在PyQt5中的图像顶部绘制鼠标轨迹

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

class MyWindow(QWidget):
    def __init__(self):
        super().__init__()

    def paintEvent(self, event):
        painter = QPainter(self)
        pen = QPen(Qt.red, 2, Qt.SolidLine)
        painter.setPen(pen)
        # 在这里绘制鼠标轨迹

def paintEvent(self, event):
    painter = QPainter(self)
    pen = QPen(Qt.red, 2, Qt.SolidLine)
    painter.setPen(pen)
    painter.drawLine(0, 0, 100, 100)

def mouseMoveEvent(self, event):
    self.mouse_pos = event.pos()
    self.update()

def paintEvent(self, event):
    painter = QPainter(self)
    pen = QPen(Qt.red, 2, Qt.SolidLine)
    painter.setPen(pen)
    painter.drawLine(0, 0, self.mouse_pos.x(), self.mouse_pos.y())