gistfile1.txt

var PIBY2 = Math.PI / 2;
var ToDegrees = 180 / Math.PI;

var x = 50;
var y = 50;

var vx = Math.random() - 0.5;
var vy = Math.random() - 0.5;

function update() {
  vx += Math.random() * 0.5 - 0.25;
  vy += Math.random() * 0.5 - 0.25;

  var newx = x + vx;
  var newy = y + vy;

  var dy = newy - y;
  var dx = newx - x;

  var a = (Math.atan2(dy, dx) + PIBY2) * ToDegrees;  // The new target rotation in degrees
}