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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <div id="control-panel">
<p>Click and drag to make more!</p>
<label>Trails: </label>
<input type="checkbox" id="trail" name="trail" checked />
<button id="clear">Clear</button>
<a href="https://codepen.io/jackrugile/pen/aCzHs" target="_blank">View Version 2</a>
<canvas id="c"></canvas>
              body {
  background: #000;
  color: #aaa;
  font: 100%/20px helvetica, arial, sans-serif;

canvas {
  display: block;
  height: 100%;
  left: 0;
  margin: 0;
  padding: 0;
  position: absolute;
  top: 0;
  width: 100%

#control-panel {
  background: rgba(0,0,0,.75);
  border: 1px solid #333;
  left: 20px;
  padding: 10px 15px;
  position: absolute;
  top: 20px;
  z-index: 2;

p {
	font-size: 12px;
  margin: 0 0 5px;

label {
  font-size: 12px;
  font-weight: bold;

button {
  display: block; 
  margin: 10px 0 5px;

a {
  border-bottom: 1px dotted #444;
  color: #fff;
  font-size: 12px;
  text-decoration: none;
              window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();

document.onselectstart = function() {
  return false;
var c = document.getElementById('c');
var ctx = c.getContext('2d');
var dpr = window.devicePixelRatio;
var cw = window.innerWidth;
var ch = window.innerHeight;
c.width = cw * dpr;
c.height = ch * dpr;
ctx.scale(dpr, dpr);
var rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);}
ctx.lineCap = 'round';
var orbs = [];
var orbCount = 30;
var radius;

var trailCB = document.getElementById('trail');
var trail = trailCB.checked;
var clearer = document.getElementById('clear');

function createOrb(mx,my){
  var dx = (cw/2) - mx;
	var dy = (ch/2) - my;
	var dist = Math.sqrt(dx * dx + dy * dy);
	var angle = Math.atan2(dy, dx);
		x: mx,
		y: my,
		lastX: mx,
		lastY: my,
		hue: 0,
		colorAngle: 0,
		angle: angle + Math.PI/2,
		//size: .5+dist/250,
		size: rand(1,3)/2,
		centerX: cw/2,
		centerY: ch/2,		
		radius: dist,
		speed: (rand(5,10)/1000)*(dist/750)+.015,
		alpha: 1 - Math.abs(dist)/cw,
		draw: function() {			
			ctx.strokeStyle = 'hsla('+this.colorAngle+',100%,50%,1)';	
			ctx.lineWidth = this.size;			
			ctx.moveTo(this.lastX, this.lastY);
			ctx.lineTo(this.x, this.y);
		update: function(){
			var mx = this.x;
			var my = this.y;	
			this.lastX = this.x;
			this.lastY = this.y;
			var x1 = cw/2;
			var y1 = ch/2;
			var x2 = mx;
			var y2 = my;		
			var rise = y1-y2;
			var run = x1-x2;
			var slope = -(rise/run);
			var radian = Math.atan(slope);
			var angleH = Math.floor(radian*(180/Math.PI));		
			if(x2 < x1 && y2 < y1){angleH += 180;}		
			if(x2 < x1 && y2 > y1){angleH += 180;}		
			if(x2 > x1 && y2 > y1){angleH += 360;}		
			if(y2 < y1 && slope =='-Infinity'){angleH = 90;}		
			if(y2 > y1 && slope =='Infinity'){angleH = 270;}		
			if(x2 < x1 && slope =='0'){angleH = 180;}
			if(isNaN(angleH)){angleH = 0;}
			this.colorAngle = angleH;
			this.x = this.centerX + Math.sin(this.angle*-1) * this.radius;
			this.y = this.centerY + Math.cos(this.angle*-1) * this.radius;
			this.angle += this.speed;

function orbGo(e){
	var mx = e.pageX - c.offsetLeft;
	var my = e.pageY - c.offsetTop;		

function turnOnMove(){
	c.addEventListener('mousemove', orbGo, false);	

function turnOffMove(){
	c.removeEventListener('mousemove', orbGo, false);	

function toggleTrails(){
	trail = trailCB.checked;

function clear(){
 orbs = []; 

c.addEventListener('mousedown', orbGo, false);
c.addEventListener('mousedown', turnOnMove, false);
c.addEventListener('mouseup', turnOffMove, false);
trailCB.addEventListener('change', toggleTrails, false);
clearer.addEventListener('click', clear, false);

var count = 100;
		createOrb(cw/2, ch/2+(count*2));

var loop = function(){
		ctx.fillStyle = 'rgba(0,0,0,.1)';
	} else {
	var i = orbs.length;
		var orb = orbs[i];	
		var updateCount = 3;

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