arc( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

		const x0 = this.currentPoint.x;
		const y0 = this.currentPoint.y;

		this.absarc( aX + x0, aY + y0, aRadius,
			aStartAngle, aEndAngle, aClockwise );

		return this;

	}
Adds an arc as an instance of {@link EllipseCurve} to the path, positioned relative
to the current point.

@param {number} aX - The x coordinate of the center of the arc offsetted from the previous curve.
@param {number} aY - The y coordinate of the center of the arc offsetted from the previous curve.
@param {number} aRadius - The radius of the arc.
@param {number} aStartAngle - The start angle in radians.
@param {number} aEndAngle - The end angle in radians.
@param {boolean} [aClockwise=false] - Whether to sweep the arc clockwise or not.
@return {Path} A reference to this path.