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
}
	}
	/**
	 * Filters the Null or invalid entry(contains NaN value) from the list. Each
	 * entry should be a double[2] or double[3] array object.
	 * 
	 * @param ll
	 * @return
	 */
	protected static List filterNull( List ll )
	{
		ArrayList al = new ArrayList( );
		for ( int i = 0; i < ll.size( ); i++ )
		{
			double[] obj = (double[]) ll.get( i );
			if ( obj == null || Double.isNaN( obj[0] ) || Double.isNaN( obj[1] ) )
			{
				continue;
			}
			al.add( obj );
		}
		return al;
	}
	/**
	 * Filters the Null or invalid entry(contains NaN value) from the array.
	 * 
	 * @param ll
	 * @return
	 */
	protected static Location[] filterNull( Location[] ll )