Method point1

CvPlot/examples/DoublePendulum.h:23–25

		}
	}
	cv::Point2d point1() const {
		return { l * sin(t1), l * -cos(t1) };
	}
	cv::Point2d point2() const {
		return point1() + cv::Point2d{ l * sin(t2), l * -cos(t2) };
	}