how to convert mouse coordinate to bitmap's coordinate?

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I have a picturebox,I could get the mouse's (x,y) from mouse double click event ,but how to conver the (x,y) to bitmap's real (x,y)?

Posted 7-Aug-13 18:14pm

gzdreamway

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Sergey Alexandrovich Kryukov 8-Aug-13 0:16am

Easy, but don't use PictureBox. Why?
—SA

_Maxxx_ 8-Aug-13 1:10am

Perhaps the OP has good reason, perhaps not.
Surely it would be more helpful to let them know the easy answer rather than telling them not to use a PictureBox?

Sergey Alexandrovich Kryukov 8-Aug-13 1:14am

Who knows. Anyway, PictureBox is totally redundant control, so, as soon as anything just a bit mode complex than a static image is needed, using PictureBox becomes impractical, to say the least.
More helpful? Yes, I can help, my comment was just a placeholder. You answer, by the way, is not quite adequate...
—SA

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_Maxxx_ · Answer 1 · 2013-08-07T19:10:00

Solution 1

C#

private void pictureBox1_Click(object sender, EventArgs e)
{
  Point topLeft = PointToScreen(new Point(pictureBox1.Left, pictureBox1.Top));
  int x = MousePosition.X - topLeft.X;
  int y = MousePosition.Y - topLeft.Y;

  MessageBox.Show(string.Format("X{0} Y{1}", x, y));
}

So use PointToScreen to find the coordinates of the picturebox within the screen.

Posted 7-Aug-13 19:10pm

_Maxxx_

Updated 7-Aug-13 19:12pm

v2

Comments

Sergey Alexandrovich Kryukov 8-Aug-13 1:22am

If this is the same image shown in the picture box, these calculations are totally redundant: the bitmap coordinates are exactly the same as control's. Just think about it.
—SA

_Maxxx_ 8-Aug-13 6:00am

I don't see what you mean. The mouse coordinates are relative to the screen while the OP wanted to convert that to the coordinates on the bitmap.
Assuming the image takes up the whole picture box then my calculation is right, isn't it?

I'm sure there are 57 other ways of doing it - but I think my code caters exactly for what the OP requested.

Sergey Alexandrovich Kryukov · Answer 2 · 2013-08-07T19:21:00

Here is the problem: you mention "bitmap coordinates", and don't mention what to click on. If we assume that this is a click on a PictureBox, the pixel coordinates are exactly the same as the coordinates of this control. That's all.

(If your control is different (but why?), you can re-calculate the coordinate translation throw screen coordinates or taking into account control's locations.)

Now, using PictureBox is questionable. It may or may not be useful, but usually not: it creates hassles without any help, only eats additional resources and even more of your development time to be spent for nothing. Please see my past answers:
Append a picture within picturebox[^],
draw a rectangle in C#[^],
How do I clear a panel from old drawing[^].

—SA

how to convert mouse coordinate to bitmap's coordinate?

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how to convert mouse coordinate to bitmap's coordinate?

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