clearRect(x, y, width, height) {
		this.getContext().clearRect(x, y, width, height);
	}
Erase the pixels in the given rectangular area by setting them to transparent black (rgba(0,0,0,0)).
@param {number} x - x axis of the coordinate for the rectangle starting point.
@param {number} y - y axis of the coordinate for the rectangle starting point.
@param {number} width - The rectangle's width.
@param {number} height - The rectangle's height.