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jfreechart example source code file (CombinedDomainXYPlot.java)

This example jfreechart source code file (CombinedDomainXYPlot.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, axisspace, combineddomainxyplot, combineddomainxyplot, geometry, illegalargumentexception, iterator, iterator, legenditemcollection, plotrenderinginfo, plotrenderinginfo, point2d, rectangle2d, util, valueaxis, xyplot, xyplot

The jfreechart CombinedDomainXYPlot.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.]
 *
 * -------------------------
 * CombinedDomainXYPlot.java
 * -------------------------
 * (C) Copyright 2001-2008, 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);
 *                   Nicolas Brodu;
 *                   Petr Kubanek (bug 1606205);
 *
 * 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);
 * 21-Aug-2003 : Implemented Cloneable (DG);
 * 11-Sep-2003 : Fix cloning support (subplots) (NB);
 * 15-Sep-2003 : Fixed error in cloning (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 17-Sep-2003 : Updated handling of 'clicks' (DG);
 * 12-Nov-2004 : Implemented the new 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 : Removed unused draw() method (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 23-Aug-2006 : Override setFixedRangeAxisSpace() to update subplots (DG);
 * 06-Feb-2007 : Fixed bug 1606205, draw shared axis after subplots (DG);
 * 23-Mar-2007 : Reverted previous patch (bug fix 1606205) (DG);
 * 17-Apr-2007 : Added null argument checks to findSubplot() (DG);
 * 27-Nov-2007 : Modified setFixedRangeAxisSpaceForSubplots() so as not to
 *               trigger change event in subplots (DG);
 * 28-Jan-2008 : Reset fixed range axis space in subplots for each call to
 *               draw() (DG);
 * 27-Mar-2008 : Add documentation for getDataRange() method (DG);
 * 31-Mar-2008 : Updated getSubplots() to return EMPTY_LIST for null
 *               subplots, as suggested by Richard West (DG);
 * 28-Apr-2008 : Fixed zooming problem (see bug 1950037) (DG);
 * 11-Aug-2008 : Don't store totalWeight of subplots, calculate it as
 *               required (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
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.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.event.PlotChangeListener;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.Range;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;

/**
 * An extension of {@link XYPlot} that contains multiple subplots that share a
 * common domain axis.
 */
public class CombinedDomainXYPlot extends XYPlot
        implements PlotChangeListener {

    /** For serialization. */
    private static final long serialVersionUID = -7765545541261907383L;

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

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

    /** Temporary storage for the subplot areas. */
    private transient Rectangle2D[] subplotAreas;
    // TODO:  the subplot areas needs to be moved out of the plot into the plot
    //        state

    /**
     * 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 (<code>null not allowed).
     */
    public void setOrientation(PlotOrientation orientation) {

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

    }

    /**
     * Returns a range representing the extent of the data values in this plot
     * (obtained from the subplots) that will be rendered against the specified
     * axis.  NOTE: This method is intended for internal JFreeChart use, and
     * is public only so that code in the axis classes can call it.  Since
     * only the domain axis is shared between subplots, the JFreeChart code
     * will only call this method for the domain values (although this is not
     * checked/enforced).
     *
     * @param axis  the axis.
     *
     * @return The range (possibly <code>null).
     */
    public Range getDataRange(ValueAxis axis) {
        Range result = null;
        if (this.subplots != null) {
            Iterator iterator = this.subplots.iterator();
            while (iterator.hasNext()) {
                XYPlot subplot = (XYPlot) iterator.next();
                result = Range.combine(result, subplot.getDataRange(axis));
            }
        }
        return result;
    }

    /**
     * Returns the gap between subplots, measured in Java2D units.
     *
     * @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;
        fireChangeEvent();
    }

    /**
     * Adds a subplot (with a default 'weight' of 1) and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     * <P>
     * The domain axis for the subplot will be set to <code>null.  You
     * must ensure that the subplot has a non-null range axis.
     *
     * @param subplot  the subplot (<code>null not permitted).
     */
    public void add(XYPlot subplot) {
        // defer argument checking
        add(subplot, 1);
    }

