import pygame
from pygame import locals

pygame.init()   # 初始化
# 创建窗口
screen = pygame.display.set_mode((640, 480))
# 载入图片、资源
bg_img = pygame.image.load('background.png')  # 背景图
play_img = pygame.image.load('play.png')  # 播放按钮
stop_img = pygame.image.load('stop.png')  # 暂停按钮
last_img = pygame.image.load('last.png')  # 上一曲按钮
next_img = pygame.image.load('next.png')  # 下一曲按钮
logo_img = pygame.image.load('logo.png')  # 中间logo
pygame.mixer.music.load('歌曲4.ogg')
volume=0
click=0
button_img = stop_img
while True:
    for event in pygame.event.get():
        if event.type==locals.QUIT:
            exit()
        if event.type==locals.KEYUP: 
            if event.key==locals.K_DOWN:
                volume-=0.1
                if volume<0:
                    volume=0
                pygame.mixer.music.set_volume(volume)
        if event.type==locals.KEYDOWN: 
            if event.key==locals.K_UP:
                volume+=0.1
                if volume>1:
                    volume=1
                pygame.mixer.music.set_volume(volume)
        if event.type==locals.MOUSEBUTTONDOWN:
            click+=1
            if click%2==0:
                button_img = stop_img
                pygame.mixer.music.unpause()
            else:
                button_img = play_img
                pygame.mixer.music.pause()
    if pygame.mixer.music.get_busy()==False:
        pygame.mixer.music.play()
    
    # 绘制画面
    screen.blit(bg_img, (0, 0))      # 填充背景
    screen.blit(button_img, (270, 330))   # 暂停按钮
    screen.blit(logo_img, (170, 60))    # 中间logo图
    screen.blit(last_img, (120, 350))   # 上一曲
    screen.blit(next_img, (420, 350))   # 下一曲
    # 刷新画面
    pygame.display.update()