x and y coordinates of a point in a picture

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Hi I get x and y coordinates of a point in an image in a picturebox by mouse move event but when I draw a line with them the line is drawn in another point.why?

C#

private void pictureBox2_MouseMove(object sender, MouseEventArgs e)
        {
          toolStripStatusLabel2.Text = "X:" + e.X + "," + "Y:" + e.Y;
        }

C#

private void button2_Click(object sender, EventArgs e)
       {

......

MIDL

pictureBox2.Height = 3152;
pictureBox2.Width = 4760;
Graphics g = Graphics.FromImage(pictureBox2.Image);
Pen p = new Pen(Color.Black,9);
g.DrawEllipse(p,m,n,20,20);
pictureBox2.Invalidate();

}

Posted 2-Jul-11 2:53am

Member 7965041

Updated 2-Jul-11 4:01am

v2

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Shahin Khorshidnia 2-Jul-11 8:59am

Windows, WPF ?
I must read the code too.

Member 7965041 2-Jul-11 9:37am

windows form.
Is it possible : the point that I get from mouse differs from the point of my image?

Sergey Alexandrovich Kryukov 2-Jul-11 20:09pm

No! Add tag "Forms" to your question. Some code?
--SA

3 solutions

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VallarasuS · Answer 1 · 2011-07-02T07:08:00

Solution 3

the event args might be in screen co-ordinates, you should convert them into client co-ordinates before using them.

for instance,

Point newPt = pictureBox.PointToClient(point);

Hope this helps.

Posted 2-Jul-11 7:08am

VallarasuS

Comments

RaviRanjanKr 2-Jul-11 14:28pm

Nice Suggestion, My 5 :)

Sergey Alexandrovich Kryukov 2-Jul-11 20:16pm

Well, let's get to the root of the problem: PictureBox should not be used.
Please see my solution.
--SA

Sergey Alexandrovich Kryukov · Answer 2 · 2011-07-02T14:14:00

Solution 4

Drawing interactively on PictureBox makes little sense, as most of the thing people try to do with this component. You really need to draw on custom control (derived from System.Windows.Forms.Control), Panel, even on Form, but not on PictureBox. You can even save the image after interactive drawing if you abstract out the rendering method (by drawing on other media such as System.Drawing.Bitmap and saving it).

To read about how to do it, please see my past answer:
How do I clear a panel from old drawing[^].

—SA

Posted 2-Jul-11 14:14pm

Sergey Alexandrovich Kryukov

Comments

VallarasuS 3-Jul-11 3:26am

The painting actually happens with-in the bitmap context, and is most widely used to create complex bitmaps!, PictureBox just being invalidated when required. (ting)!! Do you think is necessary to extend / create a custom control?

Sergey Alexandrovich Kryukov 3-Jul-11 3:41am

No! I explained it in the answer references.

One can use Panel or Form. Well, "extend", a big deal!
You need to sub-class a control to switch on double buffering, that's pretty much it. PictureBox is the worse solution. It is used to create bitmaps, yes, but only static ones. If you want to move some objects within it, it's the evil. Come on, so many projects are done correctly, no one uses the PictureBox for rendering anything interactive or animated. It only creates extra hassles (like the one OP is having now), adds no value at all.

There are many answers on CodeProject discouraging doing it.
--SA

Sergey Chepurin · Answer 3 · 2011-07-02T05:44:00

Solution 2

You may compare with this VB.NET (tested) and its C# analog (not tested) drawing by mouse program.

Posted 2-Jul-11 5:44am

Sergey Chepurin

Comments

Sergey Alexandrovich Kryukov 2-Jul-11 20:15pm

It makes little sense (I did not vote).
Well, let's get to the root of the problem: PictureBox should not be used.
Please see my solution.
--SA