heaps shaking

  function shaking(o : h2d.Object, t : Float)
  {
    var b = o.getBounds();

    event.waitUntil(function(dt : Float)
    {
        o.x = (Std.int(t / 0.01) % 2 == 0) ?  b.x + Std.random(2)*5 : b.x - Std.random(2)*5;
        t -= dt;
        if(t <= 0) o.x  = b.x;
        return (t <= 0) ?  true : false;
    });
  }