Enhancement request: Rotary encoder about bluedot HOT 4 CLOSED

def calc_rotation(prev, current):
    delta = current - prev
    if -180 < delta <= 180:
        pass
    elif delta > 180:
        delta = delta - 360
    elif delta <= -180:
        delta = delta + 360
    return delta

from bluedot import BlueDot
from signal import pause

bd = BlueDot()
prev_angle = 0


def calc_rotation(prev, current):
    delta = current - prev
    if -180 < delta <= 180:
        pass
    elif delta > 180:
        delta = delta - 360
    elif delta <= -180:
        delta = delta + 360
    return delta


def move(pos):
    global prev_angle
    current_angle = pos.angle
    turn = calc_rotation(prev_angle, current_angle)
    print('Moved ', turn)
    prev_angle = current_angle

bd.when_moved = move

pause()

import unittest
from click_wheel.click_wheel import calc_rotation


class GetRotation(unittest.TestCase):
    def test_anti_clk(self):
        self.assertEqual(calc_rotation(120, 100),
                         -20)

    def test_clkwise(self):
        self.assertEqual(calc_rotation(100, 120),
                         20)

    def test_bndry_anti_clk(self):
        self.assertEqual(calc_rotation(10, -10),
                         -20)

    def test_bndry_clkwise(self):
        self.assertEqual(calc_rotation(-10, 10),
                         20)

    def test_south_bndry_anti_clk(self):
        self.assertEqual(calc_rotation(-170, 170),
                         -20)

    def test_south_bndry_clkwse(self):
        self.assertEqual(calc_rotation(170, -170),
                         20)


if __name__ == '__main__':
    unittest.main()