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
* @throws RenderingException
	 */
	private final void plotLine( IPrimitiveRenderer ipr, double x1, double y1,
			double x2, double y2, double z1, double z2 ) throws ChartException
	{
		if ( bRendering3D )
		{
			final Line3DRenderEvent lre = (Line3DRenderEvent) ( (EventObjectCache) ipr ).getEventObject( oSource,
					Line3DRenderEvent.class );
			lre.setLineAttributes( lia );
			lre.setStart3D( Location3DImpl.create( x1 + kError, y1 + kError, z1 ) );
			lre.setEnd3D( Location3DImpl.create( x2 + kError, y2 + kError, z2 ) );
			dc.addLine( lre );
		}
		else
		{
			final LineRenderEvent lre = (LineRenderEvent) ( (EventObjectCache) ipr ).getEventObject( oSource,
					LineRenderEvent.class );
			lre.setLineAttributes( lia );
			loStart.set( x1 + kError, y1 + kError );
			loEnd.set( x2 + kError, y2 + kError );
			lre.setStart( loStart );
			lre.setEnd( loEnd );
			if ( bDeferred )
			{
				dc.addLine( lre );
			}
			else
			{
				ipr.drawLine( lre );