Java/Chart/Scatter Plot Chart

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JCharts: Scatter Plot

JFreeChart: Fast Scatter Plot 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.]
*
* ------------------------
* FastScatterPlotDemo.java
* ------------------------
* (C) Copyright 2002-2004, by Object Refinery Limited and Contributors.
*
* Original Author:  David Gilbert (for Object Refinery Limited);
* Contributor(s):   -;
*
* $Id: FastScatterPlotDemo.java,v 1.13 2004/04/26 19:11:54 taqua Exp $
*
* Changes (from 29-Oct-2002)
* --------------------------
* 29-Oct-2002 : Added standard header and Javadocs (DG);
* 12-Nov-2003 : Enabled zooming (DG);
*
*/

package org.jfree.chart.demo; import java.awt.RenderingHints; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.plot.FastScatterPlot; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /**

* A demo of the fast scatter plot.
*
*/

public class FastScatterPlotDemo extends ApplicationFrame {

   /** A constant for the number of items in the sample dataset. */
   private static final int COUNT = 500000;
   /** The data. */
   private float[][] data = new float[2][COUNT];
   /**
    * Creates a new fast scatter plot demo.
    *
    * @param title  the frame title.
    */
   public FastScatterPlotDemo(final String title) {
       super(title);
       populateData();
       final NumberAxis domainAxis = new NumberAxis("X");
       domainAxis.setAutoRangeIncludesZero(false);
       final NumberAxis rangeAxis = new NumberAxis("Y");
       rangeAxis.setAutoRangeIncludesZero(false);
       final FastScatterPlot plot = new FastScatterPlot(this.data, domainAxis, rangeAxis);
       final JFreeChart chart = new JFreeChart("Fast Scatter Plot", plot);

// chart.setLegend(null);

       // force aliasing of the rendered content..
       chart.getRenderingHints().put
           (RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
       final ChartPanel panel = new ChartPanel(chart, true);
       panel.setPreferredSize(new java.awt.Dimension(500, 270));
 //      panel.setHorizontalZoom(true);
   //    panel.setVerticalZoom(true);
       panel.setMinimumDrawHeight(10);
       panel.setMaximumDrawHeight(2000);
       panel.setMinimumDrawWidth(20);
       panel.setMaximumDrawWidth(2000);
       
       setContentPane(panel);
   }
   // ****************************************************************************
   // * 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.             *
   // ****************************************************************************
   
   /**
    * Populates the data array with random values.
    */
   private void populateData() {
       for (int i = 0; i < this.data[0].length; i++) {
           final float x = (float) i + 100000;
           this.data[0][i] = x;
           this.data[1][i] = 100000 + (float) Math.random() * COUNT;
       }
   }
   /**
    * Starting point for the demonstration application.
    *
    * @param args  ignored.
    */
   public static void main(final String[] args) {
       final FastScatterPlotDemo demo = new FastScatterPlotDemo("Fast Scatter Plot Demo");
       demo.pack();
       RefineryUtilities.centerFrameOnScreen(demo);
       demo.setVisible(true);
   }

}

      </source>