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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<style id="jsbin-css">
canvas {
  width: 100%;
  height: 100%
}
</style>
</head>
<body>
  <canvas id="canvas"></canvas>
<script id="jsbin-javascript">
var canvas = document.getElementById("canvas");
  var ctx = canvas.getContext('2d');
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
ctx.fillStyle = "red";
var s = 1;
var d = 0;
setInterval(function() {
	ctx.clearRect(0, 0, canvas.width, canvas.height);
	d+=0.1;
	s = Math.sin(d)/2+0.5;
	for(var t=-Math.PI; t<Math.PI; t+=Math.PI/36) {
		var x = (1-s)*Math.cos(t)+s*Math.cos(t)*(1/Math.max(Math.abs(Math.sin(t)),Math.abs(Math.cos(t))));
		var y = (1-s)*Math.sin(t)+s*Math.sin(t)*(1/Math.max(Math.abs(Math.sin(t)),Math.abs(Math.cos(t))));
ctx.fillRect(canvas.width/2+x*100, canvas.height/2+y*100, 5, 5);
	}
}, 1000/30);
</script>


<script id="jsbin-source-css" type="text/css">canvas {
  width: 100%;
  height: 100%
}</script>

<script id="jsbin-source-javascript" type="text/javascript">
  var canvas = document.getElementById("canvas");
  var ctx = canvas.getContext('2d');
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
ctx.fillStyle = "red";
var s = 1;
var d = 0;
setInterval(function() {
	ctx.clearRect(0, 0, canvas.width, canvas.height);
	d+=0.1;
	s = Math.sin(d)/2+0.5;
	for(var t=-Math.PI; t<Math.PI; t+=Math.PI/36) {
		var x = (1-s)*Math.cos(t)+s*Math.cos(t)*(1/Math.max(Math.abs(Math.sin(t)),Math.abs(Math.cos(t))));
		var y = (1-s)*Math.sin(t)+s*Math.sin(t)*(1/Math.max(Math.abs(Math.sin(t)),Math.abs(Math.cos(t))));
ctx.fillRect(canvas.width/2+x*100, canvas.height/2+y*100, 5, 5);
	}
}, 1000/30);</script></body>
</html>