    /**
     * Adds a subplot with the specified weight and sends a
     * {@link PlotChangeEvent} to all registered listeners.  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.  You
     * must ensure that the subplot has a non-null range axis.
     *
     * @param subplot  the subplot (<code>null not permitted).
     * @param weight  the weight (must be >= 1).
     */
    public void add(XYPlot subplot, int weight) {

        if (subplot == null) {
            throw new IllegalArgumentException("Null 'subplot' argument.");
        }
        if (weight <= 0) {
            throw new IllegalArgumentException("Require weight >= 1.");
        }

        // store the plot and its weight
        subplot.setParent(this);
        subplot.setWeight(weight);
        subplot.setInsets(new RectangleInsets(0.0, 0.0, 0.0, 0.0), false);
        subplot.setDomainAxis(null);
        subplot.addChangeListener(this);
        this.subplots.add(subplot);

        ValueAxis axis = getDomainAxis();
        if (axis != null) {
            axis.configure();
        }
        fireChangeEvent();
    }

    /**
     * Removes a subplot from the combined chart and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param subplot  the subplot (<code>null not permitted).
     */
    public void remove(XYPlot 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);
            ValueAxis domain = getDomainAxis();
            if (domain != null) {
                domain.configure();
            }
            fireChangeEvent();
        }
    }

    /**
     * Returns the list of subplots.  The returned list may be empty, but is
     * never <code>null.
     *
     * @return An unmodifiable list of subplots.
     */
    public List getSubplots() {
        if (this.subplots != null) {
            return Collections.unmodifiableList(this.subplots);
        }
        else {
            return Collections.EMPTY_LIST;
        }
    }

    /**
     * Calculates the axis space required.
     *
     * @param g2  the graphics device.
     * @param plotArea  the plot area.
     *
     * @return The space.
     */
    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 {
            ValueAxis xAxis = getDomainAxis();
            RectangleEdge xEdge = Plot.resolveDomainAxisLocation(
                    getDomainAxisLocation(), orientation);
            if (xAxis != null) {
                space = xAxis.reserveSpace(g2, this, plotArea, xEdge, space);
            }
        }

        Rectangle2D adjustedPlotArea = space.shrink(plotArea, null);

        // work out the maximum height or width of the non-shared axes...
        int n = this.subplots.size();
        int totalWeight = 0;
        for (int i = 0; i < n; i++) {
            XYPlot sub = (XYPlot) this.subplots.get(i);
            totalWeight += sub.getWeight();
        }
        this.subplotAreas = new Rectangle2D[n];
        double x = adjustedPlotArea.getX();
        double y = adjustedPlotArea.getY();
        double usableSize = 0.0;
        if (orientation == PlotOrientation.HORIZONTAL) {
            usableSize = adjustedPlotArea.getWidth() - this.gap * (n - 1);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            usableSize = adjustedPlotArea.getHeight() - this.gap * (n - 1);
        }

        for (int i = 0; i < n; i++) {
            XYPlot plot = (XYPlot) this.subplots.get(i);

            // calculate sub-plot area
            if (orientation == PlotOrientation.HORIZONTAL) {
                double w = usableSize * plot.getWeight() / totalWeight;
                this.subplotAreas[i] = new Rectangle2D.Double(x, y, w,
                        adjustedPlotArea.getHeight());
                x = x + w + this.gap;
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                double h = usableSize * plot.getWeight() / totalWeight;
                this.subplotAreas[i] = new Rectangle2D.Double(x, y,
                        adjustedPlotArea.getWidth(), h);
                y = y + h + this.gap;
            }

            AxisSpace subSpace = plot.calculateRangeAxisSpace(g2,
                    this.subplotAreas[i], null);
            space.ensureAtLeast(subSpace);

        }

        return space;
    }

    /**
     * Draws the plot within the specified area on a graphics device.
     *
     * @param g2  the graphics device.
     * @param area  the plot area (in Java2D space).
     * @param anchor  an anchor point in Java2D space (<code>null
     *                permitted).
     * @param parentState  the state from the parent plot, if there is one
     *                     (<code>null permitted).
     * @param info  collects chart drawing information (<code>null
     *              permitted).
     */
    public void draw(Graphics2D g2,
                     Rectangle2D area,
                     Point2D anchor,
                     PlotState parentState,
                     PlotRenderingInfo info) {

