vtk：如何删除所有观察者

Question

我在我的项目中使用 VTK。现在，我想删除所有观察者并实现我自己的观察者。但是 RemoveAllObservers 不起作用。我的代码是：

from PyQt5.QtWidgets import *
import sys, os
import vtk
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor

def mouseMoveEvent(iren, event):
    print('move')

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

        layout = QVBoxLayout()
        self.setLayout(layout)

        self.vtkWidget = QVTKRenderWindowInteractor()
        layout.addWidget(self.vtkWidget)
        self.ren = vtk.vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)

        interactor = self.vtkWidget.GetRenderWindow().GetInteractor()
        interactor.Initialize()
        interactor.RemoveAllObservers()
        interactor.AddObserver('MouseMoveEvent', mouseMoveEvent)
        interactor.Start()

        self.imageViewer = vtk.vtkImageViewer2()
        self.imageViewer.SetupInteractor(interactor)
        self.imageViewer.SetRenderWindow(self.vtkWidget.GetRenderWindow())

        img = vtk.vtkDICOMImageReader()
        img.SetFileName('C:\Users\MLoong\Desktop\dicom_data\Chang Cheng\TOF\IM_0174')
        img.Update()

        self.imageViewer.SetInputData(img.GetOutput())
        self.imageViewer.Render()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MyWin()
    window.show()
    app.exec_()

即使我通过interactor.RemoveAllObservers()移除所有观察者，图像仍然可以通过鼠标右键缩放in/out。我怎样才能删除所有的观察者？

Answer 1

问题出在您的设置顺序上。

imageViewer.SetupInteractor() 重新创建一些默认观察者。所以你应该在之后删除/创建观察者。

        interactor = self.vtkWidget.GetRenderWindow().GetInteractor()

        self.imageViewer = vtk.vtkImageViewer2()
        self.imageViewer.SetupInteractor(interactor)
        self.imageViewer.SetRenderWindow(self.vtkWidget.GetRenderWindow())

        # img = vtk.vtkDICOMImageReader()
        # img.SetFileName('C:\Users\MLoong\Desktop\dicom_data\Chang Cheng\TOF\IM_0174')
        # using a source for testing
        img = vtk.vtkRTAnalyticSource()
        img.Update()

        self.imageViewer.SetInputData(img.GetOutput())
        self.imageViewer.Render()

        interactor.RemoveAllObservers()
        interactor.AddObserver('MouseMoveEvent', mouseMoveEvent)
        interactor.Initialize()
        interactor.Start()

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