def __init__(self, mother, y_linear, osc_delay):
Actor.__init__(self, choice(UFO_IMAGES))
self.alive = True
self.mother = mother
self.y_linear = y_linear
self.y = y_linear
self.y_vel = 0.8
self.x1_freq = self.mother.x1_freq
self.x2_freq = self.mother.x2_freq
self.y_freq = self.mother.y_freq
self.osc_delay = osc_delay
self.bomb_rate = self.mother.bomb_rate
self.bomb_drive = self.mother.bomb_drive
self.shield = decide(self.mother.shield_prob)
self.score_factor = self.x1_freq + self.x2_freq + self.y_freq
self.carries_power_up = decide(0.1)
def update(self):
x1_osc = tri_osc(self.x1_freq, 0, WH, self.osc_delay)
x2_osc = tri_osc(self.x2_freq, 0, WH, self.osc_delay)
y_osc = tri_osc(self.y_freq, -50, 50, self.osc_delay)
self.x = x1_osc + x2_osc
self.y_linear += self.y_vel
self.y = self.y_linear + y_osc
if self.top > H:
self.alive = False
if decide(self.bomb_rate) and self.top > 0:
self.drop_bomb()
if self.colliderect(game.ship):
game.ship.hit()