mouse position (Cursor.Position)

Question

I have image 10*10 mult it in factor and loading the image to picturebox I have problem to select the mouse position when I clicking in everywhere over the image the point showing in the corner Upper-left what is the error??

Answer 1

To draw into a zoomed Image of a PictureBox this works fine for me:

float zoom = 7.5f;

public Form1()
{
    InitializeComponent();
    pb1.SizeMode = PictureBoxSizeMode.Zoom;
    pb1.ClientSize = new Size((int) (pb1.Image.Size.Width  * zoom), 
                              (int) (pb1.Image.Size.Height * zoom) );
}



private void pb1_MouseClick(object sender, MouseEventArgs e)
{
   int x = (int)Math.Round(e.X / zoom) ;
   int y = (int)Math.Round(e.Y / zoom) ;
   Bitmap bmp = (Bitmap) pb1.Image;
   bmp.SetPixel(x, y, Color.Red);
   pb1.Refresh();
}

Note: This works equally well if the PictureBox is sitting in an AutoScroll Panel.