使用PyQt5进行实时绘图

from PyQt5.QtWidgets import QApplication, QMainWindow, QGraphicsScene, QGraphicsView
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QPainter, QPen

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.scene = QGraphicsScene()
        self.view = QGraphicsView(self.scene)
        self.timer = QTimer()
        self.timer.timeout.connect(self.update_scene)
        self.timer.start(100)  # 每100毫秒更新一次场景
        self.setCentralWidget(self.view)

def update_scene(self):
    # 清空场景
    self.scene.clear()
    
    # 绘制图形
    pen = QPen(Qt.red)
    pen.setWidth(2)
    self.scene.addEllipse(0, 0, 100, 100, pen)
    
    # 刷新视图
    self.view.setSceneRect(self.scene.itemsBoundingRect())
    self.view.fitInView(self.view.sceneRect(), Qt.KeepAspectRatio)

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()