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Drawing with c# - smoothly

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NINTENDO
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Posted: Thu Oct 15, 2009 6:38 am Post subject: Drawing with c# - smoothly

Code:

case DrawingMode.rectangle:
this.p.Refresh();
g.DrawRectangle(pen, new Rectangle(prevLoc.X, prevLoc.Y, offsetx, offsety));
break;

How can I turn this into smooth drawing code. Refresh on mouse move makes it flicker ofc becuase it must redraw the shit too many times.
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Odecey
Master Cheater

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Posts: 259
Location: Scandinavia

Posted: Thu Oct 15, 2009 7:56 am Post subject: Re: Drawing with c# - smoothly

JesusLovesQlimax wrote:

Code:

case DrawingMode.rectangle:
this.p.Refresh();
g.DrawRectangle(pen, new Rectangle(prevLoc.X, prevLoc.Y, offsetx, offsety));
break;

How can I turn this into smooth drawing code. Refresh on mouse move makes it flicker ofc becuase it must redraw the shit too many times.

Implementing double buffering should solve this problem. If you are drawing on the form itself, I think it's enough to set the DoubleBuffered property to true.
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hcavolsdsadgadsg
I'm a spammer

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Joined: 11 Jun 2007
Posts: 5801

Posted: Thu Oct 15, 2009 10:06 am Post subject: Re: Drawing with c# - smoothly

JesusLovesQlimax wrote:

Code:

case DrawingMode.rectangle:
this.p.Refresh();
g.DrawRectangle(pen, new Rectangle(prevLoc.X, prevLoc.Y, offsetx, offsety));
break;

How can I turn this into smooth drawing code. Refresh on mouse move makes it flicker ofc becuase it must redraw the shit too many times.

There's a couple things you can do:

1. Handle WM_ERASEBKGND yourself and return TRUE, handle the redraw yourself.

2. Use double buffering. You get flickering because it's hard to make a change to a single buffer without ending up drawing only part of the image.

Pretty sure a memory DC is slow in GDI+, you should use the CachedBitmap class instead.

NINTENDO
Grandmaster Cheater Supreme

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Joined: 02 Nov 2007
Posts: 1371

Posted: Thu Oct 15, 2009 11:52 am Post subject:

the control doesn't have double buffer. I dont wanna draw directly on the form. I would like to draw on a panel or a picturebox, preferably. _________________ Intel over amd yes.

Odecey
Master Cheater

Reputation: 1

Joined: 19 Apr 2007
Posts: 259
Location: Scandinavia

Posted: Fri Oct 16, 2009 3:13 am Post subject:

JesusLovesQlimax wrote:

the control doesn't have double buffer. I dont wanna draw directly on the form.

I would like to draw on a panel or a picturebox, preferably.

Don't flicker, double buffer!

Code:

class DoubleBufferedPictureBox : PictureBox
{
public DoubleBufferedPictureBox()
{
this.SetStyle(
ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.OptimizedDoubleBuffer, true);
}
protected override void OnPaint(PaintEventArgs pe)
{
DrawContent(pe.Graphics);
}
private void DrawContent(Graphics g)
{
// Paint your content here (This includes the control background)
}

}

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Never confuse activity with productivity. You can be busy without a purpose, but what's the point?- Rick Warren

NINTENDO
Grandmaster Cheater Supreme

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Joined: 02 Nov 2007
Posts: 1371

Posted: Fri Oct 16, 2009 7:23 am Post subject:

Odecey wrote:

JesusLovesQlimax wrote:

the control doesn't have double buffer. I dont wanna draw directly on the form.

I would like to draw on a panel or a picturebox, preferably.

Don't flicker, double buffer!

Code:

Thanks.

edit :
OMG it didn't do a damn thing. It still flickers as much as it did before. AllPaintingInWmPaint even made it worse (the shapes just disaper).
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hcavolsdsadgadsg
I'm a spammer

Reputation: 26

Joined: 11 Jun 2007
Posts: 5801

Posted: Fri Oct 16, 2009 4:23 pm Post subject:

something is wrong then, since you shouldn't be flickering if you're double buffering. you can also try handling WM_ERASEBKRND http://msdn.microsoft.com/en-us/library/ms648055%28VS.85%29.aspx

Odecey
Master Cheater

Reputation: 1

Joined: 19 Apr 2007
Posts: 259
Location: Scandinavia

Posted: Sat Oct 17, 2009 9:30 am Post subject:

_________________ Never confuse activity with productivity. You can be busy without a purpose, but what's the point?- Rick Warren

NINTENDO
Grandmaster Cheater Supreme

Reputation: 0

Joined: 02 Nov 2007
Posts: 1371

Posted: Sat Oct 17, 2009 5:44 pm Post subject:

Finally it is solved with double buffering. Thanks alot everyone _________________ Intel over amd yes.

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