class Bat(Actor):
"""The class that represents bats in the game world."""
cost = 35
hitbox_height = 50
hitbox_width = 30
hitbox_offset = 0
swoop_delay = 100
swoop_initial_velocity = Vector(5, 5)
swoop_acceleration = Vector(-.1, -.1)
images = [
pygame.image.load("assets/bat/bat1.png"),
pygame.image.load("assets/bat/bat2.png"),
pygame.image.load("assets/bat/bat3.png")
]
__name__ = "Bat"
def __init__(self, xpos, ypos):
super().__init__()
self.__name__ = Bat.__name__
self.image = Bat.images[0]
self.sprite_loop = lsm.create({
0: Bat.images[1],
10: Bat.images[0],
20: Bat.images[2],
30: Bat.images[1],
40: Bat.images[0],
60: lsm.end
})
self.rect = pygame.Rect(xpos-30/2, ypos-30/2, Bat.hitbox_width, Bat.hitbox_height)
self.frames_till_swoop = Bat.swoop_delay
self.velocity = Vector(0, 0)
self.direction = Vector(1, 1)
self.has_pitched = False
self.is_swooping = False
def _render(self):
image = next(self.sprite_loop)
if self.direction.x > 0:
image = pygame.transform.flip(image, True, False)
return image
def _initiate_swoop(self, simon_rect):
self.is_swooping = True
self.velocity = Bat.swoop_initial_velocity
x_direction = 1 if self.rect.x <= simon_rect.x else -1
y_direction = 1 if self.rect.y <= simon_rect.y else -1
self.direction = Vector(x_direction, y_direction)
self.has_pitched = False if y_direction == 1 else True
def _finish_swoop(self):
self.is_swooping = False
self.has_pitched = False
self.frames_till_swoop = Bat.swoop_delay
def _pitch_swoop(self):
self.direction = self.direction.reverse_y()
self.has_pitched = True
def update(self, world):
"""enemy AI processing"""
if not self.is_swooping:
self.frames_till_swoop -= 1
if self.frames_till_swoop <= 0:
self._initiate_swoop(world.simon.rect)
else:
self.velocity = self.velocity.add(Bat.swoop_acceleration).bound(Vector(0, 0))
if self.rect.y >= world.simon.rect.y and not self.has_pitched:
self._pitch_swoop()
if self.velocity.is_zero():
self._finish_swoop()
movement = self.velocity.pointwise_product(self.direction)
self.rect.move_ip(movement.x, movement.y)
self.image = self._render()
