/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2012, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.coverage.processing;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import javax.media.jai.Histogram;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.ViewType;
import org.junit.Before;
import org.junit.Test;
import org.opengis.parameter.ParameterValueGroup;
public class HistogramTest extends GridProcessingTestBase {
/**
* The grid coverage to test.
*/
private GridCoverage2D coverage;
/**
* Set up common objects used for all tests.
*/
@Before
public void setUp() {
coverage = EXAMPLES.get(0);
}
@Test
public void testHistogram() throws Exception {
GridCoverage2D source = coverage.view(ViewType.NATIVE);
CoverageProcessor processor = CoverageProcessor.getInstance();
ParameterValueGroup param = processor.getOperation("Histogram").getParameters();
param.parameter("Source").setValue(source);
GridCoverage2D processed = (GridCoverage2D) processor.doOperation(param);
Histogram histo = (Histogram) processed.getProperty("histogram");
assertNotNull(histo);
assertEquals(256, histo.getNumBins()[0]);
}
@Test
public void testHistogramWithNumBins() throws Exception {
GridCoverage2D source = coverage.view(ViewType.NATIVE);
CoverageProcessor processor = CoverageProcessor.getInstance();
ParameterValueGroup param = processor.getOperation("Histogram").getParameters();
param.parameter("Source").setValue(source);
param.parameter("numBins").setValue(new int[]{10});
GridCoverage2D processed = (GridCoverage2D) processor.doOperation(param);
Histogram histo = (Histogram) processed.getProperty("histogram");
assertNotNull(histo);
assertEquals(10, histo.getNumBins()[0]);
}
@Test
public void testHistogramWithHighLow() throws Exception {
GridCoverage2D source = coverage.view(ViewType.NATIVE);
CoverageProcessor processor = CoverageProcessor.getInstance();
ParameterValueGroup param = processor.getOperation("Histogram").getParameters();
param.parameter("Source").setValue(source);
param.parameter("numBins").setValue(new int[]{10});
param.parameter("lowValue").setValue(new double[]{100});
param.parameter("highValue").setValue(new double[]{200});
GridCoverage2D processed = (GridCoverage2D) processor.doOperation(param);
Histogram histo = (Histogram) processed.getProperty("histogram");
assertNotNull(histo);
assertEquals(10, histo.getNumBins()[0]);
assertEquals(100d, histo.getBinLowValue(0, 0), 0d);
assertEquals(200d, histo.getBinLowValue(0, 10), 0d);
}
}