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
rre.setOutline( lia );
		rre.setBackground( ca.getBackground( ) );
		ipr.fillRectangle( rre );
		ipr.drawRectangle( rre );
		lia = LineAttributesImpl.copyInstance( lia );
		lia.setVisible( true ); 
		LineAttributes liSep = lg.getSeparator( ) == null ? lia
				: lg.getSeparator( );
		final SeriesDefinition[] seda = cm.getSeriesForLegend( );
		
		final Orientation o = lg.getOrientation( );
		final Direction d = lg.getDirection( );
		final Label la = LabelImpl.create( );
		la.setCaption( TextImpl.copyInstance( lg.getText( ) ) );
		la.getCaption( ).setValue( "X" ); 
		final ITextMetrics itm = xs.getTextMetrics( la );
		final double dItemHeight = itm.getFullHeight( );
		final double dHorizontalSpacing = 4;
		Insets insCA = ca.getInsets( ).scaledInstance( dScale );
		Series seBase;
		List al;
		LegendItemRenderingHints lirh;
		Palette pa;
		int iPaletteCount;
		EList elPaletteEntries;
		Fill fPaletteEntry;
		final boolean bPaletteByCategory = ( cm.getLegend( )
				.getItemType( )
				.getValue( ) == LegendItemType.CATEGORIES );