Introduction To PyQt5 QLinearGradient Color

In this PyQt5 article iam going to have Introduction To PyQt5 QLinearGradient Color
also we are going to make an example for the QLinearGradient Color in PyQt5, there are three different kinds of Gradient Color in PyQt5, we have QLinearGradient, QRadialGradient and QConicalGradient. so first of all what is QLinearGradient ?

What is PyQt5 QLinearGradient?

According to Qt Documentation QLinearGradient class is used in combination with QBrush to specify a linear gradient brush. Linear gradients interpolate colors between start and end points. Outside these points the gradient is either padded, reflected or repeated depending on the currently set spread method.

Frst of all you can check my some articles on QPainter

1: PyQt5 Drawing Rectangle With QPainter Class

2: PyQt5 Drawing Ellipse With QPainter Class

3: PyQt5 Drawing Polygon With QPainter Class

4: PyQt5 Brush Styles

So now this is the complete source code for Introduction To PyQt5 QLinearGradient Color

from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtGui import QPainter, QBrush, QPen, QLinearGradient
from PyQt5.QtCore import Qt

class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        # Window properties
        self.title = "Codeloop - PyQt5 Window"
        self.top = 200
        self.left = 500
        self.width = 400
        self.height = 300

        # Initialize the window
        self.InitWindow()

    def InitWindow(self):
        
        # Set window icon
        self.setWindowIcon(QtGui.QIcon("codeloop.png"))
        
        # Set window title and geometry
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        # Show the window
        self.show()

    def paintEvent(self, e):
        # Define a QPainter object for painting
        painter = QPainter(self)
        
        # Set pen properties
        painter.setPen(QPen(Qt.black, 4, Qt.SolidLine))
        
        # Create a linear gradient for filling
        grad1 = QLinearGradient(25, 100, 150, 175)
        
        # Set gradient colors
        grad1.setColorAt(0.0, Qt.darkGray)
        grad1.setColorAt(0.5, Qt.green)
        grad1.setColorAt(1.0, Qt.yellow)
        
        # Set brush with the gradient
        painter.setBrush(QBrush(grad1))
        
        # Draw a rectangle with the gradient brush
        painter.drawRect(10, 10, 200, 200)

# Create the application instance
App = QApplication(sys.argv)
# Create the main window
window = Window()
# Execute the application
sys.exit(App.exec())

from PyQt5 import QtGui

from PyQt5.QtWidgets import QApplication, QMainWindow

import sys

from PyQt5.QtGui import QPainter, QBrush, QPen, QLinearGradient

from PyQt5.QtCore import Qt

class Window(QMainWindow):

def __init__(self):

super().__init__()

# Window properties

self.title = "Codeloop - PyQt5 Window"

self.top = 200

self.left = 500

self.width = 400

self.height = 300

# Initialize the window

self.InitWindow()

def InitWindow(self):

# Set window icon

self.setWindowIcon(QtGui.QIcon("codeloop.png"))

# Set window title and geometry

self.setWindowTitle(self.title)

self.setGeometry(self.left, self.top, self.width, self.height)

# Show the window

self.show()

def paintEvent(self, e):

# Define a QPainter object for painting

painter = QPainter(self)

# Set pen properties

painter.setPen(QPen(Qt.black, 4, Qt.SolidLine))

# Create a linear gradient for filling

grad1 = QLinearGradient(25, 100, 150, 175)

# Set gradient colors

grad1.setColorAt(0.0, Qt.darkGray)

grad1.setColorAt(0.5, Qt.green)

grad1.setColorAt(1.0, Qt.yellow)

# Set brush with the gradient

painter.setBrush(QBrush(grad1))

# Draw a rectangle with the gradient brush

painter.drawRect(10, 10, 200, 200)

# Create the application instance

App = QApplication(sys.argv)

# Create the main window

window = Window()

# Execute the application

sys.exit(App.exec())

So this is the important line of code in QPainter class, when you want to draw you need create a built in method of def paintEvent(), the purpose of this method is for drawing shapes, so first we have created the object of QPainter class and after that we have created the QLinearGradient object and we set the color position for the Linear Gradient at the end we have drawn our rectangle.

def paintEvent(self, e):
    painter = QPainter(self)
    painter.setPen(QPen(Qt.black, 4, Qt.SolidLine))

    grad1 = QLinearGradient(25, 100, 150, 175)

    grad1.setColorAt(0.0, Qt.darkGray)
    grad1.setColorAt(0.5, Qt.green)
    grad1.setColorAt(1.0, Qt.yellow)
    painter.setBrush(QBrush(grad1))

    painter.drawRect(10, 10, 200, 200)

def paintEvent(self, e):

painter = QPainter(self)

painter.setPen(QPen(Qt.black, 4, Qt.SolidLine))

grad1 = QLinearGradient(25, 100, 150, 175)

grad1.setColorAt(0.0, Qt.darkGray)

grad1.setColorAt(0.5, Qt.green)

grad1.setColorAt(1.0, Qt.yellow)

painter.setBrush(QBrush(grad1))

painter.drawRect(10, 10, 200, 200)

Run the complete code and this will be the result.

Introduction To PyQt5 QLinearGradient Color

FAQs:

What is PyQt5 used for?

PyQt5 is Python binding for Qt framework. It is used to develop cross-platform desktop applications with rich graphical user interfaces (GUIs). PyQt5 allows you to create applications with features such as windows, buttons, menus, dialog boxes and many more, using Python programming language.

How to use Qt Designer in Python?

Qt Designer is a graphical user interface design tool provided by Qt for creating and designing GUIs. For using Qt Designer with PyQt5 in Python, follow these steps:

Install PyQt5 and Qt Designer (PyQt5-Tools).
Create your GUI design using Qt Designer and save the .ui file.

Convert the .ui file to Python module using pyuic5 command-line tool.
Import the generated Python module into your Python application and use it to create the GUI.

How to create a GUI with PyQt5?

For creating a GUI with PyQt5, follow these basic steps:

Import necessary modules from PyQt5.
Create a subclass of QMainWindow or QWidget to represent your main window or widget.
Define layout and components of your GUI (buttons, labels, etc.) in the subclass’s constructor method.

Set up event handlers or signals and slots to handle user interactions.
Instantiate your subclass, set any additional properties, and show the GUI using the show() method.

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What is PyQt5 QLinearGradient?

FAQs:

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