Creating Golden Ratio Calculator using PyQt5

In this article we will see how we can create a golden ratio calculator using PyQt5. In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. The value of golden ratio is 1.61803398875. Below is how the golden ratio calculator will look like PyQt5 is 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. Below is the command to install the PyQt5

pip install PyQt5

Concept : Below is the formula for calculating golden ratio

A / B = (A + B) / A = golden_ratio

Here A is the larger length and B is the shorter i.e second part of the length and the value of golden ratio is 1.61803398875.

GUI Implementation Steps : 1. Create a heading label that display the calculator name 2. Create three radio buttons for first, second and sum of the lengths 3. Create three spin boxes for user to enter the specific length 4. Create push button for calculating the other values according to golden ratio 5. Create a label to show the calculated values Back-End Implementation : 1. Initially make all the spin boxes disable 2. Add same action to all the three radio button 3. Inside the radio button method which radio button is checked 4. According to the checked radio button make the corresponding spin box enable and make the rest of the spin box disable 5. Also assign the flag values according to the selected radio button 6. Add same action to all three spin boxes 7. Inside the spin box action check which spin box is enabled and make other spin box values zero 8. Add action to the push button 9. Inside the push button action check the flag according to the flag with the help of golden ratio formula calculate the other two lengths 10. Format the calculated values and show the values with the help of result label

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 datetime
import sys


class Window(QMainWindow):

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

        # setting title
        self.setWindowTitle("Python ")

        # width of window
        self.w_width = 400

        # height of window
        self.w_height = 430

        # setting geometry
        self.setGeometry(100, 100, self.w_width, self.w_height)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for components
    def UiComponents(self):

        # creating head label
        head = QLabel("Golden Ratio Calculator", self)

        head.setWordWrap(True)

        # setting geometry to the head
        head.setGeometry(0, 10, 400, 60)

        # font
        font = QFont('Times', 15)
        font.setBold(True)
        font.setItalic(True)
        font.setUnderline(True)

        # setting font to the head
        head.setFont(font)

        # setting alignment of the head
        head.setAlignment(Qt.AlignCenter)

        # setting color effect to the head
        color = QGraphicsColorizeEffect(self)
        color.setColor(Qt.darkCyan)
        head.setGraphicsEffect(color)


        # creating a radio button
        self.length1 = QRadioButton("First Length (A)", self)

        # setting geometry
        self.length1.setGeometry(50, 90, 140, 40)

        # setting font
        self.length1.setFont(QFont('Times', 9))

        # creating a spin box
        self.l1 = QSpinBox(self)
        self.l1.setMaximum(999999)

        # setting geometry to the spin box
        self.l1.setGeometry(200, 90, 160, 40)

        # setting font
        self.l1.setFont(QFont('Times', 9))

        # setting alignment
        self.l1.setAlignment(Qt.AlignCenter)

        # creating a radio button
        self.length2 = QRadioButton("Second Length (B)", self)

        # setting geometry
        self.length2.setGeometry(50, 150, 145, 40)

        # setting font
        self.length2.setFont(QFont('Times', 9))

        # creating a spin box
        self.l2 = QSpinBox(self)
        self.l2.setMaximum(999999)

        # setting geometry to the spin box
        self.l2.setGeometry(200, 150, 160, 40)

        # setting font
        self.l2.setFont(QFont('Times', 9))

        # setting alignment
        self.l2.setAlignment(Qt.AlignCenter)

        # creating a radio button
        self.length_sum = QRadioButton("First + Second ", self)

        # setting geometry
        self.length_sum.setGeometry(50, 200, 140, 40)

        # setting font
        self.length_sum.setFont(QFont('Times', 9))

        # creating a spin box
        self.l_s = QSpinBox(self)
        self.l_s.setMaximum(999999)

        # setting geometry to the spin box
        self.l_s.setGeometry(200, 200, 160, 40)

        # setting font
        self.l_s.setFont(QFont('Times', 9))

        # setting alignment
        self.l_s.setAlignment(Qt.AlignCenter)

        # adding same action to all the radio button
        self.length1.clicked.connect(self.radio_method)
        self.length2.clicked.connect(self.radio_method)
        self.length_sum.clicked.connect(self.radio_method)

        # adding same action to all the spin box
        self.l1.valueChanged.connect(self.spin_method)
        self.l2.valueChanged.connect(self.spin_method)
        self.l_s.valueChanged.connect(self.spin_method)

        # making all the spin box disabled
        self.l1.setDisabled(True)
        self.l2.setDisabled(True)
        self.l_s.setDisabled(True)



        # creating a push button
        calculate = QPushButton("Calculate", self)

        # setting geometry to the push button
        calculate.setGeometry(100, 270, 200, 40)

        # adding action to the button
        calculate.clicked.connect(self.calculate)

        # adding color effect to the push button
        color = QGraphicsColorizeEffect()
        color.setColor(Qt.blue)
        calculate.setGraphicsEffect(color)


        # creating a label to show result
        self.result = QLabel(self)

        # setting properties to result label
        self.result.setAlignment(Qt.AlignCenter)

        # setting geometry
        self.result.setGeometry(50, 330, 300, 70)

        # making it multi line
        self.result.setWordWrap(True)

        # setting stylesheet
        # adding border and background
        self.result.setStyleSheet("QLabel"
                                  "{"
                                  "border : 3px solid black;"
                                  "background : white;"
                                  "}")

        # setting font
        self.result.setFont(QFont('Arial', 11))


    # method called by the radio buttons
    def radio_method(self):

        # checking who is checked and who is unchecked
        # if first radio button is checked
        if self.length1.isChecked():

            # making first spin box enable
            self.l1.setEnabled(True)

            # making rest two spin box disable
            self.l2.setDisabled(True)
            self.l_s.setDisabled(True)


            # assigning flags
            self.check1 = True
            self.check2 = False
            self.check_sum = False

        elif self.length2.isChecked():

            # making second spin box enable
            self.l2.setEnabled(True)

            # making rest two spin box disable
            self.l1.setDisabled(True)
            self.l_s.setDisabled(True)


            # assigning flags
            self.check1 = False
            self.check2 = True
            self.check_sum = False


        elif self.length_sum.isChecked():

            # making third spin box enable
            self.l_s.setEnabled(True)

            # making rest two spin box disable
            self.l1.setDisabled(True)
            self.l2.setDisabled(True)


            # assigning flags
            self.check1 = False
            self.check2 = False
            self.check_sum = True

    def spin_method(self):

        # finding who called the method
        if self.l1.isEnabled():

            # setting current values
            self.l2.setValue(0)
            self.l_s.setValue(0)


        elif self.l2.isEnabled():

            # setting current values
            self.l1.setValue(0)
            self.l_s.setValue(0)

        else:
            # setting current values
            self.l2.setValue(0)
            self.l1.setValue(0)

    def calculate(self):



        golden = 1.61803398875


        # if first value is selected
        if self.check1 == True:

            # getting spin box value
            A = self.l1.value()

            B = A / golden

            Sum = A + B

        elif self.check2 == True:

            # getting spin box value
            B = self.l2.value()

            A = B * golden

            Sum = A + B

        else:
            # getting spin box value
            Sum = self.l_s.value()

            A = Sum / golden

            B = Sum - A



        # formatting values upto two decimal
        A = "{:.2f}".format(A)
        B = "{:.2f}".format(B)
        Sum = "{:.2f}".format(Sum)

        # setting text to the label
        self.result.setText("A = " + str(A) + ", B = " + str(B) +
                                        " and Sum = " + str(Sum))





# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

Output :