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'''太空狙击（四）'''
import pygame
from pygame.locals import *
import random
# 初始化
pygame.init()

# 定义飞机类


class Plane(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        # 加载飞机图片
        self.image = pygame.image.load('img/img_plane.png')
        # 设置飞机初始位置
        self.rect = self.image.get_rect()
        # 设置飞机长方形中心的X的值
        self.rect.centerx = WIDTH / 2
        # 设置飞机长方形底边的值
        self.rect.bottom = HEIGHT - 10

    def update(self):
        # 初始化速度为 0
        self.speedx = 0
        # 获取按键状态
        keys = pygame.key.get_pressed()
        if keys[pygame.K_LEFT]:
            self.speedx = -8
        if keys[pygame.K_RIGHT]:
            self.speedx = 8
        # 根据速度改变飞机位置
        self.rect.centerx += self.speedx
        # 飞机左右移动限制
        if self.rect.right > WIDTH:
            self.rect.right = WIDTH
        if self.rect.left < 0:
            self.rect.left = 0
    def shoot(self):
        bullet = Bullet(self.rect.centerx,self.rect.top)
        all_sprites.add(bullet)
        all_bullets.add(bullet)





class Bullet(pygame.sprite.Sprite):
    def __init__(self,x,y):
        pygame.sprite.Sprite.__init__(self)
        # 加载飞机图片
        self.image = pygame.image.load('img/img_bullet.png')
        self.rect = self.image.get_rect()
        # 设置飞机初始位置
        self.rect.y = y
        # 设置飞机长方形中心的X的值
        self.rect.centerx = x
        # 设置飞机长方形底边的值
        self.speedy = -10

    def update(self):
        self.rect.y += self.speedy
        if self.rect.bottom < 0:
            self.喵()





# 定义屏幕宽，高
WIDTH = 480
HEIGHT = 600

# 创建屏幕
screen = pygame.display.set_mode((WIDTH, HEIGHT))
# 加载背景图片
bg = pygame.image.load('img/img_bg.jpg')
# 定义飞机
plane = Plane()
all_sprites = pygame.sprite.Group()
all_sprites.add(plane)
all_meteorite = pygame.sprite.Group()
all_bullets = pygame.sprite.Group()


class Meteorite(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load('img/img_meteorite.png')
        self.rect = self.image.get_rect()
        self.rect.x = random.randrange(WIDTH-self.rect.width)
        self.rect.y = random.randrange(-100, -40)
        self.speedy = random.randrange(1, 8)
        self.speedx = random.randrange(-3, 3)

    def update(self):
        self.rect.x += self.speedx
        self.rect.y += self.speedy

        if self.rect.top > HEIGHT + 10 or self.rect.left < -30 or self.rect.right > WIDTH + 30:
            self.rect.x = random.randrange(WIDTH - self.rect.width)
            self.rect.y = random.randrange(-100, -40)
all_meteorite = pygame.sprite.Group()            


for i in range(8):
    met = Meteorite()
    all_meteorite.add(met)
    all_sprites.add(met)


# 控制帧速率
clock = pygame.time.Clock()
# 帧速率为60，即每秒执行60次循环
FPS = 60

running = True
COLOR_WHITE = (255,255,255)
score = 0
font_name = pygame.font.match_font("黑体")
font = pygame.font.Font(font_name, 18)
text_surface = font.render(str(score),True,COLOR_WHITE)
text_rect = text_surface.get_rect()
text_rect.center =(WIDTH/2,10)
text_surface = font.render(str(score),True,COLOR_WHITE)

while running:
    # 控制帧速率也就是每秒内循环执行的次数
    clock.tick(FPS)
    # 调用飞机移动的方法
    # 绘制背景
    screen.blit(bg, (0, 0))
    all_sprites.update()
    all_sprites.draw(screen)
    # 绘制飞机
    text_surface = font.render(str(score), True, COLOR_WHITE)
    screen.blit(plane.image, plane.rect)
    # 重绘界面，相当于刷新
    screen.blit(text_surface,text_rect)
    
    pygame.display.flip()

    hits1 = pygame.sprite.spritecollide(plane,all_meteorite,True)
    if hits1:
        running = False

    hits2 = pygame.sprite.groupcollide(all_meteorite,all_bullets,True,True)
    for hit in hits2:
        score += 5
        meteorite = Meteorite()
        all_sprites.add(meteorite)
        all_meteorite.add(meteorite)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            # 点击叉号结束游戏
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                plane.shoot()

            if event.key == pygame.K_ESCAPE:
                # 按下ESC键结束游戏
                running = False

    def update(self):
        self.rect.x += self.speedx
        self.rect.y += self.speedy

# 彻底退出
pygame.quit()