repaint();
this.repaint();
    public void setJitter(int j) {      if (j >= 0) {	m_JitterVal = j;	m_JRand = new Random(m_JitterVal);	if (m_pointLookup != null) {	  m_drawnPoints = new int[m_XaxisEnd - m_XaxisStart + 1]	    [m_YaxisEnd - m_YaxisStart + 1];	  updatePturb();	}	repaint();      }    }