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
dX = bo.getLeft( );
			dY = bo.getTop( );
			sz = SizeImpl.create( bo.getWidth( ), bo.getHeight( ) );
		}
		
		final LegendLayoutHints lilh = rtc.getLegendLayoutHints( );
		if ( lilh == null )
		{
			throw new ChartException( ChartEnginePlugin.ID,
					ChartException.RENDERING,
					"exception.null.legend.layout.hints", 
					Messages.getResourceBundle( rtc.getULocale( ) ) );
		}
		
		Label lgTitle = lg.getTitle( );
		double lgTitleWidth = 0, lgTitleHeight = 0;
		double yOffset = 0, xOffset = 0, wOffset = 0, hOffset = 0;
		final boolean bRenderLegendTitle = lgTitle != null
				&& lgTitle.isSetVisible( )
				&& lgTitle.isVisible( );
		int iTitlePos = Position.ABOVE;
		if ( bRenderLegendTitle )
		{
			lgTitle = LabelImpl.copyInstance( lgTitle );
			
			final String sPreviousValue = lgTitle.getCaption( ).getValue( );
			lgTitle.getCaption( )
					.setValue( rtc.externalizedMessage( sPreviousValue ) );