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
Size titleSize = lilh.getTitleSize( );
			lgTitleWidth = titleSize.getWidth( );
			lgTitleHeight = titleSize.getHeight( );
			iTitlePos = lg.getTitlePosition( ).getValue( );
			
			if ( isRightToLeft( ) )
			{
				if ( iTitlePos == Position.LEFT )
				{
					iTitlePos = Position.RIGHT;
				}
				else if ( iTitlePos == Position.RIGHT )
				{
					iTitlePos = Position.LEFT;
				}
			}
			switch ( iTitlePos )
			{
				case Position.ABOVE :
					yOffset = lgTitleHeight;
					hOffset = -yOffset;
					break;
				case Position.BELOW :
					hOffset = -lgTitleHeight;
					break;
				case Position.LEFT :
					xOffset = lgTitleWidth;
					wOffset = -xOffset;
					break;
				case Position.RIGHT :