Question

我现在正在尝试制作一款迷你游戏，让用户躲避所有落下的比萨饼。然而，在比萨饼触摸图形屏幕的底部后，用户的分数会无限增加，我不知道为什么会这样。请帮我解决这个问题。

from livewires import games, color
import random

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

class Pizza(games.Sprite):
    image = games.load_image("pizza.bmp")
    speed = 2
    pizza_count = 0

    def __init__(self, x, top):
        super(Pizza, self).__init__(image = Pizza.image, x = x,
                                    top = top, dy = Pizza.speed)

    def update(self):
        if self.bottom > games.screen.height:
            Pizza.pizza_count += 1
            self.destroy()

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

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

    def end_game(self):
        end_message = games.Message(value = "Game Over!",
                                    size = 80,
                                    x = games.screen.width/2,
                                    y = games.screen.height/2,
                                    color = color.red,
                                    after_death = games.screen.quit,
                                    lifetime = 5 * games.screen.fps)
        games.screen.add(end_message)


class Runner(games.Sprite):

    image = games.load_image("chef.bmp")
    score = games.Text(value = 0, size = 50, color = color.black,
                       top = 50, right = games.screen.width - 10)

    def __init__(self, x = games.screen.width/2, bottom = games.screen.height):
        super(Runner, self).__init__(image = Runner.image,
                                      x = x, bottom = bottom)
        games.screen.add(Runner.score)
        self.pizza_x = random.randrange(games.screen.width)

        pizza = Pizza(x = self.pizza_x, top = 0)
        games.screen.add(pizza)

    def update(self):
        if games.keyboard.is_pressed(games.K_LEFT):
            self.x -= 3

        if games.keyboard.is_pressed(games.K_RIGHT):
            self.x += 3

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

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

        for pizza in self.overlapping_sprites:
            pizza.destroy()
            pizza.end_game()

        Runner.score.value += Pizza.pizza_count * 10
        Runner.score.right = games.screen.width - 10
        games.screen.add(Runner.score)






def main():
    background_image = games.load_image("wall.jpg", transparent = False)
    games.screen.background = background_image

    runner = Runner()
    games.screen.add(runner)
    games.screen.mainloop()

main()

Answer 1

只要没有对它的引用，垃圾收集器就会删除实例，所以仍然必须引用它...这里;

pizza = Pizza(x = self.pizza_x, top = 0) # pizza is still referring to it!
games.screen.add(pizza)

尝试放置＆＃39; pizza = None＆＃39;在＆＃39; games.screen.add（披萨）＆＃39;线。如果一切顺利，self.destroy（）函数应该删除最后一个引用并具有预期的效果。

使用一个标志来指示已经进行评分也是一个好主意，以防万一垃圾收集器的速度不足以移除实例..

def __init__(self, x, top):
    super(Pizza, self).__init__(image = Pizza.image, x = x,
                                top = top, dy = Pizza.speed)
    self.scoreFlag = False

def update(self):
    if self.bottom > games.screen.height:
        if self.scoreFlag == False:
            Pizza.pizza_count += 1
            self.scoreFlag = True
        self.destroy()
            self.destroy()

当Sprite对象被销毁时，我不知道为什么得分会不断增加？

1 个答案: