-stop(60%,rgba(0,93,255,1)), color-stop(66%,rgba(0,0,255,1)), color-stop(72%,rgba(93,0,255,1)), color-stop(78%,rgba(187,0,255,1)), color-stop(84%,rgba(255,0,229,1)), color-stop(90%,rgba(255,0,131,1)), color-stop(95%,rgba(255,0,63,1)), color-stop(100%,rgba(255,0,4,1))); /* Chrome,Safari4+ */
	background: -webkit-linear-gradient(left, rgba(255,0,0,1) 0%,rgba(255,93,0,1) 6%,rgba(255,187,0,1) 12%,rgba(229,255,0,1) 18%,rgba(136,255,0,1) 24%,rgba(42,255,0,1) 30%,rgba(0,255,51,1) 36%,rgba(0,255,144,1) 42%,rgba(0,255,233,1) 48%,rgba(0,187,255,1) 54%,rgba(0,93,255,1) 60%,rgba(0,0,255,1) 66%,rgba(93,0,255,1) 72%,rgba(187,0,255,1) 78%,rgba(255,0,229,1) 84%,rgba(255,0,131,1) 90%,rgba(255,0,63,1) 95%,rgba(255,0,4,1) 100%); /* Chrome10+,Safari5.1+ */
	background: linear-gradient(to right, rgba(255,0,0,1) 0%,rgba(255,93,0,1) 6%,rgba(255,187,0,1) 12%,rgba(229,255,0,1) 18%,rgba(136,255,0,1) 24%,rgba(42,255,0,1) 30%,rgba(0,255,51,1) 36%,rgba(0,255,144,1) 42%,rgba(0,255,233,1) 48%,rgba(0,187,255,1) 54%,rgba(0,93,255,1) 60%,rgba(0,0,255,1) 66%,rgba(93,0,255,1) 72%,rgba(187,0,255,1) 78%,rgba(255,0,229,1) 84%,rgba(255,0,131,1) 90%,rgba(255,0,63,1) 95%,rgba(255,0,4,1) 100%); /* W3C */

	-webkit-background-clip: text;
			background-clip: text;
	-webkit-text-fill-color: transparent;
			text-fill-color: transparent;
}
h1 {
	font: normal 34px/28px 'Luckiest Guy', Helvetica, Arial;
	margin: 10px 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 {
	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);
}
            
          
!
            
              var params, ctx, winWidth, winHeight;

var rainbowBallz = function() {

  var canvas = document.createElement('canvas');
		
	winWidth = window.innerWidth;
	winHeight = window.innerHeight;

	canvas.width = winWidth;
	canvas.height = winHeight;

	document.body.appendChild(canvas);

	var c = document.getElementsByTagName('canvas')[0];
	
	ctx = c.getContext('2d');

	var	CANVAS_PADDING = 20,
		clearing = false,
		xCounter = 0,
		yCounter = 0,
		itemWidth,
		rows,
		itemCount,
		hueIncrement,
		satIncrement,
		rMax,
		hue,
		sat,
		x,
		y,
		mouseX = null,
		mouseY = null;

	function refresh(params) {
		var strength, dist;

		itemWidth = (winWidth - (CANVAS_PADDING * 2)) / params.COLS,
		rows = winHeight / itemWidth,
		itemCount = params.COLS * rows,
		hueIncrement = Math.floor(360 / rows),
		satIncrement = Math.floor(100 / params.COLS),
		rMax = ((itemWidth - 4) / 2) + params.MIN_RADIUS;

		if (clearing) {
			ctx.clearRect(0, 0, winWidth, winHeight);
		}

		for (var i = 0; i < itemCount; i++) {

			if (i !== 0 && i % params.COLS === 0) {
				xCounter = 0;
				yCounter += 1;
			}

			hue = hueIncrement * yCounter;
			sat = satIncrement * xCounter;

			x = (CANVAS_PADDING + (xCounter * itemWidth)) + params.MIN_RADIUS + (rMax - params.MIN_RADIUS);
			y = (CANVAS_PADDING + (yCounter * itemWidth)) + params.MIN_RADIUS + (rMax - params.MIN_RADIUS);

			if (mouseX) {
				dist = Math.sqrt( Math.pow((x-mouseX),2) + Math.pow((y-mouseY),2));

				if (dist >= params.MOUSE_RADIUS) {
					r = params.MIN_RADIUS;
					ctx.lineWidth = params.LINE_WIDTH;
				}
				else {
					strength = (params.MOUSE_RADIUS - dist) / params.MOUSE_RADIUS;
					r = ((strength * rMax) * params.EFFECT_STRENGTH) + params.MIN_RADIUS;
					ctx.lineWidth = (strength * 1) + params.LINE_WIDTH;
				}
			}
			else {
				r = params.MIN_RADIUS;
				ctx.lineWidth = params.LINE_WIDTH;
			}

			drawThatShit(hue, sat, x, y, r);

			xCounter += 1;

		}

		xCounter = 0;
		yCounter = 0;
	}

	function drawThatShit (hue, sat, x, y, r) {
		ctx.strokeStyle = 'hsl(' + hue + ', ' + sat + '%, 50%)';
		ctx.beginPath();
		ctx.arc(x, y, r, 0, Math.PI*2, true);
		ctx.stroke();
	}

	function mouse (e) {
		mouseX = e.pageX;
		mouseY = e.pageY;
	}

	function toggleClear () {
		clearing = clearing ? false : true;
	}

	c.addEventListener('mousemove', mouse, false);
	c.addEventListener('mouseup', toggleClear, false);

	setInterval(function() {
		refresh(params);
	}, 1000/60);

};

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

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

		value = +value;
		ctx.clearRect(0, 0, winWidth, winHeight);

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

		params[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);
	}

}

window.onload = function() {

	params = {
		COLS : 50, 				// maybe 5 - 70
		MOUSE_RADIUS : 200, 	// 100 - 1000
		MIN_RADIUS : 0.5, 		// 0 - 100
		LINE_WIDTH : 1, 		// 1 - 5
		EFFECT_STRENGTH : 2 	// 1 - 20
	};

	rainbowBallz();

	eventListenerz();
};
            
          
!
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