如何制作边界，以使DVD徽标不会脱离屏幕？

Question

我试图建立一个边界，但它不起作用，所以我删除了它，但是现在它不想工作。它是带有图像的代码，并使用键将其移动。我是编码的初学者，所以我不知道太多，因此我很感谢我应该做些什么编辑或建议。

这是我的代码：

#Imports Pygame module
import pygame

#Initializing/ Starting Pygame module
pygame.init()

#Setting the  background and starting location of logo
dvdLogoSpeed = [1, 1]
backgroundColor = 0, 0, 0

#Screen size display variable
screen = pygame.display.set_mode(600, 600)

#Variable for logo and made rectangle for logo
dvdLogo = pygame.image.load("dvd-logo-white.png")
dvdLogoRect = dvdLogo.get_rect()

#Variables
x = 200
y = 200
vel = 10
width = 20
height = 20

def dvdwKeys ():
  
  run = True
  
  while run == True:
    
    pygame.time.delay(10)
        
    for event in pygame.event.get():
            
      if event.type == pygame.QUIT:
                
        run = False
        
    screen.fill (backgroundColor)
    screen.blit(dvdLogo, dvdLogoRect)
    
    keys = pygame.key.get_pressed()
    
    if keys[pygame.K_LEFT] and x>0:
            
      dvdLogoRect.x -= vel
            
    if keys[pygame.K_RIGHT] and x<600-width:
            
      dvdLogoRect.x += vel
           
    if keys[pygame.K_UP] and y>0:
            
      dvdLogoRect.y -= vel
            
    if keys[pygame.K_DOWN] and y<600-height:
      
      dvdLogoRect.y += vel
  
    pygame.display.flip()

dvdwKeys()

Answer 1

您需要测试dvdlogorect.x和dvdlogorect.y而不是x和y：

while run == True:
    # [...]

    if keys[pygame.K_LEFT] and dvdLogoRect.x>0:
      dvdLogoRect.x -= vel
            
    if keys[pygame.K_RIGHT] and dvdLogoRect.right<600:
      dvdLogoRect.x += vel
           
    if keys[pygame.K_UP] and dvdLogoRect.y>0:          
      dvdLogoRect.y -= vel
            
    if keys[pygame.K_DOWN] and dvdLogoRect.bottom<600:
      dvdLogoRect.y += vel

但是，您可以简化带有 pygame.Rect.clamp_ip.clamp_ip ：

def dvdwKeys ():
    clock = pygame.time.Clock() 
    run = True
    while run == True:
        clock.tick(100)    
        for event in pygame.event.get():    
            if event.type == pygame.QUIT:       
                run = False

    keys = pygame.key.get_pressed()
    dvdLogoRect.x += (keys[pygame.K_RIGHT] - keys[pygame.K_LEFT]) * vel
    dvdLogoRect.y += (keys[pygame.K_DOWN] - keys[pygame.K_UP]) * vel

    dvdLogoRect.clamp_ip(screen.get_rect())
        
    screen.fill(backgroundColor)
    screen.blit(dvdLogo, dvdLogoRect)
    pygame.display.flip()

另请参阅我的精灵的边界和当钥匙按住时，我该如何进行精灵移动和