fastscatterplotdemo.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ------------------------
 * FastScatterPlotDemo.java
 * ------------------------
 * (C) Copyright 2002, 2003, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: FastScatterPlotDemo.java,v 1.3 2003/05/29 15:23:32 mungady Exp $
 *
 * Changes (from 29-Oct-2002)
 * --------------------------
 * 29-Oct-2002 : Added standard header and Javadocs (DG);
 *
 */

package org.jfree.chart.demo;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.FastScatterPlot;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * A demo of the fast scatter plot.
 *
 * @author David Gilbert
 */
public class FastScatterPlotDemo extends ApplicationFrame {

    /** A constant for the number of items in the sample dataset. */
    private static final int COUNT = 1440;

    /** The data. */
    private float[][] data = new float[2][COUNT];

    /**
     * Creates a new fast scatter plot demo.
     *
     * @param title  the frame title.
     */
    public FastScatterPlotDemo(String title) {

        super(title);
        populateData();

        ValueAxis domainAxis = new NumberAxis("X");
       // domainAxis.setRange(0, (double) COUNT);
        ValueAxis rangeAxis = new NumberAxis("Y");
       // rangeAxis.setRange(0, 100 + 3 * (double) COUNT);
        FastScatterPlot plot = new FastScatterPlot(data, domainAxis, rangeAxis);
        JFreeChart chart = new JFreeChart("Fast Scatter Plot",
                                          JFreeChart.DEFAULT_TITLE_FONT,
                                          plot, false);
        ChartPanel panel = new ChartPanel(chart, false);
        panel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(panel);
    }

    /**
     * Populates the data array with random values.
     */
    private void populateData() {

        for (int i = 0; i < data[0].length; i++) {

            float x = (float) i + 100;
            data[0][i] = x;
            data[1][i] = 100 + (float) Math.random() * COUNT;
        }

    }

    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        FastScatterPlotDemo demo = new FastScatterPlotDemo("Fast Scatter Plot Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}