python-3.x - 为什么我的程序停止响应并崩溃？

Question

我只是想学习一些我即将进行的项目所需的 PyGame，所以我想知道为什么这段示例代码崩溃以及如何修复它。

我尝试在网上查找，但没有找到有效的解决方案。

import pygame

# Initialise pygame
pygame.init()
clock = pygame.time.Clock()
# pygame.font.init()
myFont = pygame.font.SysFont('Comic Sans MS', 30)

# Colours
BLACK = (0,   0,   0)
WHITE = (255, 255, 255)
BLUE  = (0,   0, 255)
GREEN = (0, 255,   0)
RED   = (255,   0,   0)

# Screen Size
size = [400, 300]
screen = pygame.display.set_mode(size)

# Initialise Variables
done = False

class Unit:
    def __init__(self, name, hp, attack):
        self.name = name
        self.hp = hp
        self.attack = attack

class Infantry(Unit):
    def __init__(self, name, hp, attack):
        super().__init__(name, hp, attack)

    def attack_turn(self):
        self.hp -= self.attack
        text_surface = myFont.render(self.name + " has " + str(self.hp) + " health points left!", True, (255, 0, 0))
        screen.blit(text_surface, (0, 0))
        # print(self.name + " has " + str(self.hp) + " health points left!")
        x = input("Press ENTER to continue!")

player = Infantry("Panzer", 110, 13)  # The attack set here is for the enemy.
enemy = Infantry("T-14", 100, 30)  # The attack set here is for the player.

while not done:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
    while player.hp > 0 and enemy.hp > 0:
        player.attack_turn()
        enemy.attack_turn()

    done = True

if player.hp > enemy.hp:
    # print(player.name + " wins!")
    text_surface = myFont.render(player.name + " wins!", False, (255, 0, 0))
    screen.blit(text_surface, (100, 100))
else:
    # print(enemy.name + " wins!")
    text_surface = myFont.render(enemy.name + " wins!", False, (255, 0, 0))
    screen.blit(text_surface, (100, 100))

我希望代码至少能够运行，这样我就可以在那里工作，但它甚至没有这样做。

Answer 1

不要在主循环内执行另一个循环。内部循环阻止了事件处理，摆脱它。在主循环结束时检查游戏是否已完成就足够了:

done = False
while not done:

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

    player.attack_turn()
    enemy.attack_turn()

    if player.hp <= 0 or enemy.hp <= 0:
        done = True

    pygame.display.flip()

input 没有执行您想要的操作，它不是游戏窗口的输入。删除它，并将 attack 方法拆分为计算新生命值的 on 方法和一个新方法 draw，该方法“blit”文本:

class Infantry(Unit):
    def __init__(self, name, hp, attack):
        super().__init__(name, hp, attack)

    def attack_turn(self):
        self.hp -= self.attack

        ### x = input("Press ENTER to continue!") <----- delete

    def draw(self):
        text_surface = myFont.render(self.name + " has " + str(self.hp) + " health points left!", True, (255, 0, 0))
        screen.blit(text_surface, (0, 0))

使用pygame.KEYUP事件来检查pygame.K_RETURN键是否被按下。
在主循环结束时进一步进行所有绘图。使用pygame.Surface.fill用单一颜色填充屏幕(清除屏幕)。然后绘制文字。最后使用pygame.display.flip()更新完整显示:

例如

done = False
count = 0
while not done:

    attack = False
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RETURN:
                attack = True

    if attack:
        if count % 2 == 0:
            player.attack_turn()
        else:
            enemy.attack_turn()
        count += 1

    if player.hp <= 0 or enemy.hp <= 0:
        done = True

    screen.fill(BLACK)
    if count % 2 == 0:
        player.draw()
    else:
        enemy.draw()
    pygame.display.flip()