/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2007-2008, 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.referencing.operation.builder;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;
import junit.framework.Assert;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridCoverageFactory;
import org.geotools.factory.Hints;
import org.geotools.geometry.DirectPosition2D;
import org.geotools.geometry.GeneralDirectPosition;
import org.geotools.geometry.GeneralEnvelope;
import org.geotools.referencing.crs.DefaultEngineeringCRS;
import org.geotools.referencing.operation.builder.algorithm.TPSInterpolation;
import org.opengis.geometry.DirectPosition;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
public class InterpolationTest extends TestCase {
public InterpolationTest(String name) {
super(name);
}
protected void setUp() throws Exception {
super.setUp();
}
protected void tearDown() throws Exception {
super.tearDown();
}
public void testInterpoaltion(){
BufferedImage bimage = new BufferedImage(100, 100, BufferedImage.TYPE_USHORT_GRAY);
bimage.setRGB(4, 3, 4);
GridCoverageFactory p = new GridCoverageFactory() ;
float[][] g = new float[10][10];
g[0][0]=2;
CoordinateReferenceSystem crs = DefaultEngineeringCRS.CARTESIAN_2D;
// Define the Envelope for our work; this will be the bounds of the final interpolation
GeneralDirectPosition min = new GeneralDirectPosition( 0.0, 0.0 );
GeneralDirectPosition max = new GeneralDirectPosition( 100.0, 100.0 );
GeneralEnvelope env = new GeneralEnvelope(min, max);
env.setCoordinateReferenceSystem(crs);
Hints k;
GridCoverageFactory fac = new GridCoverageFactory();
GridCoverage2D cov = fac.create("sd", g, env);
// Generate some known points to root the interpolation
DirectPosition a = new DirectPosition2D(crs,10,10);
DirectPosition b = new DirectPosition2D(crs,80,80);
DirectPosition c = new DirectPosition2D(crs,10,90);
DirectPosition d = new DirectPosition2D(crs,80,10);
// Define at each point the values to be interpolated; we do this in a HashMap
Map<DirectPosition, Float> pointsAndValues = new HashMap();
pointsAndValues.put(a, new Float(6.5456));
pointsAndValues.put(b, new Float(1.541906));
pointsAndValues.put(c, new Float(-9.54456));
pointsAndValues.put(d, new Float(7.2345));
//now we can construct the Interpolation Object
TPSInterpolation interp = new TPSInterpolation(pointsAndValues, 100, 100, env);
// We can create and show a coverage image of the interpolation within the Envelope
GridCoverageFactory gcf = new GridCoverageFactory();
GridCoverage2D coverage = gcf.create("Intepolated Coverage", interp.get2DGrid(), env);//.show();
//Assert.assertEquals( Double.parseDouble((coverage.evaluate(a, (Set)(new HashSet())).iterator().next()).toString()), pointsAndValues.get(a).floatValue(), 0.01);
Assert.assertEquals( coverage.evaluate(a, new float[1])[0], pointsAndValues.get(a).floatValue(), 0.01);
// We can also get interpolated value at any DirectPosition
float myValue = interp.getValue(a);
Assert.assertEquals( interp.getValue(a), pointsAndValues.get(a).floatValue(), 0.0);
Assert.assertEquals( interp.getValue(b), pointsAndValues.get(b).floatValue(), 0.0);
Assert.assertEquals( interp.getValue(c), pointsAndValues.get(c).floatValue(), 0.0);
Assert.assertEquals( interp.getValue(d), pointsAndValues.get(d).floatValue(), 0.0);
}
public static Test suite() {
return new TestSuite(InterpolationTest.class);
}
public static void main(final String[] args) {
junit.textui.TestRunner.run(suite());
}
}