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 librariesfrom PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import *from PyQt5.QtCore import *import datetimeimport sysclass 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 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
