python - 蛇和苹果不对齐

Question

我正在学习如何使用 Python 3.6 的 PyGame 模块，在获取知识的过程中，我决定创建一个贪吃蛇游戏。我的游戏代码如下，除了蛇和苹果没有对齐之外，一切似乎都工作正常，如果它们没有对齐，吃苹果就非常困难。 (如果有帮助的话，它们仅相差几个像素)

# Imports
import pygame
import random

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

# Setup
pygame_init = pygame.init()
dis_width = 1000
dis_height = 600
window = pygame.display.set_mode((dis_width, dis_height))
pygame.display.set_caption("Slither")
window.fill(white)
fps = 10
clock = pygame.time.Clock()
size = 25
apple = [[0, 0]]
snake = [[0, 0]]
x_step, y_step = 0, 0
apples_ate = 0

# Game Loop
main_menu = True
play_game = False
death_screen = False
while True:
    # Main Menu
    while main_menu:
        # Setup
        snake = [[(dis_width - 200) / 2, dis_height / 2, size]]
        apple = [[random.randrange(0, dis_width - 200 - size), random.randrange(0, dis_height - size), size]]

        # Message
        x_step, y_step = 0, 0
        window.fill(black, rect=[0, 0, dis_width, dis_height])
        font = pygame.font.SysFont(None, 50)
        window.blit(font.render("Press 'Space' To Continue", True, green), [100, 200])
        pygame.display.update()

        # Event Handler
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:
                    main_menu = False
                    play_game = True

    # Play Menu
    while play_game:

        # Event Handler
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP:
                    y_step = -size
                    x_step = 0
                elif event.key == pygame.K_DOWN:
                    y_step = size
                    x_step = 0
                elif event.key == pygame.K_LEFT:
                    x_step = -size
                    y_step = 0
                elif event.key == pygame.K_RIGHT:
                    x_step = size
                    y_step = 0

        # Boundries
        if snake[0][0] + x_step < 0 or snake[0][0] + x_step > dis_width - size - 200:
            play_game = False
            death_screen = True
        elif snake[0][1] + y_step < 0 or snake[0][1] + y_step > dis_height - size:
            play_game = False
            death_screen = True
        else:
            snake[0][0] += x_step
            snake[0][1] += y_step

        # Apple Test
        if apple[0][0] == snake[0][0]:
            apple = [[random.randrange(0, dis_width - 200 - size), 
random.randrange(0, dis_height - size), size]]
            apples_ate += 1

        # Draws
        window.fill(white, rect=[dis_width - 200, 0, 200, dis_height])
        window.fill(black, rect=[0, 0, dis_width - 200, dis_height])
        font = pygame.font.SysFont(None, 50)
        window.blit(font.render("SCORE:", True, black), [dis_width - 200, 0])
        window.blit(font.render(str(apples_ate), True, black), [dis_width - 200, 50])
        pygame.draw.rect(window, red, [apple[0][0], apple[0][1], size, size])
        pygame.draw.rect(window, green, [snake[0][0], snake[0][1], size, size])
        pygame.display.update()
        clock.tick(fps)

    # Death Screen
    while death_screen:
        # Message
        window.fill(black, rect=[0, 0, dis_width - 200, dis_height])
        font = pygame.font.SysFont(None, 50)
        window.blit(font.render("You died.", True, red), [100, 100])
        window.blit(font.render("Press 'A' To Play Again.", True, red), [100, 200])
        window.blit(font.render("Press 'Q' To Quit", True, red), [100, 300])
        pygame.display.update()

        # Event Handler
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_a:
                    main_menu = True
                    death_screen = False
                elif event.key == pygame.K_q:
                    pygame.quit()
                    quit()

Answer 1

您的错误位于 apple = [[random.randrange(0, dis_width - 200 - size), random.randrange(0, dis_height - size), size]]。苹果位置可以是 (0,800) 内的任何值。所以它可以是12 835 125，而你的蛇位于(400,300)即(dis_width/2 -200,dis_height)。并且您将 x_step 指定为 +/-25，size 这是蛇的运动。
因此，您的蛇位置会减少或增加 25。0,25,50,.....,375,400,425,.....,750,775。如果你的苹果位置是 125 或 275 [125 % 25 = 0] 就没有问题。
但是如果你的苹果位置是 122 Boom... if apple[0][0] == Snake[0][0]: 你的蛇永远不能吃他最喜欢的东西水果。解决方案是在 randrange 函数中添加步骤 apple = [[random.randrange(0, dis_width - 200 - size,size), random.randrange(0, dis_height - size,size), size]]这将在范围内生成随机数0,25,50,.....,725,750,775(我不知道如果生成解决的话它也会生成800)。

还有其他小错误if apple[0][0] == Snake[0][0]:你也必须匹配蛇位置的x和y，编辑它如果 apple[0][0] == Snake[0][0] 且 apple[0][1] == Snake[0][1]: .