import pygame
from pygame import locals
import random

pygame.init()  # 初始化

class Block(pygame.sprite.Sprite):
    def __init__(self,image1,image2,image3):
        super().__init__()
        # 加载障碍物的图片
        self.image = random.choice([image1, image2, image3])
        # 根据障碍物位图的宽高设置矩形
        self.rect = self.image.get_rect()
        # 障碍物绘制坐标
        self.rect.x = 1000
        self.rect.y = 500 - self.rect.height

# 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）
pygame.display.set_caption("悟空酷跑")
# 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
bush = 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   
y = 400
jumpState = "runing"
t = 30

bg_x = 0
road_x = 0

# 创建障碍物
obstacle = Block(bush,cacti,stone)

while True:
    for event in pygame.event.get():
        if event.type == locals.QUIT:
            # 接收到退出事件后退出程序
            exit()
        if event.type == locals.KEYDOWN:
            if jumpState == "runing":
                if event.key == locals.K_SPACE:
                    jumpState = "up"

    if jumpState == "up":    # 起跳状态
        if t > 0:
            y -= t
            t -= 2
        else:
            jumpState = "down"  
    if jumpState == "down":    # 降落状态
        if t <= 30:
            y += t
            t += 2
        else:
            jumpState = "runing"
            t =30
    
    # 悟空造型
    wukong = hero[index]
    if jumpState == "runing":       # 跑步状态下
        index += 1
        if index >= 5:
            index = 0
    # 将背景图画上去
    bg_x -= 1
    if bg_x<=-1000:
        bg_x = 0
    screen.blit(background, (bg_x, 0))
    road_x -= 8
    if road_x<=-1000:
        road_x = 0
    screen.blit(road, (road_x, 500))
    screen.blit(wukong, (150, y))     # 悟空

# ++++++++++++++++++++++
    if obstacle.rect.x <= 0-obstacle.rect.width:
        obstacle = Block(bush,cacti,stone)
    obstacle.rect.x -= 8
# ++++++++++++++++++++++
    screen.blit(obstacle.image, (obstacle.rect.x, obstacle.rect.y)) 
    # 刷新画面
    pygame.display.update()
    FPS.tick(60)