在python中的PyQt5中绘制类似光标的对象

from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt

class MyWidget(QWidget):
    def paintEvent(self, event):
        painter = QPainter(self)
        pen = QPen(Qt.red)  # 设置画笔颜色为红色
        pen.setWidth(2)  # 设置画笔宽度为2
        painter.setPen(pen)
        painter.drawLine(10, 10, 50, 50)  # 绘制一条直线

if __name__ == '__main__':
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()