Java/Chart/Area Chart

JFreeChart: Area Chart Demo

   <source lang="java">

/* ===========================================================

* 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.]
*
* ------------------
* AreaChartDemo.java
* ------------------
* (C) Copyright 2002-2004, by Object Refinery Limited and Contributors.
*
* Original Author:  David Gilbert (for Object Refinery Limited);
* Contributor(s):   -;
*
* $Id: AreaChartDemo.java,v 1.34 2004/05/26 13:04:14 mungady Exp $
*
* Changes
* -------
* 11-Jun-2002 : Version 1 (DG);
* 25-Jun-2002 : Removed unnecessary imports (DG);
* 10-Oct-2002 : Renamed AreaChartForCategoryDataDemo --> AreaChartDemo (DG);
* 05-Nov-2003 : Added category label position (DG);
*
*/

package org.jfree.chart.demo; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.CategoryAxis; import org.jfree.chart.axis.CategoryLabelPositions; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.title.TextTitle; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RectangleEdge; import org.jfree.ui.RefineryUtilities; import org.jfree.ui.Spacer; import org.jfree.ui.VerticalAlignment; import org.jfree.util.Log; import org.jfree.util.PrintStreamLogTarget; /**

* A simple demonstration application showing how to create an area chart using data from a
* {@link CategoryDataset}.
*/

public class AreaChartDemo extends ApplicationFrame {

   /**
    * Creates a new demo application.
    *
    * @param title  the frame title.
    */
   public AreaChartDemo(final String title) {
       super(title);
       // create a dataset...
       final double[][] data = new double[][] {
           {1.0, 4.0, 3.0, 5.0, 5.0, 7.0, 7.0, 8.0},
           {5.0, 7.0, 6.0, 8.0, 4.0, 4.0, 2.0, 1.0},
           {4.0, 3.0, 2.0, 3.0, 6.0, 3.0, 4.0, 3.0}
       };
       final CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
           "Series ", "Type ", data
       );
       // create the chart...
       final JFreeChart chart = createChart(dataset);
       final ChartPanel chartPanel = new ChartPanel(chart);
       chartPanel.setPreferredSize(new Dimension(500, 270));
       chartPanel.setEnforceFileExtensions(false);
       
       setContentPane(chartPanel);
   }
   // ****************************************************************************
   // * JFREECHART DEVELOPER GUIDE                                               *
   // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
   // * to purchase from Object Refinery Limited:                                *
   // *                                                                          *
   // * http://www.object-refinery.ru/jfreechart/guide.html                     *
   // *                                                                          *
   // * Sales are used to provide funding for the JFreeChart project - please    * 
   // * support us so that we can continue developing free software.             *
   // ****************************************************************************
   
   /**
    * Creates a chart.
    * 
    * @param dataset  the dataset.
    * 
    * @return The chart.
    */
   private JFreeChart createChart(final CategoryDataset dataset) {
               
       final JFreeChart chart = ChartFactory.createAreaChart(
           "Area Chart",             // chart title
           "Category",               // domain axis label
           "Value",                  // range axis label
           dataset,                  // data
           PlotOrientation.VERTICAL, // orientation
           true,                     // include legend
           true,                     // tooltips
           false                     // urls
       );

       // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...
       // set the background color for the chart...

// final StandardLegend legend = (StandardLegend) chart.getLegend();

 //      legend.setAnchor(StandardLegend.SOUTH);
       chart.setBackgroundPaint(Color.white);
       final TextTitle subtitle = new TextTitle("An area chart demonstration.  We use this "
           + "subtitle as an example of what happens when you get a really long title or "
           + "subtitle.");
       subtitle.setFont(new Font("SansSerif", Font.PLAIN, 12));
       subtitle.setPosition(RectangleEdge.TOP);

// subtitle.setSpacer(new Spacer(Spacer.RELATIVE, 0.05, 0.05, 0.05, 0.05));

       subtitle.setVerticalAlignment(VerticalAlignment.BOTTOM);
       chart.addSubtitle(subtitle);
       final CategoryPlot plot = chart.getCategoryPlot();
       plot.setForegroundAlpha(0.5f);
       
 //      plot.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 5.0, 5.0, 5.0, 5.0));
       plot.setBackgroundPaint(Color.lightGray);
       plot.setDomainGridlinesVisible(true);
       plot.setDomainGridlinePaint(Color.white);
       plot.setRangeGridlinesVisible(true);
       plot.setRangeGridlinePaint(Color.white);
       
       final CategoryAxis domainAxis = plot.getDomainAxis();
       domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
       domainAxis.setLowerMargin(0.0);
       domainAxis.setUpperMargin(0.0);
       domainAxis.addCategoryLabelToolTip("Type 1", "The first type.");
       domainAxis.addCategoryLabelToolTip("Type 2", "The second type.");
       domainAxis.addCategoryLabelToolTip("Type 3", "The third type.");
       
       final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
       rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
       rangeAxis.setLabelAngle(0 * Math.PI / 2.0);
       // OPTIONAL CUSTOMISATION COMPLETED.
       
       return chart;
       
   }
   
   /**
    * Starting point for the demonstration application.
    *
    * @param args  ignored.
    */
   public static void main(final String[] args) {
       Log.getInstance().addTarget(new PrintStreamLogTarget());
       final AreaChartDemo demo = new AreaChartDemo("Area Chart Demo");
       demo.pack();
       RefineryUtilities.centerFrameOnScreen(demo);
       demo.setVisible(true);
   }

}

      </source>