How to find the coordinates of the mouse in the background image winform c#

Question

I have a BufferedGraphics painted in the panel. The image is zoomed in and zoomed out. From this buffered graphic images how can i find the mouse position in the image not in the panel.

  private void panel2_paint(object sender, PaintEventArgs e)
       {
         if (bitmap != null)
            {
                float widthZoomed = panel2.Width / Zoom;
                float heigthZoomed = panel2.Height / Zoom;

                if (widthZoomed > 30000.0f)
                {
                    Zoom = panel2.Width / 30000.0f;
                    widthZoomed = 30000.0f;
                }
                if (heigthZoomed > 30000.0f)
                {
                    Zoom = panel2.Height / 30000.0f;
                    heigthZoomed = 30000.0f;
                }


                if (widthZoomed < 2.0f)
                {
                    Zoom = panel2.Width / 2.0f;
                    widthZoomed = 2.0f;
                }
                if (heigthZoomed < 2.0f)
                {
                    Zoom = panel2.Height / 2.0f;
                    heigthZoomed = 2.0f;
                }

                float wz2 = widthZoomed / 2.0f;
                float hz2 = heigthZoomed / 2.0f;
                Rectangle drawRect = new Rectangle(
                    (int)(viewPortCenter.X - wz2),
                    (int)(viewPortCenter.Y - hz2),
                    (int)(widthZoomed),
                    (int)(heigthZoomed));
                drawrecX = drawRect.X;
                drawrecY = drawRect.Y;
                dispwidth = (int)(widthZoomed);
                dispheight = (int)(heigthZoomed);

                myBuffer.Graphics.Clear(Color.White); //Clear the Back buffer
                Console.WriteLine(this.panel2.DisplayRectangle.Width);
                Console.WriteLine(this.panel2.DisplayRectangle.Height);

                myBuffer.Graphics.DrawImage(bitmap, this.panel2.DisplayRectangle, drawRect, GraphicsUnit.Pixel);
                //pictureBox1.Image =
                myBuffer.Render(this.panel2.CreateGraphics());
                //this.toolStripStatusLabel1.Text = "Zoom: " + ((int)(this.Zoom * 100)).ToString() + "%";
            }  
}

the above code is the paint part. To find the location of the mouse in the image i tried like this

private void panel2_DoubleClick(object sender, EventArgs e)
        {
            var mouseArgs = (MouseEventArgs)e;
            double Pic_width = dispwidth / panel2.Width;//to find the relative position 
            double Pic_height = dispheight / panel2.Height;
            int xpoint = (int)Pic_width * mouseArgs.X + drawrecX;//drawrecX is the X coordinate from the drawing image
            int ypoint = (int)Pic_height * mouseArgs.Y + drawrecY;

        }

but this code does not give me the exact position. any idea?

Answer 1

Try this:

private void panel2_DoubleClick(object sender, EventArgs e)
{        
    var mouseArgs = (MouseEventArgs)e;

    int x = mouseArgs.X - drawrecX;
    int y = mouseArgs.Y - drawrecY;

    var size = ImageSizeWithoutZoom;
    var zoomSize = ImageSizeWithZoom;

    double xPoint = x * size.X / zoomSize.X;
    double yPoint = y * size.Y / zoomSize.Y;
}