flipX(flip = true) {
		this._flip.x = !!flip;
		this.isDirty = true;
		return this;
	}
flip the renderable on the horizontal axis (around the center of the renderable)
@see Matrix2d#scaleX
@param {boolean} [flip=true] - `true` to flip this renderable.
@returns {Renderable} Reference to this object for method chaining