def reflected_velocity(self, delta_time: float,
boid: Boid) -> Tuple[float, float]:
"""Returns the x and y movements, if these would take the boid outside of the window
boundary then (0, 0) is returned and the velocity is reflected"""
x_velocity = boid.x_velocity
y_velocity = boid.y_velocity
delta_x = x_velocity * delta_time
delta_y = y_velocity * delta_time
if self.on_border(boid, delta_x, delta_y):
if self.on_vertical_border(boid, delta_y):
x_velocity = -x_velocity
if self.on_horizontal_border(boid, delta_x):
y_velocity = -y_velocity
rotation = Vector(x_velocity,
y_velocity).rotation_normalized() * 3.14
if x_velocity < 0:
boid.rotation = rotation
else:
boid.rotation = -rotation
return (0, 0)
else:
return (delta_x, delta_y)
