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 ( iNumberOfPoints < 2 )
			{
				return 0.0f;
			}
			int i = 0, iMiddle;
			int iRight = iNumberOfPoints - 1;
			while ( i + 1 < iRight )
			{
				iMiddle = ( i + iRight ) / 2;
				if ( iMiddle <= x )
				{
					i = iMiddle;
				}
				else
				{
					iRight = iMiddle;
				}
			}
			final double t = ( x - i );
			return faA[i] * t * t * t + faB[i] * t * t + faC[i] * t + fa[i];
		}
	}
	private static boolean computeSpline( double t, double[] faXY, Spline spx,
			Spline spy )
	{
		if ( spx == null || spy == null )
		{
			return false;
		}
		faXY[0] = spx.computeValue( t );