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Java example source code file (RandomPolygonMutation.java)

This example Java source code file (RandomPolygonMutation.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

illegalargumentexception, list, mutationpolicy, polygonchromosome, randompolygonmutation, util

The RandomPolygonMutation.java Java example source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.math3.userguide.genetics;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.math3.genetics.Chromosome;
import org.apache.commons.math3.genetics.MutationPolicy;

public class RandomPolygonMutation implements MutationPolicy {
    private float mutationRate;
    private float mutationAmount;
    public RandomPolygonMutation(float mutationRate, float mutationAmount) {
        this.mutationRate = mutationRate;
        this.mutationAmount = mutationAmount;

    public Chromosome mutate(Chromosome chromosome) {
        if (!(chromosome instanceof PolygonChromosome)) {
            throw new IllegalArgumentException();

        PolygonChromosome polygons = (PolygonChromosome) chromosome;
        List<Polygon> repr = polygons.getPolygonRepresentation();

        List<Polygon> newRepr = new ArrayList(repr.size());
        for (Polygon p : repr) {
            newRepr.add(p.mutate(mutationRate, mutationAmount));
        return new PolygonChromosome(newRepr);

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