testing_Qt.py

import sys
from PySide6.QtWidgets import QMainWindow, QVBoxLayout, QWidget, QApplication, QLabel
from PySide6.QtGui import QPixmap
from PySide6.QtCore import Qt

# Description: This script builds a small QApplication GUI with a label to demonstrate blurred rendering of
# low-resolution pixel art.


class ScaledLabel(QLabel):
    def __init__(self, *args, **kwargs):
        QLabel.__init__(self)
        self._pixmap = self.pixmap()

    def resizeEvent(self, event):
        self.setPixmap(self._pixmap)

    def setPixmap(self, pixmap):

        if not pixmap:
            return

        self._pixmap = pixmap
        return (QLabel.setPixmap(self,
                                 self._pixmap.scaled(self.frameSize(),
                                                     Qt.KeepAspectRatio,
                                                     Qt.FastTransformation)))


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

        # Specify the path to the pixel art .png file to display:
        path_to_png = 'pixel_art.png'

        # Create an instance of the QLabel class:
        self.my_scaled_label = ScaledLabel()

        # Display the pixel art as a pixmap in the label:
        self.my_scaled_label.setPixmap(QPixmap(path_to_png))

        # Place the label & buttons in a vertical layout:
        layout_v = QVBoxLayout()
        layout_v.addWidget(self.my_scaled_label)

        # Create a placeholder widget to hold the layout.
        widget = QWidget()
        widget.setLayout(layout_v)

        # Set the central widget of the main window:
        self.setCentralWidget(widget)


# Run the QApplication:
app = QApplication(sys.argv)
w = MainWindow()
w.show()
app.exec()

print('app finished')