Pygame菜单不能正常工作

Question

我想做一个python游戏的菜单。这款游戏非常简单，但独立运行效果很好。然而，当我创建这个菜单时，它运行得很好，直到我包含游戏本身。它运行游戏，然后同时启动菜单。这个想法是启动菜单，并有开始和退出选项:开始启动游戏，退出退出。

下面是菜单代码:

#!/usr/bin/python
import sys
import pygame
import os
pygame.init()
WHITE = (255, 255, 255)
RED = (255, 0, 0)
BLACK = (0, 0, 0)
class MenuItem(pygame.font.Font):
    def __init__(self, text, font=None, font_size=30,
                 font_color=WHITE, (pos_x, pos_y)=(0, 0)):
        pygame.font.Font.__init__(self, font, font_size)
        self.text = text
        self.font_size = font_size
        self.font_color = font_color
        self.label = self.render(self.text, 1, self.font_color)
        self.width = self.label.get_rect().width
        self.height = self.label.get_rect().height
        self.dimensions = (self.width, self.height)
        self.pos_x = pos_x
        self.pos_y = pos_y
        self.position = pos_x, pos_y
    def is_mouse_selection(self, (posx, posy)):
        if (posx >= self.pos_x and posx <= self.pos_x + self.width) and 
            (posy >= self.pos_y and posy <= self.pos_y + self.height):
                return True
        return False
    def set_position(self, x, y):
        self.position = (x, y)
        self.pos_x = x
        self.pos_y = y
    def set_font_color(self, rgb_tuple):
        self.font_color = rgb_tuple
        self.label = self.render(self.text, 1, self.font_color)
class BadgerDefense():
    def __init__(self, screen, items, funcs, bg_color=BLACK, font=None, font_size=30,
                 font_color=WHITE):
        self.screen = screen
        self.scr_width = self.screen.get_rect().width
        self.scr_height = self.screen.get_rect().height
        self.bg_color = bg_color
        self.clock = pygame.time.Clock()
        self.funcs = funcs
        self.items = []
        for index, item in enumerate(items):
            menu_item = MenuItem(item, font, font_size, font_color)
            # t_h: total height of text block
            t_h = len(items) * menu_item.height
            pos_x = (self.scr_width / 2) - (menu_item.width / 2)
            pos_y = (self.scr_height / 2) - (t_h / 2) + (index * menu_item.height)
            menu_item.set_position(pos_x, pos_y)
            self.items.append(menu_item)
        self.mouse_is_visible = True
        self.cur_item = None
    def set_mouse_visibility(self):
        if self.mouse_is_visible:
            pygame.mouse.set_visible(True)
        else:
            pygame.mouse.set_visible(False)
    def set_keyboard_selection(self, key):
        """
        Marks the MenuItem chosen via up and down keys.
        """
        for item in self.items:
            # Return all to neutral
            item.set_italic(False)
            item.set_font_color(WHITE)
        if self.cur_item is None:
            self.cur_item = 0
        else:
            # Find the chosen item
            if key == pygame.K_UP and 
                    self.cur_item > 0:
                self.cur_item -= 1
            elif key == pygame.K_UP and 
                    self.cur_item == 0:
                self.cur_item = len(self.items) - 1
            elif key == pygame.K_DOWN and 
                    self.cur_item < len(self.items) - 1:
                self.cur_item += 1
            elif key == pygame.K_DOWN and 
                    self.cur_item == len(self.items) - 1:
                self.cur_item = 0
        self.items[self.cur_item].set_italic(True)
        self.items[self.cur_item].set_font_color(RED)
        # Finally check if Enter or Space is pressed
        if key == pygame.K_SPACE or key == pygame.K_RETURN:
            text = self.items[self.cur_item].text
            self.funcs[text]()
    def set_mouse_selection(self, item, mpos):
        """Marks the MenuItem the mouse cursor hovers on."""
        if item.is_mouse_selection(mpos):
            item.set_font_color(RED)
            item.set_italic(True)
        else:
            item.set_font_color(WHITE)
            item.set_italic(False)
    def run(self):
        mainloop = True
        while mainloop:
            # Limit frame speed to 50 FPS
            self.clock.tick(50)
            mpos = pygame.mouse.get_pos()
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    mainloop = False
                if event.type == pygame.KEYDOWN:
                    self.mouse_is_visible = False
                    self.set_keyboard_selection(event.key)
                if event.type == pygame.MOUSEBUTTONDOWN:
                    for item in self.items:
                        if item.is_mouse_selection(mpos):
                            self.funcs[item.text]()
            if pygame.mouse.get_rel() != (0, 0):
                self.mouse_is_visible = True
                self.cur_item = None
            self.set_mouse_visibility()
            # Redraw the background
            self.screen.fill(self.bg_color)
            for item in self.items:
                if self.mouse_is_visible:
                    self.set_mouse_selection(item, mpos)
                self.screen.blit(item.label, item.position)
            pygame.display.flip()
if __name__ == "__main__":
    # Creating the screen
    screen = pygame.display.set_mode((640, 480), 0, 32)
    menu_items = ('Start', 'Quit')
    funcs = {'Start': os.system("python game.py"),
             'Quit': sys.exit}
    pygame.display.set_caption('Badger Defense')
    gm = BadgerDefense(screen, funcs.keys(), funcs)
    gm.run()

Answer 1

不需要为菜单使用类，函数就可以了。例如:

def game_menu():
    menu = True
    while menu:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
        gameDisplay.fill(white)
        titleText = gameDisplay.blit(title, (170, 200))   # Title is an image
        titleText.center = ((display_width / 2), (display_height / 2))
        pygame.display.update()
        clock.tick(15)

，然后调用游戏循环上方的菜单