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Miraplacid Forum >> Software Development >> C# DOTNET Animation - Need Double BufferingModerator:XMan

Author Topic:  C# DOTNET Animation - Need Double Buffering
Sly
Member

From: Canada
posted 2004-05-08 07:35:16 Reply -Delete

I have written a program on C# .NET
There is a panel and OnPaint handler.
I invalidate it OnTimer, so it is kind of animation.
The problem is - it is blinking. I guess I need some nind os double buffering.
I set mypanel.SetStyle UserPaint, AllPaintingInWmPaint, and DoubleBuffer just like
MSDN recommends. It helps a bit on Win2000 and XP, but does not help on Win98.
I know how to implement the double buffering in the regular Win32 GDI (using Device Context)
So should I call Graphics.GetHdc and do something with it? How?

theory
Member

From: Suomi
posted 2004-05-08 08:48:27 Reply -Delete

Built-in DOTNET double buffering is suxx. No, you do not need GetHdc.
Instead, you need a bitmap object.
First, add a bitmap object to your class

private Bitmap m_bmp;

Then create it in Form_Load (make sute it fit to your panel)

m_bmp=new Bitmap(panel_width,panel_height);

then in panel_Paint

Graphics g=e.Graphics;
Graphics gm=Graphics.FromImage(m_bmp);

gm.Clear(Color.White); // or whatever your background is
gm.FillRectangle(Brushes.black,my_rect); // make your drawing here

g.DrawImageUnscaled(m_bmp,0,0);
gm.Dispose();

Sly
Member

From: Canada
posted 2004-05-08 09:25:57 Reply -Delete

Are you sure? It is blinking even more!

theory
Member

From: Suomi
posted 2004-05-08 09:53:58 Reply -Delete

May be it is background re-painting...

Try this:

- add class

public class NoBackPanel : Panel {
protected override void OnPaintBackground(PaintEventArgs pevent)
{
//Don't allow the background to paint
}
}
- change your panel type from Panel to NoBackPanel

this.m_panel = new NoBackPanel(); //System.Windows.Forms.Panel();

Sly
Member

From: Canada
posted 2004-05-08 10:21:46 Reply -Delete

Wow! Thank you! Wonderful!

tunde
Member

From: nigeria
Web-page
Email
posted 2006-07-12 11:19:04 Reply -Delete

well i like suomi's stuff
but mine is rather different
i tried to make a dynamic movement of my label.text object by decrementing label.location.x parameter using a timer object
the label is moving vertically as required but i noticed a flikering\blinking effect
how do i control this
what is it about double buffering
suggest any possible approach

Yancho
Member

Email
posted 2007-12-20 19:37:24 Reply -Delete

this.SetStyle(
ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.DoubleBuffer, true
);

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