Example usage for java.awt.image Raster getPixel

Introduction

In this page you can find the example usage for java.awt.image Raster getPixel.

Prototype

public double[] getPixel(int x, int y, double[] dArray) 

Source Link

Document

Returns the samples in an array of double for the specified pixel.

Usage

From source file:org.geotools.gce.imagemosaic.ImageMosaicReaderTest.java

@Test
//    @Ignore/*from  www  .jav a2 s  . c  o m*/
public void testRequestInOut() throws Exception {
    final AbstractGridFormat format = TestUtils.getFormat(rgbAURL);
    final ImageMosaicReader reader = TestUtils.getReader(rgbAURL, format);

    assertNotNull(reader);

    // ask to extract an area that is inside the coverage bbox, so that the area is partly
    // inside the raster, and partly outside
    final ParameterValue<GridGeometry2D> ggp = AbstractGridFormat.READ_GRIDGEOMETRY2D.createValue();
    Envelope2D env = new Envelope2D(reader.getCrs(), 64887, 2499342, 646897 - 64887, 3155705 - 2499342);
    GridGeometry2D gg = new GridGeometry2D(new GridEnvelope2D(0, 0, 100, 100), (Envelope) env);
    ggp.setValue(gg);

    // red background
    final ParameterValue<double[]> bgp = ImageMosaicFormat.BACKGROUND_VALUES.createValue();
    bgp.setValue(new double[] { 255, 0, 0, 255 });

    // read and check we actually got a coverage in the requested area
    GridCoverage2D coverage = reader.read(new GeneralParameterValue[] { ggp, bgp });
    assertNotNull(coverage);
    System.out.println(coverage.getEnvelope2D());
    System.out.println(env);
    assertTrue(coverage.getEnvelope2D().contains((Rectangle2D) env));

    // and that the color is the expected one given the background values provided
    RenderedImage ri = coverage.getRenderedImage();
    // ImageIO.write(ri, "PNG", new File("/tmp/mix.png"));
    System.out.println(ri.getNumXTiles());
    System.out.println(ri.getNumYTiles());
    int[] pixel = new int[4];
    Raster tile = ri.getTile(ri.getMinTileX() + ri.getNumXTiles() - 1,
            ri.getMinTileY() + ri.getNumYTiles() - 1);
    tile.getPixel(tile.getWidth() / 2, tile.getHeight() / 2, pixel);
    assertEquals(255, pixel[0]);
    assertEquals(0, pixel[1]);
    assertEquals(0, pixel[2]);
    assertEquals(255, pixel[3]);
}

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From source file:org.geotools.process.raster.FootprintExtractionProcessTest.java

@Test
public void cloudExtractionWithoutDarkPixels() throws Exception {
    GeoTiffReader reader = null;/*from  w w w . ja v a  2  s.  c  om*/
    FeatureIterator<SimpleFeature> iter = null;
    GridCoverage2D cov = null;
    try {
        reader = new GeoTiffReader(cloudFile);
        cov = reader.read(null);

        // Exclude pixels with luminance less than 20.
        final int referenceLuminance = 10;
        List<Range<Integer>> exclusionRanges = Collections
                .singletonList(new Range<Integer>(Integer.class, 0, referenceLuminance));
        SimpleFeatureCollection fc = process.execute(cov, exclusionRanges, 10d, false, null, true, true, null,
                null);
        iter = fc.features();

        SimpleFeature feature = iter.next();
        Geometry geometry = (Geometry) feature.getDefaultGeometry();

        Raster raster = cov.getRenderedImage().getData();
        int[] darkPixel = new int[3];

        // These positions identify a couple of dark pixels of the cloud edge
        raster.getPixel(9, 13, darkPixel);
        double luminance = ImageUtilities.RGB_TO_GRAY_MATRIX[0][0] * darkPixel[0]
                + ImageUtilities.RGB_TO_GRAY_MATRIX[0][1] * darkPixel[1]
                + ImageUtilities.RGB_TO_GRAY_MATRIX[0][2] * darkPixel[2];
        assertTrue(luminance < referenceLuminance);

        raster.getPixel(15, 7, darkPixel);
        luminance = ImageUtilities.RGB_TO_GRAY_MATRIX[0][0] * darkPixel[0]
                + ImageUtilities.RGB_TO_GRAY_MATRIX[0][1] * darkPixel[1]
                + ImageUtilities.RGB_TO_GRAY_MATRIX[0][2] * darkPixel[2];
        assertTrue(luminance < referenceLuminance);

        // The computed polygon should have different shape due to dark pixels being excluded
        assertFalse(referenceGeometry.equalsExact(geometry, TOLERANCE));
    } finally {
        if (iter != null) {
            iter.close();
        }
        if (reader != null) {
            try {
                reader.dispose();
            } catch (Throwable t) {

            }
        }
        if (cov != null) {
            try {
                cov.dispose(true);
            } catch (Throwable t) {

            }
        }
    }
}

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From source file:org.squidy.designer.util.ImageUtils.java

public static Shape getShapeOfImage(BufferedImage image) {
    // Get the data
    Raster data = image.getData();
    //// w  w  w  .ja va  2 s  .c om
    //      System.out.println("num of bands = " + data.getNumBands());
    // The colour of the pixel looking at
    // Shoulld have length of 4 (RGBA)
    int[] lookAt = null;
    // The map of all the points
    Point2D[][] pointMap = new Point2D[data.getWidth()][data.getHeight()];
    // The from point
    Point2D from = null;
    // The general path
    GeneralPath path = new GeneralPath();

    // Go round height
    for (int y = 0; y < data.getHeight(); y++) {
        // Go round width
        for (int x = 0; x < data.getWidth(); x++) {
            // Get the colour
            lookAt = data.getPixel(x, y, lookAt);
            // The alpha
            int a = lookAt[3];
            // If > then 0
            if (a > 0) {
                // Output 1
                //System.out.print(1);
                // Save point
                pointMap[x][y] = new Point2D.Double(x, y);

                if (from == null) {
                    from = pointMap[x][y];
                }
            } // 0
            else {
                // Output 0
                //System.out.print(0);
                // Nothing her
                pointMap[x][y] = null;
            }
        }
        // New line
        //System.out.println();
    }

    // Move it to the from
    if (from != null) {
        path.moveTo(from.getX(), from.getY());
        /*
         * Make the shape
         */
        // Go round height
        for (int y = 0; y < data.getHeight(); y++) {
            // Go round width
            for (int x = 0; x < data.getWidth(); x++) {
                // If the point is not null
                if (pointMap[x][y] != null) {
                    // Draw a line to
                    path.append(new Rectangle2D.Double(pointMap[x][y].getX(), pointMap[x][y].getY(), 1, 1),
                            true);
                    //               path.lineTo(pointMap[x][y].getX(), pointMap[x][y].getY());
                }
            }

        }
        path.closePath();
        // TODO: Put in the middle
        return path;
    }
    return null;
}

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