1
我想连接一个VTK回调到Qt插槽，所以当回调发生时，插槽将被触发。连接一个VTK回调Qt插槽
我正在使用QVTKWidget来呈现已添加到PCLVisualizer（来自点云库PCL）的点云。
让我们展示一些代码：
PointCloud.h
class PointCloud: public QObject {
Q_OBJECT
private:
static void loadStartCallback(
vtkObject *caller,
unsigned long eventId,
void *clientData,
void *callData
);
static void loadEndCallback(
vtkObject *caller,
unsigned long eventId,
void *clientData,
void *callData
);
void load(void);
// more funcs and methods
private:
QVTKWidget* widget;
pcl::visualization::PCLVisualizer* visualizer;
unsinged long observerStartTag;
unsinged long observerEndTag;
// more attributes
}
PointCloud.cpp
void PointCloud::loadStartCallback(
vtkObject* caller,
unsigned long eventId,
void* clientData,
void* callData
) {
qDebug() << "\t\tPointCloud - loadCallback started\n";
if(clientData) {
PointCloud* self = reinterpret_cast<PointCloud*>(clientData);
self->widget->GetRenderWindow()->RemoveObserver(self->observerStartTag);
}
void PointCloud::loadEndCallback(
vtkObject* caller,
unsigned long eventId,
void* clientData,
void* callData
) {
qDebug() << "\t\tPointCloud - loadCallback ended\n";
if(clientData) {
PointCloud* self = reinterpret_cast<PointCloud*>(clientData);
self->widget->GetRenderWindow()->RemoveObserver(self->observerEndTag);
}
}
void load(void) {
vtkSmartPointer<vtkRenderWindow> renderWindow = visualizer->getRenderWindow();
vtkSmartPointer<vtkCallbackCommand> startCallback = vtkSmartPointer<vtkCallbackCommand>::New();
startCallback->SetCallback(loadStartCallback);
startCallback->SetClientData(this);
observerStartTag = renderWindow->AddObserver(vtkCommand::StartEvent, startCallback);
vtkSmartPointer<vtkCallbackCommand> endCallback = vtkSmartPointer<vtkCallbackCommand>::New();
endCallback->SetCallback(loadEndCallback);
endCallback->SetClientData(this);
observerEndTag = renderWindow->AddObserver(vtkCommand::EndEvent, endCallback);
// more processing. local_cloud is already populated
// and functional at this point
widget->SetRenderWindow(renderWindow);
visualizer->addPointCloud<pcl::PointXYZ>(local_cloud, "local_cloud");
widget->Show();
widget->Update();
}
这种运作良好，一旦云渲染开始时，点云 - 打印loadCallback开始打印并w当渲染结束并显示云时，消息PointCloud - loadCallback结束被打印。
现在，除了打印结束消息之外，我还想触发Qt插槽。我试图使用vtkEventQtSlotConnect类是，因为它似乎是回调连接插槽正确的选择：在PointCloud.h
private slots:
void test(void);
新的PointCloud.cpp
新
void PointCloud::test(void) { qDebug() << "\t\tThis is a test\n; }
添加入点云::负载（），在调用之前visualizer-> addPointCloud
vtkEventQtSlotConnect* vtk_qt_connector = vtkEventQtSlotConnect::New();
vtk_qt_connector->Connect(
renderWindow,
vtkCommand::EndEvent,
this,
SLOT(test(void)),
0,
1.0
);
// AFTER widget->Update()
vtk_qt_connector->Disconnect(); // NO PARAM: disconnects ALL slots
vtk_qt_connector->Delete();
} // End of PointCloud::load()
有了这些添加，在回调的消息被打印出来，但从未示出的test()槽内的消息。
任何想法我做错了什么？
编辑
在VTK例子回调，我已经看到，一个vtkRendeWindowInteractor用于管理回调。但是，如果我将回调观察者添加到它，它不如直接将其添加到渲染窗口准确。