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
/**
	 * Internally used to simulate a translucent shadow
	 */
	public static final ColorDefinition SHADOW = ColorDefinitionImpl.create( 64,
			64,
			64,
			127 );
	/**
	 * Internally used to darken a tiled image with a translucent dark grey
	 * color
	 */
	protected static final ColorDefinition DARK_GLASS = ColorDefinitionImpl.create( 64,
			64,
			64,
			127 );
	/**
	 * Internally used to brighten a tiled image with a translucent light grey
	 * color
	 */
	protected static final ColorDefinition LIGHT_GLASS = ColorDefinitionImpl.create( 196,
			196,
			196,
			127 );
	/**
	 * Transparency for translucent color. Should between 0 and 100.
	 */
	protected static double OVERRIDE_TRANSPARENCY = 50;
	/**
	 * The associated runtimeContext.
	 */