/** Another test for chessknight weigths, to fix a bug that incorrectly checked image bounds. */
@Test
public final void testDistanceMap_UntilCorners_ChessKnight2() {
ByteProcessor image = new ByteProcessor(9, 9);
image.setValue(255);
image.fill();
image.set(6, 6, 0);
short[] weights = ChamferWeights.CHESSKNIGHT.getShortWeights();
DistanceTransform5x5Short algo = new DistanceTransform5x5Short(weights, false);
ImageProcessor result = algo.distanceMap(image);
assertNotNull(result);
assertEquals(image.getWidth(), result.getWidth());
assertEquals(image.getHeight(), result.getHeight());
assertEquals(42, result.get(0, 0));
assertEquals(32, result.get(8, 0));
assertEquals(32, result.get(0, 8));
assertEquals(14, result.get(8, 8));
assertEquals(30, result.get(0, 6));
}
@Test
public final void testDistanceMap_UntilCorners_Weights23() {
ByteProcessor image = new ByteProcessor(7, 7);
image.setValue(255);
image.fill();
image.set(4, 4, 0);
short[] weights = ChamferWeights.WEIGHTS_23.getShortWeights();
DistanceTransform5x5Short algo = new DistanceTransform5x5Short(weights, false);
ImageProcessor result = algo.distanceMap(image);
assertNotNull(result);
assertEquals(image.getWidth(), result.getWidth());
assertEquals(image.getHeight(), result.getHeight());
assertEquals(12, result.get(0, 0));
assertEquals(10, result.get(6, 0));
assertEquals(10, result.get(0, 6));
assertEquals(6, result.get(6, 6));
assertEquals(9, result.get(0, 5));
}
@Test
public final void testDistanceMap_ChessBoard() {
ByteProcessor image = new ByteProcessor(12, 10);
image.setBackgroundValue(0);
image.setValue(0);
image.fill();
for (int y = 2; y < 8; y++) {
for (int x = 2; x < 10; x++) {
image.set(x, y, 255);
}
}
short[] weights = ChamferWeights.CHESSBOARD.getShortWeights();
DistanceTransform5x5Short algo = new DistanceTransform5x5Short(weights, true);
ImageProcessor result = algo.distanceMap(image);
assertNotNull(result);
assertEquals(image.getWidth(), result.getWidth());
assertEquals(image.getHeight(), result.getHeight());
assertEquals(3, result.get(4, 4));
}