C# PictureBox 获取光标相对于于图片的像素坐标

        private void GetImagePixLocation(System.Drawing.Size pictureBoxSize, System.Drawing.Size imageSize, System.Drawing.Point pictureBoxPoint, out System.Drawing.Point imagePoint)
        {

            imagePoint = new System.Drawing.Point(0, 0);

            double scale;

            int detalInHeight = 0;

            int detalInWidth = 0;

            if (Convert.ToDouble(pictureBoxSize.Width) / pictureBoxSize.Height > Convert.ToDouble(imageSize.Width) / imageSize.Height)
            {
                scale = 1.0 * imageSize.Height / pictureBoxSize.Height;
                detalInWidth = Convert.ToInt32((pictureBoxSize.Width * scale - imageSize.Width) / 2.0);
            }

            else
            {
                scale = 1.0 * imageSize.Width / pictureBoxSize.Width;
                detalInHeight = Convert.ToInt32((pictureBoxSize.Height * scale - imageSize.Height) / 2.0);
            }

            imagePoint.X = Convert.ToInt32(pictureBoxPoint.X * scale - detalInWidth);

            imagePoint.Y = Convert.ToInt32(pictureBoxPoint.Y * scale - detalInHeight);

        }