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
dY1 -= TICK_SIZE;
					}
					if ( oaxOverlay.getLabelPosition( ) == ABOVE )
					{
						dY1 -= Math.max( dAxisLabelsThickness,
								dDecorationThickness[0] );
						dY2 += Math.max( bTicksBelow ? TICK_SIZE : 0,
								dAppliedXAxisPlotSpacing );
					}
					else if ( oaxOverlay.getLabelPosition( ) == BELOW )
					{
						dY1 -= dDecorationThickness[0];
						dY2 += Math.max( ( bTicksBelow ? TICK_SIZE : 0 )
								+ dAxisLabelsThickness,
								dAppliedXAxisPlotSpacing );
					}
					if ( iTitleLocation == ABOVE )
					{
						dY1 -= dAxisTitleThickness;
					}
					else if ( iTitleLocation == BELOW )
					{
						dY2 += dAxisTitleThickness;
					}
					
					if ( dY1 < dBlockStart )
					{
						final double dDelta = ( dBlockStart - dY1 );
						dY1 = dBlockStart;
						dY += dDelta;