PyQt5 pixels


You can paint in a PyQt5 window using the QPainter widget.
We set the window background using:

# Set window background color
self.setAutoFillBackground(True)
p = self.palette()
p.setColor(self.backgroundRole(), Qt.white)
self.setPalette(p)

Pixels are added using the drawPoint(x, y) method.

qpainter
PyQt5 qpainter example

PyQt5 QPainter example
The example below paints pixels in the QPainter widget:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QLabel
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import Qt
import random
 
class App(QMainWindow):
 
    def __init__(self):
        super().__init__()
        self.title = 'PyQt paint - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 440
        self.height = 280
        self.initUI()
 
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
 
        # Set window background color
        self.setAutoFillBackground(True)
        p = self.palette()
        p.setColor(self.backgroundRole(), Qt.white)
        self.setPalette(p)
 
        # Add paint widget and paint
        self.m = PaintWidget(self)
        self.m.move(0,0)
        self.m.resize(self.width,self.height)
 
        self.show()
 
 
class PaintWidget(QWidget):
   def paintEvent(self, event):
      qp = QPainter(self)
 
      qp.setPen(Qt.black)
      size = self.size()
 
      for i in range(1024):
          x = random.randint(1, size.width()-1)
          y = random.randint(1, size.height()-1)
          qp.drawPoint(x, y)
 
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())