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Fix bug that prey might be placed elsewhere when prey's collision detection is done before snake's collision detection: Replace prey in following update step and not during collision detection.

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paulusja 2026-04-23 18:26:21 +02:00
parent d820318814
commit a34198e290
1 changed files with 14 additions and 7 deletions
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21
snake/prey.py
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@ -8,26 +8,33 @@ class Prey(GameObject):
self.__bounding_box = pygame.rect.Rect(0, 0, size, size) self.__bounding_box = pygame.rect.Rect(0, 0, size, size)
self.__color = color self.__color = color
self.__window_size = window_size self.__window_size = window_size
self.__next_pos = None
self.__place_randomly() self.__place_randomly()
def __place_randomly(self) -> None: def __place_randomly(self) -> None:
self.__bounding_box.center = [random.randint(0, max_val) self.__next_pos = [random.randint(0, max_val)
for max_val in self.__window_size] for max_val in self.__window_size]
def __collides_with_other(self, game_objs: list[GameObject]) -> bool: def __collides_with_other(self, pos: tuple, game_objs: list[GameObject]) -> bool:
box = pygame.rect.Rect(self.__bounding_box)
box.center = pos
for obj in game_objs: for obj in game_objs:
if not isinstance(obj, Prey) and self.get_bounding_boxes()[0].collidelist(obj.get_bounding_boxes()) > -1: if not isinstance(obj, Prey) and box.collidelist(obj.get_bounding_boxes()) > -1:
return True return True
def draw(self, surface: pygame.surface.Surface) -> None: def draw(self, surface: pygame.surface.Surface) -> None:
pygame.draw.rect(surface, color=self.__color, rect=self.__bounding_box) pygame.draw.rect(surface, color=self.__color, rect=self.__bounding_box)
def update(self, user_input: int, game_objs: list[GameObject]): def update(self, user_input: int, game_objs: list[GameObject]):
while self.__collides_with_other(game_objs): self.__bounding_box.center = self.__next_pos
self.__place_randomly()
while self.__collides_with_other(self.__next_pos, game_objs):
self.__place_randomly()
def get_bounding_boxes(self) -> list[pygame.rect.Rect]: def get_bounding_boxes(self) -> list[pygame.rect.Rect]:
return [self.__bounding_box] return [self.__bounding_box]