xystepchartdemo.java

JfreeChart 常用图表例子

/* ===========================================================
 * 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.]
 *
 * --------------------
 * XYStepChartDemo.java
 * --------------------
 * (C) Copyright 2002-2004, by Roger Studner and Contributors.
 *
 * Original Author:  Roger Studner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: XYStepChartDemo.java,v 1.13 2004/04/26 19:40:15 taqua Exp $
 *
 * Changes
 * -------
 * 13-May-2002 : Version 1, contributed by Roger Studner (DG);
 * 11-Oct-2002 : Moved create method to ChartFactory class, and fixed issues reported by
 *               Checkstyle (DG);
 *
 */
package org.jfree.chart.demo;

import java.awt.BasicStroke;
import java.awt.Color;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.date.DateUtilities;
import org.jfree.ui.RefineryUtilities;

/**
 * A demonstration of the {@link org.jfree.chart.renderer.XYStepRenderer} class.
 *
 * @author Roger Studner
 */
public class XYStepChartDemo {

    /** A frame for displaying the chart. */
    private ChartFrame frame = null;

    /**
     * Displays a sample chart in its own frame.
     */
    private void displayChart() {

        if (this.frame == null) {

            // create a default chart based on some sample data...
            final String title = "LCACs in use at given time";
            final String xAxisLabel = "Time";
            final String yAxisLabel = "Number of Transports";

            final XYDataset data = createStepXYDataset();

            final JFreeChart chart = ChartFactory.createXYStepChart(
                title,
                xAxisLabel, yAxisLabel,
                data,
                PlotOrientation.VERTICAL,
                true,   // legend
                true,   // tooltips
                false   // urls
            );

            // then customise it a little...
            chart.setBackgroundPaint(new Color(216, 216, 216));
            final XYPlot plot = chart.getXYPlot();
            plot.getRenderer().setSeriesStroke(0, new BasicStroke(2.0f));
            plot.getRenderer().setSeriesStroke(1, new BasicStroke(2.0f));
            
            // and present it in a frame...
            this.frame = new ChartFrame("Plan Comparison", chart);
            this.frame.pack();
            RefineryUtilities.positionFrameRandomly(this.frame);
            this.frame.setVisible(true);

        }
        else {
            this.frame.setVisible(true);
            this.frame.requestFocus();
        }

    }

    /**
     * Creates and returns a sample dataset for the XY 'Step' chart.
     *
     * @return the sample dataset.
     */
    public static XYDataset createStepXYDataset() {

        final int feb = 2;
        final XYSeries s1 = new XYSeries("Plan 1", false, true);
        s1.add(DateUtilities.createDate(2002, feb, 19, 8, 0).getTime(), 0);
        s1.add(DateUtilities.createDate(2002, feb, 19, 8, 1).getTime(), 2);
        s1.add(DateUtilities.createDate(2002, feb, 19, 9, 5).getTime(), 4);
        s1.add(DateUtilities.createDate(2002, feb, 19, 10, 6).getTime(), 4);
        s1.add(DateUtilities.createDate(2002, feb, 19, 11, 6).getTime(), 5);
        s1.add(DateUtilities.createDate(2002, feb, 19, 12, 6).getTime(), 3);
        s1.add(DateUtilities.createDate(2002, feb, 19, 13, 6).getTime(), 6);
        s1.add(DateUtilities.createDate(2002, feb, 19, 14, 6).getTime(), 6);
        s1.add(DateUtilities.createDate(2002, feb, 19, 15, 30).getTime(), 2);
        s1.add(DateUtilities.createDate(2002, feb, 19, 16, 7).getTime(), 0);

        final XYSeries s2 = new XYSeries("Plan 2");
        s2.add(DateUtilities.createDate(2002, feb, 19, 8, 40).getTime(), 0);
        s2.add(DateUtilities.createDate(2002, feb, 19, 8, 45).getTime(), 1);
        s2.add(DateUtilities.createDate(2002, feb, 19, 9, 0).getTime(), 6);
        s2.add(DateUtilities.createDate(2002, feb, 19, 10, 6).getTime(), 2);
        s2.add(DateUtilities.createDate(2002, feb, 19, 10, 45).getTime(), 4);
        s2.add(DateUtilities.createDate(2002, feb, 19, 12, 0).getTime(), 7);
        s2.add(DateUtilities.createDate(2002, feb, 19, 13, 0).getTime(), 5);
        s2.add(DateUtilities.createDate(2002, feb, 19, 14, 6).getTime(), 4);
        s2.add(DateUtilities.createDate(2002, feb, 19, 15, 15).getTime(), 4);
        s2.add(DateUtilities.createDate(2002, feb, 19, 16, 0).getTime(), 0);

        final XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(s1);
        dataset.addSeries(s2);
        return dataset;
    }

    // ****************************************************************************
    // * JFREECHART DEVELOPER GUIDE                                               *
    // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
    // * to purchase from Object Refinery Limited:                                *
    // *                                                                          *
    // * http://www.object-refinery.com/jfreechart/guide.html                     *
    // *                                                                          *
    // * Sales are used to provide funding for the JFreeChart project - please    * 
    // * support us so that we can continue developing free software.             *
    // ****************************************************************************
    
    /**
     * The starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {

        final XYStepChartDemo demo = new XYStepChartDemo();
        demo.displayChart();

    }

}