/*
*
* 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.
* Achim.Westermann@gmx.de
*
*/
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.
* <p>
*
* 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.
* <p>
*
* @author <a href="mailto:Achim.Westermann@gmx.de">Achim Westermann </a>
*
* @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.
* <p>
*
* @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);
}
}