var x=Math.min(this.start.x, this.end.x); var y=Math.min(this.start.y, this.end.y); var w=Math.max(this.start.x, this.end.x)-x; var h=Math.max(this.start.y, this.end.y)-y; return { x:x-2, y:y-2, width:w+4, height:h+4 };