Answer
code
Work Step by Step
# 12.12 (Tkinter: a group of clocks) Write a program that displays four clocks, as shown in
# Figure 12.24.
import math
from datetime import datetime
from tkinter import *
class StillClock(Canvas):
def __init__(self, container):
super().__init__(container)
self.setCurrentTime()
def getHour(self):
return self.__hour
def setHour(self, hour):
self.__hour = hour
self.delete("clock")
self.drawClock()
def getMinute(self):
return self.__minute
def setMinute(self, minute):
self.__minute = minute
self.delete("clock")
self.drawClock()
def getSecond(self):
return self.__second
def setSecond(self, second):
self.__second = second
self.delete("clock")
self.drawClock()
def setCurrentTime(self):
d = datetime.now()
self.__hour = d.hour
self.__minute = d.minute
self.__second = d.second
self.delete("clock")
self.drawClock()
def drawClock(self):
width = float(self["width"])
height = float(self["height"])
radius = min(width, height) / 2.4
secondHandLength = radius * 0.8
minuteHandLength = radius * 0.65
hourHandLength = radius * 0.5
self.create_oval(width / 2 - radius, height / 2 - radius,
width / 2 + radius, height / 2 + radius, tags="clock")
self.create_text(width / 2 - radius + 5, height / 2,
text="9", tags="clock")
self.create_text(width / 2 + radius - 5, height / 2,
text="3", tags="clock")
self.create_text(width / 2, height / 2 - radius + 5,
text="12", tags="clock")
self.create_text(width / 2, height / 2 + radius - 5,
text="6", tags="clock")
xCenter = width / 2
yCenter = height / 2
second = self.__second
xSecond = xCenter + secondHandLength \
* math.sin(second * (2 * math.pi / 60))
ySecond = yCenter - secondHandLength \
* math.cos(second * (2 * math.pi / 60))
self.create_line(xCenter, yCenter, xSecond, ySecond,
fill="red", tags="clock")
minute = self.__minute
xMinute = xCenter + \
minuteHandLength * math.sin(minute * (2 * math.pi / 60))
yMinute = yCenter - \
minuteHandLength * math.cos(minute * (2 * math.pi / 60))
self.create_line(xCenter, yCenter, xMinute, yMinute,
fill="blue", tags="clock")
hour = self.__hour % 12
xHour = xCenter + hourHandLength * \
math.sin((hour + minute / 60) * (2 * math.pi / 12))
yHour = yCenter - hourHandLength * \
math.cos((hour + minute / 60) * (2 * math.pi / 12))
self.create_line(xCenter, yCenter, xHour, yHour,
fill="green", tags="clock")
timestr = str(hour) + ":" + str(minute) + ":" + str(second)
self.create_text(width / 2, height / 2 + radius + 10,
text=timestr, tags="clock")
window = Tk() # Create a window
window.title("Display Clocks") # Set title
clock1 = StillClock(window)
clock1.grid(row=1, column=1)
clock2 = StillClock(window)
clock2.grid(row=1, column=2)
clock3 = StillClock(window)
clock3.grid(row=1, column=3)
clock4 = StillClock(window)
clock4.grid(row=1, column=4)
window.mainloop() # Create an event loop
