[vtkusers] QVTKWidget

[Moinier, Pierre (UK)]

Hi!
 
I am trying to get signal and slot work with QVTK. I have 2 threads, one
to compute and one to do the rendering. When the compute thread sends a
signal, I want this one to be picked up in order to update the scene. In
my visualisation widget I call initialView which creates a sphere. The
result is that as the compute threads is running, the sphere is being
rendered. However, When a signal is emited, this one is not picked up.
If I replace initialView with another member which does nothing, the
signal is being delivered. So my guess is that the vtkRenderWindow is
overwritting my original Widget, perhaps  with a different eventloop...
In fact, the window title is even reset to 'Visualisation toolkit -
openGL" when I use initialView, whereas I get the correct Window title
that I set in the constructor when I use the empty member... but with
nothing in the window.
 
Could anyone tell me what I am doing wrong? I guess the best thing is to
give some lines of codes...
 
Best Regards,
 
    -Pierre.
 
main.cpp:
 
#include <QApplication>
#include "MyWidget.h"
int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  MyWidget* widget;
  widget = new MyWidget(argc, argv);
  widget->show();
  return app.exec();
}
------------------------------------------------------------------------
-----
MyWidget.h
 
#include <QWidget>
#include <QVTKWidget.h>
#include "computethread.h"
 
class MyWidget : public QVTKWidget
{
  Q_OBJECT
 public:
  MyWidget(int argc, char **argv, QVTKWidget *parent = 0);
  QSize minimumSizeHint() const;
  QSize sizeHint() const;
private slots:
  void updateView();
private:
  ComputeThread* thread;
  void initialView();
  void initialView2();
  QVTKWidget *vtkwidget;
};
------------------------------------------------------------------------
-----
MyWidget.cpp
 
MyWidget::MyWidget(int argc, char **argv, QVTKWidget *parent) :
QVTKWidget(parent)
{
 
  // start compute thread
  thread = new ComputeThread(argc,argv);
  thread->start(); 
 
  initialView();
  setWindowTitle(tr("Visualization Window - v0.1"));
  resize(400, 300);
  connect(thread, SIGNAL(computeStuff()), this, SLOT(updateView()));
}
void MyWidget::initialView2()
{
}
void MyWidget::initialView()
{
  //create a rendering window and renderer
  vtkRenderer *ren = vtkRenderer::New();
  vtkRenderWindow *renderWindow = vtkRenderWindow::New();
  renderWindow->AddRenderer( ren );
  renderWindow->SetSize( 500, 500 );
 
  //Create a window interactor
  vtkRenderWindowInteractor *interactor =
vtkRenderWindowInteractor::New();
  interactor->SetRenderWindow( renderWindow );
 
  //create and actor and give it ball geometry
 
  vtkSphereSource* Sphere = vtkSphereSource::New();
  Sphere->SetCenter(0.0, 0.0, 0.0);
  Sphere->SetRadius(5.0);
 
  //create a mapper
  vtkPolyDataMapper *Mapper = vtkPolyDataMapper::New();
  Mapper->SetInput(Sphere->GetOutput());
 
  // create an actor
  vtkActor *Actor = vtkActor::New();
  Actor->SetMapper(Mapper);
  // sphere color blue
  Actor->GetProperty()->SetColor(0,0,1);
 
  //assign our actor to the renderer
  ren->AddActor(Actor);
 
  renderWindow->AddRenderer(ren);
 
  //render the scene and start the interactor
  renderWindow->Render();
  interactor->Start();
 
  vtkwidget->SetRenderWindow(renderWindow);
  renderWindow->Delete();
}

 
 

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