@Test
public void testTranslatedImage() throws Exception {
BufferedImage bi = new BufferedImage(256, 256, BufferedImage.TYPE_BYTE_GRAY);
TiledImage image =
new TiledImage(
0,
0,
256,
256,
1,
1,
bi.getSampleModel().createCompatibleSampleModel(256, 256),
bi.getColorModel());
Graphics g = image.createGraphics();
g.setColor(Color.WHITE);
g.fillRect(0, 0, 20, 20);
g.setColor(new Color(20, 20, 20)); // A dark gray
g.fillRect(20, 20, 20, 20);
g.setColor(new Color(200, 200, 200)); // A light gray
g.fillRect(0, 20, 20, 20);
g.dispose();
RenderedImage indexed = quantize(image);
assertTrue(indexed.getColorModel() instanceof IndexColorModel);
IndexColorModel icm = (IndexColorModel) indexed.getColorModel();
assertEquals(4, icm.getMapSize()); // Black background, white fill,
// light gray fill, dark gray fill =
// 4 colors
}
/** Tests that flipping axis on a coverage whose origin is not (0,0) works as expected */
@Test
public void testFlipTranslated() throws Exception {
// build a translated image
SampleModel sm =
RasterFactory.createPixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, 256, 256, 3);
ColorModel cm = PlanarImage.createColorModel(sm);
TiledImage ti = new TiledImage(-10, -10, 5, 5, 0, 0, sm, cm);
Graphics2D g = ti.createGraphics();
g.setColor(Color.GREEN);
g.fillRect(-10, -10, 5, 5);
g.dispose();
// build a coverage around it
CoordinateReferenceSystem wgs84LatLon = CRS.decode("EPSG:4326");
final GridCoverageFactory factory = CoverageFactoryFinder.getGridCoverageFactory(null);
GridCoverage2D coverage =
factory.create("translated", ti, new Envelope2D(wgs84LatLon, 3, 5, 6, 8));
// verify we're good
int[] pixel = new int[3];
coverage.evaluate((DirectPosition) new DirectPosition2D(4, 6), pixel);
assertEquals(0, pixel[0]);
assertEquals(255, pixel[1]);
assertEquals(0, pixel[2]);
// now reproject flipping the axis
CoordinateReferenceSystem wgs84LonLat = CRS.decode("EPSG:4326", true);
GridGeometry gg =
new GridGeometry2D(
new GridEnvelope2D(-10, -10, 5, 5), (Envelope) new Envelope2D(wgs84LonLat, 5, 3, 8, 6));
GridCoverage2D flipped =
(GridCoverage2D)
Operations.DEFAULT.resample(
coverage, wgs84LonLat, gg, Interpolation.getInstance(Interpolation.INTERP_NEAREST));
// before the fix the pixel would have been black
flipped.evaluate((DirectPosition) new DirectPosition2D(6, 4), pixel);
assertEquals(0, pixel[0]);
assertEquals(255, pixel[1]);
assertEquals(0, pixel[2]);
}
