jugando con p5.js

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<!doctype html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.2.2/p5.min.js"></script>
  </head>
<body>
​
<script>
  function setup() {
    createCanvas(960, 500);
  }
​
  function draw() {
    ellipse(mouseX,mouseY, width-mouseX,height-mouseY);
  }
</script>
​
</body>
</html>
    

Modified http://cdnjs.cloudflare.com/ajax/libs/p5.js/0.2.2/p5.min.js to a secure url

https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.2.2/p5.min.js