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

    // // TODO: got 700 (rather than 650) on mac osx
    // checkMatrixEqual(scaledJAIImage, mapDataAfter, 0.0);
    // }


    protected void checkMatrixEqual( RenderedImage image, double[][] matrix, double delta ) {
        RectIter rectIter = RectIterFactory.create(image, null);
        int y = 0;
        do {
            int x = 0;
            do {
                double value = rectIter.getSampleDouble();
                double expectedResult = matrix[y][x];
                if (Double.isNaN(value)) {
                    assertTrue(x + " " + y, Double.isNaN(expectedResult));
                } else {
                    assertEquals(x + " " + y, expectedResult, value, delta);
                }
                x++;
            } while( !rectIter.nextPixelDone() );
            rectIter.startPixels();
            y++;
        } while( !rectIter.nextLineDone() );
    }

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        assertEquals(10, width);
        return gc;
    }


    protected void checkMatrixEqual( RenderedImage image, double[][] matrix, double delta ) {
        RectIter rectIter = RectIterFactory.create(image, null);
        int y = 0;
        do {
            int x = 0;
            do {
                double value = rectIter.getSampleDouble();
                double expectedResult = matrix[y][x];
                if (Double.isNaN(value)) {
                    assertTrue(x + " " + y, Double.isNaN(expectedResult));
                } else {
                    assertEquals(x + " " + y, expectedResult, value, delta);
                }
                x++;
            } while( !rectIter.nextPixelDone() );
            rectIter.startPixels();
            y++;
        } while( !rectIter.nextLineDone() );
    }

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        GridCoverage2D readCoverage = read(grassFile, r, crs32632);
        checkMatrixEqual(readCoverage.getRenderedImage(), mapData, 0);
    }


    protected void printImage( RenderedImage image ) {
        RectIter rectIter = RectIterFactory.create(image, null);
        int y = 0;
        do {
            int x = 0;
            do {
                double value = rectIter.getSampleDouble();
                System.out.print(value + " ");
                x++;
            } while( !rectIter.nextPixelDone() );
            rectIter.startPixels();
            y++;
            System.out.println();
        } while( !rectIter.nextLineDone() );
    }

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        // readgrassraster stop
        return gc;
    }


    protected void checkMatrixEqual( RenderedImage image, double[][] matrix, double delta ) {
        RectIter rectIter = RectIterFactory.create(image, null);
        int y = 0;
        do {
            int x = 0;
            do {
                double value = rectIter.getSampleDouble();
                double expectedResult = matrix[y][x];
                if (Double.isNaN(value)) {
                    assertTrue(x + " " + y, Double.isNaN(expectedResult));
                } else {
                    assertEquals(x + " " + y, expectedResult, value, delta);
                }
                x++;
            } while( !rectIter.nextPixelDone() );
            rectIter.startPixels();
            y++;
        } while( !rectIter.nextLineDone() );
    }

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        RenderedImage renderedImage = coverage2D.getRenderedImage();
        printImage(renderedImage);
    }


    public static void printImage( RenderedImage renderedImage ) {
        RectIter rectIter = RectIterFactory.create(renderedImage, null);
        int y = 0;
        do {
            int x = 0;
            do {
                double value = rectIter.getSampleDouble();
                System.out.print(value + " ");
                x++;
            } while( !rectIter.nextPixelDone() );
            rectIter.startPixels();
            y++;
            System.out.println();
        } while( !rectIter.nextLineDone() );
    }

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     * Dump the float values in a (small) grid coverage to the console
     */
    private void textPrintFloat(GridCoverage2D cov) {
        RenderedImage img = cov.getRenderedImage();
        int nb = img.getSampleModel().getNumBands();
        RectIter iter = RectIterFactory.create(img, null);
        float[] pixel = new float[nb];
        do {
            do {
                iter.getPixel(pixel);
                for (int i = 0; i < nb; i++) {
                    System.out.print(pixel[i]);
                }
            } while (!iter.nextPixelDone());
            iter.startPixels();
            System.out.println();
        } while (!iter.nextLineDone());
    }

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     * Dump the int values in a (small) grid coverage to the console
     */
    private void textPrint(GridCoverage2D cov) {
        RenderedImage img = cov.getRenderedImage();
        int nb = img.getSampleModel().getNumBands();
        RectIter iter = RectIterFactory.create(img, null);
        int[] pixel = new int[nb];
        int w = img.getWidth();
        do {
            do {
                iter.getPixel(pixel);
                for (int i = 0; i < nb; i++) {
                    System.out.print(pixel[i]);
                }
            } while (!iter.nextPixelDone());
            iter.startPixels();
            System.out.println();
        } while (!iter.nextLineDone());
    }

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     *
     * @param expected The image containing the expected pixel values.
     * @param actual   The image containing the actual pixel values.
     */
    protected static void assertRasterEquals(final RenderedImage expected, final RenderedImage actual) {
        final RectIter e = RectIterFactory.create(expected, null);
        final RectIter a = RectIterFactory.create(actual,   null);
        if (!e.finishedLines()) do {
            assertFalse(a.finishedLines());
            if (!e.finishedPixels()) do {
                assertFalse(a.finishedPixels());
                if (!e.finishedBands()) do {
                    assertFalse(a.finishedBands());
                    final float pe = e.getSampleFloat();
                    final float pa = a.getSampleFloat();
                    assertEquals(pe, pa, EPS);
                    a.nextBand();
                } while (!e.nextBandDone());
                assertTrue(a.finishedBands());
                a.nextPixel();
                a.startBands();
                e.startBands();
            } while (!e.nextPixelDone());
            assertTrue(a.finishedPixels());
            a.nextLine();
            a.startPixels();
            e.startPixels();
        } while (!e.nextLineDone());
        assertTrue(a.finishedLines());
    }

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       * 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 double[] row=samples[j++];
              int i=0; do {
                  row[i++] = iter.getSampleDouble(band);
              }
              while (!iter.nextPixelDone());
              assert i == row.length;
          }
          while (!iter.nextLineDone());
          assert j == samples.length;
          float dx = (float)(x-x0); if (dx==1) dx=ONE_EPSILON;
          float dy = (float)(y-y0); if (dy==1) dy=ONE_EPSILON;
          final double value = interpolation.interpolate(samples, dx, dy);
          if (Double.isNaN(value)) {

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       * 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 float[] row=samples[j++];
              int i=0; do {
                  row[i++] = iter.getSampleFloat(band);
              }
              while (!iter.nextPixelDone());
              assert i == row.length;
          }
          while (!iter.nextLineDone());
          assert j == samples.length;
          float dx = (float)(x-x0); if (dx==1) dx=ONE_EPSILON;
          float dy = (float)(y-y0); if (dy==1) dy=ONE_EPSILON;
          final float value = interpolation.interpolate(samples, dx, dy);
          if (Float.isNaN(value)) {

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