import pygame
import sys
from pygame.locals import *

#初始化Python
pygame.init()

size=width,height=600,400
speed = [-2,1]
bg=(255,255,255)

clock = pygame.time.Clock()
#创建指定大小的窗口
screen=pygame.display.set_mode(size)
#设置窗口标题
pygame.display.set_caption('请多指教')

#加载图片
turtle=pygame.image.load('60.jpg')
#获得图像的位置矩形
position=turtle.get_rect()

r_head = pygame.transform.flip(turtle,True,False)
l_head = turtle

while True:
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            sys.exit()

        if event.type == KEYDOWN:
            if event.key == K_LEFT:
                turtle = l_head
                speed = [-1,0]
            if event.key == K_RIGHT:
                turtle = r_head
                speed = [1,0]
            if event.key == K_UP:
                speed = [0,-1]
            if event.key == K_DOWN:
                speed = [0,1]

    #移动图像
    position = position.move(speed)

    if position.left < 0 or position.right > width:
        #翻转图像
        turtle = pygame.transform.flip(turtle, True, False)
        #反方向移动
        speed[0] = -speed[0]


    if position.top < 0 or position.bottom > height:
        speed[1] = -speed[1]

    #填充背景
    screen.fill(bg)
    #更新图像
    screen.blit(turtle,position)
    #更新界面
    pygame.display.flip()
    #延迟10毫秒
    #pygame.time.delay(10)
    clock.tick(50)
