python-pygame的触碰方法

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*- 
 3 # Author: ss
 4 
 5 import pygame
 6 import sys
 7 import random
 8 import math
 9 
10 
11 class Ball(pygame.sprite.Sprite):
12     def __init__(self, image, position, speed, bg_size):
13         pygame.sprite.Sprite.__init__(self)
14         self.image = pygame.image.load(image).convert_alpha()
15         self.rect = self.image.get_rect()
16         self.rect.left, self.rect.right = position
17         self.speed = speed
18         self.width, self.height = bg_size[0], bg_size[1]
19 
20     def move(self):
21         self.rect = self.rect.move(self.speed)
22 
23         if self.rect.right < 0:
24             self.rect.left = self.width
25         if self.rect.left > self.width:
26             self.rect.right = 0
27         if self.rect.bottom < 0:
28             self.rect.top = self.height
29         if self.rect.top > self.height:
30             self.rect.bottom = 0
31 
32 def collide_check(item,target):
33     col_balls = []
34     for each in target:
35         distance = math.sqrt(math.pow((item.rect.center[0] - each.rect.center[0]), 2) + \
36                              math.pow((item.rect.center[1] - each.rect.center[1]), 2))
37         if distance <= (item.rect.width + each.rect.width) / 2:
38             col_balls.append(each)
39     return col_balls
40 
41 
42 def main():
43     pygame.init()
44 
45     ball_image = 'gray_ball.png'
46     bg_image = 'background.png'
47 
48     bg_size = width, height = 1024, 681
49     screen = pygame.display.set_mode(bg_size)
50     pygame.display.set_caption('我的滚动的球 -s.s')
51     background = pygame.image.load(bg_image)#.convert_alpha
52 
53     balls = []
54 
55 
56     for i in range(5):
57         position = random.randint(0, width - 100), random.randint(0, height - 100)
58         speed = [random.randint(-10, 10), random.randint(-10, 10)]
59         ball = Ball(ball_image, position, speed, bg_size)
60         while collide_check(ball,balls):
61             ball.rect.left, ball.rect.right = random.randint(0, width - 100), random.randint(0, height - 100)
62         balls.append(ball)
63 
64 
65     clock = pygame.time.Clock()
66 
67     running = True
68 
69     while running:
70         for event in pygame.event.get():
71             if event.type == pygame.QUIT:
72                 sys.exit()
73 
74         screen.blit(background, (0, 0))
75 
76         for each in balls:
77             each.move()
78             screen.blit(each.image, each.rect)
79 
80         for i in range(5):
81             item = balls.pop(i)
82             if collide_check(item, balls):
83                 item.speed[0] = -item.speed[0]
84                 item.speed[1] = -item.speed[1]
85             balls.insert(i, item)
86 
87         pygame.display.flip()
88 
89         clock.tick(50)
90 
91 
92 if __name__ == "__main__":
93     main()