Surfaces?

[Guest mutant]

Is it possible to have like 2 layers of graphics in GDI+? I have some image that stays in the background and i dont wish to have to draw it every time paint is fired because i can see the picture get flicker.

[divil]

If you use double-buffering when you draw your control it shouldn't flicker. There isn't a "two layer" thing as you described.

[Guest mutant]

Thats weird, i can get the double buffering to work with shapes, but it doesnt with images :( . Could show me an example for images or point me to some source where I could maybe find a tutorial or some explanation? Couldnt find any.

[divil]

I've never had a problem using double-buffering when drawing images. Can you post a sample that illustrates the problem?

[Guest mutant]

I found a sample on internet.

       Dim bmp As New Bitmap(30, 30)
       Dim g As Graphics = Graphics.FromImage(bmp)
       g.DrawImage(New Bitmap("image.jpg"), 0, 0)
       Dim x As Integer
       For x = 0 To 5
       e.Graphics.DrawImage(bmp, x * 30, 0)
       Next

Is this correct?

[divil]

That works fine for me - I take it you've enabled the DoubleBuffer and AllPaintingInWmPaint styles for the form/control? Remember you don't have to do anything yourself to get double buffering to work, once you've set those two styles .NET does the rest.

 

As a side note, that code is nasty - it doesn't clean up any of the resources it uses.

[Guest mutant]

Thats funny, no of the articales said that I only need to setstyle to double buffer and .NET will do the rest, they told me to draw images like i showed before. Oh well, at least now its working all right :)