waterfallbarrenderer.java

java图形利器

/* ===========================================================
 * 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.]
 *
 * -------------------------
 * WaterfallBarRenderer.java
 * -------------------------
 * (C) Copyright 2003-2007, by Object Refinery Limited and Contributors.
 *
 * Original Author:  Darshan Shah;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: WaterfallBarRenderer.java,v 1.9.2.3 2007/06/08 13:57:38 mungady Exp $
 *
 * Changes
 * -------
 * 20-Oct-2003 : Version 1, contributed by Darshan Shah (DG);
 * 06-Nov-2003 : Changed order of parameters in constructor, and added support 
 *               for GradientPaint (DG);
 * 10-Feb-2004 : Updated drawItem() method to make cut-and-paste overriding 
 *               easier.  Also fixed a bug that meant the minimum bar length 
 *               was being ignored (DG);
 * 04-Oct-2004 : Reworked equals() method and renamed PaintUtils 
 *               --> PaintUtilities (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 07-Jan-2005 : Renamed getRangeExtent() --> findRangeBounds (DG);
 * 23-Feb-2005 : Added argument checking (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * 09-Jun-2005 : Use addItemEntity() from superclass (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
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.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.AbstractRenderer;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.GradientPaintTransformType;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A renderer that handles the drawing of waterfall bar charts, for use with 
 * the {@link CategoryPlot} class.  Note that the bar colors are defined 
 * using special methods in this class - the inherited methods (for example,
 * {@link AbstractRenderer#setSeriesPaint(int, Paint)}) are ignored.
 */
public class WaterfallBarRenderer extends BarRenderer 
                                  implements Cloneable, PublicCloneable, 
                                             Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -2482910643727230911L;
    
    /** The paint used to draw the first bar. */
    private transient Paint firstBarPaint;

    /** The paint used to draw the last bar. */
    private transient Paint lastBarPaint;

    /** The paint used to draw bars having positive values. */
    private transient Paint positiveBarPaint;

    /** The paint used to draw bars having negative values. */
    private transient Paint negativeBarPaint;

    /**
     * Constructs a new renderer with default values for the bar colors.
     */
    public WaterfallBarRenderer() {
        this(new GradientPaint(0.0f, 0.0f, new Color(0x22, 0x22, 0xFF), 
                0.0f, 0.0f, new Color(0x66, 0x66, 0xFF)), 
                new GradientPaint(0.0f, 0.0f, new Color(0x22, 0xFF, 0x22), 
                0.0f, 0.0f, new Color(0x66, 0xFF, 0x66)), 
                new GradientPaint(0.0f, 0.0f, new Color(0xFF, 0x22, 0x22), 
                0.0f, 0.0f, new Color(0xFF, 0x66, 0x66)),
                new GradientPaint(0.0f, 0.0f, new Color(0xFF, 0xFF, 0x22), 
                0.0f, 0.0f, new Color(0xFF, 0xFF, 0x66)));
    }

    /**
     * Constructs a new waterfall renderer.
     *
     * @param firstBarPaint  the color of the first bar (<code>null</code> not 
     *                       permitted).
     * @param positiveBarPaint  the color for bars with positive values 
     *                          (<code>null</code> not permitted).
     * @param negativeBarPaint  the color for bars with negative values 
     *                          (<code>null</code> not permitted).
     * @param lastBarPaint  the color of the last bar (<code>null</code> not 
     *                      permitted).
     */
    public WaterfallBarRenderer(Paint firstBarPaint, 
                                Paint positiveBarPaint, 
                                Paint negativeBarPaint,
                                Paint lastBarPaint) {
        super();
        if (firstBarPaint == null) {
            throw new IllegalArgumentException("Null 'firstBarPaint' argument");
        }
        if (positiveBarPaint == null) {
            throw new IllegalArgumentException(
                    "Null 'positiveBarPaint' argument");   
        }
        if (negativeBarPaint == null) {
            throw new IllegalArgumentException(
                    "Null 'negativeBarPaint' argument");   
        }
        if (lastBarPaint == null) {
            throw new IllegalArgumentException("Null 'lastBarPaint' argument");
        }
        this.firstBarPaint = firstBarPaint;
        this.lastBarPaint = lastBarPaint;
        this.positiveBarPaint = positiveBarPaint;
        this.negativeBarPaint = negativeBarPaint;
        setGradientPaintTransformer(new StandardGradientPaintTransformer(
                GradientPaintTransformType.CENTER_VERTICAL));
        setMinimumBarLength(1.0);
    }

    /**
     * Returns the range of values the renderer requires to display all the 
     * items from the specified dataset.
     * 
     * @param dataset  the dataset (<code>null</code> not permitted).
     * 
     * @return The range (or <code>null</code> if the dataset is empty).
     */
    public Range findRangeBounds(CategoryDataset dataset) {
        return DatasetUtilities.findCumulativeRangeBounds(dataset);   
    }

    /**
     * Returns the paint used to draw the first bar.
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getFirstBarPaint() {
        return this.firstBarPaint;
    }
    
    /**
     * Sets the paint that will be used to draw the first bar and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setFirstBarPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument");   
        }
        this.firstBarPaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the paint used to draw the last bar.
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getLastBarPaint() {
        return this.lastBarPaint;
    }
    
    /**
     * Sets the paint that will be used to draw the last bar.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setLastBarPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument");   
        }
        this.lastBarPaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the paint used to draw bars with positive values.
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getPositiveBarPaint() {
        return this.positiveBarPaint;
    }
    
    /**
     * Sets the paint that will be used to draw bars having positive values.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setPositiveBarPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument");   
        }
        this.positiveBarPaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the paint used to draw bars with negative values.
     * 
     * @return The paint (never <code>null</code>).