protected double manageround(double angle) {
		final double deg = angle * 180.0 / Math.PI;
		if (isCloseToo(0, deg)) {
			return 0;
		}
		if (isCloseToo(90, deg)) {
			return 90.0 * Math.PI / 180.0;
		}
		if (isCloseToo(180, deg)) {
			return 180.0 * Math.PI / 180.0;
		}
		if (isCloseToo(270, deg)) {
			return 270.0 * Math.PI / 180.0;
		}
		if (isCloseToo(360, deg)) {
			return 0;
		}
		return angle;
	}