eva2/src/eva2/optimization/tools/ParetoFrontLocalTester.java

package eva2.optimization.tools;


import eva2.gui.plot.GraphPointSet;
import eva2.gui.plot.Plot;

import java.io.*;
import java.util.ArrayList;

/**
 *
 */
public class ParetoFrontLocalTester {

    // ToDo: Have this on another frame (won't show as JInternalFrame)
    private Plot plot;
    private int index = 0;
    private BufferedWriter outputFile = null;

    private void show() {
        double[] loss = new double[5];
        loss[0] = 0.0;
        loss[1] = 1.0;
        loss[2] = 0.2;
        loss[3] = 0.5;
        loss[4] = 0.7;

        double[][] risk = new double[5][5];
        risk[0][0] = 1.0;
        risk[1][1] = 0.0;
        risk[2][2] = 0.7;
        risk[3][3] = 0.5;
        risk[4][4] = 0.2;

        risk[0][1] = 0.00;
        risk[0][2] = 0.10;
        risk[0][3] = 0.00;
        risk[0][4] = 0.30;

        risk[1][2] = 0.00;
        risk[1][3] = 0.00;
        risk[1][4] = 0.00;

        risk[2][3] = 0.30;
        risk[2][4] = -0.10;

        risk[3][4] = 0.00;

        for (int i = 0; i < risk.length; i++) {
            for (int j = i + 1; j < risk.length; j++) {
                risk[j][i] = risk[i][j];
            }
        }

        this.initShow();

        // now calc the stuff
        ArrayList complete = new ArrayList();
        ArrayList elements = new ArrayList();
        double[] tmpD;
        double[][] tmpElem;
        int res = 100;
        for (int i = 0; i < loss.length; i++) {
            tmpElem = new double[res + 1][2];
            for (int j = i + 1; j < loss.length; j++) {
                double w = 0;
                for (int k = 0; k < res + 1; k++) {
                    tmpElem[k][0] = w * loss[i] + (1 - w) * loss[j];
                    tmpElem[k][1] = (w * w) * risk[i][i] + ((1 - w) * (1 - w)) * risk[j][j] + 2 * (w * (1 - w) * risk[i][j]);
                    tmpD = new double[2];
                    tmpD[0] = tmpElem[k][0];
                    tmpD[1] = tmpElem[k][1];
                    w += 1 / (double) res;
                    complete.add(tmpD);
                }
                // now plot this line
                this.showLine(tmpElem);
                elements.add(tmpElem);
            }
        }
        this.saveThisStuff(complete, elements);
    }

    private void saveThisStuff(ArrayList c, ArrayList e) {
        try {
            this.outputFile = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("CompleteList")));
        } catch (FileNotFoundException ex) {
            System.out.println("Could not open output file!");
        }
        String line;
        double[] tmpD;
        line = "Risk \t Loss";
        this.writeToFile(line);
        for (int i = 0; i < c.size(); i++) {
            tmpD = (double[]) c.get(i);
            line = tmpD[1] + "\t" + tmpD[0];
            this.writeToFile(line);
        }
        try {
            this.outputFile.close();
        } catch (java.io.IOException ex) {
        }
        // next file
        try {
            this.outputFile = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("ListElements")));
        } catch (FileNotFoundException ex) {
            System.out.println("Could not open output file!");
        }
        int length = e.size();
        double[][][] cara = new double[length][][];
        for (int i = 0; i < e.size(); i++) {
            cara[i] = (double[][]) e.get(i);
        }
        line = "";
        for (int i = 0; i < cara.length; i++) {
            line = "Risk" + i + "\t" + "Loss" + i;
        }
        this.writeToFile(line);
        for (int i = 0; i < cara[0].length; i++) {
            line = "";
            for (int j = 0; j < cara.length; j++) {
                line += cara[j][i][1] + "\t" + cara[j][i][0] + "\t";
            }
            this.writeToFile(line);
        }
        try {
            this.outputFile.close();
        } catch (java.io.IOException ex) {
        }
    }

    /**
     * This method writes Data to file.
     *
     * @param line The line that is to be added to the file
     */
    private void writeToFile(String line) {
        String write = line + "\n";
        if (this.outputFile == null) {
            return;
        }
        try {
            this.outputFile.write(write, 0, write.length());
            this.outputFile.flush();
        } catch (IOException e) {
            System.out.println("Problems writing to output file!");
        }
    }

    private void initShow() {
        double[] tmpD = new double[2];
        tmpD[0] = 0;
        tmpD[1] = 0;
        this.plot = new Plot("Multiobjective Optimization", "Y1", "Y2", tmpD, tmpD);

    }

    private void showLine(double[][] elm) {
        GraphPointSet mySet = new GraphPointSet(this.index, this.plot.getFunctionArea());
        this.index++;
        for (int i = 0; i < elm.length; i++) {
            mySet.addDPoint(elm[i][1], elm[i][0]);
        }
    }

    public static void main(String[] args) {
        ParetoFrontLocalTester t = new ParetoFrontLocalTester();
        t.show();
    }
}