python - 将 vtkTimerCallback 与 QVTKRenderWindowInteractor 一起使用不起作用

Question

我遇到了 vtk (8.1)、pyqt5 (5.10.1) 的问题。如果我将 vtkCallBackTimer 与“原始”vtk.vtkRenderWindowInteractor() 一起使用，则一切正常。但是，如果我使用 vtk.qt.QVTKRenderWindowInteractor.QVTKRenderWindowInteractor() 回调函数将连续执行，不会暂停。这是示例:

import sys
from PyQt5 import QtWidgets
import vtk
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from mainwindow import Ui_MainWindow

class vtkTimerCallback():
    def __init__(self):
        self.timer_count = 0

    def execute(self, obj, event):
        print(self.timer_count)
        self.actor.SetPosition(self.timer_count, self.timer_count, 0)
        iren = obj
        iren.GetRenderWindow().Render()
        self.timer_count += 1

class ExampleApp(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super (ExampleApp, self).__init__(parent)
        self.setupUi(self)
        sphereSource = vtk.vtkSphereSource()
        sphereSource.SetCenter(0.0, 0.0, 0.0)
        sphereSource.SetRadius(5)
        mapper = vtk.vtkPolyDataMapper()
        mapper.SetInputConnection(sphereSource.GetOutputPort())
        actor = vtk.vtkActor()
        actor.SetMapper(mapper)
        renderer = vtk.vtkRenderer()
        renderWindow = vtk.vtkRenderWindow()
        renderWindow.AddRenderer(renderer)
        renderWindowInteractor = vtk.vtkRenderWindowInteractor # <-- WOKRING
        renderWindowInteractor = QVTKRenderWindowInteractor(self.frame) # <-- NOT WORKING (self.frame is a QFrame in the mainwindow.ui)
        renderWindowInteractor.SetRenderWindow(renderWindow)
        renderer.AddActor(actor)
        renderer.SetBackground(1, 1, 1)  # Background color white
        renderWindow.Render()
        renderWindowInteractor.Initialize()
        cb = vtkTimerCallback()
        cb.actor = actor
        renderWindowInteractor.AddObserver('TimerEvent', cb.execute)
        #****************
        renderWindowInteractor.CreateRepeatingTimer(1000) #Pause between new function call in millisecs,
        # with the QVTKRenderWindowInteractor the pause is ignored ?????
        #****************
        renderWindowInteractor.Start()

def main():
    app = QtWidgets.QApplication(sys.argv)
    trudeUI = ExampleApp()
    trudeUI.show()
    app.exec_()

if __name__ =='__main__':
    main()

希望大家能帮忙。我需要动画的 RepeatingTimer 。如果某人。有替代方案也可以，但请不要使用 QtCore.QTimer。应该是vtk的东西...我已经尝试了 4 个小时了，欢迎任何帮助...

Answer 1

刚刚遇到了同样的问题。据我观察，这似乎是来自 QVTKRenderWindowInteractor 类的错误。创建重复计时器时，不考虑持续时间参数(示例中为 1000)，而是使用默认参数 (10)。

为了解决这个问题，我创建了一个子类 MyQVTKRenderWindowInteractor 并覆盖了我需要的方法:

class MyQVTKRenderWindowInteractor(QVTKRenderWindowInteractor):
   def __init__(self, *arg):
       super(MyQVTKRenderWindowInteractor, self).__init__(*arg)
       self._TimerDuration = 10 # default value

   def CreateTimer(self, obj, event):
       self._Timer.start(self._TimerDuration) # self._Timer.start(10) in orginal

   def CreateRepeatingTimer(self, duration):
       self._TimerDuration = duration
       super(MyQVTKRenderWindowInteractor, self).GetRenderWindow().GetInteractor().CreateRepeatingTimer(duration)
       self._TimeDuration = 10

现在renderWindowInteractor = MyQVTKRenderWindowInteractor(self.frame)应该可以工作了。

跳跃的答案来得还不算晚++