Bug 212370 [Regression] Negative value can not be shown both in chart builder and when preview [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
+ dDelta
						- 1
						: dY2 + 1 - dAxisTitleThickness + dDelta 
				
				
				);
				dBlockLength -= ( dY2 - dY1 ); 
			}
		}
		aax.setBlockCordinates( dBlockStart, dBlockLength );
	}
	private final void updateOverlayAxes( AllAxes aax ) throws ChartException,
			IllegalArgumentException
	{
		int iDirection = ( aax.getOrientation( ) == HORIZONTAL ) ? 1 : -1;
		final Axis[] axa = cwa.getPrimaryBaseAxes( );
		final Axis axPrimaryBase = axa[0]; 
		
		final Axis[] axaOverlayOrthogonal = cwa.getOrthogonalAxes( axPrimaryBase,
				false );
		OneAxis axOverlay, axPrimary = aax.getPrimaryOrthogonal( );
		AutoScale scOA, sc = axPrimary.getScale( );
		double dStart, dEnd;
		Object[] oaMinMax;
		int iAxisType = ( aax.getOverlayCount( ) > 0 ) ? aax.getOverlay( 0 )
				.getScale( )
				.getType( ) : 0;
		Label la;
		for ( int i = 0; i < aax.getOverlayCount( ); i++ )
		{