C# สอบถามหน่อยครับ ผมทำpicturebox zoomแบบมีScrollbar แต่พิกัดกับรูปที่ Zoom ไม่ตรงกับที่เมาส์ชี้ พอมีวิธีแก้ไหมครับ

private void ShowCoords(Int32 mouseX, Int32 mouseY) 
        {

            Int32 realW = pictureEdit1.Image.Width; 
            Int32 realH = pictureEdit1.Image.Height;

            Int32 currentW = pictureEdit1.ClientRectangle.Width;
            Int32 currentH = pictureEdit1.ClientRectangle.Height;
            Double zoomW = (currentW / (Double)realW);
            Double zoomH = (currentH / (Double)realH);
            Double zoomActual = Math.Min(zoomW, zoomH); /
            Double padX = zoomActual == zoomW ? 0 : (currentW - (zoomActual * realW)) / 2;
            Double padY = zoomActual == zoomH ? 0 : (currentH - (zoomActual * realH)) / 2;

             Int32 realX = (Int32)((mouseX - padX) / zoomActual);
             Int32 realY = (Int32)((mouseY - padY) / zoomActual);
            
            
            CC.Text = "Real --> X : " + realX + "Y : " + realY;
         
        }

 private void UpdateZoomedImage(int x , int y)
        {
            int ax = x - 7;
            int by = y - 7;
           
            int zoomWidth = picZoom.Width / _ZoomFactor;
            int zoomHeight = picZoom.Height / _ZoomFactor;

           
            int halfWidth = zoomWidth / 2;
            int halfHeight = zoomHeight / 2;

            
            Bitmap tempBitmap = new Bitmap(zoomWidth, zoomHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

           
            Graphics bmGraphics = Graphics.FromImage(tempBitmap);

           
            bmGraphics.Clear(_BackColor);

            
            bmGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

           
           
            bmGraphics.DrawImage(pictureEdit1.Image, new Rectangle(0, 0, zoomWidth, zoomHeight), new Rectangle(ax, by, zoomWidth, zoomHeight), GraphicsUnit.Pixel);


            
            picZoom.Image = tempBitmap; 

            // Draw a crosshair on the bitmap to simulate the cursor position
            bmGraphics.DrawLine(Pens.Aqua, halfWidth + 0, halfHeight - 4, halfWidth + 0, halfHeight - 2); //บน
            bmGraphics.DrawLine(Pens.Aqua, halfWidth + 0, halfHeight + 4, halfWidth + 0, halfHeight + 2); //ล่าง
            bmGraphics.DrawLine(Pens.Aqua, halfWidth - 4, halfHeight + 0, halfWidth - 2, halfHeight + 0); //ซ้าย
            bmGraphics.DrawLine(Pens.Aqua, halfWidth + 4, halfHeight + 0, halfWidth + 2, halfHeight + 0); //ขวา
         
            
            bmGraphics.Dispose();

           
            picZoom.Refresh();
        }

// lblCo คือคอนโทรล Label ที่ใช้แสดงพิกัด X, Y
lblCo.Text = String.Format("x: {0:n0}, y: {1:n0}", e.X, e.Y);

picImage.SizeMode = PictureBoxSizeMode.CenterImage;
picZoom.SizeMode = PictureBoxSizeMode.StretchImage;