Bad flicker effects in interactive mode

[Sternchen]

Hi,
I wrote an application where you can create your own graph by adding
curve points into a coordinate system grid. The grid is placed on a
panel. Also you can pick the control points and drag them to another
spot. If I do so, I get such a bad flicker effect (only in the panel)
and sometimes the whole background is blank.

In my MouseMove method I do all the interactive stuff and update the
panel with panel.Invalidate().
Any idea?

Cheers

 

[Fabien]

Hi,

Try to use Double Buffering : http://www.codeproject.com/KB/mobile/CfSymmerty.aspx

BR

Fabien Decret (Device Application Development MVP)
Windows Embedded Consultant

ADENEO (ADESET)
http://www.adeneo.adetelgroup.com/ | http://fabdecret.blogspot.com/

 

[Sternchen]

Thank you for your tip. Since I want to paint on the panel I use the
PaintEventArgs to create the graphics and it still flickers then. Do
you think that might be the reason?

I do following now:

private void PaintTF(object sender, PaintEventArgs e)
{

Graphics g = e.Graphics;

Graphics.FromImage(myBitmap).Clear(System.Drawing.Color.LightGray);
Graphics bufferedGraphics =
Graphics.FromImage(myBufferBitmap);
bufferedGraphics.DrawImage(myBitmap, 0, 0);

bufferedGraphics.DrawAllTheStuff....

g.DrawImage(myBufferBitmap, 0, 0);
bufferedGraphics.Dispose();
}


Cheers

 

[dbgrick]

Override the background paint method and comment out any UI added code.
Since you are painting the entire screen yourself, you don't need the
background paint.

Regards,
Rick D.