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  Transform Color Transparent!  (Read 860 times)
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Offline alvosul

Junior Newbie




Java games rock!


« Posted 2003-01-28 17:20:33 »

How do I set a transparent color in a picture?  Grin
Offline cogumbreiro

Junior Newbie




Java games rock!


« Reply #1 - Posted 2003-01-29 02:29:15 »

Here you go, have fun Wink :
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      /**
       * Gets the image pixels in a one dimension array
       * @param img the original image
       * @return int[] the image's pixels
       */

      public static final int[] getPixels(Image img) {
            final int[] pix = new int[img.getWidth(null) * img.getHeight(null)];
            final PixelGrabber pg =
                  new PixelGrabber(
                        img,
                        0,
                        0,
                        img.getWidth(null),
                        img.getHeight(null),
                        pix,
                        0,
                        img.getWidth(null));
            try {
                  pg.grabPixels();
            } catch (InterruptedException e) {
            }
            return pix;
      }
      /**
       * Converts a unidimensional array of pixels into an image
       * @param pixels the image's pixels
       * @param w the image width
       * @param h the image height
       * @return Image the resulting image
       */

      public static final Image getImage(int[] pixels, int w, int h) {
            return Toolkit.getDefaultToolkit().createImage(
                  new MemoryImageSource(w, h, pixels, 0, w));
      }

      /**
       * This applies an alpha mask, removing all images coicident to argument's
       * Color. This doesn't alter the original image.
       * @param img the image you want to transform
       * @param keyColor the color you want to become invisible
       * @return Image the resulting image
       */

      public static final Image applyKeyColorMask(Image img, Color keyColor) {
            final int w = img.getWidth(null);
            final int h = img.getHeight(null);
            final int[] pxls = getPixels(img);
            final int blank = new Color(255, 0, 0, 0).getRGB();
            for (int i = 0; i < pxls.length; i++) {
                  if (pxls[i] == keyColor.getRGB()) {
                        pxls[i] = blank;
                  }
            }
            return getImage(pxls, w, h);
      }
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Play Revenge of the Titans! The situation is critical. We need fancy commanders to defend Earth, the moon, Mars!
 
Play Revenge of the Titans! The situation is critical. We need fancy commanders to defend Earth, the moon, Mars and Titan!

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