import datetime
from turtle import *

bgpic("China.png")
setup(1200,800)
tracer(False)#画笔不刷新

h=Pen()
m=Pen()
s=Pen()
h.pensize(5)
m.pensize(3)
s.pensize(2)

p=Pen()
p.ht()
p.penup()
p.goto(-220,-345)

t = datetime.datetime.now()
cha=datetime.timedelta(hours=0)

def change(x,y):
    # print(x,y)
    global cha
    if -495<x<-320 and 225<y<342:
        cha = datetime.timedelta(hours=0)
        bgpic("China.png")
    elif -225<x<-50 and 225<y<342:
        cha = datetime.timedelta(hours=-5)
        bgpic("Russia.png")
    elif 45<x<222 and 225<y<342:
        cha = datetime.timedelta(hours=-7)
        bgpic("Britain.png")
    elif 318<x<492 and 225<y<342:
        cha = datetime.timedelta(hours=-12)
        bgpic("America.png")

listen()
onscreenclick(change)

while True:
    t = datetime.datetime.now()
    t+=cha

    s.clear()
    m.clear()
    h.clear()
    p.clear()
    s.home()
    m.home()
    h.home()

    s.seth(-t.second*6+90)
    s.fd(120)
    m.seth(-t.minute*6+90)
    m.fd(80)
    h.seth(-t.hour%12*30- t.minute/12*6+90)
    h.fd(40)

    p.write("{}年{}月{}日 {}:{}:{}".format(t.year,t.month,t.day,t.hour,t.minute,t.second,), font=("黑体", 30, 'bold'))
    update()