边界碰撞在 pygame 中只起作用一次

如何解决边界碰撞在 pygame 中只起作用一次

我正在用 python 制作一个蛇游戏，我已经快完成了，但我正在努力解决一个问题。在碰撞方法的主类中，我写了一些代码来检测蛇与屏幕边框的碰撞，如果语句为真，蛇将返回其原始状态。但是，当我运行程序时，碰撞检测只工作一次。之后，蛇可以简单地离开屏幕。提前致谢。

import pygame
import random
pygame.init()

clock = pygame.time.Clock()

# Screen setup
screen_width = 600
screen_height = 600

screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Snake")

cellSize = 20

# Colors
black = (0,0)
white = (255,255,255)
blue = (255,0)
green = (0,255)

# Grid
def draw_grid():
    # Vertical lines
    for x in range(0,screen_height,cellSize):
        pygame.draw.line(screen,white,(x,0),screen_height))

    # Horizontal lines
    for y in range(0,screen_width,(0,y),(screen_width,y))

# Maze
class MAZE:
    def __init__(self):
        self.rect_width = 20
        self.rect_height = 20
        self.rects = []

    def draw_rects(self):
        # Drawing Maze
        pass


# Snake
class SNAKE(MAZE):
    def __init__(self):
        super().__init__()
        self.width = 20
        self.height = 20
        self.speed = 20
        self.initBody = [[3 * cellSize,40],[4 * cellSize,[5 * cellSize,40]]
        self.body = [[3 * cellSize,40]]
        self.rects = []
        self.move = [0,0]
        self.grow = False

    def draw_snake(self):
        # Drawing snake body
        for cor in self.body:
            snake_rect = pygame.Rect(cor[0],cor[1],self.width,self.height)
            self.rects.append(snake_rect)
            pygame.draw.rect(screen,blue,snake_rect)

    def move_snake(self):
        # Key bindings
        key = pygame.key.get_pressed()

        if key[pygame.K_UP]:
            self.move = [0,-1]

        if key[pygame.K_DOWN]:
            self.move = [0,1]

        if key[pygame.K_LEFT]:
            self.move = [-1,0]

        if key[pygame.K_RIGHT]:
            self.move = [1,0]

        if self.move[0] != 0 or self.move[1] != 0:
            # Adding rects to the end of snake body
            new_rect = self.body[-1][:]
            new_rect[0] += self.move[0] * cellSize
            new_rect[1] += self.move[1] * cellSize
            self.body.append(new_rect)
            # Removing rects from tail
            if self.grow == False:
                self.body.pop(0)

        self.grow = False

# Food
class FOOD_1:
    def __init__(self):
        self.width = 20
        self.height = 20
        self.x = 4 * cellSize
        self.y = 4 * cellSize
        self.food_rect = pygame.Rect(self.x,self.y,self.height)
    def draw_food_1(self):
        pygame.draw.rect(screen,green,self.food_rect)


maze = MAZE()
snake = SNAKE()
food_1 = FOOD_1()

class MAIN():
    def __init__(self):
        self.maze = MAZE()
        self.snake = SNAKE()
        self.food_1 = FOOD_1()
    def draw(self):
        self.maze.draw_rects()
        self.snake.draw_snake()
        self.food_1.draw_food_1()
    def move(self):
        self.snake.move_snake()
    def collision(self):
        # Snake and food collision
        for rect in self.snake.rects:
            if rect.colliderect(self.food_1.food_rect):
                self.food_1.x = random.randint(0,29) * cellSize
                self.food_1.y = random.randint(0,29) * cellSize
                self.food_1.food_rect.topleft = (self.food_1.x,self.food_1.y)
                self.snake.grow = True
        # Border collisions
        if self.snake.body[-1][0] <= 0:
            self.snake.body = self.snake.initBody
        elif self.snake.body[-1][0] >= 600:
            self.snake.body = self.snake.initBody
        elif self.snake.body[-1][1] <= 0:
            self.snake.body = self.snake.initBody
        elif self.snake.body[-1][1] >= 600:
            self.snake.body = self.snake.initBody

main = MAIN()

# Main loop
run = True
while run:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    # Drawing on screen
    screen.fill(black)
    main.draw()
    draw_grid()

    # Movement and Collisions
    main.move()
    main.collision()

    pygame.display.flip()
    clock.tick(10)

pygame.quit()

解决方法

当您执行 self.snake.body = self.snake.initBody 时，您不是在复制 initBody，而是将 body 定义为与 {{1} 相同的对象 }，所以当你修改一个的时候，另一个也被修改了......这是在玩的时候发生的。

所以在第一次碰撞之后，initBody 与 initBody 同时被修改（因为它们已经成为相同的东西），所以当另一个碰撞发生时，第 body 行什么都不做。

您需要将其替换为 self.snake.body = self.snake.initBody，以便原始 self.snake.body = self.snake.initBody.copy() 保持不变。

,

最好在循环中编写这样的代码。

if playerx = 0:
   playerx = 0
if playerx = 600:
   playerx = 600:

对 y 轴也使用相同的方法。