为什么";游戏结束";文本未显示

Question

我目前正在尝试对一个小游戏进行编程。敌人应该追逐玩家，但实际的追逐尚未实现。我仍然需要弄清楚如何做到这一点，但这不是问题所在。我这样做是为了让玩家在与敌人发生碰撞时回到起点。除此之外，还会出现一个文本"游戏结束"。该函数在游戏循环结束时调用，虽然文本出现得很短暂(实际上只出现过一次，我已经尝试过多次(，但它并没有停留。我打算让它出现，然后在几秒钟后消失，这样玩家就可以再次玩了，但我不知道为什么它会立即消失。如果这是错误的地方发布这个，请告诉我，我会删除这个帖子。这是我的代码，如果有人能帮我，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, 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,(x,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)) + (math.pow(playerY - enemyY,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, playerY, enemyX, enemyY)
if collision:
playerY = 480
game_over_text()
player(playerX, playerY)
enemy(enemyX, enemyY)
pygame.display.update()

Answer 1

碰撞只发生一瞬间，只有当对象碰撞时，才会显示文本上的游戏。如果要保留文本，请在检测到冲突时设置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，根据对象的位置，在每个帧中设置collision。然而，gameover在发生冲突时被设置一次，然后保持其状态。