levelrenderer.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.]
 *
 * ------------------
 * LevelRenderer.java
 * ------------------
 * (C) Copyright 2004-2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: LevelRenderer.java,v 1.7.2.4 2007/06/01 15:12:15 mungady Exp $
 *
 * Changes
 * -------
 * 09-Jan-2004 : Version 1 (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * ------------- JFREECHART 1.0.0 ---------------------------------------------
 * 23-Jan-2006 : Renamed getMaxItemWidth() --> getMaximumItemWidth() (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Line2D;
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.CategoryItemLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
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.RectangleEdge;
import org.jfree.util.PublicCloneable;

/**
 * A {@link CategoryItemRenderer} that draws individual data items as 
 * horizontal lines, spaced in the same way as bars in a bar chart.
 */
public class LevelRenderer extends AbstractCategoryItemRenderer 
                           implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -8204856624355025117L;
    
    /** The default item margin percentage. */
    public static final double DEFAULT_ITEM_MARGIN = 0.20;

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

    /** The maximum item width as a percentage of the available space. */
    private double maxItemWidth;
    
    /**
     * Creates a new renderer with default settings.
     */
    public LevelRenderer() {
        super();
        this.itemMargin = DEFAULT_ITEM_MARGIN;
        this.maxItemWidth = 1.0;  // 100 percent, so it will not apply unless 
                                  // changed
    }

    /**
     * Returns the item margin.
     *
     * @return The margin.
     */
    public double getItemMargin() {
        return this.itemMargin;
    }

    /**
     * Sets the item margin.  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 new margin.
     */
    public void setItemMargin(double percent) {
        this.itemMargin = percent;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the maximum width, as a percentage of the available drawing 
     * space.
     * 
     * @return The maximum width.
     * 
     * @deprecated Use {@link #getMaximumItemWidth()} instead.
     */
    public double getMaxItemWidth() {
        return this.maxItemWidth;
    }
    
    /**
     * Sets the maximum item width, which is specified as a percentage of the 
     * available space for all items, and sends a {@link RendererChangeEvent} 
     * to all registered listeners.
     * 
     * @param percent  the percent.
     * 
     * @deprecated Use {@link #setMaximumItemWidth(double)} instead.
     */
    public void setMaxItemWidth(double percent) {
        this.maxItemWidth = percent;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the maximum width, as a percentage of the available drawing 
     * space.
     * 
     * @return The maximum width.
     */
    public double getMaximumItemWidth() {
        return getMaxItemWidth();
    }
    
    /**
     * Sets the maximum item width, which is specified as a percentage of the 
     * available space for all items, and sends a {@link RendererChangeEvent} 
     * to all registered listeners.
     * 
     * @param percent  the percent.
     */
    public void setMaximumItemWidth(double percent) {
        setMaxItemWidth(percent);
    }

    /**
     * Initialises the renderer and returns a state object that will be passed 
     * to subsequent calls to the drawItem method.
     * <p>
     * This method gets called once at the start of the process of drawing a 
     * chart.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the data is to be plotted.
     * @param plot  the plot.
     * @param rendererIndex  the renderer index.
     * @param info  collects chart rendering information for return to caller.
     * 
     * @return The renderer state.
     *
     */
    public CategoryItemRendererState initialise(Graphics2D g2,
                                                Rectangle2D dataArea,
                                                CategoryPlot plot,
                                                int rendererIndex,
                                                PlotRenderingInfo info) {

        CategoryItemRendererState state = super.initialise(g2, dataArea, plot, 
                rendererIndex, info);
        calculateItemWidth(plot, dataArea, rendererIndex, state);
        return state;
        
    }
    
    /**
     * Calculates the bar width and stores it in the renderer state.
     * 
     * @param plot  the plot.
     * @param dataArea  the data area.
     * @param rendererIndex  the renderer index.
     * @param state  the renderer state.
     */
    protected void calculateItemWidth(CategoryPlot plot, 
                                      Rectangle2D dataArea, 
                                      int rendererIndex,
                                      CategoryItemRendererState state) {
                                         
        CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
        CategoryDataset dataset = plot.getDataset(rendererIndex);
        if (dataset != null) {
            int columns = dataset.getColumnCount();
            int rows = dataset.getRowCount();
            double space = 0.0;