diskpick.html

<!doctype HTML>
<html>
    <head>
        <style>
            canvas{
                border: 1px solid black;
            }
        </style>
        <script src="jquery.js"></script>
        <script>
            var size = 20*4;
            var factor = 45/8;
            var ctx;

            var dot = function(x, y){
                ctx.arc(x*250+250, y*250+250, 2, 0, Math.PI*2, false);
                ctx.fill();
            }
    
            $(function(){
                ctx = $('canvas')[0].getContext('2d');
                for(var i=1; i<33; i++){
                    var s = i/32;
                    var a = Math.sqrt(s*512);
                    var b = Math.sqrt(s);
                    var x = Math.sin(a)*b;
                    var y = Math.cos(a)*b;
                    dot(x, y);
                }
            });
        </script>
    </head>
    <body>
        <canvas width="500" height="500"></canvas>
    </body>
</html>