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/CurveRenderer.java
ipr.fillPolygon( pre );
			}
			if ( drawSide )
			{
				pre.setBackground( sideColor );
				if ( leftSide )
				{
					loa[0].set( x1 + kError, y1 + kError );
					loa[1].set( x1 + kError + dTapeWidth, y1
							+ kError - dTapeWidth );
					if ( cwa.isTransposed( ) )
					{
						loa[2].set( zeroLocation + dTapeWidth, y1
								+ kError - dTapeWidth );
						loa[3].set( zeroLocation, y1 + kError );
					}
					else
					{
						loa[2].set( x1 + kError + dTapeWidth, zeroLocation
								- dTapeWidth );
						loa[3].set( x1 + kError, zeroLocation );
					}
				}
				else
				{
					loa[0].set( x2 + kError, y2 + kError );
					loa[1].set( x2 + kError + dTapeWidth, y2
							+ kError - dTapeWidth );
					if ( cwa.isTransposed( ) )
					{