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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