python使用Turtle库绘制动态钟表
Python函数库众多,而且在不断更新,所以学习这些函数库最有效的方法,就是阅读Python官方文档。同时借助Google和百度。
本文介绍的turtle库对应的官方文档地址
绘制动态钟表的基本思路如下(面向对象的编程):
使用5个turtle对象
1个turtle:绘制外表盘
3个turtle:模拟表针行为
1个turtle:输出表盘上文字
根据实时时间使用ontimer()函数更新表盘画面,显示效果如下:
相关函数的使用在程序中进行了详细的注释,代码如下:
from turtle import *
from datetime import *
def Skip(step):
penup()
forward(step)
pendown()
def mkHand(name, length):
#注册Turtle形状,建立表针Turtle
reset() #清空当前窗口,并重置位置等信息为默认值
Skip(-length*0.1)
begin_poly()
forward(length*1.1)
end_poly()
handForm = get_poly()
register_shape(name, handForm)
def Init():
global secHand, minHand, hurHand, printer
mode("logo")# 重置Turtle指向北
#建立三个表针Turtle并初始化
mkHand("secHand", 135)
mkHand("minHand", 110)
mkHand("hurHand", 90)
secHand = Turtle()
secHand.shape("secHand")
minHand = Turtle()
minHand.shape("minHand")
hurHand = Turtle()
hurHand.shape("hurHand")
for hand in secHand, minHand, hurHand:
hand.shapesize(1, 1, 3)
hand.speed(0)
#建立输出文字Turtle
printer = Turtle()
printer.hideturtle()
printer.penup()
def SetupClock(radius):
#建立表的外框
reset()
pensize(7)
for i in range(60):
Skip(radius)
if i % 5 == 0:
forward(20)
Skip(-radius-20)
else:
dot(5)
Skip(-radius)
right(6)
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()]
def Date(t):
y = t.year
m = t.month
d = t.day
return "%s %d %d" % (y, m, d)
def Tick():
#绘制表针的动态显示
t = datetime.today()
second = t.second + t.microsecond*0.000001
minute = t.minute + second/60.0
hour = t.hour + minute/60.0
secHand.setheading(6*second) #设置朝向,每秒转动6度
minHand.setheading(6*minute)
hurHand.setheading(30*hour)
tracer(False) #不显示绘制的过程,直接显示绘制结果
printer.forward(65)
printer.write(Week(t), align="center",
font=("Courier", 14, "bold"))
printer.back(130)
printer.write(Date(t), align="center",
font=("Courier", 14, "bold"))
printer.back(50)
printer.write("i_chaoren", align="center",
font=("Courier", 14, "bold"))
printer.home()
tracer(True)
ontimer(Tick, 1000)#1000ms后继续调用tick
def main():
tracer(False) #使多个绘制对象同时显示
Init()
SetupClock(160)
tracer(True)
Tick()
mainloop()
if __name__ == "__main__":
main()
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