Function circle

	static void CL_Draw::circle(
		CL_GraphicContext  gc,
		double center_x,
		double center_y,
		double radius,
		const CL_Colord & color);

	static void CL_Draw::circle(
		CL_GraphicContext  gc,
		const CL_Pointd & center,
		double radius,
		const CL_Colord & color);