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/BaseRenderer.java
double dLength, Orientation o ) throws ChartException
	{
		if ( o.getValue( ) == Orientation.HORIZONTAL )
		{
			final LineRenderEvent lre = (LineRenderEvent) ( (EventObjectCache) ipr ).getEventObject( StructureSource.createLegend( lg ),
					LineRenderEvent.class );
			lre.setLineAttributes( lia );
			lre.setStart( LocationImpl.create( dX, dY ) );
			lre.setEnd( LocationImpl.create( dX + dLength, dY ) );
			ipr.drawLine( lre );
		}
		else if ( o.getValue( ) == Orientation.VERTICAL )
		{
			final LineRenderEvent lre = (LineRenderEvent) ( (EventObjectCache) ipr ).getEventObject( StructureSource.createLegend( lg ),
					LineRenderEvent.class );
			lre.setLineAttributes( lia );
			lre.setStart( LocationImpl.create( dX, dY ) );
			lre.setEnd( LocationImpl.create( dX, dY + dLength ) );
			ipr.drawLine( lre );
		}
	}
	/**
	 * Search the width for each column when legend is vertical.
	 * 
	 * @param liha
	 * @return
	 */
	protected Map searchMaxColumnWidth( LegendItemHints[] liha )
	{
		HashMap rt = new HashMap( );