stackedbarrenderer.java

提供JFreechart图表功能, 提供JFreechart图表功能,提供JFreechart图表功能

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, 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.]
 *
 * -----------------------
 * StackedBarRenderer.java
 * -----------------------
 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Richard Atkinson;
 *                   Thierry Saura;
 *                   Christian W. Zuckschwerdt;
 *
 * Changes
 * -------
 * 19-Oct-2001 : Version 1 (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 23-Oct-2001 : Changed intro and trail gaps on bar plots to use percentage of 
 *               available space rather than a fixed number of units (DG);
 * 15-Nov-2001 : Modified to allow for null data values (DG);
 * 22-Nov-2001 : Modified to allow for negative data values (DG);
 * 13-Dec-2001 : Added tooltips (DG);
 * 16-Jan-2002 : Fixed bug for single category datasets (DG);
 * 15-Feb-2002 : Added isStacked() method (DG);
 * 14-Mar-2002 : Modified to implement the CategoryItemRenderer interface (DG);
 * 24-May-2002 : Incorporated tooltips into chart entities (DG);
 * 11-Jun-2002 : Added check for (permitted) null info object, bug and fix 
 *               reported by David Basten.  Also updated Javadocs. (DG);
 * 25-Jun-2002 : Removed redundant import (DG);
 * 26-Jun-2002 : Small change to entity (DG);
 * 05-Aug-2002 : Small modification to drawCategoryItem method to support URLs 
 *               for HTML image maps (RA);
 * 08-Aug-2002 : Added optional linking lines, contributed by Thierry 
 *               Saura (DG);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and 
 *               CategoryToolTipGenerator interface (DG);
 * 05-Nov-2002 : Replaced references to CategoryDataset with TableDataset (DG);
 * 26-Nov-2002 : Replaced isStacked() method with getRangeType() method (DG);
 * 17-Jan-2003 : Moved plot classes to a separate package (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 12-May-2003 : Merged horizontal and vertical stacked bar renderers (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 08-Sep-2003 : Fixed bug 799668 (isBarOutlineDrawn() ignored) (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 21-Oct-2003 : Moved bar width into renderer state (DG);
 * 26-Nov-2003 : Added code to respect maxBarWidth attribute (DG);
 * 05-Nov-2004 : Changed to a two-pass renderer so that item labels are not 
 *               overwritten by other bars (DG);
 * 07-Jan-2005 : Renamed getRangeExtent() --> findRangeBounds() (DG);
 * 29-Mar-2005 : Modified drawItem() method so that a zero value is handled 
 *               within the code for positive rather than negative values (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * 17-May-2005 : Added flag to allow rendering values as percentages - inspired
 *               by patch 1200886 submitted by John Xiao (DG);
 * 09-Jun-2005 : Added accessor methods for the renderAsPercentages flag,
 *               provided equals() method, and use addItemEntity from 
 *               superclass (DG);
 * 09-Jun-2005 : Added support for GradientPaint - see bug report 1215670 (DG);
 * 22-Sep-2005 : Renamed getMaxBarWidth() --> getMaximumBarWidth() (DG);
 * 29-Sep-2005 : Use outline stroke in drawItem method - see bug report 
 *               1304139 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 11-Oct-2006 : Source reformatting (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.DataUtilities;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.TextAnchor;
import org.jfree.util.PublicCloneable;

/**
 * A stacked bar renderer for use with the 
 * {@link org.jfree.chart.plot.CategoryPlot} class.
 */
public class StackedBarRenderer extends BarRenderer 
                                implements Cloneable, PublicCloneable, 
                                           Serializable {

    /** For serialization. */
    static final long serialVersionUID = 6402943811500067531L;
    
    /** A flag that controls whether the bars display values or percentages. */
    private boolean renderAsPercentages;
    
    /**
     * Creates a new renderer.  By default, the renderer has no tool tip 
     * generator and no URL generator.  These defaults have been chosen to 
     * minimise the processing required to generate a default chart.  If you 
     * require tool tips or URLs, then you can easily add the required 
     * generators.
     */
    public StackedBarRenderer() {
        this(false);
    }
    
    /**
     * Creates a new renderer.
     * 
     * @param renderAsPercentages  a flag that controls whether the data values
     *                             are rendered as percentages.
     */
    public StackedBarRenderer(boolean renderAsPercentages) {
        super();
        this.renderAsPercentages = renderAsPercentages;
        
        // set the default item label positions, which will only be used if 
        // the user requests visible item labels...
        ItemLabelPosition p = new ItemLabelPosition(ItemLabelAnchor.CENTER, 
                TextAnchor.CENTER);
        setBasePositiveItemLabelPosition(p);
        setBaseNegativeItemLabelPosition(p);
        setPositiveItemLabelPositionFallback(null);
        setNegativeItemLabelPositionFallback(null);
    }

    /**
     * Returns <code>true</code> if the renderer displays each item value as
     * a percentage (so that the stacked bars add to 100%), and 
     * <code>false</code> otherwise.
     * 
     * @return A boolean.
     * 
     * @see #setRenderAsPercentages(boolean)
     */
    public boolean getRenderAsPercentages() {
        return this.renderAsPercentages;   
    }
    
    /**
     * Sets the flag that controls whether the renderer displays each item
     * value as a percentage (so that the stacked bars add to 100%), and sends
     * a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param asPercentages  the flag.
     * 
     * @see #getRenderAsPercentages()
     */
    public void setRenderAsPercentages(boolean asPercentages) {
        this.renderAsPercentages = asPercentages; 
        fireChangeEvent();
    }
    
    /**
     * Returns the number of passes (<code>2</code>) required by this renderer. 
     * The first pass is used to draw the bars, the second pass is used to
     * draw the item labels (if visible).
     * 
     * @return The number of passes required by the renderer.
     */
    public int getPassCount() {
        return 2;
    }
    
    /**
     * Returns the range of values the renderer requires to display all the
     * items from the specified dataset.