getBounds() {
		if (typeof this._bounds === "undefined") {
			super.getBounds();
			if (this.isFinite()) {
				this.updateBounds();
			} else {
				// e.g. containers or game world can have infinite size
				this._bounds.setMinMax(this.pos.x, this.pos.y, this.width, this.height);
			}
		}
		return this._bounds;
	}
returns the bounding box for this renderable
@returns {Bounds} bounding box Rectangle object