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
/**
	 * Gets current internal primary orthogonal OneAxis
	 * 
	 * @return internal OneAxis
	 */
	protected final OneAxis getInternalOrthogonalAxis( )
	{
		final AllAxes allAxes = ( (PlotWithAxes) getComputations( ) ).getAxes( );
		if ( allAxes.getOverlayCount( ) == 0 )
		{
			return allAxes.getPrimaryOrthogonal( );
		}
		EList axesList = ( (Axis) getAxis( ).eContainer( ) ).getAssociatedAxes( );
		int index = axesList.indexOf( getAxis( ) );
		if ( index == 0 )
		{
			return allAxes.getPrimaryOrthogonal( );
		}
		return allAxes.getOverlay( index - 1 );
	}
	
	/**
	 * Gets current internal base OneAxis
	 * 
	 * @return internal OneAxis
	 */
	protected final OneAxis getInternalBaseAxis( )
	{
		final AllAxes allAxes = ( (PlotWithAxes) getComputations( ) ).getAxes( );
		return allAxes.getPrimaryBase( );