Aspect Ratio Calculator using PyQt5

Last Updated : 12 Sep, 2022

In this article we will see how we can create a aspect ratio calculator using PyQt5. The aspect ratio of an image is the ratio of its width to its height. It is commonly expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, the image is x units wide and y units high. Below is how the calculator will look

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:
User has to select a width and height for which calculator will find the diagonal and aspect ratio values, below is the formula for calculating diagonal

diagonal = math.sqrt(width**2 + height**2)

Below is the formula for calculating aspect Ratio (x:1 format)

x = width / height

Below is the formula for calculating aspect Ratio (width:height format)

w = width / gcd
h = height / gcd

Here gcd is the Highest Common Factor (HCF) of width and height

GUI Implementation Steps :
1. Create a heading label that display the calculator name
2. Create two labels for telling user to enter width and height
3. Create two spin box for entering width and height
4. Create a push button for calculating the ratios
5. Create three result labels for showing three various results

Back-End Implementation :
1. Set range to each of the spin box with minimum value equal to 1 so that user can't enter 0 as input
2. Set various properties like alignment, geometry to each of the widget in the window
3. Add action to the push button when it get clicked
4. Inside the push button action get the width and height from the spin boxes
5. Calculate the diagonal value and do formatting of it and show the diagonal value with the help of first result label
6. Calculate the aspect ratio by diving each other this will prove aspect ratio in x : 1 format
7. Show this ratio with the help of second result label
8. Find the gcd of width and height with the help of Euclidean Algorithm
9. Divide the width and height with the gcd
10. Show the new width and height in aspect ratio format with the help of third 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 math

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 = 460

        # 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("Aspect Ratio Calculator", self)

        # 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 label
        w_label = QLabel("Width", self)

        # setting properties to the  label
        w_label.setAlignment(Qt.AlignCenter)
        w_label.setGeometry(20, 100, 170, 40)
        w_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        w_label.setFont(QFont('Times', 9))

        # creating a spin box
        self.w_spin = QSpinBox(self)

        # setting geometry to the spin box
        self.w_spin.setGeometry(200, 100, 180, 40)

        # setting range to the spin box
        self.w_spin.setRange(1, 999999)

        # setting font and alignment
        self.w_spin.setFont(QFont('Times', 9))
        self.w_spin.setAlignment(Qt.AlignCenter)

        # creating a label
        h_label = QLabel("Height", self)

        # setting properties to the label
        h_label.setAlignment(Qt.AlignCenter)
        h_label.setGeometry(20, 150, 170, 40)
        h_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        h_label.setFont(QFont('Times', 9))

        # creating a spin box
        self.h_spin = QSpinBox(self)

        # setting geometry to the spin box
        self.h_spin.setGeometry(200, 150, 180, 40)

        # setting range
        self.h_spin.setRange(1, 999999)

        # setting font and alignment
        self.h_spin.setFont(QFont('Times', 9))
        self.h_spin.setAlignment(Qt.AlignCenter)

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

        # setting geometry to the push button
        calculate.setGeometry(125, 220, 150, 40)

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

        # creating a label
        self.result1 = QLabel(self)

        # setting properties to result label
        self.result1.setAlignment(Qt.AlignCenter)
        self.result1.setGeometry(25, 300, 350, 40)
        self.result1.setStyleSheet("QLabel"
                                  "{"
                                  "border : 3px solid black;"
                                  "background : white;"
                                  "}")
        self.result1.setFont(QFont('Arial', 11))

        # creating a label
        self.result2 = QLabel(self)

        # setting properties to result label
        self.result2.setAlignment(Qt.AlignCenter)
        self.result2.setGeometry(25, 350, 350, 40)
        self.result2.setStyleSheet("QLabel"
                                   "{"
                                   "border : 3px solid black;"
                                   "background : white;"
                                   "}")
        self.result2.setFont(QFont('Arial', 11))

        # creating a label
        self.result3 = QLabel(self)

        # setting properties to result label
        self.result3.setAlignment(Qt.AlignCenter)
        self.result3.setGeometry(25, 400, 350, 40)
        self.result3.setStyleSheet("QLabel"
                                   "{"
                                   "border : 3px solid black;"
                                   "background : white;"
                                   "}")
        self.result3.setFont(QFont('Arial', 11))

    def calculate_action(self):

        # getting width
        width = self.w_spin.value()

        # getting height
        height = self.h_spin.value()

        # calculating diagonal
        diagonal = width**2 + height**2
        diagonal = math.sqrt(diagonal)

        # doing formatting of diagonal
        diagonal = '%.2f' % diagonal

        # setting text to the result 1
        self.result1.setText("Diagonal = " + diagonal)

        # calculating aspect ratio (x:1 format)
        x = width / height

        # formatting X value
        x = '%.2f' % x

        # setting text to the result 2
        self.result2.setText("Aspect Ratio (x:1 format) = " + x + " : 1")

        # calculating aspect ratio (w:h format)
        # method to calculate GCD using Euclidean Algorithm
        def computeGCD(x, y):
            # looping
            while (y):
                x, y = y, x % y

            # returning gcd value
            return x

        gcd = computeGCD(width, height)

        # setting width and height value
        width = width//gcd
        height = height//gcd

        # setting text to the result 3
        self.result3.setText("Aspect ratio (w:h format) = " + str(width) + " : " + str(height))


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

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

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

Output :

Ratio Calculator using PyQt5

rakshitarora

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Article Tags :

Practice Tags :

python

Aspect Ratio Calculator using PyQt5

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