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  Crop transparent image  (Read 757 times)
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Offline luisoft

JGO Coder


Projects: 6


Java games rock!


« Posted 2013-02-23 16:51:25 »

Hello,

I have a method for cropping images. But it only works for non-transparent. If I submit a transparent image using my method, the returned images does not preserve the transparent color.

How can I preserve transparency automatically? Or should I manually set transparency for subimages? How can I do that?

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   private static Image[] cropImage(Image pImage, int pCropWidth,
         int pCropHeight) {
      int i = 0;
      int j = 0;
      Vector<Image> imgs = new Vector<Image>();
      boolean finished = false;

      while (!finished) {
         if ((i + pCropWidth) > pImage.getWidth(null)) {
            i = 0;
            j += pCropHeight;
         }

         if ((j + pCropHeight) <= pImage.getHeight(null)) {
            Image image1;
            CropImageFilter cropimagefilter = new CropImageFilter(i, j,
                  pCropWidth, pCropHeight);
            FilteredImageSource filteredimagesource = new FilteredImageSource(
                  pImage.getSource(), cropimagefilter);
            image1 = Toolkit.getDefaultToolkit().createImage(
                  filteredimagesource);
            imgs.add(image1);
            i += pCropWidth;
         } else {
            pImage.flush();
            finished = true;
         }
      }

      Image[] tmp = new Image[imgs.size()];

      for (int e = 0; e < tmp.length; e++) {
         tmp[e] = imgs.get(e);
      }

      return tmp;
   }
Offline davedes
« Reply #1 - Posted 2013-02-23 17:37:21 »

Assuming you are using BufferedImages... Why don't you use getSubImage? It would be easier, take advantage of potential hardware acceleration, and also work with transparency.

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