Jump to content
  • Advertisement
Sign in to follow this  
CodeMachine

[java] Fast color-switching

This topic is 4471 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

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

Share this post


Link to post
Share on other sites
Advertisement
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.


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

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

GameDev.net is your game development community. Create an account for your GameDev Portfolio and participate in the largest developer community in the games industry.

Sign me up!