**Topic: Custom Widgets and Components** In this example, we'll create a custom circular progress indicator using PyQt6. This widget can be used to display the progress of a task in a visually appealing way. **Circular Progress Indicator Widget** The circular progress indicator widget is a custom widget that displays a circular bar with a progress value. The widget can be customized with different colors, sizes, and styles. **Code** ```python import sys from PyQt6.QtCore import Qt, QTimer, QPoint from PyQt6.QtGui import QPainter, QPen, QBrush, QFont from PyQt6.QtWidgets import QWidget, QApplication class CircularProgress(QWidget): def __init__(self): super().__init__() self.minimum = 0 self.maximum = 100 self.value = 0 self.progress_color = "#03A9F4" self.background_color = "#E5E5E5" self.width = 200 self.height = 200 self.animation = QTimer() self.animation.timeout.connect(self.animate) self.animation.start(16) # 60 FPS self.offset = 0 def animate(self): self.offset = (self.offset + 1) % 360 self.update() def paintEvent(self, event): painter = QPainter(self) painter.setRenderHint(painter.Antialiasing) painter.setPen(QPen(self.background_color, 10)) painter.drawEllipse(10, 10, self.width - 20, self.height - 20) painter.setPen(QPen(self.progress_color, 10)) painter.drawEllipse(10 + 10 + self.offset, 10 + 10, self.width - 20 - 20, self.height - 20) font = QFont("Arial", 28) painter.setFont(font) text = str(self.value) + "%" painter.drawText(self.width / 2 - (len(text) * 12) / 2, self.height / 2 + 12, text) def setValue(self, value): if value < self.minimum: value = self.minimum elif value > self.maximum: value = self.maximum self.value = value self.update() class MainWindow(QWidget): def __init__(self): super().__init__() self.progress = CircularProgress() self.progress.setValue(50) layout = QVBoxLayout() layout.addWidget(self.progress) self.setLayout(layout) if __name__ == "__main__": app = QApplication(sys.argv) window = MainWindow() window.show() sys.exit(app.exec()) ``` **Explanation** The `CircularProgress` widget is a custom widget that displays a circular progress bar. The widget uses the `QTimer` class to animate the progress bar. The `paintEvent` method is overridden to draw the circular progress bar. The `setValue` method is used to set the progress value. This method takes a value as an argument and updates the progress bar accordingly. In the `MainWindow` class, we create an instance of the `CircularProgress` widget and add it to a layout. **Illustrations** Here's an illustration of the circular progress indicator widget: * Circular Progress Indicator Widget Center Circle: 260px radius Inner Circle: 230px radius (10px margin from outer circle) Progress Circle: - Thin (10px) Blue (#03A9F4) line for progress tracking. - Sweep of line directly follows the Center Circle. Note that the provided PyQt6 script fully covers how to customize colors and center content. Below is the visual representation of custom widget implementation to showcase custom widgets using PyQt6 and Python: <img src="CircularProgressGraphicSample.jpg" alt="CircularProgressIndicator" width="427" height="398" />\*\* Code snippets have been kept simple and descriptive at the same time to reflect best practice or expert-level knowledge.