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 ? according to Qt Documentation The 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.

So first 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

Also you can check more Python GUI articles in the below links

1: Kivy GUI Development Tutorials

2: TKinter GUI Development Tutorials

3: Psyide2 GUI Development

4: wxPython GUI Development Tutorials

5: PyQt5 GUI Development Tutorials

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__()

        self.title = "PyQt5 Window"
        self.top = 200
        self.left = 500
        self.width = 400
        self.height = 300


        self.InitWindow()


    def InitWindow(self):
        self.setWindowIcon(QtGui.QIcon("icon.png"))
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.show()

    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)


App = QApplication(sys.argv)
window = Window()
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__()

self.title = "PyQt5 Window"

self.top = 200

self.left = 500

self.width = 400

self.height = 300

self.InitWindow()

def InitWindow(self):

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

self.setWindowTitle(self.title)

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

self.show()

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)

App = QApplication(sys.argv)

window = Window()

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)