barrenderer.java

jfreechart安装程序和使用说明

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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.]
 *
 * ----------------
 * BarRenderer.java
 * ----------------
 * (C) Copyright 2002-2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Christian W. Zuckschwerdt;
 *
 * $Id: BarRenderer.java,v 1.1 2004/08/31 14:47:48 mungady Exp $
 *
 * Changes
 * -------
 * 14-Mar-2002 : Version 1 (DG);
 * 23-May-2002 : Added tooltip generator to renderer (DG);
 * 29-May-2002 : Moved tooltip generator to abstract super-class (DG);
 * 25-Jun-2002 : Changed constructor to protected and removed redundant code (DG);
 * 26-Jun-2002 : Added axis to initialise method, and record upper and lower clip values (DG);
 * 24-Sep-2002 : Added getLegendItem(...) method (DG);
 * 09-Oct-2002 : Modified constructor to include URL generator (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 10-Jan-2003 : Moved get/setItemMargin() method up from subclasses (DG);
 * 17-Jan-2003 : Moved plot classes into a separate package (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified clipping to allow for dual axes and datasets (DG);
 * 12-May-2003 : Merged horizontal and vertical bar renderers (DG);
 * 12-Jun-2003 : Updates for item labels (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 02-Sep-2003 : Changed initialise method to fix bug 790407 (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 07-Oct-2003 : Added renderer state (DG);
 * 27-Oct-2003 : Merged drawHorizontalItem(...) and drawVerticalItem(...) methods (DG);
 * 28-Oct-2003 : Added support for gradient paint on bars (DG);
 * 14-Nov-2003 : Added 'maxBarWidth' attribute (DG);
 * 10-Feb-2004 : Small changes inside drawItem() method to ease cut-and-paste overriding (DG);
 * 19-Mar-2004 : Fixed bug introduced with separation of tool tip and item label generators.
 *               Fixed equals() method (DG);
 * 11-May-2004 : Fix for null pointer exception (bug id 951127) (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Point2D;
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.CategoryItemEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
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.chart.plot.PlotRenderingInfo;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.ObjectUtils;
import org.jfree.util.PublicCloneable;

/**
 * A {@link CategoryItemRenderer} that draws individual data items as bars.
 */
public class BarRenderer extends AbstractCategoryItemRenderer 
                         implements Cloneable, PublicCloneable, Serializable {

    /** The default item margin percentage. */
    public static final double DEFAULT_ITEM_MARGIN = 0.20;

    /** Constant that controls the minimum width before a bar has an outline drawn. */
    public static final double BAR_OUTLINE_WIDTH_THRESHOLD = 3.0;

    /** The margin between items (bars) within a category. */
    private double itemMargin;

    /** A flag that controls whether or not bar outlines are drawn. */
    private boolean drawBarOutline;
    
    /** The maximum bar width as a percentage of the available space. */
    private double maxBarWidth;
    
    /** The minimum bar length (in Java2D units). */
    private double minimumBarLength;
    
    /** An optional class used to transform gradient paint objects to fit each bar. */
    private GradientPaintTransformer gradientPaintTransformer;
    
    /** The fallback position if a positive item label doesn't fit inside the bar. */
    private ItemLabelPosition positiveItemLabelPositionFallback;
    
    /** The fallback position if a negative item label doesn't fit inside the bar. */
    private ItemLabelPosition negativeItemLabelPositionFallback;
    
    /** The upper clip (axis) value for the axis. */
    private double upperClip;  // TODO:  this needs to move into the renderer state

    /** The lower clip (axis) value for the axis. */
    private double lowerClip;  // TODO:  this needs to move into the renderer state

    /**
     * Creates a new bar renderer with default settings.
     */
    public BarRenderer() {
        super();
        this.itemMargin = DEFAULT_ITEM_MARGIN;
        this.drawBarOutline = true;
        this.maxBarWidth = 1.0;  // 100 percent, so it will not apply unless changed
        this.positiveItemLabelPositionFallback = null;
        this.negativeItemLabelPositionFallback = null;
        this.gradientPaintTransformer = new StandardGradientPaintTransformer();
        this.minimumBarLength = 0.0;
    }

    /**
     * Returns the item margin as a percentage of the available space for all bars.
     *
     * @return The margin percentage (where 0.10 is ten percent).
     */
    public double getItemMargin() {
        return this.itemMargin;
    }

    /**
     * Sets the item margin and sends a {@link RendererChangeEvent} to all registered listeners.  
     * The value is expressed as a percentage of the available width for plotting all the bars, 
     * with the resulting amount to be distributed between all the bars evenly.
     *
     * @param percent  the margin (where 0.10 is ten percent).
     */
    public void setItemMargin(double percent) {
        this.itemMargin = percent;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns a flag that controls whether or not bar outlines are drawn.
     * 
     * @return A boolean.
     */
    public boolean isDrawBarOutline() {
        return this.drawBarOutline;    
    }
    
    /**
     * Sets the flag that controls whether or not bar outlines are drawn and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param draw  the flag.
     */
    public void setDrawBarOutline(boolean draw) {
        this.drawBarOutline = draw;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the maximum bar width, as a percentage of the available drawing space.
     * 
     * @return The maximum bar width.
     */
    public double getMaxBarWidth() {
        return this.maxBarWidth;
    }
    
    /**
     * Sets the maximum bar width, which is specified as a percentage of the available space
     * for all bars, and sends a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param percent  the percent (where 0.05 is five percent).
     */
    public void setMaxBarWidth(double percent) {
        this.maxBarWidth = percent;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the minimum bar length (in Java2D units).
     * 
     * @return The minimum bar length.
     */
    public double getMinimumBarLength() {
        return this.minimumBarLength;
    }
    
    /**
     * Sets the minimum bar length and sends a {@link RendererChangeEvent} to all registered
     * listeners.  The minimum bar length is specified in Java2D units, and can be used to prevent 
     * bars that represent very small data values from disappearing when drawn on the screen.
     * 
     * @param min  the minimum bar length (in Java2D units).
     */
    public void setMinimumBarLength(double min) {
        this.minimumBarLength = min;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the gradient paint transformer (an object used to transform gradient paint objects
     * to fit each bar.
     * 
     * @return A transformer (<code>null</code> possible).
     */    
    public GradientPaintTransformer getGradientPaintTransformer() {
        return this.gradientPaintTransformer;    
    }
    
    /**
     * Sets the gradient paint transformer and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     * 
     * @param transformer  the transformer (<code>null</code> permitted).
     */
    public void setGradientPaintTransformer(GradientPaintTransformer transformer) {
        this.gradientPaintTransformer = transformer;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the fallback position for positive item labels that don't fit within a bar.
     * 
     * @return The fallback position (<code>null</code> possible).
     */
    public ItemLabelPosition getPositiveItemLabelPositionFallback() {
        return this.positiveItemLabelPositionFallback;
    }
    
    /**
     * Sets the fallback position for positive item labels that don't fit within a bar, and sends
     * a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position (<code>null</code> permitted).
     */
    public void setPositiveItemLabelPositionFallback(ItemLabelPosition position) {
        this.positiveItemLabelPositionFallback = position;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the fallback position for negative item labels that don't fit within a bar.
     * 
     * @return The fallback position (<code>null</code> possible).
     */
    public ItemLabelPosition getNegativeItemLabelPositionFallback() {
        return this.negativeItemLabelPositionFallback;
    }
    
    /**
     * Sets the fallback position for negative item labels that don't fit within a bar, and sends
     * a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position (<code>null</code> permitted).
     */
    public void setNegativeItemLabelPositionFallback(ItemLabelPosition position) {