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
final double dScale = getDeviceScale( );
			Bounds bo = b.getBounds( ).scaledInstance( dScale );
			double dLeft = bo.getLeft( );
			double dTop = bo.getTop( );
			double dWidth = bo.getWidth( );
			double dHeight = bo.getHeight( );
			loaHotspot[0] = LocationImpl.create( dLeft, dTop );
			loaHotspot[1] = LocationImpl.create( dLeft + dWidth, dTop );
			loaHotspot[2] = LocationImpl.create( dLeft + dWidth, dTop + dHeight );
			loaHotspot[3] = LocationImpl.create( dLeft, dTop + dHeight );
			if ( !elTriggers.isEmpty( ) )
			{
				final InteractionEvent iev = (InteractionEvent) ( (EventObjectCache) ipr ).getEventObject( StructureSource.createTitle( b ),
						InteractionEvent.class );
				for ( int t = 0; t < elTriggers.size( ); t++ )
				{
					tg = TriggerImpl.copyInstance( (Trigger) elTriggers.get( t ) );
					processTrigger( tg, StructureSource.createTitle( b ) );
					iev.addTrigger( tg );
				}
				final PolygonRenderEvent pre = (PolygonRenderEvent) ( (EventObjectCache) ipr ).getEventObject( StructureSource.createTitle( b ),
						PolygonRenderEvent.class );
				pre.setPoints( loaHotspot );
				iev.setHotSpot( pre );
				ipr.enableInteraction( iev );
			}
		}
	}
	/**
	 * Creates empty renderer instance.