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jfreechart example source code file (ExtendedCategoryAxis.java)

This example jfreechart source code file (ExtendedCategoryAxis.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, axischangeevent, extendedcategoryaxis, extendedcategoryaxis, font, font, illegalargumentexception, io, ioexception, null, paint, string, string, textblock, textline, textline, util

The jfreechart ExtendedCategoryAxis.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -------------------------
 * ExtendedCategoryAxis.java
 * -------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 07-Nov-2003 : Version 1 (DG);
 * 07-Jan-2004 : Updated the createLabel() method (DG);
 * 29-Jan-2004 : Added paint attribute (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 21-Mar-2007 : Implemented equals(), clone() and fixed serialization (DG);
 *
 */

package org.jfree.chart.axis;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;

import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextBlock;
import org.jfree.text.TextFragment;
import org.jfree.text.TextLine;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PaintUtilities;

/**
 * An extended version of the {@link CategoryAxis} class that supports
 * sublabels on the axis.
 */
public class ExtendedCategoryAxis extends CategoryAxis {

    /** For serialization. */
    static final long serialVersionUID = -3004429093959826567L;

    /** Storage for the sublabels. */
    private Map sublabels;

    /** The sublabel font. */
    private Font sublabelFont;

    /** The sublabel paint. */
    private transient Paint sublabelPaint;

    /**
     * Creates a new axis.
     *
     * @param label  the axis label.
     */
    public ExtendedCategoryAxis(String label) {
        super(label);
        this.sublabels = new HashMap();
        this.sublabelFont = new Font("SansSerif", Font.PLAIN, 10);
        this.sublabelPaint = Color.black;
    }

    /**
     * Returns the font for the sublabels.
     *
     * @return The font (never <code>null).
     *
     * @see #setSubLabelFont(Font)
     */
    public Font getSubLabelFont() {
        return this.sublabelFont;
    }

    /**
     * Sets the font for the sublabels and sends an {@link AxisChangeEvent} to
     * all registered listeners.
     *
     * @param font  the font (<code>null not permitted).
     *
     * @see #getSubLabelFont()
     */
    public void setSubLabelFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.sublabelFont = font;
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Returns the paint for the sublabels.
     *
     * @return The paint (never <code>null).
     *
     * @see #setSubLabelPaint(Paint)
     */
    public Paint getSubLabelPaint() {
        return this.sublabelPaint;
    }

    /**
     * Sets the paint for the sublabels and sends an {@link AxisChangeEvent}
     * to all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getSubLabelPaint()
     */
    public void setSubLabelPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.sublabelPaint = paint;
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Adds a sublabel for a category.
     *
     * @param category  the category.
     * @param label  the label.
     */
    public void addSubLabel(Comparable category, String label) {
        this.sublabels.put(category, label);
    }

    /**
     * Overrides the default behaviour by adding the sublabel to the text
     * block that is used for the category label.
     *
     * @param category  the category.
     * @param width  the width (not used yet).
     * @param edge  the location of the axis.
     * @param g2  the graphics device.
     *
     * @return A label.
     */
    protected TextBlock createLabel(Comparable category, float width,
                                    RectangleEdge edge, Graphics2D g2) {
        TextBlock label = super.createLabel(category, width, edge, g2);
        String s = (String) this.sublabels.get(category);
        if (s != null) {
            if (edge == RectangleEdge.TOP || edge == RectangleEdge.BOTTOM) {
                TextLine line = new TextLine(s, this.sublabelFont,
                        this.sublabelPaint);
                label.addLine(line);
            }
            else if (edge == RectangleEdge.LEFT
                    || edge == RectangleEdge.RIGHT) {
                TextLine line = label.getLastLine();
                if (line != null) {
                    line.addFragment(new TextFragment("  " + s,
                            this.sublabelFont, this.sublabelPaint));
                }
            }
        }
        return label;
    }

    /**
     * Tests this axis for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof ExtendedCategoryAxis)) {
            return false;
        }
        ExtendedCategoryAxis that = (ExtendedCategoryAxis) obj;
        if (!this.sublabelFont.equals(that.sublabelFont)) {
            return false;
        }
        if (!PaintUtilities.equal(this.sublabelPaint, that.sublabelPaint)) {
            return false;
        }
        if (!this.sublabels.equals(that.sublabels)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a clone of this axis.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        ExtendedCategoryAxis clone = (ExtendedCategoryAxis) super.clone();
        clone.sublabels = new HashMap(this.sublabels);
        return clone;
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.sublabelPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.sublabelPaint = SerialUtilities.readPaint(stream);
    }

}

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