Bug 123736 Underline, linethrough, overline doesn't work for chart font.
Description: Underline, linethrough, overline doesn't work for chart font. Steps to teproduce: 1. Add a style, set its font. 2. Tick "underline", "linethrough" and "overline". 3. Preview. Font setting doesn't work.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/util/ChartUtil.java
if ( dAngle > 90 && dAngle < 180 )
		{
			return 2;
		}
		if ( dAngle > 180 && dAngle < 270 )
		{
			return 3;
		}
		else
		{
			return 4;
		}
	}
	/**
	 * Returns if two polygons intersect.
	 * 
	 * @param pg1
	 * @param pg2
	 * @return
	 */
	public static boolean intersects( IPolygon pg1, IPolygon pg2 )
	{
		IPolygon result = Clip.intersection( pg1, pg2 );
		return !result.isEmpty( );
	}
	/**
	 * Merges two fonts to the original one from a source. The original one can
	 * not be null. Only consider inheritable properties.
	 * 
	 * @param original