**Course Title:** PyQt6 Application Development **Section Title:** Graphics and Animations **Topic:** Creating a graphical app with animations and custom drawings. **Objective:** In this lab, you will learn how to create a graphical application with animations and custom drawings using PyQt6. You will understand how to use the QGraphicsView and QGraphicsScene to display graphics items, animate them, and handle user events. **Prerequisites:** * Familiarity with PyQt6 and its GUI components * Understanding of graphics and animations concepts * Basic knowledge of Python and object-oriented programming **Materials:** * PyQt6 documentation: [https://www.riverbankcomputing.com/static/Docs/PyQt6/](https://www.riverbankcomputing.com/static/Docs/PyQt6/) * Qt documentation: [https://doc.qt.io/](https://doc.qt.io/) **Lab Instructions:** ### Step 1: Create a new QGraphicsView and QGraphicsScene Create a new PyQt6 application and add a QGraphicsView to your main window. Create a QGraphicsScene and set it as the scene for the QGraphicsView. ```python import sys from PyQt6.QtWidgets import QApplication, QGraphicsView, QGraphicsScene, QGraphicsItem from PyQt6.QtGui import QBrush, QPen class GraphicsView(QGraphicsView): def __init__(self): super().__init__() self.scene = QGraphicsScene() self.setScene(self.scene) if __name__ == "__main__": app = QApplication(sys.argv) view = GraphicsView() view.resize(800, 600) view.show() sys.exit(app.exec()) ``` ### Step 2: Create custom graphics items Create a new class that inherits from QGraphicsItem. Override the paint method to draw your custom graphics item. ```python class CustomItem(QGraphicsItem): def __init__(self): super().__init__() self.brush = QBrush(QColor(255, 0, 0)) self.pen = QPen(QColor(0, 0, 0)) def paint(self, painter, option, widget): painter.setBrush(self.brush) painter.setPen(self.pen) painter.drawRect(0, 0, 100, 100) ``` ### Step 3: Add custom graphics items to the scene Add your custom graphics items to the QGraphicsScene. ```python view.scene.addItem(CustomItem()) ``` ### Step 4: Animate the graphics items Use the QPropertyAnimation class to animate the graphics items. ```python from PyQt6.QtCore import QPropertyAnimation animation = QPropertyAnimation(view.scene.items()[0], b"pos") animation.setDuration(1000) animation.setStartValue(QPointF(0, 0)) animation.setEndValue(QPointF(100, 100)) animation.start() ``` ### Step 5: Handle user events Override the mousePressEvent method in your custom graphics item to handle user events. ```python class CustomItem(QGraphicsItem): def mousePressEvent(self, event): print("Mouse pressed") ``` **Additional Tips and Variations:** * Use the QSequentialAnimationGroup class to animate multiple graphics items sequentially. * Use the QParallelAnimationGroup class to animate multiple graphics items in parallel. * Use the QGraphicsItemAnimation class to animate the position, scale, and rotation of graphics items. **What to Do Next:** * Experiment with different graphics items and animations. * Try using different brush and pen styles. * Read the Qt documentation on graphics and animations to learn more about the available classes and methods. **Ask for Help:** If you have any questions or need help with this lab, leave a comment below.