compassformatdemo.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.]
 *
 * ----------------------
 * CompassFormatDemo.java
 * ----------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: CompassFormatDemo.java,v 1.4 2004/04/27 14:53:09 mungady Exp $
 *
 * Changes
 * -------
 * 18-Feb-2004 : Version 1 (DG);
 *
 */

package org.jfree.chart.demo;

import java.awt.Color;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CompassFormat;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.axis.TickUnits;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYAreaRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.time.Minute;
import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * A demo of the {@link CompassFormat} class.
 *
 */
public class CompassFormatDemo extends ApplicationFrame {

    /**
     * Creates a new demo instance.
     *
     * @param title  the frame title.
     */
    public CompassFormatDemo(final String title) {
        super(title);
        final JFreeChart chart = createChart();
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        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.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.             *
    // ****************************************************************************
    
    /**
     * Creates a sample dataset.
     *
     * @param count  the item count.
     * 
     * @return the dataset.
     */
    private XYDataset createDirectionDataset(final int count) {
        final TimeSeriesCollection dataset = new TimeSeriesCollection();
        final TimeSeries s1 = new TimeSeries("Wind Direction", Minute.class);
        RegularTimePeriod start = new Minute();
        double direction = 180.0;
        for (int i = 0; i < count; i++) {
            s1.add(start, direction);
            start = start.next();
            direction = direction + (Math.random() - 0.5) * 15.0;
            if (direction < 0.0) {
                direction = direction + 360.0;
            }
            else if (direction > 360.0) {
                direction = direction - 360.0;
            }
        }
        dataset.addSeries(s1);
        return dataset;
    }

    /**
     * Creates a sample dataset.
     *
     * @param count  the item count.
     * 
     * @return the dataset.
     */
    private XYDataset createForceDataset(final int count) {
        final TimeSeriesCollection dataset = new TimeSeriesCollection();
        final TimeSeries s1 = new TimeSeries("Wind Force", Minute.class);
        RegularTimePeriod start = new Minute();
        double force = 3.0;
        for (int i = 0; i < count; i++) {
            s1.add(start, force);
            start = start.next();
            force = Math.max(0.5, force + (Math.random() - 0.5) * 0.5);
        }
        dataset.addSeries(s1);
        return dataset;
    }

    /**
     * Creates a sample chart.
     * 
     * @return a sample chart.
     */
    private JFreeChart createChart() {
        final XYDataset direction = createDirectionDataset(600);
        final JFreeChart chart = ChartFactory.createTimeSeriesChart(
            "Time", 
            "Date", 
            "Direction",
            direction,
            true,
            true,
            false
        );

        final XYPlot plot = chart.getXYPlot();
        plot.getDomainAxis().setLowerMargin(0.0);
        plot.getDomainAxis().setUpperMargin(0.0);
        
        // configure the range axis to display directions...
        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setAutoRangeIncludesZero(false);
        final TickUnits units = new TickUnits();
        units.add(new NumberTickUnit(180.0, new CompassFormat()));
        units.add(new NumberTickUnit(90.0, new CompassFormat()));
        units.add(new NumberTickUnit(45.0, new CompassFormat()));
        units.add(new NumberTickUnit(22.5, new CompassFormat()));
        rangeAxis.setStandardTickUnits(units);
        
        // add the wind force with a secondary dataset/renderer/axis
        plot.setRangeAxis(rangeAxis);
        final XYItemRenderer renderer2 = new XYAreaRenderer();
        final ValueAxis axis2 = new NumberAxis("Force");
        axis2.setRange(0.0, 12.0);
        renderer2.setSeriesPaint(0, new Color(0, 0, 255, 128));
        plot.setDataset(1, createForceDataset(600));
        plot.setRenderer(1, renderer2);
        plot.setRangeAxis(1, axis2);
        plot.mapDatasetToRangeAxis(1, 1);
        
        return chart;
    }

    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {
        final CompassFormatDemo demo = new CompassFormatDemo("Compass Format Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

}