intervalbarrenderer.java

JFreeChartweb图表

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ------------------------
 * IntervalBarRenderer.java
 * ------------------------
 * (C) Copyright 2002, 2003 by Jeremy Bowman.
 *
 * Original Author:  Jeremy Bowman;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Christian W. Zuckschwerdt;
 *
 * $Id: IntervalBarRenderer.java,v 1.11 2003/09/08 09:54:43 mungady Exp $
 *
 * Changes
 * -------
 * 29-Apr-2002 : Version 1, contributed by Jeremy Bowman (DG);
 * 11-May-2002 : Use CategoryPlot.getLabelsVisible() (JB);
 * 29-May-2002 : Added constructors (DG);
 * 26-Jun-2002 : Added axis to initialise method (DG);
 * 20-Sep-2002 : Added basic support for chart entities (DG);
 * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and CategoryToolTipGenerator
 *               interface (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 19-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 08-Sep-2003 : Added checks for null values (DG);
 * 
 */

package org.jfree.chart.renderer;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
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.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.CategoryDataset;
import org.jfree.data.IntervalCategoryDataset;
import org.jfree.data.MultiIntervalCategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;


/**
 * A renderer that handles the drawing of bars for a bar plot where
 * each bar has a high and low value.
 * <p>
 * For use with the {@link CategoryPlot} class.
 *
 * @author Jeremy Bowman
 */
public class IntervalBarRenderer extends BarRenderer
        implements CategoryItemRenderer, Cloneable, PublicCloneable, Serializable {

    /**
     * Constructs a new renderer.
     */
    public IntervalBarRenderer() {
        super();
    }

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    public void drawItem(Graphics2D g2,
                         Rectangle2D dataArea,
                         CategoryPlot plot,
                         CategoryAxis domainAxis,
                         ValueAxis rangeAxis,
                         CategoryDataset dataset,
                         int row,
                         int column) {

         if (dataset instanceof MultiIntervalCategoryDataset) {
             MultiIntervalCategoryDataset d = (MultiIntervalCategoryDataset) dataset;
             drawSubIntervals(g2, dataArea, plot, domainAxis, rangeAxis, d, row, column);
         }
         else if (dataset instanceof IntervalCategoryDataset) {
             IntervalCategoryDataset d = (IntervalCategoryDataset) dataset;
             drawInterval(g2, dataArea, plot, domainAxis, rangeAxis, d, row, column);
         }
         else {
             // how do we want to handle a standard CategoryDataset
         } 
     }
                          
     /**
      * Draws a single interval.
      *
      * @param g2  the graphics device.
      * @param dataArea  the data plot area.
      * @param plot  the plot.
      * @param domainAxis  the domain axis.
      * @param rangeAxis  the range axis.
      * @param dataset  the data.
      * @param row  the row index (zero-based).
      * @param column  the column index (zero-based).
      */
     private void drawInterval(Graphics2D g2,
                               Rectangle2D dataArea,
                               CategoryPlot plot,
                               CategoryAxis domainAxis,
                               ValueAxis rangeAxis,
                               IntervalCategoryDataset dataset,
                               int row,
                               int column) {

        int seriesCount = getRowCount();
        int categoryCount = getColumnCount();

        PlotOrientation orientation = plot.getOrientation();
        
        double rectX = 0.0;
        double rectY = 0.0;

        RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
        
        // Y0
        Number value0 = dataset.getEndValue(row, column);
        if (value0 == null) {
            return;
        }
        double java2dValue0 = rangeAxis.translateValueToJava2D(value0.doubleValue(), dataArea, 
                                                               rangeAxisLocation);

        // Y1
        Number value1 = dataset.getStartValue(row, column);
        if (value1 == null) {
            return;
        }
        double java2dValue1 = rangeAxis.translateValueToJava2D(value1.doubleValue(), dataArea, 
                                                               rangeAxisLocation);

        if (java2dValue1 < java2dValue0) {
            double temp = java2dValue1;
            java2dValue1 = java2dValue0;
            java2dValue0 = temp;
            Number tempNum = value1;
            value1 = value0;
            value0 = tempNum;
        }

        // BAR WIDTH
        double rectWidth = getBarWidth();

        // BAR HEIGHT
        double rectHeight = Math.abs(java2dValue1 - java2dValue0);

        if (orientation == PlotOrientation.HORIZONTAL) {
            // BAR Y
            rectY = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, 
                                                domainAxisLocation);
            if (seriesCount > 1) {
                double seriesGap = dataArea.getHeight() * getItemMargin()
                                   / (categoryCount * (seriesCount - 1));