    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     * ExtendedCategoryAxis.java
    029     * -------------------------
    030     * (C) Copyright 2003-2007, by Object Refinery Limited and Contributors.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   -;
    034     *
    035     * Changes
    036     * -------
    037     * 07-Nov-2003 : Version 1 (DG);
    038     * 07-Jan-2004 : Updated the createLabel() method (DG);
    039     * 29-Jan-2004 : Added paint attribute (DG);
    040     * ------------- JFREECHART 1.0.x ---------------------------------------------
    041     * 21-Mar-2007 : Implemented equals(), clone() and fixed serialization (DG);
    042     *
    043     */
    044
    045    package org.jfree.chart.axis;
    046
    047    import java.awt.Color;
    048    import java.awt.Font;
    049    import java.awt.Graphics2D;
    050    import java.awt.Paint;
    051    import java.io.IOException;
    052    import java.io.ObjectInputStream;
    053    import java.io.ObjectOutputStream;
    054    import java.util.HashMap;
    055    import java.util.Map;
    056
    057    import org.jfree.chart.event.AxisChangeEvent;
    058    import org.jfree.io.SerialUtilities;
    059    import org.jfree.text.TextBlock;
    060    import org.jfree.text.TextFragment;
    061    import org.jfree.text.TextLine;
    062    import org.jfree.ui.RectangleEdge;
    063    import org.jfree.util.PaintUtilities;
    064
    065    /**
    066     * An extended version of the {@link CategoryAxis} class that supports
    067     * sublabels on the axis.
    068     */
    069    public class ExtendedCategoryAxis extends CategoryAxis {
    070
    071        /** For serialization. */
    072        static final long serialVersionUID = -3004429093959826567L;
    073
    074        /** Storage for the sublabels. */
    075        private Map sublabels;
    076
    077        /** The sublabel font. */
    078        private Font sublabelFont;
    079
    080        /** The sublabel paint. */
    081        private transient Paint sublabelPaint;
    082
    083        /**
    084         * Creates a new axis.
    085         *
    086         * @param label  the axis label.
    087         */
    088        public ExtendedCategoryAxis(String label) {
    089            super(label);
    090            this.sublabels = new HashMap();
    091            this.sublabelFont = new Font("SansSerif", Font.PLAIN, 10);
    092            this.sublabelPaint = Color.black;
    093        }
    094
    095        /**
    096         * Returns the font for the sublabels.
    097         *
    098         * @return The font (never <code>null</code>).
    099         *
    100         * @see #setSubLabelFont(Font)
    101         */
    102        public Font getSubLabelFont() {
    103            return this.sublabelFont;
    104        }
    105
    106        /**
    107         * Sets the font for the sublabels and sends an {@link AxisChangeEvent} to
    108         * all registered listeners.
    109         *
    110         * @param font  the font (<code>null</code> not permitted).
    111         *
    112         * @see #getSubLabelFont()
    113         */
    114        public void setSubLabelFont(Font font) {
    115            if (font == null) {
    116                throw new IllegalArgumentException("Null 'font' argument.");
    117            }
    118            this.sublabelFont = font;
    119            notifyListeners(new AxisChangeEvent(this));
    120        }
    121
    122        /**
    123         * Returns the paint for the sublabels.
    124         *
    125         * @return The paint (never <code>null</code>).
    126         *
    127         * @see #setSubLabelPaint(Paint)
    128         */
    129        public Paint getSubLabelPaint() {
    130            return this.sublabelPaint;
    131        }
    132
    133        /**
    134         * Sets the paint for the sublabels and sends an {@link AxisChangeEvent}
    135         * to all registered listeners.
    136         *
    137         * @param paint  the paint (<code>null</code> not permitted).
