Method Pan

Interaction/Style/vtkInteractorStyleTrackballActor.cxx:365–413

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkInteractorStyleTrackballActor::Pan()
{
  if (this->CurrentRenderer == nullptr || this->InteractionProp == nullptr)
  {
    return;
  }

  vtkRenderWindowInteractor* rwi = this->Interactor;

  // Use initial center as the origin from which to pan

  double* obj_center = this->InteractionProp->GetCenter();

  double disp_obj_center[3], new_pick_point[4];
  double old_pick_point[4], motion_vector[3];

  this->ComputeWorldToDisplay(obj_center[0], obj_center[1], obj_center[2], disp_obj_center);

  this->ComputeDisplayToWorld(
    rwi->GetEventPosition()[0], rwi->GetEventPosition()[1], disp_obj_center[2], new_pick_point);

  this->ComputeDisplayToWorld(rwi->GetLastEventPosition()[0], rwi->GetLastEventPosition()[1],
    disp_obj_center[2], old_pick_point);

  motion_vector[0] = new_pick_point[0] - old_pick_point[0];
  motion_vector[1] = new_pick_point[1] - old_pick_point[1];
  motion_vector[2] = new_pick_point[2] - old_pick_point[2];

  if (this->InteractionProp->GetUserMatrix() != nullptr)
  {
    vtkTransform* t = vtkTransform::New();
    t->PostMultiply();
    t->SetMatrix(this->InteractionProp->GetUserMatrix());
    t->Translate(motion_vector[0], motion_vector[1], motion_vector[2]);
    this->InteractionProp->GetUserMatrix()->DeepCopy(t->GetMatrix());
    t->Delete();
  }
  else
  {
    this->InteractionProp->AddPosition(motion_vector[0], motion_vector[1], motion_vector[2]);
  }

  if (this->AutoAdjustCameraClippingRange)
  {
    this->CurrentRenderer->ResetCameraClippingRange();
  }

  rwi->Render();
}

//------------------------------------------------------------------------------
void vtkInteractorStyleTrackballActor::Dolly()