//Display your code here
var angle = getAngle(this.x + this.width / 2, this.y + this.height / 2, mouse.x, mouse.y);
var l = 0.5 / Math.cos((Math.PI * 2 + angle - Math.PI * 0.25) % (Math.PI * 0.5) - Math.PI * 0.25);
this.px = this.x + this.width / 2 + Math.cos(angle) * l * this.width;
this.py = this.y + this.height / 2 + Math.sin(angle) * l * this.height;