Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
protected Engine3D get3DEngine( )
	{
		if ( isDimension3D( ) )
		{
			
			return ( (PlotWith3DAxes) oComputations ).get3DEngine( );
		}
		return null;
	}
	/**
	 * Returns the panning offset for 3D engine.
	 */
	protected Location getPanningOffset( )
	{
		if ( isDimension3D( ) )
		{
			
			return ( (PlotWith3DAxes) oComputations ).getPanningOffset( );
		}
		return null;
	}
	/**
	 * Gets current model Axis
	 * 
	 * @return Returns the axis associated with current renderer.
	 */
	public final Axis getAxis( )
	{
		return ax;
	}