Examples of javax.media.jai.iterator.RectIter

javax.media.jai.iterator.RectIter
An iterator for traversing a read-only image in top-to-bottom, left-to-right order. This will generally be the fastest style of iterator, since it does not need to perform bounds checks against the top or left edges of tiles.
The iterator is initialized with a particular rectangle as its bounds, which it is illegal to exceed. This initialization takes place in a factory method and is not a part of the iterator interface itself. Once initialized, the iterator may be reset to its initial state by means of the startLine(), startPixels(), and startBands() methods. Its position may be advanced using the nextLine(), jumpLines(), nextPixel(), jumpPixels(), and nextBand() methods.
The iterator's position may be tested against the bounding rectangle by means of the finishedLines(), finishedPixels(), and finishedBands() methods, as well as the hybrid methods nextLineDone(), nextPixelDone(), and nextBandDone().
The getSample(), getSampleFloat(), and getSampleDouble() methods are provided to allow read-only access to the source data. The various source bands may also be accessed in random fashion using the variants that accept a band index. The getPixel() methods allow retrieval of all bands simultaneously.
An instance of RectIter may be obtained by means of the RectIterFactory.create() method, which returns an opaque object implementing this interface. @see WritableRectIter @see RectIterFactory

       * may be important. But it seems to still lower than query tiles
       * many time (which may involve more computation than necessary).
       */
      bounds.x = ix - left;
      bounds.y = iy - top;
      final RectIter iter = RectIterFactory.create(image.getExtendedData(bounds, this.borderExtender), bounds);
      for (; band<bandUp; band++) {
          iter.startLines();
          int j=0; do {
              iter.startPixels();
              final int[] row=samples[j++];
              int i=0; do {
                  row[i++] = iter.getSample(band);
              }
              while (!iter.nextPixelDone());
              assert i==row.length;
          }
          while (!iter.nextLineDone());
          assert j == samples.length;
          final int xfrac = (int) ((x-x0) * (1 << interpolation.getSubsampleBitsH()));
          final int yfrac = (int) ((y-y0) * (1 << interpolation.getSubsampleBitsV()));
          dest[band] = interpolation.interpolate(samples, xfrac, yfrac);
      }

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            final RenderedImage raster = gc2d.getRenderedImage();
            final int numBands = raster.getSampleModel().getNumBands();
            final int dataType = raster.getSampleModel().getDataType();
            final double[] valuesD = new double[numBands];
            final int[] valuesI = new int[numBands];
            RectIter iterator = RectIterFactory.create(raster, PlanarImage
                    .wrapRenderedImage(raster).getBounds());


            iterator.startLines();
            while (!iterator.finishedLines()) {
                iterator.startPixels();
                while (!iterator.finishedPixels()) {
                    switch (dataType) {
                    case DataBuffer.TYPE_BYTE:
                    case DataBuffer.TYPE_INT:
                    case DataBuffer.TYPE_SHORT:
                    case DataBuffer.TYPE_USHORT:
                        iterator.getPixel(valuesI);
                        for (int i = 0; i < numBands; i++) {
                            // spit out
                            chars(String.valueOf(valuesI[i]));
                            if (i + 1 < numBands) {
                                chars(",");
                            }
                        }
                        break;
                    case DataBuffer.TYPE_DOUBLE:
                    case DataBuffer.TYPE_FLOAT:
                        iterator.getPixel(valuesD);
                        for (int i = 0; i < numBands; i++) {
                            // spit out
                            chars(String.valueOf(valuesD[i]));
                            if (i + 1 < numBands) {
                                chars(",");
                            }
                        }
                        break;
                    default:
                        break;
                    }
                    // space as sample separator
                    chars(" ");
                    iterator.nextPixel();
                }
                iterator.nextLine();
                chars("\n");
            }


            end("tupleList");
            end("gml:DataBlock");

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