001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it 
010 * under the terms of the GNU Lesser General Public License as published by 
011 * the Free Software Foundation; either version 2.1 of the License, or 
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but 
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022 * USA.  
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025 * in the United States and other countries.]
026 *
027 * ---------------------------
028 * NormalizedMatrixSeries.java
029 * ---------------------------
030 * (C) Copyright 2003-2007, by Barak Naveh and Contributors.
031 *
032 * Original Author:  Barak Naveh;;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * Changes
036 * -------
037 * 10-Jul-2003 : Version 1 contributed by Barak Naveh (DG);
038 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
039 *
040 */
041 
042package org.jfree.data.xy;
043
044
045/**
046 * Represents a dense normalized matrix M[i,j] where each Mij item of the
047 * matrix has a value (default is 0). When a matrix item is observed using
048 * <code>getItem</code> method, it is normalized, that is, divided by the
049 * total sum of all items. It can be also be scaled by setting a scale factor.
050 */
051public class NormalizedMatrixSeries extends MatrixSeries {
052    
053    /** The default scale factor. */
054    public static final double DEFAULT_SCALE_FACTOR = 1.0;
055
056    /**
057     * A factor that multiplies each item in this series when observed using 
058     * getItem method.
059     */
060    private double m_scaleFactor = DEFAULT_SCALE_FACTOR;
061
062    /** The sum of all items in this matrix */
063    private double m_totalSum;
064
065    /**
066     * Constructor for NormalizedMatrixSeries.
067     *
068     * @param name  the series name.
069     * @param rows  the number of rows.
070     * @param columns  the number of columns.
071     */
072    public NormalizedMatrixSeries(String name, int rows, int columns) {
073        super(name, rows, columns);
074
075        /*
076         * we assum super is always initialized to all-zero matrix, so the
077         * total sum should be 0 upon initialization. However, we set it to
078         * Double.MIN_VALUE to get the same effect and yet avoid division by 0
079         * upon initialization.
080         */
081        this.m_totalSum = Double.MIN_VALUE;
082    }
083
084    /**
085     * Returns an item.
086     * 
087     * @param itemIndex  the index.
088     * 
089     * @return The value.
090     * 
091     * @see org.jfree.data.xy.MatrixSeries#getItem(int)
092     */
093    public Number getItem(int itemIndex) {
094        int i = getItemRow(itemIndex);
095        int j = getItemColumn(itemIndex);
096
097        double mij = get(i, j) * this.m_scaleFactor;
098        Number n = new Double(mij / this.m_totalSum);
099
100        return n;
101    }
102
103    /**
104     * Sets the factor that multiplies each item in this series when observed
105     * using getItem mehtod.
106     *
107     * @param factor new factor to set.
108     *
109     * @see #DEFAULT_SCALE_FACTOR
110     */
111    public void setScaleFactor(double factor) {
112        this.m_scaleFactor = factor;
113        // FIXME: this should generate a series change event
114    }
115
116
117    /**
118     * Returns the factor that multiplies each item in this series when
119     * observed using getItem mehtod.
120     *
121     * @return The factor
122     */
123    public double getScaleFactor() {
124        return this.m_scaleFactor;
125    }
126
127
128    /**
129     * Updates the value of the specified item in this matrix series.
130     *
131     * @param i the row of the item.
132     * @param j the column of the item.
133     * @param mij the new value for the item.
134     * 
135     * @see #get(int, int)
136     */
137    public void update(int i, int j, double mij) {
138        this.m_totalSum -= get(i, j);
139        this.m_totalSum += mij;
140
141        super.update(i, j, mij);
142    }
143
144    /**
145     * @see org.jfree.data.xy.MatrixSeries#zeroAll()
146     */
147    public void zeroAll() {
148        this.m_totalSum = 0;
149        super.zeroAll();
150    }
151}