Java/Chart/Category Step Chart

JFreeChart: Category Step Chart Demo

/* ===========================================================
 * 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);
    }
}