        // set up info collection...
        if (info != null) {
            info.setPlotArea(area);
        }

        // adjust the drawing area for plot insets (if any)...
        RectangleInsets insets = getInsets();
        insets.trim(area);

        setFixedRangeAxisSpaceForSubplots(null);
        AxisSpace space = calculateAxisSpace(g2, area);
        Rectangle2D dataArea = space.shrink(area, null);

        // set the width and height of non-shared axis of all sub-plots
        setFixedRangeAxisSpaceForSubplots(space);

        // draw the shared axis
        ValueAxis axis = getDomainAxis();
        RectangleEdge edge = getDomainAxisEdge();
        double cursor = RectangleEdge.coordinate(dataArea, edge);
        AxisState axisState = axis.draw(g2, cursor, area, dataArea, edge, info);
        if (parentState == null) {
            parentState = new PlotState();
        }
        parentState.getSharedAxisStates().put(axis, axisState);

        // draw all the subplots
        for (int i = 0; i < this.subplots.size(); i++) {
            XYPlot plot = (XYPlot) this.subplots.get(i);
            PlotRenderingInfo subplotInfo = null;
            if (info != null) {
                subplotInfo = new PlotRenderingInfo(info.getOwner());
                info.addSubplotInfo(subplotInfo);
            }
            plot.draw(g2, this.subplotAreas[i], anchor, parentState,
                    subplotInfo);
        }

        if (info != null) {
            info.setDataArea(dataArea);
        }

    }

    /**
     * Returns a collection of legend items for the plot.
     *
     * @return The legend items.
     */
    public LegendItemCollection getLegendItems() {
        LegendItemCollection result = getFixedLegendItems();
        if (result == null) {
            result = new LegendItemCollection();
            if (this.subplots != null) {
                Iterator iterator = this.subplots.iterator();
                while (iterator.hasNext()) {
                    XYPlot plot = (XYPlot) iterator.next();
                    LegendItemCollection more = plot.getLegendItems();
                    result.addAll(more);
                }
            }
        }
        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 (<code>null not permitted).
     * @param source  the source point (<code>null not permitted).
     */
    public void zoomRangeAxes(double factor, PlotRenderingInfo info,
                              Point2D source) {
        zoomRangeAxes(factor, info, source, false);
    }

    /**
     * Multiplies the range on the range axis/axes by the specified factor.
     *
     * @param factor  the zoom factor.
     * @param state  the plot state.
     * @param source  the source point (in Java2D coordinates).
     * @param useAnchor  use source point as zoom anchor?
     */
    public void zoomRangeAxes(double factor, PlotRenderingInfo state,
                              Point2D source, boolean useAnchor) {
        // delegate 'state' and 'source' argument checks...
        XYPlot subplot = findSubplot(state, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(factor, state, source, useAnchor);
        }
        else {
            // if the source point doesn't fall within a subplot, we do the
            // zoom on all subplots...
            Iterator iterator = getSubplots().iterator();
            while (iterator.hasNext()) {
                subplot = (XYPlot) iterator.next();
                subplot.zoomRangeAxes(factor, state, source, useAnchor);
            }
        }
    }

    /**
     * Zooms in on the range axes.
     *
     * @param lowerPercent  the lower bound.
     * @param upperPercent  the upper bound.
     * @param info  the plot rendering info (<code>null not permitted).
     * @param source  the source point (<code>null not permitted).
     */
    public void zoomRangeAxes(double lowerPercent, double upperPercent,
                              PlotRenderingInfo info, Point2D source) {
        // delegate 'info' and 'source' argument checks...
        XYPlot subplot = findSubplot(info, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
        }
        else {
            // if the source point doesn't fall within a subplot, we do the
            // zoom on all subplots...
            Iterator iterator = getSubplots().iterator();
            while (iterator.hasNext()) {
                subplot = (XYPlot) iterator.next();
                subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
            }
        }
    }

