点是否在圆内

/// <summary>
        /// 点是否在圆内(在边上也认为在圆内)
        /// </summary>
        /// <param name="cPoint">圆心坐标</param>
        /// <param name="cRadius">圆半径</param>
        /// <param name="point">当前点</param>
        /// <returns></returns>
        public static bool 点是否在圆内(Vector2D cPoint, double cRadius, Vector2D point)
        {
            double distance = Math.Sqrt(Math.Pow(Math.Abs(point.X - cPoint.X), 2) + Math.Pow(Math.Abs(point.Y - cPoint.Y), 2));
            return distance <= cRadius;
        }

        /// <summary>
        /// 点是否在圆内(在边上也认为在圆内)
        /// </summary>
        /// <param name="cPoint">圆心坐标</param>
        /// <param name="onPoint">圆边上坐标</param>
        /// <param name="point">当前点</param>
        /// <returns></returns>
        public static bool 点是否在圆内(Vector2D cPoint, Vector2D onPoint, Vector2D point)
        {
            double cRadius = Math.Sqrt(Math.Pow(Math.Abs(onPoint.X - cPoint.X), 2) + Math.Pow(Math.Abs(onPoint.Y - cPoint.Y), 2));
            double distance = Math.Sqrt(Math.Pow(Math.Abs(point.X - cPoint.X), 2) + Math.Pow(Math.Abs(point.Y - cPoint.Y), 2));
            return distance <= cRadius;
        }