keep the graphics

[jin]

Sorry, is there any way that after we draw some line or graphics on the
windows form, after the windows minimized, the line and graphics won't
dissappear?

I'm appreciate for any reply, thank you

[Nicholas Paldino [.NET/C# MVP]]

Re: keep the graphics

Jin,

When paint something on the form, the form doesn't remember what you
painted. Rather, when it needs to, the form repaints itself at regular
intervals.

What you need to do is store the information about where the line should
be drawn on your form. Then, call the Invalidate method on your form. When
you do that, it will cause a repaint. Then, from your form, you would
override the OnPaint method or sign up for the Paint event. Then, in these
methods, you would paint the line on your form according to the information
you stored.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"jin" <jin@discussion s.microsoft.com > wrote in message
news:67DF8A9A-6D02-4D68-A53F-0B1192110850@mi crosoft.com...[color=blue]
> Sorry, is there any way that after we draw some line or graphics on the
> windows form, after the windows minimized, the line and graphics won't
> dissappear?
>
> I'm appreciate for any reply, thank you[/color]

[Bob Powell [MVP]]

Re: keep the graphics

Check out the GDI+ FAQ.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting

http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks

http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ

http://www.bobpowell.net/faqmain.htm

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"jin" <jin@discussion s.microsoft.com > wrote in message
news:67DF8A9A-6D02-4D68-A53F-0B1192110850@mi crosoft.com...[color=blue]
> Sorry, is there any way that after we draw some line or graphics on the
> windows form, after the windows minimized, the line and graphics won't
> dissappear?
>
> I'm appreciate for any reply, thank you[/color]

[g18c@hotmail.com]

Re: keep the graphics

I've done this before (with MFC but still applies here) by overriding
the OnPaint method, and blit a bitmap to the screen. If the user had
changed any of the application data i would need to re-render the
bitmap before letting OnPaint display it (instead it just showed a
rendering message). Bitmaps are a good way of caching if the drawing
process is intensive.

Hope this helps

Chris