    /**
     * Returns the subplot (if any) that contains the (x, y) point (specified
     * in Java2D space).
     *
     * @param info  the chart rendering info (<code>null not permitted).
     * @param source  the source point (<code>null not permitted).
     *
     * @return A subplot (possibly <code>null).
     */
    public XYPlot findSubplot(PlotRenderingInfo info, Point2D source) {
        if (info == null) {
            throw new IllegalArgumentException("Null 'info' argument.");
        }
        if (source == null) {
            throw new IllegalArgumentException("Null 'source' argument.");
        }
        XYPlot result = null;
        int subplotIndex = info.getSubplotIndex(source);
        if (subplotIndex >= 0) {
            result =  (XYPlot) this.subplots.get(subplotIndex);
        }
        return result;
    }

    /**
     * Sets the item renderer FOR ALL SUBPLOTS.  Registered listeners are
     * notified that the plot has been modified.
     * <P>
     * Note: usually you will want to set the renderer independently for each
     * subplot, which is NOT what this method does.
     *
     * @param renderer the new renderer.
     */
    public void setRenderer(XYItemRenderer renderer) {

        super.setRenderer(renderer);  // not strictly necessary, since the
                                      // renderer set for the
                                      // parent plot is not used

        Iterator iterator = this.subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setRenderer(renderer);
        }

    }

    /**
     * Sets the fixed range axis space and sends a {@link PlotChangeEvent} to
     * all registered listeners.
     *
     * @param space  the space (<code>null permitted).
     */
    public void setFixedRangeAxisSpace(AxisSpace space) {
        super.setFixedRangeAxisSpace(space);
        setFixedRangeAxisSpaceForSubplots(space);
        fireChangeEvent();
    }

    /**
     * Sets the size (width or height, depending on the orientation of the
     * plot) for the domain axis of each subplot.
     *
     * @param space  the space.
     */
    protected void setFixedRangeAxisSpaceForSubplots(AxisSpace space) {
        Iterator iterator = this.subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setFixedRangeAxisSpace(space, false);
        }
    }

    /**
     * Handles a 'click' on the plot by updating the anchor values.
     *
     * @param x  x-coordinate, where the click occured.
     * @param y  y-coordinate, where the click occured.
     * @param info  object containing information about the plot dimensions.
     */
    public void handleClick(int x, int y, PlotRenderingInfo info) {
        Rectangle2D dataArea = info.getDataArea();
        if (dataArea.contains(x, y)) {
            for (int i = 0; i < this.subplots.size(); i++) {
                XYPlot subplot = (XYPlot) this.subplots.get(i);
                PlotRenderingInfo subplotInfo = info.getSubplotInfo(i);
                subplot.handleClick(x, y, subplotInfo);
            }
        }
    }

    /**
     * Receives a {@link PlotChangeEvent} and responds by notifying all
     * listeners.
     *
     * @param event  the event.
     */
    public void plotChanged(PlotChangeEvent event) {
        notifyListeners(event);
    }

    /**
     * Tests this plot for equality with another object.
     *
     * @param obj  the other object.
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof CombinedDomainXYPlot)) {
            return false;
        }
        CombinedDomainXYPlot that = (CombinedDomainXYPlot) obj;
        if (this.gap != that.gap) {
            return false;
        }
        if (!ObjectUtilities.equal(this.subplots, that.subplots)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a clone of the annotation.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  this class will not throw this
     *         exception, but subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {

        CombinedDomainXYPlot result = (CombinedDomainXYPlot) super.clone();
        result.subplots = (List) ObjectUtilities.deepClone(this.subplots);
        for (Iterator it = result.subplots.iterator(); it.hasNext();) {
            Plot child = (Plot) it.next();
            child.setParent(result);
        }

        // after setting up all the subplots, the shared domain axis may need
        // reconfiguring
        ValueAxis domainAxis = result.getDomainAxis();
        if (domainAxis != null) {
            domainAxis.configure();
        }

        return result;

    }

}

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