Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
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;
	}