带有 Qt5 的 VTK - 与窗口交互时计时器停止运行 [英] VTK with Qt5 - Timer stops running when window is interacted with

问题描述

我一直在尝试用 VTK 做动画，所以我一直在使用 TimerEvent.当我试图转移到 Qt 绑定时，它坏了.问题是，一旦我与视图交互(比如滚动缩放或单击旋转)，计时器就会停止.这是一个简单的最小示例:

I've been trying to do animation with VTK, so I've been using TimerEvent. When I tried to move over to the Qt binding, it broke. The problem is that as soon as I interact with the view (say scrolling to zoom, or clicking to rotate) the timer stops. Here's a simple minimal example:

import vtk
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from PyQt5 import Qt

message = "tick"
def onTimerEvent(object, event):
    global message
    print(message)
    if message == "tick":
        message = "tock"
    else:
        message = "tick"

app = Qt.QApplication([])
mainWindow = Qt.QMainWindow()
renderer = vtk.vtkRenderer()
vtkWidget = QVTKRenderWindowInteractor(mainWindow)
vtkWidget.GetRenderWindow().AddRenderer(renderer)
mainWindow.setCentralWidget(vtkWidget)

vtkWidget.GetRenderWindow().GetInteractor().Initialize()
timerId = vtkWidget.CreateRepeatingTimer(100)
vtkWidget.AddObserver("TimerEvent", onTimerEvent)

mainWindow.show()
app.exec_()

这个脚本应该一遍又一遍地显示tick"和tock"这两个词，但只要你在窗口内点击就停止.

This script should display the words "tick" and "tock" over and over again, but stop as soon as you click inside the window.

一个奇怪的行为是按T"切换到轨迹球交互方式似乎有一些效果.如果我按 T 并然后在窗口内单击，则计时器只会在我单击时停止运行:当我松开时它会再次启动.如果我然后按 J 返回操纵杆模式"，问题又回来了:点击永远停止计时器.

One odd behavior is that pressing "T" to switch to trackball interaction style seems to have some effect. If I press T and then click inside the window, the timer only stops running while I'm clicking: when I let go it starts up again. If I then press J to go back to "joystick mode", the problem returns: clicking stops the timer forever.

Python 3.6、VTK 8、Qt 5.

Python 3.6, VTK 8, Qt 5.

推荐答案

该问题在 Linux 16.04、VTK8.1.1 和 Qt5.5.1 中可重现.

The problem is reproducible in Linux 16.04, VTK8.1.1 and Qt5.5.1.

当您使用 Qt 时，解决问题的方法是使用 QTimer().如果您想使用时间，这是一个解决方案.

As you are using Qt, a workaround for your problem is to use QTimer(). It is a solution if you want to work with a timing.

这是更改 QTimer() 的 TimerEvent 的最小示例:

This is your minimal example changing the TimerEvent for QTimer():

import vtk
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from PyQt5 import Qt
from PyQt5.QtCore import QTimer

message = "tick"
def onTimerEvent():
    global message
    print(message)
    if message == "tick":
        message = "tock"
    else:
        message = "tick"

app = Qt.QApplication([])
mainWindow = Qt.QMainWindow()
renderer = vtk.vtkRenderer()
vtkWidget = QVTKRenderWindowInteractor(mainWindow)
vtkWidget.GetRenderWindow().AddRenderer(renderer)
mainWindow.setCentralWidget(vtkWidget)

vtkWidget.GetRenderWindow().GetInteractor().Initialize()
#timerId = vtkWidget.CreateRepeatingTimer(100)
#vtkWidget.AddObserver("TimerEvent", onTimerEvent)
timer = QTimer()
timer.timeout.connect(onTimerEvent)
timer.start(100)
mainWindow.show()
app.exec_()

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