[java] Fast color-switching
Author
Hi
I have a lot of circles.
Inside each circle there is a smaller circle but in a different color.
(The screen is filled up with circles).
The colors are interpolated:
red -> green -> black -> red
Now I want to move this color-schema one step to get a nice effect.
In asm you do this effectively by changing the color in the color-palette (each pixel is pointing to a color in the color-palette).
This way we dont need to set a color of every pixel "by hand".
How do I do this effectively in Java? I want it to be fast.
Is there a way to access each pixel directly and change its color?
Or is there an option like in asm, to change only the color in a palette?
Kind Regards
The people over at http://www.javagaming.org/forums/index.php might be able to answer this. I didn't see any way to alter the palette once it was created using java.awt.image.IndexColorModel.
Author
Hi Jester
I solved it, I think.
Maybe there is a faster solution, but this one is fast enough for me :)
Im using, as you said, an IndexColorModel combined with MemoryImageSource.
I found "MemoryImageSource.newPixels(...)" to update the Image after changing the palette.
Kind Regards
I solved it, I think.
Maybe there is a faster solution, but this one is fast enough for me :)
Im using, as you said, an IndexColorModel combined with MemoryImageSource.
I found "MemoryImageSource.newPixels(...)" to update the Image after changing the palette.
private byte[][] _pal = null;private byte[] _pxs = null; private Image _img = null;private IndexColorModel _icm = null;private MemoryImageSource _src = null; public myConstructor() { // Create source-data for image. _pal = new byte[3][128]; _pxs = new byte[800 * 800]; // Create / Update palette colors. updatePalette(); // Fill "_pixels" with palette-indexes. ... // Setup image. _icm = new IndexColorModel(8, 128, _pal[0], _pal[1], _pal[2]); _src = new MemoryImageSource(800, 800, _icm, _pxs, 0, 800); _src.setAnimated(true); _src.setFullBufferUpdates(true); // Create image. _img = Toolkit.getDefaultToolkit().createImage(_src);} private void updatePalette() { // Update "_pal" colors. ... // Update image. _src.newPixels(_pxs, new IndexColorModel(8, 128, _pal[0], _pal[1], _pal[2]), 0, 800);} public Image getImage() { return _img;}Kind Regards
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