2018-09-04homework

一个球的动画

import pygame
from random import randint
if __name__ == '__main__':
    # 初始化，创建窗口
    pygame.init()
    window = pygame.display.set_mode((400,600))
    window.fill((255,255,255))





  # c.展示内容(将纸贴在画框上）
    pygame.display.flip()

    # 圆心坐标
    x = 100
    y = 100
    r = 50
    add = 4
    m = 2
    n = 1
    # 游戏循环
    while True:

        pygame.time.delay(5)
        # 将之前window上的内容覆盖了
        window.fill((255,255,255))

        # 不断的画圆
        pygame.draw.circle(window,(randint(0,255),randint(0,255),randint(0,255)),(x,y),r)
        pygame.display.update()

        # 改变y值让圆在垂直方向移动
        y += m
        x += n
        # r += add
        # if r >=600 or r <= 20 :
        #     add *= -1
        if y >= 600 - r or y <= 50:
            m *= -1
        elif x >= 400-r or x <= 50:
            n *= -1

        # 事件检测
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()