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JChart2D is an easy to use component for displaying two- dimensional traces in a coordinate system written in Java.

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/*
 *
 *  RandomDataCollector.java  of project jchart2d, collects random data for 
 *  demo purposes. 
 *  Copyright (C) 2004 - 2011 Achim Westermann, created on 10.12.2004, 15:04:16
 *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  If you modify or optimize the code in a useful way please let me know.
 *  [email protected]
 *
 */
package info.monitorenter.gui.chart.io;

import info.monitorenter.gui.chart.ITrace2D;
import info.monitorenter.gui.chart.ITracePoint2D;
import info.monitorenter.gui.chart.TracePoint2D;


/**
 * A proof of concept dummy implementation for the supertype.
 * 
 * 
 * Only collects random values with timestamp on the x axis. The timestamp is
 * related to the time when this instance is instantiated to make it a lower
 * value (offset to start). implementation for exact timestamps that may be
 * formatted with java.text.DateFormat instances.
 * 

 * 
 * @author Achim Westermann 
 * 
 * @version $Revision: 1.9 $
 */
public class RandomDataCollectorOffset extends ADataCollector {

  /** The start time of this collector. */
  private long m_starttime = System.currentTimeMillis();

  /** The last y value added. */
  private double m_y = 0.0;

  /**
   * Creates a collector that collectes every latency ms a point and adds it to
   * the trace.
   * 
   * 
   * @param trace
   *          the trace to add points to.
   * 
   * @param latency
   *          the interval for collection of points.
   */
  public RandomDataCollectorOffset(final ITrace2D trace, final int latency) {
    super(trace, latency);
  }

  /**
   * @see ADataCollector#collectData()
   */
  @Override
  public ITracePoint2D collectData() {
    double rand = Math.random();
    boolean add = (rand >= 0.5) ? true : false;
    this.m_y = (add) ? this.m_y + Math.random() : this.m_y - Math.random();
    return new TracePoint2D(((double) System.currentTimeMillis() - this.m_starttime), this.m_y);
  }
}