public AngularBond whichAngle(int x, int y) {
		if (bends.isEmpty())
			return null;
		AngularBond aBond = null;
		synchronized (bends.getSynchronizationLock()) {
			for (Iterator it = bends.iterator(); it.hasNext();) {
				aBond = (AngularBond) it.next();
				if (aBond.contains(x, y))
					return aBond;
			}
		}
		return null;
	}