public void startPlotThread(){
  if (m_plotThread == null) {
    m_plotThread=new PlotThread();
    m_plotThread.setPriority(Thread.MIN_PRIORITY);
    m_plotThread.start();
  }
}

public void startPlotThread ( ) { if ( m_plotThread == null ) { m_plotThread = new PlotThread ( ) ; m_plotThread . setPriority ( Thread . MIN_PRIORITY ) ; m_plotThread . start ( ) ; } }
starts the plotting thread . will also create it if necessary .
