Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
try
			{
				return new double[]{
						asDouble( oMin ).doubleValue( ),
						asDouble( oMax ).doubleValue( )
				};
			}
			catch ( ClassCastException ex )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_SET,
						"exception.datetime.data.numerical.axis",  
						Messages.getResourceBundle( rtc.getULocale( ) ) );
			}
		}
		return null;
	}
	/**
	 * This method computes the entire chart within the given bounds. If the
	 * dataset has changed but none of the axis attributes have changed, simply
	 * re-compute without 'rebuilding axes'.
	 * 
	 * @param bo
	 * 
	 */
	public final void compute( Bounds bo ) throws ChartException,
			IllegalArgumentException
	{
		bo = bo.scaledInstance( dPointToPixel ); 
		dSeriesThickness = ( ids.getDpiResolution( ) / 72d )