Python使用Turtle库绘制动态时钟完整代码解析

from turtle import *
from datetime import *
#移动到指定位置
def skip(step):
  penup()
  forward(step)
  pendown()
#画指针
def drawpointer(name, length):
  reset()
  skip(-length*0.1)
  begin_poly()
  forward(length*1.1)
  end_poly()
  handForm = get_poly()
  register_shape(name, handForm)
#初始化
def init():
  global hrpointer, minpointer, secpointer, weektext
  #设置turtle Logo模式，朝北
  mode("logo")
  drawpointer("hrpointer", 90)
  drawpointer("minpointer", 130)
  drawpointer("secpointer", 140)
  hrpointer = Turtle()
  hrpointer.shape("hrpointer")
  minpointer = Turtle()
  minpointer.shape("minpointer")
  secpointer = Turtle()
  secpointer.shape("secpointer")
  secpointer.pencolor("red")
  for pointer in hrpointer, minpointer, secpointer:
    pointer.shapesize(3, 1, 1)
    pointer.speed(0)
  #文字输出
  weektext = Turtle()
  weektext.hideturtle()
  weektext.penup()
#设置表盘形状
def setupClock(radius):
  reset()
#  clockPanel = Turtle()
  pensize(7)
  pencolor("blue")
  for i in range(60):
    skip(radius)
    if i%5 == 0:
      forward(20)
      skip(-radius-20)
    else:
      dot(5)
      skip(-radius)
    right(6)

#星期文本
def Week(t):
  week = ["星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"]
  return week[t.weekday()]
#日期文本
def Date(t):
  y = t.year
  m = t.month
  d = t.day
  return "%s %d %d" % (y, m, d)
#绘制表针动态显示
def tick():
  t = datetime.today()
  second = t.second + t.microsecond*0.0000001
  minute = t.minute + second/60.0
  hour = t.hour + minute/60.0
  secpointer.setheading(6*second)
  minpointer.setheading(6*minute)
  hrpointer.setheading(30*hour)
  tracer(False)
  weektext.forward(65)
  weektext.write(Week(t), align="center",font=("Courier", 14, "bold"))
  weektext.back(130)
  weektext.write(Date(t), align="center",font=("Courier", 14, "bold"))
  weektext.home()
  tracer(True)
  #间隔100ms调用一次
  ontimer(tick, 100)

def main():
  tracer(False)
  init()
  setupClock(160)
  tracer(True)
  tick()
  mainloop()
if __name__ == '__main__':
  main()