python - Pygame 中的屏幕问题

Question

我的游戏画面有问题。

我已经创建了几个屏幕，但我的“说明”屏幕和“重启”屏幕出现问题。

在我的主菜单中，我有 3 个按钮，分别指向“说明”屏幕、“播放”和“退出”屏幕。

“播放”和“退出”屏幕都可以正常工作。

在我的“说明”屏幕中，我有一些文本和只有“播放”按钮。

当我在主菜单中按下“播放”然后我死了，它会导致“重启”屏幕，我再次拥有“播放”按钮，这样我就可以玩了。

但是如果我从主菜单转到“说明”屏幕，然后转到“开始”按钮，我可以再次玩游戏，但是当我死后，它会引导我进入“说明”屏幕，但我想要它导致“重新启动”屏幕。

代码如下:

import pygame
import sys


pygame.init()
pygame.display.set_caption("My Game")
screen_width, screen_height = 1200, 600
screen = pygame.display.set_mode((screen_width, screen_height))
clock = pygame.time.Clock()
BLUE = pygame.Color('dodgerblue3')
ORANGE = pygame.Color('sienna3')
BLACK = (0, 0, 0)
WHITE = (255,255,255)
RED = (255, 0, 0)
GREEN = (13, 255, 0)
DARK_GREEN = (0, 225, 0)
BRIGHT_GREEN = (0, 255, 0)
YELLOW = (255, 255, 0)
font = pygame.font.Font(None, 25)
frame_rate = 60
image1 = pygame.image.load("/Users/xy/Desktop/menupy2.png")


class Walls(pygame.Rect):

    def __init__(self, x, y, w, h):
        super().__init__(x, y, w, h)


class LeftRedRect(pygame.Rect):

    def __init__(self, x, y, w, h, vel):
        # Calling the __init__ method of the parent class
        super().__init__(x, y, w, h)
        self.vel = vel

    def update(self):
        self.x += self.vel  # Moving
        if self.right > 600 or self.left < 320:  # If it's not in this area
            self.vel = -self.vel  # Inverting the direction


class RightRedRect(pygame.Rect):

    def __init__(self, x, y, w, h, vel):
        super().__init__(x, y, w, h)
        self.vel = vel

    def update(self):
        self.x += self.vel
        if self.right > 1180 or self.left < 620:
            self.vel = -self.vel


class UpAndDownRedRect(pygame.Rect):

    def __init__(self, x, y, w, h, vel):
        super().__init__(x, y, w, h)
        self.vel = vel

    def update(self):
        self.y += self.vel
        if self.top < 20 or self.bottom > 535:
            self.vel = -self.vel

def quit_game():
    pygame.quit()
    sys.exit()

def message_display(text):
    largeText = pygame.font.Font(None, 115)
    screen.blit(largeText.render(text, True, BLUE), (370, 250))
    pygame.display.update()

    pygame.time.wait(1000)

def text_objects(text, font):
    textSurface = font.render(text, True, BLACK)
    return textSurface, textSurface.get_rect()

def button(msg, x, y, w, h, ic, ac, action = None):
    mouse = pygame.mouse.get_pos()
    click = pygame.mouse.get_pressed()


    if x + w > mouse[0] > x and y + h  > mouse[1] > y:
        pygame.draw.rect(screen, ac, (x, y, w, h))
        if click[0] == 1 and action is not None:
            action()
    else:
        pygame.draw.rect(screen, ic, (x, y, w, h))

    smallText = pygame.font.Font("freesansbold.ttf",35)
    textSurf, textRect = text_objects(msg, smallText)
    textRect.center = ((x+(w/2)), (y+(h/2)))
    screen.blit(textSurf, textRect)

def restart():
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        screen.fill(WHITE)

        largeText = pygame.font.Font(None, 115)
        screen.blit(largeText.render("You lost", True, BLUE), (445, 75))

        button("Restart", 525, 250, 150, 60, DARK_GREEN, BRIGHT_GREEN, menu)
        button("Quit", 525, 350, 150, 60, DARK_GREEN, BRIGHT_GREEN, quit_game)


        pygame.display.flip()
        clock.tick(60)

def victory_screen():
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        screen.fill(WHITE)

        largeText = pygame.font.Font(None, 115)
        screen.blit(largeText.render("Congratulations!", True, BLUE), (270, 80))
        largeText = pygame.font.Font(None, 60)
        screen.blit(largeText.render("You beat the game!", True, BLUE), (410, 180))

        button("Restart", 525, 300, 150, 60, DARK_GREEN, BRIGHT_GREEN, menu)
        button("Quit", 525, 400, 150, 60, DARK_GREEN, BRIGHT_GREEN, quit_game)

        pygame.display.update()
        pygame.display.flip()
        clock.tick(frame_rate)

def instructions_screen():
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        screen.fill(WHITE)

        largeText = pygame.font.Font(None, 115)
        smallText = pygame.font.Font(None, 60)
        screen.blit(largeText.render("Instructions", True, BLUE), (362, 50))
        screen.blit(smallText.render("Goal of the game: Reach the yellow rectangle", True, BLACK), (148, 150))
        screen.blit(smallText.render("How to move: Upper arrow - up", True, BLACK), (148, 210))
        screen.blit(smallText.render("Lower arrow - down", True, BLACK), (429, 250))
        screen.blit(smallText.render("Left arrow - left", True, BLACK), (429, 290))
        screen.blit(smallText.render("Right arrow - right", True, BLACK), (429, 330))

        button("Play", 525, 430, 150, 60, DARK_GREEN, BRIGHT_GREEN, menu)

        pygame.display.flip()
        clock.tick(60)

def front_page():
    next_scene = None

    def start_game():
        nonlocal next_scene
        next_scene = menu

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        if next_scene is not None:
            return next_scene

        screen.fill(WHITE)

        screen.blit(image1, (0,0))

        largeText = pygame.font.Font(None, 115)
        screen.blit(largeText.render("My Game", True, BLUE), (430, 50))

        button("Play", 525, 200, 150, 60, DARK_GREEN, BRIGHT_GREEN, start_game)
        button("Quit", 525, 400, 150, 60, DARK_GREEN, BRIGHT_GREEN, quit_game)
        button("Info", 525, 300, 150, 60, DARK_GREEN, BRIGHT_GREEN, instructions_screen)

