gaphenotypeexpresser.java

JGAP是一种遗传算法和遗传规划的组成部分提供了一个Java框架。它提供了基本的遗传机制

/*
 * This file is part of JGAP.
 *
 * JGAP offers a dual license model containing the LGPL as well as the MPL.
 *
 * For licensing information please see the file license.txt included with JGAP
 * or have a look at the top of class org.jgap.Chromosome which representatively
 * includes the JGAP license policy applicable for any file delivered with JGAP.
 */
package examples.monalisa.core;

import java.awt.*;
import java.awt.image.*;
import org.jgap.*;
import org.jgap.impl.*;

/**
 *
 * @author Yann N. Dauphin
 * @since 3.4
 */
public class GAPhenotypeExpresser {
  /** String containing the CVS revision. Read out via reflection!*/
  private final static String CVS_REVISION = "$Revision: 1.2 $";

  private GAConfiguration m_conf;

  private BufferedImage m_generated;

  private Graphics m_graphics;

  public GAPhenotypeExpresser(GAConfiguration a_conf) {
    m_conf = a_conf;
    BufferedImage target = m_conf.getTarget();
    m_generated = new BufferedImage(target.getWidth(), target.getHeight(),
                                    BufferedImage.TYPE_INT_ARGB);
    m_graphics = m_generated.getGraphics();
  }

  public BufferedImage express(IChromosome a_chromosome) {
    m_graphics.setColor(Color.white);
    m_graphics.fillRect(0, 0, m_generated.getWidth(), m_generated.getHeight());
    for (int i = 0; i < m_conf.getMaxPolygons(); i++) {
      m_graphics.setColor(expressColor(a_chromosome, i));
      m_graphics.fillPolygon(expressPolygon(a_chromosome, i));
    }
    return m_generated;
  }

  /**
   * @param a_chromosome the chromosome that holds the color information
   * @param a_n the index of the polygon
   *
   * @return an object representing the nth color encoded in the chromosome
   */
  public Color expressColor(IChromosome a_chromosome, int a_n) {
    int pos = a_n * GAInitialChromosomeFactory.getNumberOfGenesPerPolygon();
    IntegerGene h = (IntegerGene) a_chromosome.getGene(pos);
    IntegerGene s = (IntegerGene) a_chromosome.getGene(pos + 1);
    IntegerGene b = (IntegerGene) a_chromosome.getGene(pos + 2);
    IntegerGene a = (IntegerGene) a_chromosome.getGene(pos + 3);
    Color c = Color.getHSBColor(h.intValue() / 255.0f,
                                s.intValue() / 255.0f, b.intValue() / 255.0f);
    return new Color(c.getRed(), c.getGreen(), c.getBlue(), a.intValue());
  }

  /**
   * @param a_chromosome the chromosome that holds the polygon information
   * @param a_n the index of the polygon
   *
   * @return an object representing the nth polygon encoded in the chromosome
   */
  public Polygon expressPolygon(IChromosome a_chromosome, int a_n) {
    int[] xpoints = new int[GAInitialChromosomeFactory.POINTS];
    int[] ypoints = new int[GAInitialChromosomeFactory.POINTS];
    int pos = a_n * GAInitialChromosomeFactory.getNumberOfGenesPerPolygon()
        + GAInitialChromosomeFactory.getNumberOfColorGenesPerPolygon();
    for (int j = 0; j < GAInitialChromosomeFactory.POINTS; j++) {
      xpoints[j] = ( (IntegerGene) a_chromosome.getGene(pos++)).intValue();
      ypoints[j] = ( (IntegerGene) a_chromosome.getGene(pos++)).intValue();
    }
    return new Polygon(xpoints, ypoints, GAInitialChromosomeFactory.POINTS);
  }
}