barrenderer.java

jfreechart-1.0.12.zip 可以用来作图

/* ===========================================================
 * 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.]
 *
 * ----------------
 * BarRenderer.java
 * ----------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Christian W. Zuckschwerdt;
 *
 * 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);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 26-Jan-2005 : Provided override for getLegendItem() method (DG);
 * 20-Apr-2005 : Generate legend labels, tooltips and URLs (DG);
 * 18-May-2005 : Added configurable base value (DG);
 * 09-Jun-2005 : Use addItemEntity() method from superclass (DG);
 * 01-Dec-2005 : Update legend item to use/not use outline (DG);
 * ------------: JFreeChart 1.0.x ---------------------------------------------
 * 06-Dec-2005 : Fixed bug 1374222 (JDK 1.4 specific code) (DG);
 * 11-Jan-2006 : Fixed bug 1401856 (bad rendering for non-zero base) (DG);
 * 04-Aug-2006 : Fixed bug 1467706 (missing item labels for zero value
 *               bars) (DG);
 * 04-Dec-2006 : Fixed bug in rendering to non-primary axis (DG);
 * 13-Dec-2006 : Add support for GradientPaint display in legend items (DG);
 * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
 * 11-May-2007 : Check for visibility in getLegendItem() (DG);
 * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
 * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
 * 07-May-2008 : If minimumBarLength is > 0.0, extend the non-base end of the
 *               bar (DG);
 * 17-Jun-2008 : Apply legend shape, font and paint attributes (DG);
 * 24-Jun-2008 : Added barPainter mechanism (DG);
 * 26-Jun-2008 : Added crosshair support (DG);
 * 13-Aug-2008 : Added shadowPaint attribute (DG);
 *
 */

package org.jfree.chart.renderer.category;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
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.LegendItem;
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.chart.plot.PlotRenderingInfo;
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.text.TextUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A {@link CategoryItemRenderer} that draws individual data items as bars.
 * The example shown here is generated by the <code>BarChartDemo1.java</code>
 * program included in the JFreeChart Demo Collection:
 * <br><br>
 * <img src="../../../../../images/BarRendererSample.png"
 * alt="BarRendererSample.png" />
 */
public class BarRenderer extends AbstractCategoryItemRenderer
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 6000649414965887481L;

    /** 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 default bar painter assigned to each new instance of this renderer.
     *
     * @since 1.0.11
     */
    private static BarPainter defaultBarPainter = new GradientBarPainter();

    /**
     * Returns the default bar painter.
     *
     * @return The default bar painter.
     *
     * @since 1.0.11
     */
    public static BarPainter getDefaultBarPainter() {
        return BarRenderer.defaultBarPainter;
    }

    /**
     * Sets the default bar painter.
     *
     * @param painter  the painter (<code>null</code> not permitted).
     *
     * @since 1.0.11
     */
    public static void setDefaultBarPainter(BarPainter painter) {
        if (painter == null) {
            throw new IllegalArgumentException("Null 'painter' argument.");
        }
        BarRenderer.defaultBarPainter = painter;
    }

    /** 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 maximumBarWidth;

    /** 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

    /** The base value for the bars (defaults to 0.0). */
    private double base;

    /**
     * A flag that controls whether the base value is included in the range
     * returned by the findRangeBounds() method.
     */
    private boolean includeBaseInRange;

    /**
     * The bar painter (never <code>null</code>).
     *
     * @since 1.0.11
     */
    private BarPainter barPainter;

    /**
     * The flag that controls whether or not shadows are drawn for the bars.
     *
     * @since 1.0.11
     */
    private boolean shadowsVisible;

    /**
     * The shadow paint.
     *
     * @since 1.0.11
     */
    private transient Paint shadowPaint;

    /**
     * The x-offset for the shadow effect.
     *
     * @since 1.0.11
     */
    private double shadowXOffset;

    /**
     * The y-offset for the shadow effect.
     *
     * @since 1.0.11
     */
    private double shadowYOffset;

    /**
     * Creates a new bar renderer with default settings.
     */
    public BarRenderer() {
        super();
        this.base = 0.0;
        this.includeBaseInRange = true;
        this.itemMargin = DEFAULT_ITEM_MARGIN;
        this.drawBarOutline = false;
        this.maximumBarWidth = 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;
        setBaseLegendShape(new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0));
        this.barPainter = getDefaultBarPainter();
        this.shadowsVisible = true;
        this.shadowPaint = Color.gray;
        this.shadowXOffset = 4.0;
        this.shadowYOffset = 4.0;
    }

    /**
     * Returns the base value for the bars.  The default value is
     * <code>0.0</code>.
     *
     * @return The base value for the bars.
     *
     * @see #setBase(double)
     */
    public double getBase() {
        return this.base;
    }

    /**
     * Sets the base value for the bars and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param base  the new base value.
     *
     * @see #getBase()
     */
    public void setBase(double base) {
        this.base = base;
        fireChangeEvent();
    }

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