import pygame
from pygame import locals

pygame.init()  # 初始化
# 创建一个窗口
screen = pygame.display.set_mode((1000, 600))
FPS = pygame.time.Clock()  # pygame时钟，控制游戏速度（帧数）
# 载入图片
background = pygame.image.load('bg.png')    # 背景
road = pygame.image.load('road.png')      # 路
stone = pygame.image.load('stone.png')      # 石头
cacti = pygame.image.load('cacti.png')      # 仙人掌
apple = pygame.image.load('bush.png')      # 灌木丛
hero = [pygame.image.load('hero1.png'),
pygame.image.load('hero2.png'), 
pygame.image.load('hero3.png'),
pygame.image.load('hero4.png'),
pygame.image.load('hero5.png')]
index = 0 
herol=len(hero)
y=400 
state="running"
t=30
while True:
    for event in pygame.event.get():
        if event.type == locals.QUIT:
            exit()
        if event.type == locals.KEYDOWN:
            if event.key==locals.K_SPACE and state=="running":
                state="up"
    if state == "up":
        if t >0:
            y -=t
            t -= 2
        else:
            state="donw"
    if state =="donw":
        if t <=30:
            y+=t
            t+=2
        else:
            state="running"
            t -= 2
        
               # 接收到退出事件后退出程序


    # 将背景图画上去
    screen.blit(background, (0, 0))
    screen.blit(road, (0, 500))
    screen.blit(hero[index], (150, y))
    if state=="running":
        index+=1
        if index>4:
            index=0
    # 刷新画面
    pygame.display.update()
    FPS.tick(60)