hmmdrawer.java

java实现的隐马尔科夫模型

/* jahmm package - v0.3.1 */

/*
 *  Copyright (c) 2004, Jean-Marc Francois.
 *
 *  This file is part of Jahmm.
 *  Jahmm is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Jahmm 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Jahmm; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package be.ac.ulg.montefiore.run.jahmm.draw;

import java.io.*;
import java.text.*;
import be.ac.ulg.montefiore.run.jahmm.*;


/**
 * An HMM to <i>dot</i> file converter.  See
 * <url>http://www.research.att.com/sw/tools/graphviz/</url>
 * for more information on the .<i>dot</i> tool.
 */
public class HmmDrawer {
    
    double minimumAij = 0.01;
    double minimumPi = 0.01;
    NumberFormat probabilityFormat;


    /**
     * This class converts an HMM to a dot file.
     */
    public HmmDrawer() {
	probabilityFormat = NumberFormat.getInstance();
	probabilityFormat.setMaximumFractionDigits(2);
    }
    
    String convert(Hmm hmm) {
	String s = beginning();
	
	s += transitions(hmm);
	s += states(hmm);
	
	return s + ending();
    }

    String beginning() {
	return "digraph G {\n";
    }
    
    String transitions(Hmm hmm) {
	String s = "";
	
	for (int i = 0; i < hmm.nbStates(); i++)
	    for (int j = 0; j < hmm.nbStates(); j++)
		if (hmm.getAij(i, j) >= minimumAij)
		    s += "\t" + i + " -> " + j + " [label=" + 
			probabilityFormat.format(hmm.getAij(i, j)) + "];\n";
	
	return s;
    }

    String states(Hmm hmm) {
	String s = "";

	for (int i = 0; i < hmm.nbStates(); i++) {
	    s += "\t" + i + " [";
	    
	    if (hmm.getPi(i) >= minimumPi) {
		s += "shape=doublecircle, label=\"" + i +
		    " - Pi= " + probabilityFormat.format(hmm.getPi(i)) + " - " +
		    opdfLabel(hmm, i) + "\"";
	    } else {
		s += "shape=circle, label=\"" + i + " - " +
		    opdfLabel(hmm, i) + "\"";
	    }
	    
	    s += "];\n";
	}
	
	return s;
    }

    String opdfLabel(Hmm hmm, int stateNb) {
	return "";
    }
    
    String ending() {
	return "}\n";
    }
    
    /**
     * Writes a dot file depicting the given HMM.
     *
     * @param hmm The HMM to depict.
     * @param filename The resulting 'dot' file filename.
     */
    public void write(Hmm hmm, String filename) throws IOException {
	FileWriter fw = new FileWriter(filename);
	fw.write(convert(hmm));
	fw.close();
    }
}