Bug 188029 Top face is missing in Area chart of 2D+ with negative values
Top face is missing in Area chart of 2D+ with negative values. Please see attached screenshot.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
total += ( (NumberDataElement) v ).getValue( );
				}
			}
			dsiDataOrthogonal.reset( );
			for ( int i = 0; i < iBaseCount; i++ )
			{
				oDataBase = dsiDataBase.next( );
				oDataOrthogonal = dsiDataOrthogonal.next( );
				if ( !bScatter )
				{
					if ( aax.areAxesSwapped( ) )
					{
						dY = daTickCoordinates[0] + dUnitSize * i;
						if ( !oaxBase.isTickBwtweenCategories( ) )
						{
							dY += dUnitSize / 2;
						}
						try
						{
							dX = getLocation( scOrthogonal, oDataOrthogonal );
						}
						catch ( IllegalArgumentException nvex )
						{
							
							dX = Double.NaN;
						}
						catch ( ChartException dfex )
						{
							dX = dOrthogonalZero; 
						}