Bug 176582 "Show Lines as Curves" does not work correctly for Area Chart [0001]
Description: "Show Lines as Curves" does not work correctly for Area Chart. Build number: 2.2.0.v20070307-1128 Steps to reproduce: 1. New a Area Chart. 2. In "Format Chart" tab, select Series->Value (Y) Series, tick and untick "Show Lines as Curves" checkbox. Expected result: Null value point e is treated the same when tick and untick "Show Lines as Curves" checkbox. Actual result: Null value point e is treated differently (see the screenshot). Error log: N/A
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/CurveRenderer.java
}
		}
	}
	/**
	 * 
	 * @param t
	 * @param faXY
	 * @return
	 */
	private final boolean computeSpline( double t, double[] faXY )
	{
		if ( spX == null || spY == null )
		{
			return false;
		}
		faXY[0] = spX.computeValue( t );
		faXY[1] = spY.computeValue( t );
		return true;
	}
	/**
	 * @param ipr
	 * @param points
	 * @throws ChartException
	 */
	private final void plotArea( IPrimitiveRenderer ipr, List points )
			throws ChartException
	{
		if ( points == null || points.size( ) < 1 )
		{
			return;