Bug 176582 "Show Lines as Curves" does not work correctly for Area Chart [0001]
Description: "Show Lines as Curves" does not work correctly for Area Chart. Build number: 2.2.0.v20070307-1128 Steps to reproduce: 1. New a Area Chart. 2. In "Format Chart" tab, select Series->Value (Y) Series, tick and untick "Show Lines as Curves" checkbox. Expected result: Null value point e is treated the same when tick and untick "Show Lines as Curves" checkbox. Actual result: Null value point e is treated differently (see the screenshot). Error log: N/A
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/BaseRenderer.java
}
		else if ( iProperty == IConstants.AVERAGE )
		{
			for ( int i = 0; i < iCount; i++ )
			{
				dX += loa[i].getX( );
			}
			dX /= iCount;
		}
		return dX;
	}
	/**
	 * post-process the triggers.
	 * 
	 * @param tg
	 *            The Trigger to modify
	 * @param source
	 *            The StructureSource associated with the Trigger
	 */
	public void processTrigger( Trigger tg, StructureSource source )
	{
		
		IActionRenderer iar = getRunTimeContext( ).getActionRenderer( );
		if ( iar != null )
		{
			iar.processAction( tg.getAction( ), source );
		}
		
		if ( StructureType.SERIES_DATA_POINT.equals( source.getType( ) ) )
		{