funcgraph.py 文件源码

def wheelEvent(self, event: QtGui.QWheelEvent):
        if event.modifiers() & QtCore.Qt.ShiftModifier:
            delta = event.angleDelta()
            if delta.y() > 0:
                scale = self.zoom_in
            else:
                scale = 1 / self.zoom_in

            # Set Anchors
            self.setResizeAnchor(QtWidgets.QGraphicsView.NoAnchor)
            self.setTransformationAnchor(QtWidgets.QGraphicsView.NoAnchor)

            cur_pos = self.mapToScene(event.pos())
            self.scale(scale, scale)
            new_pos = self.mapToScene(event.pos())
            delta_zoomed = new_pos - cur_pos
            self.translate(delta_zoomed.x(), delta_zoomed.y())

            event.accept()
            return

        return super(VQVivFuncGraphCanvas, self).wheelEvent(event)