分享一个pygame 弹力球的实现实例

期望：

1.球体接触到框体后反弹

2.设置速度按键，按下后改变球体速度、颜色状态

具体实现：

 1 import pygame 2 
 from pygame.locals import * 3 
 import sys, random 4  5  6 class Circle(object): 7     
 #   设置Circle类属性 8     def __init__(self): 9         
 self.vel_x = 110         self.vel_y = 111         
 self.radius = 2012         
 self.pos_x, self.pos_y = random.randint(0, 255), random.randint(0, 255)13         
 self.width = 014         self.color = 0, 0, 015 16     
 #   球体颜色速度改变方法17     def change_circle(self, number):18         
 self.color = random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)19         
 #   防止球体速度方向发生改变20         if self.vel_x < 0:21             
 self.vel_x = -number22         else:23             self.vel_x = number24         
 if self.vel_y < 0:25             self.vel_y = -number26         else:27             
 self.vel_y = number28         
 #   self.vel_x, self.vel_y = number, number  如果仅此句，速度方向会发生改变   
 def circle_run(self):31         #   防止球体超出游戏界面框体32         
 if self.pos_x > 580 or self.pos_x < 20:33             self.vel_x = -self.vel_x    
 if self.pos_y > 480 or self.pos_y < 20:36             self.vel_y = -self.vel_y37         
 self.pos_x += self.vel_x38         self.pos_y += self.vel_y39         
 pos = self.pos_x, self.pos_y40         
 ygame.draw.circle(screen, self.color, pos, self.radius, self.width)41 42 pygame.init()43 
 screen = pygame.display.set_mode((600, 500))44 
 #   Circle实例45 circle1 = Circle()46 47 while True:48     
 for event in pygame.event.get():49         if event.type == QUIT:50             
 sys.exit()51         elif event.type == KEYUP:52             
 if event.key == pygame.K_1:53                 
 circle1.change_circle(1)54             
 elif event.key == pygame.K_2:55                 
 circle1.change_circle(2)56             
 elif event.key == pygame.K_3:57                 
 circle1.change_circle(3)58             
 elif event.key == pygame.K_4:59                 
 circle1.change_circle(4)60 61     
 screen.fill((0, 0, 100))62 63     
 circle1.circle_run()64 65     
 pygame.display.update()

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