What is the method for drawing graphics in PyQt5?

6 months ago

2 minutes

In PyQt5, the QPainter class can be used to draw various shapes such as lines, rectangles, and ellipses. Drawing shapes can be achieved by using a QPainter object in the paintEvent method of a QWidget. Here is an example code:

import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt

class MyWidget(QWidget):
    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setPen(QPen(Qt.black, 2, Qt.SolidLine))
        painter.drawLine(20, 20, 100, 100)
        painter.drawRect(120, 20, 80, 60)
        painter.drawEllipse(220, 20, 80, 60)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MyWidget()
    window.resize(400, 200)
    window.setWindowTitle('Drawing Example')
    window.show()
    sys.exit(app.exec_())

In the example above, we defined a custom window class MyWidget that inherits from QWidget, and used a QPainter object in its paintEvent method to draw a line, a rectangle, and an ellipse. Finally, we displayed the drawn graphics by creating an application object and showing the window.