Bug 210635 Incorrect preview of chart after reverse categories.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
{
			if ( aax.areAxesSwapped( ) ) 
			{
				updateOverlayScales( aax, dX, dX + dW, dY, dH );
				dY = aax.getStart( );
				dH = aax.getLength( );
			}
			else
			
			{
				updateOverlayScales( aax, dY - dH, dY, dX, dW );
				dX = aax.getStart( );
				dW = aax.getLength( );
			}
		}
		double dStart, dEnd;
		final Axis[] axa = cwa.getPrimaryBaseAxes( );
		final Axis axPrimaryBase = axa[0];
		final Axis axPrimaryOrthogonal = cwa.getPrimaryOrthogonalAxis( axPrimaryBase );
		Scale sc = axPrimaryBase.getScale( );
		
		AutoScale scPrimaryBase = null;
		OneAxis oaxPrimaryBase = aax.getPrimaryBase( );
		int iAxisType = getAxisType( axPrimaryBase );
		Object oaData = null;
		if ( iAxisType == TEXT || oaxPrimaryBase.isCategoryScale( ) )
		{
			oaData = getTypedDataSet( axPrimaryBase, iAxisType, 0 );
		}
		else if ( ( iAxisType & NUMERICAL ) == NUMERICAL )