[vtkusers] Instructions to implement 3D Space Navigator support with VTK

[Wagner Sales]

Hi all,

I need to implement 3DConnexion Space Navigator support in my VTK
application. To know a little bit more, this device are used to control 3D
navigation in a scheme, like rotation, zooming, move and others.
I read an old post in the list, but no answers are returned. I was read the
VTK interactor and relative classes (interactorStyle,
vtkXRenderWindowInteractor ) to try to understand how to implement this, but
without success.
Since I'm using X11, this device will send to me a ClientMessage XEvent
type, with the data about move position or button click. I'm current
handling this in Qt, without problems ( the code are at the end to
illustrate better what's I need to do). Now, I need to do in VTK, but I'm a
little bit confused about wich class(es) I need to re implement or inherits
to give this support. vtkRenderWindowInteractor? vtkInteractorStyle? Or
something completely new?
I know this classes are changing from VTK 5.0 to 5.2, and I'm using VTK
5.0.4.

Can someone helps and put me in the correct way?

Thks in advance!


Wagner Sales


The Qt code to handle the event:
bool QtSpaceNavigatorWidget::x11Event(XEvent *event)
{
    MagellanFloatEvent MagellanEvent;
    double MagellanSensitivity = 1.0;
    Display *display = QX11Info::display();
    {
        if(!display)
        {
            qDebug() << "Cannot open display!" << endl;
        }
    }
    if ( !MagellanInit( display, winId() ) )
      {
           qDebug() << "No Space Navigator driver exists";
           return false;
      };

   switch (event->type)
   {
    case ClientMessage:
          switch( MagellanTranslateEvent( display, event, &MagellanEvent,
1.0, 1.0 ) )
           {
            case MagellanInputMotionEvent :
                 MagellanRemoveMotionEvents( display );
            // now we will be set the values from Space Navigator on the
text labels
            xvalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanX ]));
            yvalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanY ]));
            zvalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanZ ]));
            avalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanA ]));
            bvalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanB ]));
            cvalue->setText(QString::number(MagellanEvent.MagellanData[
MagellanC ]));
            return false;

            break;

            case MagellanInputButtonPressEvent :
                 qDebug() << "MagellanInputButtonPressEvent called" << endl;

                 switch ( MagellanEvent.MagellanButton )
                  {
                       case 5: MagellanApplicationSensitivity( display,
MagellanSensitivity / 2.0 ); break;
                       case 6: MagellanApplicationSensitivity( display,
MagellanSensitivity * 2.0 ); break;
                       case 7: MagellanApplicationSensitivity(
display, 1.0); break;
                  };

                 switch( MagellanEvent.MagellanButton )
                  {
                       case 5: MagellanSensitivity = MagellanSensitivity <=
1.0/32.0 ? 1.0/32.0 : MagellanSensitivity/2.0; break;
                       case 6: MagellanSensitivity = MagellanSensitivity >=
32.0 ? 32.0 : MagellanSensitivity*2.0; break;
                       case 7: MagellanSensitivity = 1.0;  break;
                  };
            switch( MagellanEvent.MagellanButton )
                  {
                       case 5:
                       case 6:
                       case 7:
                           printf("Application Sensitivity = %lf \n",
MagellanSensitivity );
                       break;
                  };
        return false;
            break;

            case MagellanInputButtonReleaseEvent :
                 qDebug() << "MagellanInputButtonPressEvent called" << endl;
        return false;
             break;
    }
    default:
    return false;
    break;
    }
    return false;

}
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