combineddomaincategoryplot.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------------------
 * CombinedDomainCategoryPlot.java
 * -------------------------------
 * (C) Copyright 2003-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Nicolas Brodu;
 *
 * $Id: CombinedDomainCategoryPlot.java,v 1.9 2005/05/19 14:03:40 mungady Exp $
 *
 * Changes:
 * --------
 * 16-May-2003 : Version 1 (DG);
 * 08-Aug-2003 : Adjusted totalWeight in remove() method (DG);
 * 19-Aug-2003 : Added equals() method, implemented Cloneable and 
 *               Serializable (DG);
 * 11-Sep-2003 : Fix cloning support (subplots) (NB);
 * 15-Sep-2003 : Implemented PublicCloneable (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 17-Sep-2003 : Updated handling of 'clicks' (DG);
 * 04-May-2004 : Added getter/setter methods for 'gap' attribute (DG);
 * 12-Nov-2004 : Implemented the Zoomable interface (DG);
 * 25-Nov-2004 : Small update to clone() implementation (DG);
 * 21-Feb-2005 : The getLegendItems() method now returns the fixed legend
 *               items if set (DG);
 * 05-May-2005 : Updated draw() method parameters (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Graphics2D;
import java.awt.geom.Point2D;
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.LegendItemCollection;
import org.jfree.chart.axis.AxisSpace;
import org.jfree.chart.axis.AxisState;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.event.PlotChangeListener;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A combined category plot where the domain axis is shared.
 */
public class CombinedDomainCategoryPlot extends CategoryPlot
                                        implements Zoomable,
                                                   Cloneable, PublicCloneable, 
                                                   Serializable,
                                                   PlotChangeListener {

    /** For serialization. */
    private static final long serialVersionUID = 8207194522653701572L;
    
    /** Storage for the subplot references. */
    private List subplots;

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

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

    /** Temporary storage for the subplot areas. */
    private transient Rectangle2D[] subplotAreas;
    // TODO:  move the above to the plot state
    
    /**
     * Default constructor.
     */
    public CombinedDomainCategoryPlot() {
        this(new CategoryAxis());
    }
    
    /**
     * Creates a new plot.
     *
     * @param domainAxis  the shared domain axis (<code>null</code> not 
     *                    permitted).
     */
    public CombinedDomainCategoryPlot(CategoryAxis domainAxis) {
        super(null, domainAxis, null, null);
        this.subplots = new java.util.ArrayList();
        this.totalWeight = 0;
        this.gap = 5.0;
    }

    /**
     * Returns the space between subplots.
     *
     * @return The gap (in Java2D units).
     */
    public double getGap() {
        return this.gap;
    }

    /**
     * Sets the amount of space between subplots and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param gap  the gap between subplots (in Java2D units).
     */
    public void setGap(double gap) {
        this.gap = gap;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Adds a subplot to the combined chart and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     * 
     * @param subplot  the subplot (<code>null</code> not permitted).
     */
    public void add(CategoryPlot subplot) {
        add(subplot, 1);    
    }
    
    /**
     * Adds a subplot to the combined chart and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     *
     * @param subplot  the subplot (<code>null</code> not permitted).
     * @param weight  the weight (must be >= 1).
     */
    public void add(CategoryPlot subplot, int weight) {
        if (subplot == null) {
            throw new IllegalArgumentException("Null 'subplot' argument.");
        }
        if (weight < 1) {
            throw new IllegalArgumentException("Require weight >= 1.");
        }
        subplot.setParent(this);
        subplot.setWeight(weight);
        subplot.setInsets(new RectangleInsets(0.0, 0.0, 0.0, 0.0));
        subplot.setDomainAxis(null);
        subplot.setOrientation(getOrientation());
        subplot.addChangeListener(this);
        this.subplots.add(subplot);
        this.totalWeight += weight;
        CategoryAxis axis = getDomainAxis();
        if (axis != null) {
            axis.configure();
        }
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Removes a subplot from the combined chart.  Potentially, this removes 
     * some unique categories from the overall union of the datasets...so the 
     * domain axis is reconfigured, then a {@link PlotChangeEvent} is sent to 
     * all registered listeners.
     *
     * @param subplot  the subplot (<code>null</code> not permitted).
     */
    public void remove(CategoryPlot subplot) {
        if (subplot == null) {
            throw new IllegalArgumentException("Null 'subplot' argument.");
        }
        int position = -1;
        int size = this.subplots.size();
        int i = 0;
        while (position == -1 && i < size) {
            if (this.subplots.get(i) == subplot) {
                position = i;
            }
            i++;
        }
        if (position != -1) {
            this.subplots.remove(position);
            subplot.setParent(null);
            subplot.removeChangeListener(this);
            this.totalWeight -= subplot.getWeight();

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

    /**
     * Returns the list of subplots.
     *
     * @return An unmodifiable list of subplots .
     */
    public List getSubplots() {
        return Collections.unmodifiableList(this.subplots);
    }

    /**
     * Returns the subplot (if any) that contains the (x, y) point (specified 
     * in Java2D space).
     * 
     * @param info  the chart rendering info.
     * @param source  the source point.
     * 
     * @return A subplot (possibly <code>null</code>).
     */
    public CategoryPlot findSubplot(PlotRenderingInfo info, Point2D source) {
        CategoryPlot result = null;
        int subplotIndex = info.getSubplotIndex(source);
        if (subplotIndex >= 0) {
            result =  (CategoryPlot) this.subplots.get(subplotIndex);
        }
        return result;
    }
    
    /**
     * Multiplies the range on the range axis/axes by the specified factor.
     *
     * @param factor  the zoom factor.
     * @param info  the plot rendering info.
     * @param source  the source point.
     */
    public void zoomRangeAxes(double factor, PlotRenderingInfo info, 
                              Point2D source) {
        CategoryPlot subplot = findSubplot(info, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(factor, info, source);
        }
    }

    /**
     * Zooms in on the range axes.
     *
     * @param lowerPercent  the lower bound.
     * @param upperPercent  the upper bound.
     * @param info  the plot rendering info.
     * @param source  the source point.
     */
    public void zoomRangeAxes(double lowerPercent, double upperPercent, 
                              PlotRenderingInfo info, Point2D source) {
        CategoryPlot subplot = findSubplot(info, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
        }
    }

    /**
     * Calculates the space required for the axes.
     * 
     * @param g2  the graphics device.
     * @param plotArea  the plot area.
     * 
     * @return The space required for the axes.
     */
    protected AxisSpace calculateAxisSpace(Graphics2D g2, 
                                           Rectangle2D plotArea) {
        
        AxisSpace space = new AxisSpace();
        PlotOrientation orientation = getOrientation();
        
        // work out the space required by the domain axis...
        AxisSpace fixed = getFixedDomainAxisSpace();
        if (fixed != null) {
            if (orientation == PlotOrientation.HORIZONTAL) {
                space.setLeft(fixed.getLeft());
                space.setRight(fixed.getRight());
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space.setTop(fixed.getTop());
                space.setBottom(fixed.getBottom());                
            }
        }
        else {