为什么不出现“游戏结束”文本？

如何解决为什么不出现“游戏结束”文本？

我目前正在尝试编写一个小游戏。敌人应该追逐玩家，实际追逐尚未实现。我仍然需要弄清楚如何做到这一点，但这不是问题。我已经做到了，一旦与敌人发生碰撞，玩家就会返回起点。除此之外，应该会出现一个文本“游戏结束”。在游戏循环结束时调用该函数，虽然文本出现短暂（实际上只出现一次，我已经尝试过多次），但它不会停留。我打算让它出现，然后在几秒钟后消失，以便玩家可以再次播放，但我不确定为什么它会立即消失。如果发错地方了，请告诉我，我会删除这个帖子。这是我的代码，如果有人能帮助我，那就太棒了：

import pygame #imports pygame
import math
pygame.init()
#screen
screen = pygame.display.set_mode((800,600)) #width and height

#title and icon
pygame.display.set_caption("The Great Chase") #changes title
icon = pygame.image.load('game-controller.png')
pygame.display.set_icon(icon) #setting icon

#player
playerImg = pygame.image.load('scary-monster.png')
playerX = 370
playerY = 480
playerX_change = 0
playerY_change = 0

#enemy
enemyImg = pygame.image.load('caterpillar.png')
enemyX = 370
enemyY = 50
enemyX_change = 0
enemyY_change = 0

#GAME OVER
game_over_font = pygame.font.Font('Bubblegum.ttf',64)

def game_over_text():
    game_over_text = game_over_font.render("GAME OVER",True,(255,0))
    screen.blit(game_over_text,(200,250))

def player(x,y): #function for player
    screen.blit(playerImg,(x,y)) #draws image of player,blit -> means to draw

def enemy(x,y): #function for enemy
    screen.blit(enemyImg,y))

def isCollision(playerX,playerY,enemyX,enemyY):
    distance = math.sqrt((math.pow(playerX-enemyX,2)) + (math.pow(playerY - enemyY,2)))
    if distance < 25:
        return True
    else:
        return False

def chase():
    distance = math.sqrt((math.pow(playerX-enemyX,2)))

#Game loop
running = True
while running:
    screen.fill((255,255,0)) #0-255 RGB-> red,green & blue

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
           running = False
        # if keystroke check whether right or left or up or down
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                playerX_change = -0.2
            if event.key == pygame.K_RIGHT:
                playerX_change = 0.2
            if event.key == pygame.K_UP:
                playerY_change = -0.2
            if event.key == pygame.K_DOWN:
                playerY_change = 0.2
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                playerX_change = 0
            if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                playerY_change = 0

    playerX += playerX_change
    playerY += playerY_change

    #creating borders so that player won't leave screen
    if playerX <=0:
        playerX = 0
    elif playerX >=768:
        playerX = 768
    if playerY <= 0:
        playerY = 0
    elif playerY >=568:
        playerY = 568

    #collision
    collision = isCollision(playerX,enemyY)
    if collision:
        playerY = 480
        game_over_text()

    player(playerX,playerY)
    enemy(enemyX,enemyY)
    pygame.display.update()

解决方法

碰撞仅发生片刻，游戏结束文本仅在对象碰撞时显示。如果要保留文本，请在检测到碰撞时设置 gameover 变量并根据变量的状态显示文本：

gameover = False
running = True
while running:
    # [...]

    collision = isCollision(playerX,playerY,enemyX,enemyY)
    if collision:
        playerY = 480
        gameover = True

    player(playerX,playerY)
    enemy(enemyX,enemyY)

    if gameover:
        game_over_text()

    pygame.display.update()

注意，collision 根据对象的位置在每一帧中设置。但是，gameover 在发生碰撞时设置一次，然后保持其状态。