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


def menu():
    vel = 4
    vel_left = 5
    vel_right = -5
    vel_up = 7

    player = pygame.Rect(40, 45, 30, 30)

    finish_line = pygame.Rect(620, 535, 560, 45)

    walls = [
        Walls(0, 0, 1200, 20), Walls(0, 0, 20, 600),
        Walls(0, 580, 1200, 20), Walls(1180, 0, 20, 600),
        Walls(300, 0, 20, 530), Walls(20, 100, 230, 20),
        Walls(70, 200, 230, 20), Walls(20, 300, 230, 20),
        Walls(70, 400, 230, 20), Walls(600, 100, 20, 500)
    ]

    leftredrects = [
        LeftRedRect(320, 120, 30, 30, vel_left),
        LeftRedRect(320, 240, 30, 30, vel_left),
        LeftRedRect(320, 360, 30, 30, vel_left),
        LeftRedRect(570, 180, 30, 30, vel_right),
        LeftRedRect(570, 300, 30, 30, vel_right),
        LeftRedRect(570, 420, 30, 30, vel_right)
    ]

    rightredrects = [
        RightRedRect(1140, 120, 30, 30, vel_left),
        RightRedRect(1140, 240, 30, 30, vel_left),
        RightRedRect(1140, 360, 30, 30, vel_left),
        RightRedRect(620, 180, 30, 30, vel_right),
        RightRedRect(620, 300, 30, 30, vel_right),
        RightRedRect(620, 420, 30, 30, vel_right),
    ]

    upanddownredrects = [
        UpAndDownRedRect(620, 20, 30, 30, vel_up),
        UpAndDownRedRect(752, 505, 30, 30, vel_up),
        UpAndDownRedRect(885, 20, 30, 30, vel_up),
        UpAndDownRedRect(1016, 505, 30, 30, vel_up),
        UpAndDownRedRect(1150, 20, 30, 30, vel_up)
    ]

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        keys = pygame.key.get_pressed()

        # Player coordinates
        if keys[pygame.K_LEFT] and player.x > 0:
            player.x -= vel
        if keys[pygame.K_RIGHT] and player.x < 1200 - player.width:
            player.x += vel
        if keys[pygame.K_UP] and player.y > 0:
            player.y -= vel
        if keys[pygame.K_DOWN] and player.y < 600 - player.height:
            player.y += vel

        # Game logic
        for wall in walls:
            # Check if the player rectangle collides with a wall rectangle
            if player.colliderect(wall):
                print("Game over")
                message_display("Game Over")
                return restart

        for rect in rightredrects:
            rect.update()  # Movement and bounds checking
            if player.colliderect(rect):
                print("Game over")
                message_display("Game Over")
                return restart

        for rect in leftredrects:
            rect.update()
            if player.colliderect(rect):
                print("Game over")
                message_display("Game Over")
                return restart

        for rect in upanddownredrects:
            rect.update()
            if player.colliderect(rect):
                print("Game over")
                message_display("Game Over")
                return restart

        if player.colliderect(finish_line):
            print("You beat the game")
            victory_screen()

        # Drawing everything
        screen.fill(WHITE)

        pygame.draw.rect(screen, YELLOW, finish_line)

        for wall in walls:
            pygame.draw.rect(screen, BLACK, wall)

        for rect in rightredrects:
            pygame.draw.rect(screen, RED, rect)

        for rect in leftredrects:
            pygame.draw.rect(screen, RED, rect)

        for rect in upanddownredrects:
            pygame.draw.rect(screen, RED, rect)

        pygame.draw.rect(screen, GREEN, player)


        pygame.display.flip()
        clock.tick(60)


def main():
    scene = front_page  # Set the current scene.
    while scene is not None:
        # Execute the current scene function. When it's done
        # it returns either the next scene or None which we
        # assign to the scene variable.
        scene = scene()


main()
pygame.quit()

Answer 1

您必须借助另一个回调函数从 front_page 函数返回 instructions_screen 函数。

def front_page():
    next_scene = None

    def start_game():
        nonlocal next_scene
        next_scene = menu

    def show_instructions_screen():
        nonlocal next_scene
        next_scene = instructions_screen

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                quit_game()

        if next_scene is not None:
            return next_scene

        screen.fill(WHITE)

        screen.blit(image1, (0,0))

        largeText = pygame.font.Font(None, 115)
        screen.blit(largeText.render("My Game", True, BLUE), (430, 50))

        button("Play", 525, 200, 150, 60, DARK_GREEN, BRIGHT_GREEN, start_game)
        button("Quit", 525, 400, 150, 60, DARK_GREEN, BRIGHT_GREEN, quit_game)
        button("Info", 525, 300, 150, 60, DARK_GREEN, BRIGHT_GREEN, show_instructions_screen)

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

您应该在其他函数中执行相同的操作。定义回调函数并返回 next_scene(如果 not None)。通过将下一个场景函数返回给 main 函数而不是直接调用它来切换场景。