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/AxisSubUnit.java
return dValueLast;
		}
		if ( dValue > 0 )
		{
			return dValueLast;
		}
		if ( dValue < 0 )
		{
			return dValueLastNegative;
		}
		return dValueLast;
	}
	
	
	public final void computeTotal( double dValue )
	{
		if ( bStackTogether )
		{
			this.dTotal += dValue;
		}
		if ( dValue > 0 )
		{
			this.dPositiveTotal += dValue;
		}
		else if ( dValue < 0 )
		{
			this.dNegativeTotal += dValue;
		}
	}
	/**