Move a small Bitmap over a large Bitmap

R

romanhoehne

Newcomer
Joined
Dec 23, 2003
Messages
8
Hi,
I've downloaded some samples for directdraw, but only in directx7 (SpaceBreakout) or I've found some for dx9 in C or C++ on this pages here.
I want to move some small bitmaps (50 times 50 Pixs) with black as transparent color over a map (400 times 400 Pixs visible, 1000 times 1000 virtual). All in mode "display.SetCooperativeLevel(this, CooperativeLevelFlags.Normal);" . FullScreen maybe later...

Are here some good hints in csharp for directx9 here or has someone an example?

Here is, what I have tried so far (the "knight" has still a black Border...):

private void Draw()
....
primary.Draw(destination, offscreen, new Rectangle(i,j,300,300), Microsoft.DirectX.DirectDraw.DrawFlags.Wait, new DrawEffects() ) ;
primary.Draw(destination1, knight, DrawFlags.Wait);

private void CreateSurfaces()
{
display = new Device();
display.SetCooperativeLevel(this, CooperativeLevelFlags.Normal);
SurfaceDescription description = new SurfaceDescription();
description.SurfaceCaps.PrimarySurface = true;
primary = new Surface(description, display);
description.Clear();
clip = new Clipper(display);
clip.Window = this;
primary.Clipper = clip;
description.Clear();
offscreen = new Surface("card.bmp", description, display);
description.Clear();
ColorKey CC = new ColorKey();
CC.ColorSpaceHighValue = 0;
CC.ColorSpaceLowValue = 0;
knight = new Surface("knight.bmp", description, display);
knight.SetColorKey(Microsoft.DirectX.DirectDraw.ColorKeyFlags.SourceDraw, CC);
}

Maybe, I have forgotten something

Best regards
Roman
 
It looks like you've got just about everything, but when you draw your knight, try this:

primary.Draw(destination1, knight, DrawFlags.Wait | DrawFlags.KeySource);

My understanding is that the DrawFlags.KeySource flag tells the Draw() function to use the transparency you set up with your ColorKey.

Hope that helps.

-Hiro_Antagonist
 
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