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  Image flipping  (Read 1505 times)
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Offline javacoder

Junior Newbie

Java games rock!

« Posted 2002-12-15 13:58:35 »


I'm trying to flip 2D images in java using this code:

g.drawImage (img,
             0, img.getHeight(this), 0,im.getWidth(this),
             0, 0, im.getWidth(this), im.getHeight(this),

This works but it seems not accelerated! Shocked

If I don't flip the image i get 110fps, when I flip it
I get 90fps.

There's another way to do image flipping in the
hardware accelerated way???

Many thanks.
Offline trembovetski

Senior Devvie

If only I knew what I'm talking about!

« Reply #1 - Posted 2002-12-18 04:14:53 »

Unfortunately, currently we do not accelerate such operations.

You can try to cache your flipped image to somewhat improve the speed (so you won't need to flip it on each frame), if that's possible.
Offline javacoder

Junior Newbie

Java games rock!

« Reply #2 - Posted 2002-12-21 05:42:26 »


But the problem is with the flipped image...
I really don't know how to mantain the transparence
of the source image.  :-/

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Offline trembovetski

Senior Devvie

If only I knew what I'm talking about!

« Reply #3 - Posted 2002-12-28 04:28:41 »

I'm sorry, I don't seem to follow your problem. Could you please elaborate a bit more on what you're trying to achieve and what's not working?
Offline Abuse

JGO Knight

Medals: 28

falling into the abyss of reality

« Reply #4 - Posted 2002-12-30 00:21:50 »

I think this is what your looking for javacoder,

To maintain the alpha channel of the source image when drawing an image,
simply set the composite of the destination Graphics context like this :-

void flipImage(Image src, Image dst)
   Graphics2D g2 = (Graphics2D)dst.getGraphics();


   0, src.getHeight(this), 0,src.getWidth(this),
   0, 0, src.getWidth(this), src.getHeight(this),


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