setAnimationFrame(index = 0) {
		this.current.idx = index % this.current.length;
		return this.setRegion(
			this.getAnimationFrameObjectByIndex(this.current.idx),
		);
	}
force the current animation frame index.
@param {number} [index=0] - animation frame index
@returns {Sprite} Reference to this object for method chaining
@example
// reset the current animation to the first frame
this.setAnimationFrame();