Java/Chart/Category Step Chart

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JFreeChart: Category Step 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.]
*
* -----------------------------
* CategoryStepRendererDemo.java
* -----------------------------
* (C) Copyright 2004, by Object Refinery Limited and Contributors.
*
* Original Author:  David Gilbert (for Object Refinery Limited);
* Contributor(s):   -;
*
* $Id: CategoryStepChartDemo.java,v 1.2 2004/04/26 19:11:53 taqua Exp $
*
* Changes
* -------
* 21-Apr-2004 : Version 1 (DG);
*
*/

package org.jfree.chart.demo; import java.awt.Color; import java.awt.Dimension; 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.axis.ValueAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.renderer.category.CategoryItemRenderer; import org.jfree.chart.renderer.category.CategoryStepRenderer; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; import org.jfree.ui.Spacer; /**

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

public class CategoryStepChartDemo extends ApplicationFrame {

   /**
    * Creates a new demo application.
    *
    * @param title  the frame title.
    */
   public CategoryStepChartDemo(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 CategoryItemRenderer renderer = new CategoryStepRenderer(true);
       final CategoryAxis domainAxis = new CategoryAxis("Category");
       final ValueAxis rangeAxis = new NumberAxis("Value");
       final CategoryPlot plot = new CategoryPlot(dataset, domainAxis, rangeAxis, renderer);
       final JFreeChart chart = new JFreeChart("Category Step Chart", plot);

       // 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);
       

// 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);
       
       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.");
       
       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) {
       final CategoryStepChartDemo demo = new CategoryStepChartDemo("Category Step Renderer Demo");
       demo.pack();
       RefineryUtilities.centerFrameOnScreen(demo);
       demo.setVisible(true);
   }

}


      </source>