combineddomainxyplot.java

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/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -------------------------
 * CombinedDomainXYPlot.java
 * -------------------------
 * (C) Copyright 2001-2003, by Bill Kelemen and Contributors.
 *
 * Original Author:  Bill Kelemen;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Anthony Boulestreau;
 *                   David Basten;
 *                   Kevin Frechette (for ISTI);
 *
 * $Id: CombinedDomainXYPlot.java,v 1.12 2003/08/08 09:46:53 mungady Exp $
 *
 * Changes:
 * --------
 * 06-Dec-2001 : Version 1 (BK);
 * 12-Dec-2001 : Removed unnecessary 'throws' clause from constructor (DG);
 * 18-Dec-2001 : Added plotArea attribute and get/set methods (BK);
 * 22-Dec-2001 : Fixed bug in chartChanged with multiple combinations of CombinedPlots (BK);
 * 08-Jan-2002 : Moved to new package com.jrefinery.chart.combination (DG);
 * 25-Feb-2002 : Updated import statements (DG);
 * 28-Feb-2002 : Readded "this.plotArea = plotArea" that was deleted from draw() method (BK);
 * 26-Mar-2002 : Added an empty zoom method (this method needs to be written so that combined
 *               plots will support zooming (DG);
 * 29-Mar-2002 : Changed the method createCombinedAxis adding the creation of OverlaidSymbolicAxis
 *               and CombinedSymbolicAxis(AB);
 * 23-Apr-2002 : Renamed CombinedPlot-->MultiXYPlot, and simplified the structure (DG);
 * 23-May-2002 : Renamed (again) MultiXYPlot-->CombinedXYPlot (DG);
 * 19-Jun-2002 : Added get/setGap() methods suggested by David Basten (DG);
 * 25-Jun-2002 : Removed redundant imports (DG);
 * 16-Jul-2002 : Draws shared axis after subplots (to fix missing gridlines),
 *               added overrides of 'setSeriesPaint()' and 'setXYItemRenderer()'
 *               that pass changes down to subplots (KF);
 * 09-Oct-2002 : Added add(XYPlot) method (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 16-May-2003 : Renamed CombinedXYPlot --> CombinedDomainXYPlot (DG);
 * 04-Aug-2003 : Removed leftover code that was causing domain axis drawing problem (DG);
 * 08-Aug-2003 : Adjusted totalWeight in remove(...) method (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.axis.AxisSpace;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.renderer.XYItemRenderer;
import org.jfree.data.Range;
import org.jfree.ui.RectangleEdge;

/**
 * An extension of {@link XYPlot} that contains multiple subplots that share a common domain axis.
 *
 * @author Bill Kelemen ([e-mail]).
 * @author David Gilbert.
 */
public class CombinedDomainXYPlot extends XYPlot implements Serializable {

    /** Storage for the subplot references. */
    private List subplots;

    /** Total weight of all charts. */
    private int totalWeight = 0;

    /** The gap between subplots. */
    private double gap = 5.0;

    /** Temporary storage for the subplot areas. */
    private Rectangle2D[] subplotAreas;

    /**
     * Default constructor.
     */
    public CombinedDomainXYPlot() {
        this(new NumberAxis());      
    }
    
    /**
     * Creates a new combined plot that shares a domain axis among multiple subplots.
     *
     * @param domainAxis  the shared axis.
     */
    public CombinedDomainXYPlot(ValueAxis domainAxis) {

        super(
            null,        // no data in the parent plot
            domainAxis,
            null,        // no range axis
            null         // no rendereer
        );  

        this.subplots = new java.util.ArrayList();

    }

    /**
     * Returns a string describing the type of plot.
     *
     * @return The type of plot.
     */
    public String getPlotType() {

        return "Combined Domain XYPlot";

    }

    /**
     * Sets the orientation for the plot (also changes the orientation for all the subplots
     * to match).
     * 
     * @param orientation  the orientation.
     */
    public void setOrientation(PlotOrientation orientation) {

        super.setOrientation(orientation);

        Iterator iterator = subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setOrientation(orientation);
        }

    }

    /**
     * Returns the range for the axis.  This is the combined range of all the subplots.
     *
     * @param axis  the axis.
     *
     * @return The range.
     */
    public Range getDataRange(ValueAxis axis) {

        Range result = null;

        if (subplots != null) {
            Iterator iterator = subplots.iterator();
            while (iterator.hasNext()) {
                XYPlot subplot = (XYPlot) iterator.next();
                result = Range.combine(result, subplot.getDataRange(axis));
            }
        }

        return result;

    }

    /**
     * Returns the space between subplots.
     *
     * @return the gap
     */
    public double getGap() {
        return gap;
    }

    /**
     * Sets the amount of space between subplots.
     *
     * @param gap  the gap between subplots
     */
    public void setGap(double gap) {
        this.gap = gap;
    }

    /**
     * Adds a subplot, with a default 'weight' of 1.
     * <P>
     * The subplot should have a null domain axis.
     *
     * @param subplot  the subplot.
     */
    public void add(XYPlot subplot) {
        add(subplot, 1);
    }

    /**
     * Adds a subplot with a particular weight (greater than or equal to one).  The weight
     * determines how much space is allocated to the subplot relative to all the other subplots.
     * <P>
     * The domain axis for the subplot will be set to <code>null</code>.
     *
     * @param subplot  the subplot.
     * @param weight  the weight (must be 1 or greater).
     */
    public void add(XYPlot subplot, int weight) {

        // verify valid weight
        if (weight <= 0) {
            String msg = "SharedDomainXYPlot.add(...): weight must be positive.";
            throw new IllegalArgumentException(msg);
        }

        // store the plot and its weight
        subplot.setParent(this);
        subplot.setWeight(weight);
        subplot.setInsets(new Insets(0, 0, 0, 0));
        subplot.setDomainAxis(null);
        this.subplots.add(subplot);

        // keep track of total weights
        this.totalWeight += weight;

        ValueAxis axis = getDomainAxis();
        if (axis != null) {
            axis.configure();
        }
        
        notifyListeners(new PlotChangeEvent(this));

    }

    /**
     * Removes a subplot from the combined chart.
     *
     * @param subplot  the subplot.
     */
    public void remove(XYPlot subplot) {