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
if ( drawLeftSide )
					{
						plotPlane( ipr,
								faXY1[0] + fXOffset,
								faXY1[1] + fYOffset,
								faXY2[0] + fXOffset,
								faXY2[1] + fYOffset,
								bRendering3D ? faZ[i] : 0,
								bRendering3D ? faZ[i] : 0,
								true,
								true );
					}
					
					boolean drawRightSide = bFillArea
							&& ( ( !iRender.isRightToLeft( )
									&& i == iNumberOfPoints - 2 && j == iNumberOfDivisions - 1 ) || ( iRender.isRightToLeft( )
									&& i == 0 && j == 0 ) );
					plotPlane( ipr,
							faXY1[0] + fXOffset,
							faXY1[1] + fYOffset,
							faXY2[0] + fXOffset,
							faXY2[1] + fYOffset,
							bRendering3D ? faZ[i] : 0,
							bRendering3D ? faZ[i] : 0,
							drawRightSide,
							iRender.isRightToLeft( ) );
				}
				if ( !bFillArea )
				{