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Let snake grow when it hits the prey.

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This commit is contained in:
paulusja 2026-04-23 18:24:42 +02:00
parent 31e85ee33b
commit d820318814
1 changed files with 14 additions and 1 deletions
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13
snake/snake.py
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@ -3,6 +3,7 @@ from game_object import GameObject
from snake_segment import SnakeSegment from snake_segment import SnakeSegment
from snake_state_machine import SnakeStateMachine from snake_state_machine import SnakeStateMachine
from wall import Wall from wall import Wall
from prey import Prey
class Snake(GameObject): class Snake(GameObject):
@ -14,6 +15,7 @@ class Snake(GameObject):
self.__state_machine = SnakeStateMachine() self.__state_machine = SnakeStateMachine()
self.__is_dead = False self.__is_dead = False
self.__shall_grow = False
def __collides_with_wall(self, obj: GameObject): def __collides_with_wall(self, obj: GameObject):
@ -24,10 +26,16 @@ class Snake(GameObject):
return isinstance(obj, Snake) and self.get_bounding_boxes()[0].collidelist(obj.get_bounding_boxes()[1:]) > -1 return isinstance(obj, Snake) and self.get_bounding_boxes()[0].collidelist(obj.get_bounding_boxes()[1:]) > -1
def __collides_with_prey(self, obj: GameObject):
return isinstance(obj, Prey) and self.get_bounding_boxes()[0].colliderect(obj.get_bounding_boxes()[0])
def __update_on_collision(self, game_objs: list[GameObject]) -> None: def __update_on_collision(self, game_objs: list[GameObject]) -> None:
for obj in game_objs: for obj in game_objs:
if self.__collides_with_wall(obj) or self.__collides_with_self(obj): if self.__collides_with_wall(obj) or self.__collides_with_self(obj):
self.__is_dead = True self.__is_dead = True
elif self.__collides_with_prey(obj):
self.__shall_grow = True
def draw(self, surface: pygame.Surface) -> None: def draw(self, surface: pygame.Surface) -> None:
@ -35,6 +43,8 @@ class Snake(GameObject):
segment.draw(surface) segment.draw(surface)
def update(self, user_input: int, game_objs: list[GameObject]) -> None: def update(self, user_input: int, game_objs: list[GameObject]) -> None:
self.__shall_grow = False
if not self.__is_dead: if not self.__is_dead:
self.__update_on_collision(game_objs) self.__update_on_collision(game_objs)
@ -43,7 +53,10 @@ class Snake(GameObject):
new_head = self.__state_machine.get_state().get_next_head(self.__segments[0]) new_head = self.__state_machine.get_state().get_next_head(self.__segments[0])
self.__segments.insert(0, new_head) self.__segments.insert(0, new_head)
if not self.__shall_grow:
self.__segments.pop() self.__segments.pop()
def get_bounding_boxes(self) -> list[pygame.rect.Rect]: def get_bounding_boxes(self) -> list[pygame.rect.Rect]:
return [seg.get_bounding_boxes()[0] for seg in self.__segments] return [seg.get_bounding_boxes()[0] for seg in self.__segments]