def initialize_rotation_in_y(self):
self.transformation_context = "rotation in y"
angle = math.pi / 6.0
cosine_of_angle = math.cos(angle)
sine_of_angle = math.sin(angle)
self.start_position_coordinates = (1.0, 100.0, 200.0, 300.0)
self.stop_position_coordinates = (
1.0,
100.0 * cosine_of_angle + 300.0 * sine_of_angle,
200,
300.0 * cosine_of_angle - 100.0 * sine_of_angle,
)
x = math.sqrt(0.4)
y = math.sqrt(0.5)
z = math.sqrt(0.1)
self.start_direction_coordinates = (0.0, x, y, z)
self.stop_direction_coordinates = (
0.0,
x * cosine_of_angle + z * sine_of_angle,
y,
z * cosine_of_angle - x * sine_of_angle,
)
self.transformation_under_test = Transformation.rotation_about_y_axis(angle)
