在pyqt5中使用鼠标滚轮在QGraphicsScene上缩放图像

from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene
from PyQt5.QtCore import Qt

class CustomGraphicsView(QGraphicsView):
    def wheelEvent(self, event):
        # 获取滚轮滚动的角度
        angle = event.angleDelta().y() / 8

        # 计算缩放因子
        scaleFactor = 1.15 ** (angle / 120)

        # 获取当前的缩放因子
        currentScale = self.transform().m11()

        # 设置缩放的中心点为鼠标所在位置
        self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)

        # 进行缩放
        self.scale(scaleFactor, scaleFactor)

scene = QGraphicsScene()
view = CustomGraphicsView(scene)

image = QGraphicsPixmapItem(QPixmap("image.jpg"))
scene.addItem(image)

view.show()