Bug 208373 Auto resize Chart to have a single axis without blank
When Chart is within Cross tab, chart axis image should have a single axis only, but there may be much blank in other area. Chart engine should auto resize the image to have the axis with fit size. Meanwhile, report engine should not set size for chart image.
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;
	}