    138         *
    139         * @see #getSubLabelPaint()
    140         */
    141        public void setSubLabelPaint(Paint paint) {
    142            if (paint == null) {
    143                throw new IllegalArgumentException("Null 'paint' argument.");
    144            }
    145            this.sublabelPaint = paint;
    146            notifyListeners(new AxisChangeEvent(this));
    147        }
    148
    149        /**
    150         * Adds a sublabel for a category.
    151         *
    152         * @param category  the category.
    153         * @param label  the label.
    154         */
    155        public void addSubLabel(Comparable category, String label) {
    156            this.sublabels.put(category, label);
    157        }
    158
    159        /**
    160         * Overrides the default behaviour by adding the sublabel to the text
    161         * block that is used for the category label.
    162         *
    163         * @param category  the category.
    164         * @param width  the width (not used yet).
    165         * @param edge  the location of the axis.
    166         * @param g2  the graphics device.
    167         *
    168         * @return A label.
    169         */
    170        protected TextBlock createLabel(Comparable category, float width,
    171                                        RectangleEdge edge, Graphics2D g2) {
    172            TextBlock label = super.createLabel(category, width, edge, g2);
    173            String s = (String) this.sublabels.get(category);
    174            if (s != null) {
    175                if (edge == RectangleEdge.TOP || edge == RectangleEdge.BOTTOM) {
    176                    TextLine line = new TextLine(s, this.sublabelFont,
    177                            this.sublabelPaint);
    178                    label.addLine(line);
    179                }
    180                else if (edge == RectangleEdge.LEFT
    181                        || edge == RectangleEdge.RIGHT) {
    182                    TextLine line = label.getLastLine();
    183                    if (line != null) {
    184                        line.addFragment(new TextFragment("  " + s,
    185                                this.sublabelFont, this.sublabelPaint));
    186                    }
    187                }
    188            }
    189            return label;
    190        }
    191
    192        /**
    193         * Tests this axis for equality with an arbitrary object.
    194         *
    195         * @param obj  the object (<code>null</code> permitted).
    196         *
    197         * @return A boolean.
    198         */
    199        public boolean equals(Object obj) {
    200            if (obj == this) {
    201                return true;
    202            }
    203            if (!(obj instanceof ExtendedCategoryAxis)) {
    204                return false;
    205            }
    206            ExtendedCategoryAxis that = (ExtendedCategoryAxis) obj;
    207            if (!this.sublabelFont.equals(that.sublabelFont)) {
    208                return false;
    209            }
    210            if (!PaintUtilities.equal(this.sublabelPaint, that.sublabelPaint)) {
    211                return false;
    212            }
    213            if (!this.sublabels.equals(that.sublabels)) {
    214                return false;
    215            }
    216            return super.equals(obj);
    217        }
    218
    219        /**
    220         * Returns a clone of this axis.
    221         *
    222         * @return A clone.
    223         *
    224         * @throws CloneNotSupportedException if there is a problem cloning.
    225         */
    226        public Object clone() throws CloneNotSupportedException {
    227            ExtendedCategoryAxis clone = (ExtendedCategoryAxis) super.clone();
    228            clone.sublabels = new HashMap(this.sublabels);
    229            return clone;
    230        }
    231
    232        /**
    233         * Provides serialization support.
    234         *
    235         * @param stream  the output stream.
    236         *
    237         * @throws IOException  if there is an I/O error.
    238         */
    239        private void writeObject(ObjectOutputStream stream) throws IOException {
    240            stream.defaultWriteObject();
    241            SerialUtilities.writePaint(this.sublabelPaint, stream);
    242        }
    243
    244        /**
    245         * Provides serialization support.
    246         *
    247         * @param stream  the input stream.
    248         *
    249         * @throws IOException  if there is an I/O error.
    250         * @throws ClassNotFoundException  if there is a classpath problem.
    251         */
    252        private void readObject(ObjectInputStream stream)
    253            throws IOException, ClassNotFoundException {
    254            stream.defaultReadObject();
    255            this.sublabelPaint = SerialUtilities.readPaint(stream);
    256        }
    257
    258    }