Simple JChart question

Hello!
I'm new to JCharts.
I'm trying to modify the "ScatterPlotChartServlet" example to do what I 
need.

The actual code in "ScatterPlotChartServlet" looks like the following:

  private ScatterPlotDataSet createScatterPlotDataSet() {
      Point2D.Double[] points = new Point2D.Double[ 20 ];
      Point2D.Double[] points2 = new Point2D.Double[ 20 ];
      for( int x = 0; x < 20; x++ ) {
          //--- y = x2
          points[ x ] = ScatterPlotDataSet.createPoint2DDouble();
          points[ x ].setLocation( x, Math.pow(x,2 ) );        }
      ScatterPlotDataSet scatterPlotDataSet = new ScatterPlotDataSet( 
this.createScatterPlotProperties() );
      scatterPlotDataSet.addDataPoints( points, Color.red, "Proprietary" );
      return scatterPlotDataSet;
  }

   Me, I'd like to draw 3 graphs, for instance  :
y=Math.pow(x,2)
y=Math.pow(x,3)
y=Math.sin(Math.PI*x)

on the SAME chart.

My question is: How can I modify the code of the 
"ScatterPlotChartServlet" above to have 3 graphs on the SAME chart?
creating two others points2[] and points3[]  objects for the 2 remaining 
graphs did not help.

Thanks.

AA.



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