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jfreechart example source code file (PolarChartPanel.java)

This example jfreechart source code file (PolarChartPanel.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

auto, awt, event, gui, in, jmenuitem, jmenuitem, out, polar, polarchartpanel, polarplot, polarplot, range, string, string, swing, zoom, zoom

The jfreechart PolarChartPanel.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.]
 *
 * --------------------
 * PolarChartPanel.java
 * --------------------
 * (C) Copyright 2004-2008, by Solution Engineering, Inc. and Contributors.
 *
 * Original Author:  Daniel Bridenbecker, Solution Engineering, Inc.;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 19-Jan-2004 : Version 1, contributed by DB with minor changes by DG (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart;

import java.awt.Component;
import java.awt.event.ActionEvent;

import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PolarPlot;

/**
 * <code>PolarChartPanel is the top level object for using the
 * {@link PolarPlot}. Since this class has a <code>JPanel in the
 * inheritance hierarchy, one uses this class to integrate the Polar plot into
 * their application.
 * <p>
 * The main modification to <code>ChartPanel is the popup menu.  It
 * removes <code>ChartPanel's versions of:
 * <ul>
 *    <li>Zoom In
 *    <li>Zoom Out
 *    <li>Auto Range
 * </ul>
 * and replaces them with versions more appropriate for {@link PolarPlot}.
 */
public class PolarChartPanel extends ChartPanel {

    // -----------------
    // --- Constants ---
    // -----------------

    /** Zoom in command string. */
    private static final String POLAR_ZOOM_IN_ACTION_COMMAND = "Polar Zoom In";

    /** Zoom out command string. */
    private static final String POLAR_ZOOM_OUT_ACTION_COMMAND
        = "Polar Zoom Out";

    /** Auto range command string. */
    private static final String POLAR_AUTO_RANGE_ACTION_COMMAND
        = "Polar Auto Range";

    // ------------------------
    // --- Member Variables ---
    // ------------------------

    // --------------------
    // --- Constructors ---
    // --------------------
    /**
     * Constructs a JFreeChart panel.
     *
     * @param chart  the chart.
     */
    public PolarChartPanel(JFreeChart chart) {
        this(chart, true);
    }

    /**
     * Creates a new panel.
     *
     * @param chart  the chart.
     * @param useBuffer  buffered?
     */
    public PolarChartPanel(JFreeChart chart, boolean useBuffer) {
        super(chart, useBuffer);
        checkChart(chart);
        setMinimumDrawWidth(200);
        setMinimumDrawHeight(200);
        setMaximumDrawWidth(2000);
        setMaximumDrawHeight(2000);
    }

    // --------------------------
    // --- ChartPanel Methods ---
    // --------------------------
    /**
     * Sets the chart that is displayed in the panel.
     *
     * @param chart  The chart.
     */
    public void setChart(JFreeChart chart) {
        checkChart(chart);
        super.setChart(chart);
    }

    /**
     * Creates a popup menu for the panel.
     *
     * @param properties  include a menu item for the chart property editor.
     * @param save  include a menu item for saving the chart.
     * @param print  include a menu item for printing the chart.
     * @param zoom  include menu items for zooming.
     *
     * @return The popup menu.
     */
    protected JPopupMenu createPopupMenu(boolean properties,
                                         boolean save,
                                         boolean print,
                                         boolean zoom) {

       JPopupMenu result = super.createPopupMenu(properties, save, print, zoom);
       int zoomInIndex  = getPopupMenuItem(result, "Zoom In");
       int zoomOutIndex = getPopupMenuItem(result, "Zoom Out");
       int autoIndex     = getPopupMenuItem(result, "Auto Range");
       if (zoom) {
           JMenuItem zoomIn = new JMenuItem("Zoom In");
           zoomIn.setActionCommand(POLAR_ZOOM_IN_ACTION_COMMAND);
           zoomIn.addActionListener(this);

           JMenuItem zoomOut = new JMenuItem("Zoom Out");
           zoomOut.setActionCommand(POLAR_ZOOM_OUT_ACTION_COMMAND);
           zoomOut.addActionListener(this);

           JMenuItem auto = new JMenuItem("Auto Range");
           auto.setActionCommand(POLAR_AUTO_RANGE_ACTION_COMMAND);
           auto.addActionListener(this);

           if (zoomInIndex != -1) {
               result.remove(zoomInIndex);
           }
           else {
               zoomInIndex = result.getComponentCount() - 1;
           }
           result.add(zoomIn, zoomInIndex);
           if (zoomOutIndex != -1) {
               result.remove(zoomOutIndex);
           }
           else {
               zoomOutIndex = zoomInIndex + 1;
           }
           result.add(zoomOut, zoomOutIndex);
           if (autoIndex != -1) {
               result.remove(autoIndex);
           }
           else {
               autoIndex = zoomOutIndex + 1;
           }
           result.add(auto, autoIndex);
       }
       return result;
    }

    /**
     * Handles action events generated by the popup menu.
     *
     * @param event  the event.
     */
    public void actionPerformed(ActionEvent event) {
       String command = event.getActionCommand();

       if (command.equals(POLAR_ZOOM_IN_ACTION_COMMAND)) {
           PolarPlot plot = (PolarPlot) getChart().getPlot();
           plot.zoom(0.5);
       }
       else if (command.equals(POLAR_ZOOM_OUT_ACTION_COMMAND)) {
           PolarPlot plot = (PolarPlot) getChart().getPlot();
           plot.zoom(2.0);
       }
       else if (command.equals(POLAR_AUTO_RANGE_ACTION_COMMAND)) {
           PolarPlot plot = (PolarPlot) getChart().getPlot();
           plot.getAxis().setAutoRange(true);
       }
       else {
           super.actionPerformed(event);
       }
    }

    // ----------------------
    // --- Public Methods ---
    // ----------------------

    // -----------------------
    // --- Private Methods ---
    // -----------------------

    /**
     * Test that the chart is using an xy plot with time as the domain axis.
     *
     * @param chart  the chart.
     */
    private void checkChart(JFreeChart chart) {
        Plot plot = chart.getPlot();
        if (!(plot instanceof PolarPlot)) {
            throw new IllegalArgumentException("plot is not a PolarPlot");
       }
    }

    /**
     * Returns the index of an item in a popup menu.
     *
     * @param menu  the menu.
     * @param text  the label.
     *
     * @return The item index.
     */
    private int getPopupMenuItem(JPopupMenu menu, String text) {
        int index = -1;
        for (int i = 0; (index == -1) && (i < menu.getComponentCount()); i++) {
            Component comp = menu.getComponent(i);
            if (comp instanceof JMenuItem) {
                JMenuItem item = (JMenuItem) comp;
                if (text.equals(item.getText())) {
                    index = i;
                }
            }
       }
       return index;
    }

}

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