joint.all.js
function(r) {
	    this.x += r.x;
	    this.y += r.y;
	    this.width += r.width;
	    this.height += r.height;
	    return this;
        }
function(r) {
	    this.x += r.x;
	    this.y += r.y;
	    this.width += r.width;
	    this.height += r.height;
	    return this;
        }
Move and expand me. @param r {rectangle} representing deltas