Pygame边界问题

因此，我已经开始从Youtube上的新波士顿学习PyGame，并且我有点卡在boundaries video上。Pygame边界问题

在录像中，在1:50，他的类型：

if lead_x > display_width or lead_x < 0 or lead_y > display_height or lead_y < 0: 
     gameExit = True

这台游戏中显示的边界。游戏在蛇经过它后退出。但是，当我做同样的事情时，它似乎对我的程序没有影响。蛇不停地播放节目。有什么我做错了吗？源代码如下。谢谢！

import pygame 

pygame.init() 

display_width = 800 
display_height = 600 

gameDisplay = pygame.display.set_mode((display_width,display_height)) 
pygame.display.set_caption('Snake') 

white = (255,255,255) 
black = (0,0,0) 
red = (255,0,0) 

pygame.display.update() 

gameExit = False 

lead_x = 300 
lead_y = 300 
lead_x_change = 0 
lead_y_change = 0 

clock = pygame.time.Clock() 

while not gameExit: 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      gameExit = True 
     if event.type == pygame.KEYDOWN: 
      if event.key == pygame.K_LEFT: 
       lead_x_change = -10 
       lead_y_change = 0 
      elif event.key == pygame.K_RIGHT: 
       lead_x_change = 10 
       lead_y_change = 0 
      elif event.key == pygame.K_UP: 
       lead_y_change = -10 
       lead_x_change = 0 
      elif event.key == pygame.K_DOWN: 
       lead_y_change = 10 
       lead_x_change = 0 
    if lead_x > display_width or lead_x < 0 or lead_y > display_height or lead_y < 0: 
     gameExit = True 

    lead_x += lead_x_change 
    lead_y += lead_y_change 
    gameDisplay.fill(white) 
    pygame.draw.rect(gameDisplay, black, [lead_x,lead_y,10,10]) 
    pygame.display.update() 
    clock.tick(15) 

pygame.quit() 
quit()

来源

2017-06-21 George Chan

我复制和粘贴代码，它的工作方式和预期的一样。我会使用'Rect'类而不是那种不方便的'if'语句，但是可能你想要一步一步地按照你的视频..... – sloth

其实用pygame测试你的代码后，它似乎工作正常。然而角色确实离开了屏幕。下面的代码将防止角色离开屏幕。

你需要检查lead_x & lead_y加入量移动（例如lead_x + lead_x_changed）改变的行：

if (lead_x + lead_x_change) > display_width or (lead_x + lead_x_change) < 0 or (lead_y + lead_y_change) > display_height or (lead_y + lead_y_change) < 0:

完整的示例：

lead_x = 300 
lead_y = 300 
lead_x_change = 0 
lead_y_change = 0 

clock = pygame.time.Clock() 
gameExit = False 

while not gameExit: 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      gameExit = True 
     if event.type == pygame.KEYDOWN: 
      if event.key == pygame.K_LEFT: 
       lead_x_change = -10 
       lead_y_change = 0 
      elif event.key == pygame.K_RIGHT: 
       lead_x_change = 10 
       lead_y_change = 0 
      elif event.key == pygame.K_UP: 
       lead_y_change = -10 
       lead_x_change = 0 
      elif event.key == pygame.K_DOWN: 
       lead_y_change = 10 
       lead_x_change = 0 


    lead_x += lead_x_change 
    lead_y += lead_y_change 
    gameDisplay.fill(white) 
    pygame.draw.rect(gameDisplay, black, [lead_x,lead_y,10,10]) 
    pygame.display.update() 
    clock.tick(15) 
    if (lead_x + lead_x_change) > display_width or (lead_x + lead_x_change) < 0 or (lead_y + lead_y_change) > display_height or (lead_y + lead_y_change) < 0: 
     gameExit = True 

pygame.quit() 
quit()

来源

2017-06-21 07:58:27 ChickenFeet

Pygame边界问题

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