Create Analog Clock using PyQt5 in Python

Prerequisite: Introduction to pyqt-5

A clock or watch is called “analog” when it has moving hands and (usually) hours marked from number 1 to 12 to show you the time. Some have Roman Numerals (I, II, III, etc) instead, or no numbers at all! In other words: not a digital clock.

PyQt5 is a cross-platform GUI toolkit, a set of python bindings for Qt v5. One can develop an interactive desktop application with so much ease because of the tools and simplicity provided by this library. A GUI application consists of Front-end and Back-end.

Approach :

• Create a Clock class which inherits the QMainWindow class.
• Inside the Clock class creating a timer object which updates the whole code after each second. 
• Create three polygon objects for each hand of the clock .
• Create a paint event method.
• Inside the paint event method get the current time and the minimum of windows width or height .
• Create a painter object and a method to draw the hands. 
• Inside the method for drawing hands(pointer) take arguments like color, rotation and polygon object.
• Rotate the painter object and draw the pointer.
• Inside the paint event method, according to the current time set the rotation value and call the draw pointer method. 
• Draw the background image of the clock i.e lines for each hour. 

Below is the implementation :

Python3

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys

# creating a clock class
class Clock(QMainWindow):

    # constructor
    def __init__(self):
        super().__init__()

        # creating a timer object
        timer = QTimer(self)

        # adding action to the timer
        # update the whole code
        timer.timeout.connect(self.update)

        # setting start time of timer i.e 1 second
        timer.start(1000)

        # setting window title
        self.setWindowTitle('Clock')

        # setting window geometry
        self.setGeometry(200, 200, 300, 300)

        # setting background color to the window
        self.setStyleSheet("background : black;")

        # creating hour hand
        self.hPointer = QtGui.QPolygon([QPoint(6, 7),
                                        QPoint(-6, 7),
                                        QPoint(0, -50)])

        # creating minute hand
        self.mPointer = QPolygon([QPoint(6, 7),
                                  QPoint(-6, 7),
                                  QPoint(0, -70)])

        # creating second hand
        self.sPointer = QPolygon([QPoint(1, 1),
                                  QPoint(-1, 1),
                                  QPoint(0, -90)])
        # colors
        # color for minute and hour hand
        self.bColor = Qt.green

        # color for second hand
        self.sColor = Qt.red

    # method for paint event
    def paintEvent(self, event):

        # getting minimum of width and height
        # so that clock remain square
        rec = min(self.width(), self.height())

        # getting current time
        tik = QTime.currentTime()

        # creating a painter object
        painter = QPainter(self)


        # method to draw the hands
        # argument : color rotation and which hand should be pointed
        def drawPointer(color, rotation, pointer):

            # setting brush
            painter.setBrush(QBrush(color))

            # saving painter
            painter.save()

            # rotating painter
            painter.rotate(rotation)

            # draw the polygon i.e hand
            painter.drawConvexPolygon(pointer)

            # restore the painter
            painter.restore()


        # tune up painter
        painter.setRenderHint(QPainter.Antialiasing)

        # translating the painter
        painter.translate(self.width() / 2, self.height() / 2)

        # scale the painter
        painter.scale(rec / 200, rec / 200)

        # set current pen as no pen
        painter.setPen(QtCore.Qt.NoPen)


        # draw each hand
        drawPointer(self.bColor, (30 * (tik.hour() + tik.minute() / 60)), self.hPointer)
        drawPointer(self.bColor, (6 * (tik.minute() + tik.second() / 60)), self.mPointer)
        drawPointer(self.sColor, (6 * tik.second()), self.sPointer)


        # drawing background
        painter.setPen(QPen(self.bColor))

        # for loop
        for i in range(0, 60):

            # drawing background lines
            if (i % 5) == 0:
                painter.drawLine(87, 0, 97, 0)

            # rotating the painter
            painter.rotate(6)

        # ending the painter
        painter.end()

# Driver code
if __name__ == '__main__':

  app = QApplication(sys.argv)

  # creating a clock object
  win = Clock()

  # show
  win.show()

  exit(app.exec_())

Output: