更改pygam中单个不变精灵对象的速度

Question

我正在做一本书中的pygame程序，里面有一个厨师扔比萨饼，你必须用平底锅把它们抓起来。厨师和潘雪碧只创造了一次，而披萨雪碧显然一直在创造。我试着让分数越高时，厨师的动作就越快（只在x轴上移动）。我想我在类属性和实例属性方面遇到了麻烦。我一直找不到从chef类访问score的方法，尽管我尝试将score设置为一个全局变量，甚至只将其分配给一个虚拟的全局变量（这将允许我在update方法中更改chefs的速度）。或者，我尝试在pan类中访问chefs dx，因为这是分数所在。我也无法访问它，即使使用getattr方法。如有任何建议，不胜感激。这是pan和chef类的代码。我已经把我试过但没用的东西的一部分注释掉了。在

from livewires import games, color
import random

games.init(screen_width = 640, screen_height = 480, fps = 50)


class Pan(games.Sprite):
    """
    A pan controlled by player to catch falling pizzas.
    """
    image = games.load_image("pan.bmp")

    def __init__(self):
        """ Initialize Pan object and create Text object for score. """
        super(Pan, self).__init__(image = Pan.image,
                                  x = games.mouse.x,
                                  bottom = games.screen.height)


        self.score = games.Text(value = 0, size = 25, color = color.black,
                                top = 5, right = games.screen.width - 10)
        games.screen.add(self.score)

    def update(self):
        """ Move to mouse x position. """
        self.x = games.mouse.x

        if self.left < 0:
            self.left = 0

        if self.right > games.screen.width:
            self.right = games.screen.width

        self.check_catch()
    def check_catch(self):
        """ Check if catch pizzas. """
        for pizza in self.overlapping_sprites:
            self.score.value += 10

#increase the speed of the pizza

 #           if self.score.value % 100 == 0:
#             Pizza.speed += 0.1
     #           print(Pizza.speed)

#increase the speed of the chef


   #         if self.score.value % 100 == 0:
     #          print(Chef.dx)
      #         print(x)
       #        y = int(x)*2
        #       print(y)

            self.score.right = games.screen.width - 10 
            pizza.handle_caught()




class Chef(games.Sprite):
    """
    A chef which moves left and right, dropping pizzas.
    """
    image = games.load_image("chef.bmp")
    speed  = 2

    def __init__(self, y = 55, odds_change = 200):
        """ Initialize the Chef object. """
        super(Chef, self).__init__(image = Chef.image,
                                   x = games.screen.width / 2,
                                   y = y,
                                   dx = Chef.speed)

        self.odds_change = odds_change
        self.time_til_drop = 0

    def update(self):
        #x = getattr(Pan,"score")
        #print(x)
        """ Determine if direction needs to be reversed. """
        if self.left < 0 or self.right > games.screen.width:
            self.dx = -self.dx
        elif random.randrange(self.odds_change) == 0:
           self.dx = -self.dx       
        self.check_drop()


    def check_drop(self):
        """ Decrease countdown or drop pizza and reset countdown. """
        if self.time_til_drop > 0:
            self.time_til_drop -= 1
        else:
            new_pizza = Pizza(x = self.x)
            games.screen.add(new_pizza)

            # set buffer to approx 30% of pizza height, regardless of pizza speed   
            self.time_til_drop = int(new_pizza.height * 1.3 / Pizza.speed) + 1      


def main():
    """ Play the game. """
    wall_image = games.load_image("wall.jpg", transparent = False)
    games.screen.background = wall_image

    the_chef = Chef()
    games.screen.add(the_chef)

    the_pan = Pan()
    games.screen.add(the_pan)

    games.mouse.is_visible = False

    games.screen.event_grab = True
    games.screen.mainloop()

# start it up!
main()   

Answer 1

由于chef speed是一个类变量，因此需要添加类名才能访问它，如：Chef.speed。披萨课在哪里？我不知道Livewire，所以不能解释为什么你不能访问这个分数，但是你肯定可以把它设置成一个数字，然后用这种方式使用它？在

Answer 2

谢谢你的时间。我可以通过在Pan类中创建一个属性标志来检查分数，然后在Chef的update方法中访问该属性标志，从而能够更改dx。主厨速度只是初始厨师速度，因此更改它不会更新厨师的dx。在