private boolean allLocationsVisible() {
		boolean result = true;
		int nbrOfLocations = locations.size();
		for (int index = 0; index < nbrOfLocations; index++) {
			Point pixelPosition = getPixelPosition(locations.get(index));
			if (!validPixelPosition(pixelPosition)) {
				result = false;
				break;
			}
		}
		
		return result;
	}