// From http://www.vtk.org/Wiki/VTK/Examples/Cxx/Picking/CellPicking
void VtkCustomInteractorStyle::OnLeftButtonDown()
{
if (!_data)
return vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
if (_alternateMouseActions)
{
// Get the location of the click (in window coordinates)
int* pos = this->GetInteractor()->GetEventPosition();
vtkSmartPointer<vtkCellPicker> picker =
vtkSmartPointer<vtkCellPicker>::New();
picker->SetTolerance(0.0005);
// Pick from this location.
picker->Pick(pos[0], pos[1], 0, this->GetDefaultRenderer());
double* worldPosition = picker->GetPickPosition();
INFO("Cell id is: %d", picker->GetCellId());
if(picker->GetCellId() != -1)
{
INFO("Pick position is: %f %f %f", worldPosition[0], worldPosition[1], worldPosition[2]);
vtkSmartPointer<vtkIdTypeArray> ids =
vtkSmartPointer<vtkIdTypeArray>::New();
ids->SetNumberOfValues(1);
ids->SetValue(0, picker->GetCellId());
vtkSmartPointer<vtkSelectionNode> selectionNode =
vtkSmartPointer<vtkSelectionNode>::New();
selectionNode->SetFieldType(vtkSelectionNode::CELL);
selectionNode->SetContentType(vtkSelectionNode::INDICES);
selectionNode->SetSelectionList(ids);
vtkSmartPointer<vtkSelection> selection =
vtkSmartPointer<vtkSelection>::New();
selection->AddNode(selectionNode);
vtkSmartPointer<vtkExtractSelection> extractSelection =
vtkSmartPointer<vtkExtractSelection>::New();
extractSelection->SetInputData(0, _data);
extractSelection->SetInputData(1, selection);
extractSelection->Update();
// In selection
vtkSmartPointer<vtkUnstructuredGrid> selected =
vtkSmartPointer<vtkUnstructuredGrid>::New();
selected->ShallowCopy(extractSelection->GetOutput());
INFO("There are %d points in the selection.", selected->GetNumberOfPoints());
INFO("There are %d cells in the selection.", selected->GetNumberOfCells());
// check if the underlying object is a mesh and if so, send a signal to the element model for display of information about the picked element.
vtkAlgorithm* data_set = picker->GetActor()->GetMapper()->GetInputConnection(0, 0)->GetProducer()->GetInputConnection(0,0)->GetProducer();
vtkUnstructuredGridAlgorithm* source = dynamic_cast<vtkUnstructuredGridAlgorithm*>(data_set);
if (source)
emit elementPicked(source, static_cast<unsigned>(picker->GetCellId()));
else
emit clearElementView();
_selectedMapper->SetInputData(selected);
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->
AddActor(_selectedActor);
//_highlightActor = true;
}
else
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->
RemoveActor(_selectedActor);
emit requestViewUpdate();
}
else
// Forward events
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
}
// From http://www.vtk.org/Wiki/VTK/Examples/Cxx/Picking/CellPicking
void VtkCustomInteractorStyle::OnLeftButtonDown()
{
if (!Data)
return vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
if (_alternateMouseActions)
{
// Get the location of the click (in window coordinates)
int* pos = this->GetInteractor()->GetEventPosition();
vtkSmartPointer<vtkCellPicker> picker =
vtkSmartPointer<vtkCellPicker>::New();
picker->SetTolerance(0.0005);
// Pick from this location.
picker->Pick(pos[0], pos[1], 0, this->GetDefaultRenderer());
double* worldPosition = picker->GetPickPosition();
std::cout << "Cell id is: " << picker->GetCellId() << std::endl;
if(picker->GetCellId() != -1)
{
std::cout << "Pick position is: " << worldPosition[0] << " " <<
worldPosition[1]
<< " " << worldPosition[2] << endl;
vtkSmartPointer<vtkIdTypeArray> ids =
vtkSmartPointer<vtkIdTypeArray>::New();
ids->SetNumberOfComponents(1);
ids->InsertNextValue(picker->GetCellId());
vtkSmartPointer<vtkSelectionNode> selectionNode =
vtkSmartPointer<vtkSelectionNode>::New();
selectionNode->SetFieldType(vtkSelectionNode::CELL);
selectionNode->SetContentType(vtkSelectionNode::INDICES);
selectionNode->SetSelectionList(ids);
vtkSmartPointer<vtkSelection> selection =
vtkSmartPointer<vtkSelection>::New();
selection->AddNode(selectionNode);
vtkSmartPointer<vtkExtractSelection> extractSelection =
vtkSmartPointer<vtkExtractSelection>::New();
extractSelection->SetInput(0, this->Data);
extractSelection->SetInput(1, selection);
extractSelection->Update();
// In selection
vtkSmartPointer<vtkUnstructuredGrid> selected =
vtkSmartPointer<vtkUnstructuredGrid>::New();
selected->ShallowCopy(extractSelection->GetOutput());
std::cout << "There are " << selected->GetNumberOfPoints()
<< " points in the selection." << std::endl;
std::cout << "There are " << selected->GetNumberOfCells()
<< " cells in the selection." << std::endl;
// check if the underlying object is a mesh and if so, send a signal to the element model for display of information about the picked element.
vtkAlgorithm* data_set =
picker->GetActor()->GetMapper()->GetInputConnection(0,
0)->GetProducer()
->GetInputConnection(0,0)->GetProducer();
VtkMeshSource* source = dynamic_cast<VtkMeshSource*>(data_set);
if (source)
emit elementPicked(source->GetMesh(), picker->GetCellId());
selectedMapper->SetInputConnection(selected->GetProducerPort());
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->
AddActor(selectedActor);
}
else
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->
RemoveActor(selectedActor);
emit requestViewUpdate();
}
else
// Forward events
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
}