Tank collides with walls in pygame

Question

I\'ve been working on this project about tanks (based on game Tank Trouble) and I\'ve made walls appear on the screen. How can I make the tank stop when it collides with the wal

Answer 1

Tank is a Sprite object. The walls are Sprite objects, too and collected in the Group wall_list. Thus you can use pygame.sprite.spritecollide() to detect a collision:

if pygame.sprite.spritecollide(self.tank, self.wall_list, False):
    print("tank collides with wall")

Note, pygame.sprite.spritecollide() returns a list of the Wall objects, which caused the collision. In your case the list will probably contain 1 element when the tank collides:

hit_walls = pygame.sprite.spritecollide(self.tank, self.wall_list, False)
if hit_walls:
    hit_wall = hit_walls[0]

Alternatively you can iterate through the walls, which caused the collision:

for hit_wall in pygame.sprite.spritecollide(self.tank, self.wall_list, False):
    # [...]

For instance you can cancel the movement of the tank, when it hits a wall in Game.handle_events:

class Game:
    # [...]

    def handle_events(self):

        tank_pos = pygame.math.Vector2(self.tank.pos)
        self.tank.handle_events()
        if pygame.sprite.spritecollide(self.tank, self.wall_list, False): 
            self.tank.pos = tank_pos
            self.tank.rect.center = round(tank_pos[0]), round(tank_pos[1])

        # [...]