[已解决]今天的第二贴，pygame写游戏，图片在背景上移动会留下拖痕是什么原因呢

库库的斯蒂芬

1. import pygame
   
2. import sys
   
3. from pygame.locals import *
   
4. from random import *
   
5. 
   
6. class Ball(pygame.sprite.Sprite):
   
7.     def __init__(self,image,position,speed):
   
8.         pygame.sprite.Sprite.__init__(self)
   
9.         self.image=pygame.image.load(image).convert_alpha()
   
10.         self.rect=self.image.get_rect()
    
11.         self.rect.left, self.rect.top=position
    
12.         self.speed=speed
    
13. 
    
14.     def move(self):
    
15.         self.rect=self.rect.move(self.speed)
    
16. 
    
17. def main():
    
18.     pygame.init()
    
19.     ball_img='ball.png'
    
20.     bg_img='bg.png'
    
21. 
    
22.     running=True
    
23. 
    
24.     bg_size=width,height=1357,637
    
25.     screen=pygame.display.set_mode(bg_size)
    
26.     pygame.display.set_caption('play the ball')
    
27. 
    
28.     bg=pygame.image.load(bg_img).convert_alpha()
    
29. 
    
30.     balls=[]
    
31. 
    
32.     for i in range(3):
    
33.         position=randint(0, width-100),randint(0,height-100)
    
34.         speed=randint(-10, 10),randint(-10, 10)
    
35.         ball=Ball(ball_img, position, speed)
    
36.         balls.append(ball)
    
37. 
    
38.     clock=pygame.time.Clock()
    
39.     while running:
    
40.         for event in pygame.event.get():
    
41.             if event.type ==QUIT:
    
42.                 sys.exit()
    
43.         
    
44.         screen.blit(bg, (0,0))
    
45. 
    
46.         for each in balls:
    
47.             each.image=pygame.transform.smoothscale(each.image, (each.rect.width*0.5,each.rect.height*0.5))
    
48.             each.move()
    
49.             screen.blit(each.image, each.rect)
    
50. 
    
51.         pygame.display.flip()
    
52.         clock.tick(30)
    
53. 
    
54. if __name__ =="__main__":
    
55.     main()

复制代码

最佳答案

月排行榜 / 总排行榜

Twilight6

2022-5-11 17:31:19

将你的代码 28 行改成     bg = pygame.image.load(bg_img).convert()，参考代码：

1. import pygame
   
2. import sys
   
3. from pygame.locals import *
   
4. from random import *
   
5. 
   
6. 
   
7. class Ball(pygame.sprite.Sprite):
   
8.     def __init__(self, image, position, speed):
   
9.         pygame.sprite.Sprite.__init__(self)
   
10.         self.image = pygame.image.load(image).convert_alpha()
    
11.         self.rect = self.image.get_rect()
    
12.         self.rect.left, self.rect.top = position
    
13.         self.speed = speed
    
14. 
    
15.     def move(self):
    
16.         self.rect = self.rect.move(self.speed)
    
17. 
    
18. 
    
19. def main():
    
20.     pygame.init()
    
21.     ball_img = 'ball.png'
    
22.     bg_img = 'bg.png'
    
23. 
    
24.     running = True
    
25. 
    
26.     bg_size = width, height = 1357, 637
    
27.     screen = pygame.display.set_mode(bg_size)
    
28.     pygame.display.set_caption('play the ball')
    
29. 
    
30.     bg = pygame.image.load(bg_img).convert()
    
31. 
    
32.     balls = []
    
33. 
    
34.     for i in range(3):
    
35.         position = randint(0, width - 100), randint(0, height - 100)
    
36.         speed = randint(-10, 10), randint(-10, 10)
    
37.         ball = Ball(ball_img, position, speed)
    
38.         balls.append(ball)
    
39. 
    
40.     clock = pygame.time.Clock()
    
41.     while running:
    
42.         for event in pygame.event.get():
    
43.             if event.type == QUIT:
    
44.                 sys.exit()
    
45. 
    
46.         screen.blit(bg, (0, 0))
    
47. 
    
48.         for each in balls:
    
49.             each.image = pygame.transform.smoothscale(each.image, (each.rect.width * 0.5, each.rect.height * 0.5))
    
50.             each.move()
    
51.             screen.blit(each.image, each.rect)
    
52. 
    
53.         pygame.display.flip()
    
54.         clock.tick(30)
    
55. 
    
56. 
    
57. if __name__ == "__main__":
    
58.     main()

复制代码

跳转到最佳答案楼层

Twilight6

将你的代码 28 行改成     bg = pygame.image.load(bg_img).convert()，参考代码：

1. import pygame
   
2. import sys
   
3. from pygame.locals import *
   
4. from random import *
   
5. 
   
6. 
   
7. class Ball(pygame.sprite.Sprite):
   
8.     def __init__(self, image, position, speed):
   
9.         pygame.sprite.Sprite.__init__(self)
   
10.         self.image = pygame.image.load(image).convert_alpha()
    
11.         self.rect = self.image.get_rect()
    
12.         self.rect.left, self.rect.top = position
    
13.         self.speed = speed
    
14. 
    
15.     def move(self):
    
16.         self.rect = self.rect.move(self.speed)
    
17. 
    
18. 
    
19. def main():
    
20.     pygame.init()
    
21.     ball_img = 'ball.png'
    
22.     bg_img = 'bg.png'
    
23. 
    
24.     running = True
    
25. 
    
26.     bg_size = width, height = 1357, 637
    
27.     screen = pygame.display.set_mode(bg_size)
    
28.     pygame.display.set_caption('play the ball')
    
29. 
    
30.     bg = pygame.image.load(bg_img).convert()
    
31. 
    
32.     balls = []
    
33. 
    
34.     for i in range(3):
    
35.         position = randint(0, width - 100), randint(0, height - 100)
    
36.         speed = randint(-10, 10), randint(-10, 10)
    
37.         ball = Ball(ball_img, position, speed)
    
38.         balls.append(ball)
    
39. 
    
40.     clock = pygame.time.Clock()
    
41.     while running:
    
42.         for event in pygame.event.get():
    
43.             if event.type == QUIT:
    
44.                 sys.exit()
    
45. 
    
46.         screen.blit(bg, (0, 0))
    
47. 
    
48.         for each in balls:
    
49.             each.image = pygame.transform.smoothscale(each.image, (each.rect.width * 0.5, each.rect.height * 0.5))
    
50.             each.move()
    
51.             screen.blit(each.image, each.rect)
    
52. 
    
53.         pygame.display.flip()
    
54.         clock.tick(30)
    
55. 
    
56. 
    
57. if __name__ == "__main__":
    
58.     main()

复制代码