[vtkusers] vtkCallbackCommand in ActiveViz

[Jochen K.]

Hi Dieter,

as so often an example is worth a thousand words:
      private void InteractorStyleUser() {
         // Create a sphere.  
         vtkSphereSource sphereSource = vtkSphereSource.New();
         sphereSource.SetRadius(0.5);
         
         // retrieve renderWindow from our renderWindowControl
         vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;

         // define interactorStyle of type vtkInteractorStyleUser
         vtkInteractorStyleUser interactorStyleUser =
vtkInteractorStyleUser.New();

         // tell renderWindow to use our own interactorStyle
        
renderWindow.GetInteractor().SetInteractorStyle(interactorStyleUser);

         // define eventhandler
         interactorStyleUser.LeftButtonPressEvt += new
vtkObject.vtkObjectEventHandler(interactorStyleUser_LeftButtonPressEvt);
         interactorStyleUser.LeftButtonReleaseEvt += new
vtkObject.vtkObjectEventHandler(interactorStyleUser_LeftButtonReleaseEvt);
         interactorStyleUser.KeyPressEvt += new
vtkObject.vtkObjectEventHandler(interactorStyleUser_KeyPressEvt);
         /* here you can define more eventhandler
            all available eventhandler are marked in Intellisense with a
lightning symbol

            to create the handler type for instance 

               interactorStyleUser.RightButtonPressEvt+=

            and then press the tab key
          
            the eventhandler method is being created automatically
         */

         // mapper
         vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
         mapper.SetInputConnection(sphereSource.GetOutputPort());

         // actor
         vtkActor actor = vtkActor.New();
         actor.SetMapper(mapper);
         vtkRenderer renderer =
renderWindow.GetRenderers().GetFirstRenderer();
         renderer.SetBackground(0.3, 0.2, 0.1);
         renderer.AddActor(actor);
      }


      void interactorStyleUser_KeyPressEvt(vtkObject sender,
vtkObjectEventArgs e) {
         vtkInteractorStyleUser style = vtkInteractorStyleUser.New();
         style = (vtkInteractorStyleUser)e.Caller;
         int keyCode = style.GetChar();
         string keySym = style.GetKeySym();
         bool IsShiftKeyPressed = ( style.GetShiftKey() == 1 ? true : false
);
         bool IsCtrlKeyPressed = ( style.GetCtrlKey() == 1 ? true : false );
         Debug.WriteLine("keyCode: " + keyCode);
         Debug.WriteLine("keySym: " + keySym);
         Debug.WriteLine("shift key: " + IsShiftKeyPressed);
         Debug.WriteLine("ctrl key: " + IsCtrlKeyPressed);
      }


      void interactorStyleUser_LeftButtonReleaseEvt(vtkObject sender,
vtkObjectEventArgs e) {
         vtkInteractorStyleUser caller = vtkInteractorStyleUser.New();
         caller = (vtkInteractorStyleUser)e.Caller;
         int[] mousePosition = caller.GetLastPos();
         Debug.WriteLine("left mouse button released -> mouse position: "
+ mousePosition[0] + " " + mousePosition[1]);
      }


      void interactorStyleUser_LeftButtonPressEvt(vtkObject sender,
vtkObjectEventArgs e) {
         vtkInteractorStyleUser caller = vtkInteractorStyleUser.New();
         caller = (vtkInteractorStyleUser)e.Caller;
         int[] mousePosition = caller.GetLastPos();
         Debug.WriteLine("left mouse button pressed -> mouse position: "
+ mousePosition[0] + " " + mousePosition[1]);
      }




> And does anyone know if there is an official replacement for the factory

>

>    vtkStandardNewMacro(InteractorStyle)

>

> I was using a simple static New here, which works, but probably is not
> dogmatic.



There is no replacement in C# for vtkStandardNewMacro(...)


In C# it's just fine to instantiate a class the way you doing it:

vtkObject myObject = vtkObject.New();


Note: All classes  are static, that's the reason why you cannot inherit from
any wrapped vtk class.

         But as I learned a few days ago there's a way to extent a static
class.

         If you like I can show you how to do that.


with best regards

Jochen

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