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//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//=============================================================================
package org.uncommons.watchmaker.examples.monalisa;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Point;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.testng.annotations.Test;
import org.uncommons.maths.random.Probability;
import org.uncommons.watchmaker.examples.ExamplesTestUtils;
import org.uncommons.watchmaker.framework.EvolutionaryOperator;
/**
* Unit test for the {@link RemoveVertexMutation} evolutionary operator.
* @author Daniel Dyer
*/
public class RemoveVertexMutationTest
{
private final Dimension canvasSize = new Dimension(200, 200);
@Test
public void testRemoveVertex()
{
List<Point> points = Arrays.asList(new Point(1, 1), new Point(2, 2), new Point(3, 3), new Point(4, 4));
ColouredPolygon polygon = new ColouredPolygon(Color.RED, points);
List<ColouredPolygon> image = new ArrayList<ColouredPolygon>(1);
image.add(polygon);
EvolutionaryOperator<ColouredPolygon> mutation = new RemoveVertexMutation(canvasSize,
Probability.ONE);
List<ColouredPolygon> evolved = mutation.apply(image, ExamplesTestUtils.getRNG());
assert evolved.size() == 1 : "Polygon count should not be altered by mutation.";
List<Point> vertices = evolved.get(0).getVertices();
assert vertices.size() == polygon.getVertices().size() - 1
: "Polygon should have 1 fewer point after mutation.";
}
@Test
public void testZeroProbability()
{
List<Point> points = Arrays.asList(new Point(1, 1), new Point(2, 2), new Point(3, 3), new Point(4, 4));
ColouredPolygon polygon = new ColouredPolygon(Color.RED, points);
List<ColouredPolygon> image = new ArrayList<ColouredPolygon>(1);
image.add(polygon);
EvolutionaryOperator<ColouredPolygon> mutation = new RemoveVertexMutation(canvasSize,
Probability.ZERO);
List<ColouredPolygon> evolved = mutation.apply(image, ExamplesTestUtils.getRNG());
assert evolved.size() == 1 : "Polygon count should not be altered by mutation.";
ColouredPolygon evolvedPolygon = evolved.get(0);
List<Point> vertices = evolvedPolygon.getVertices();
assert vertices.size() == polygon.getVertices().size() : "Polygon should have no fewer points after mutation.";
assert evolvedPolygon == polygon : "Polygon should not have been changed at all.";
}
/**
* If the image already has the minimum permitted number of points, further points
* should not be removed by mutation.
*/
@Test
public void testAddMaxPoints()
{
List<Point> points = Arrays.asList(new Point(1, 1), new Point(2, 2), new Point(3, 3));
ColouredPolygon polygon = new ColouredPolygon(Color.RED, points);
List<ColouredPolygon> image = new ArrayList<ColouredPolygon>(1);
image.add(polygon);
EvolutionaryOperator<ColouredPolygon> mutation = new RemoveVertexMutation(canvasSize,
Probability.ONE);
List<ColouredPolygon> evolved = mutation.apply(image, ExamplesTestUtils.getRNG());
assert evolved.size() == 1 : "Polygon count should not be altered by mutation.";
ColouredPolygon evolvedPolygon = evolved.get(0);
List<Point> vertices = evolvedPolygon.getVertices();
assert vertices.size() == polygon.getVertices().size() : "Polygon should have no fewer points after mutation.";
assert evolvedPolygon == polygon : "Polygon should not have been changed at all.";
}
}
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