import pygame as pg
import sys,random

pg.init() #初始化
pg.display.set_caption("飞翔的小鸟")#设置标题
width,height = 700,500
win = pg.display.set_mode((width,height))

bg = pg.image.load("./img/bg_day.png").convert() #导入背景图片
bg = pg.transform.smoothscale(bg,(width,height)) # 设置背景图片的尺寸成窗口大小
font36 = pg.font.SysFont("楷书",36) # 设置游戏内文字的字体和大小
clock = pg.time.Clock() # 开启时钟设置
running = False # 设置监控变量，默认游戏没有运行
high_score = current_score = 0 # 最高分和当前游戏得分两个变量初始化为0
msg = font36.render("按空格开始游戏",1,(0,0,0))

bird_images = [] #定义用来储存小鸟图片的列表
for i in range(3):
    img = pg.image.load(f"./img/bird0_{i}.png").convert_alpha()
    bird_images.append(img)

class Bird(pg.sprite.Sprite):
    def __init__(self,images):
        pg.sprite.Sprite.__init__(self)
        self.images = images
        self.image = images[0]
        self.rect = self.image.get_rect() # 尺寸设置
        self.rect.topleft = 150,300 # 位置设置
        self.speed = 0 # 速度设置
        self.frame = 0
    def update(self):
        self.speed+= 0.5
        self.rect.y += self.speed
        self.frame += 1
        if self.frame>2:
            self.frame=0
        self.image = self.images[self.frame]
bird = Bird(bird_images)
while  True :
    win.blit(bg,(0,0))
    for event in pg.event.get():
        if event.type == pg.QUIT:
            pg.quit()
            sys.exit()
        if event.type == pg.KEYDOWN and event.key == pg.K_SPACE:
            running = True
            bird = Bird(bird_images)
        else:
            bird.speed = -8
    
    if running:
        bird.update()
        win.blit(bird.image,bird.rect)
    else :
        win.blit(msg,(200,200))
    clock.tick(60)
    pg.display.flip()