[vtkusers] Coordinates of the point clicked with the mouse

[Naim]

Hi Florent,

 

Juste call OnLeftClick ( or YourOnLeftClickFunctionName) function using
vtkCallbackCommand class (subject/observer design pattern) :

 

void Init()

{

      vtkCallbackCommand* cbc = vtkCallbackCommand::New();

      cbc->SetCallback(OnLeftClick);

      cbc->SetClientData((void*) renderer->GetActiveCamera());

      iren->AddObserver(vtkCommand::LeftButtonPressEvent, cbc); // left
button clicked

      cbc->Delete();

}

 

void OnLeftClick(vtkObject* caller, unsigned long eid, void* clientdata,
void* calldata)

{

      vtkPointPicker *pointpicker = vtkPointPicker::New();

      pointpicker->SetTolerance(0.001);

      iren->SetPicker(pointpicker);

 

//get the picker handle from the interactor

      vtkPointPicker  *pointpicker = (vtkPointPicker *)(iren->GetPicker());

            

      //get the mouse position

      int * pos = iren->GetEventPosition();

 

      //start the picking process

      if ( pointpicker->Pick((double)pos[0], (double)pos[1], 0.0,
m_prenderer) != 0)

      {

            //get the list of picked point

            vtkPoints* thePointList = pointpicker->GetPickedPositions();

 

            //get the number of picked points

            int nbrpoints = thePointList->GetNumberOfPoints();

                        

            if (nbrpoints<=0)

                  return;     

}

...

}

 

PS: YourOnLeftClickFunctionName function must be static.

 

Naim Himrane

Electromagneticworks Inc.

 

  _____  

From: Florent Chandelier [mailto:Florent.Chandelier at USherbrooke.ca] 
Sent: November 30, 2006 11:02 AM
To: Naim
Cc: cyros at tiscali.it; vtkusers at vtk.org
Subject: Re: [vtkusers] Coordinates of the point clicked with the mouse

 

Hi, 

When you say, "on left click", do you mean you have created an instance (a
class) performing a special task on a left click or do you simply paste the
code like that ?

regards,
Florent.

Naim wrote: 

I’m using this to get the coordinates (OnLeftClick):

 

 

vtkPointPicker  *pointpicker = (vtkPointPicker *)(iren->GetPicker());

            

//get the mouse position

int * pos = iren->GetEventPosition();

 

pointpicker->SetTolerance(0.001);

 

//start the picking process

if ( pointpicker->Pick((double)pos[0], (double)pos[1], 0.0, m_prenderer) !=
0)

{

      //get the list of picked point

      vtkPoints* thePointList = pointpicker->GetPickedPositions();

 

      //get the number of picked points

      int nbrpoints = thePointList->GetNumberOfPoints();

}

 

Naim Himrane

Electromagneticworks Inc.

 

  _____  

From: vtkusers-bounces+naim=electromagneticworks.com at vtk.org
[mailto:vtkusers-bounces+naim=electromagneticworks.com at vtk.org] On Behalf Of
cyros at tiscali.it
Sent: November 29, 2006 7:06 PM
To: vtkusers at vtk.org
Subject: [vtkusers] Coordinates of the point clicked with the mouse 

 

 

Which it is the alternative way to vtkRenderWindow.GetEventPosition () for
having the coordinates of the point clicked with the mouse on the
vtkRenderWindow?

 





  _____  



 
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-- 



Florent Chandelier, PhD candidate

Master's in Medical Imaging (Medicine Faculty, Paris, France), 

French Engineer in Signal treatment and theory (ESME SUDRIA, Paris, France)

 

Local C1-4123  

 

Département de génie mécanique

Université de Sherbrooke

2500, boul. Université

Sherbrooke, QC, J1K 2R1

CANADA

 

Tel      : +1 (819) 821-8000 ext: 63160

Fax      : +1 (819) 821-7163

E-mail   : Florent.Chandelier at USherbrooke.ca

 


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