SelectedVerticesAndEdgesObserver
VTKExamples/Cxx/Graphs/SelectedVerticesAndEdgesObserver
Description¶
- Thanks to Eric Monson
Code¶
SelectedVerticesAndEdgesObserver.cxx
#include <vtkSmartPointer.h> #include <vtkCallbackCommand.h> #include <vtkAnnotationLink.h> #include <vtkRenderedGraphRepresentation.h> #include <vtkRenderer.h> #include <vtkDoubleArray.h> #include <vtkSelectionNode.h> #include <vtkIdTypeArray.h> #include <vtkSelection.h> #include <vtkRenderWindow.h> #include <vtkUnsignedCharArray.h> #include <vtkObjectFactory.h> #include <vtkGraphLayoutStrategy.h> #include <vtkGraphLayoutView.h> #include <vtkGraphWriter.h> #include <vtkMutableUndirectedGraph.h> #include <vtkRenderWindowInteractor.h> void SelectionCallbackFunction(vtkObject* caller, long unsigned int eventId, void* clientData, void* callData); int main(int, char *[]) { vtkSmartPointer<vtkMutableUndirectedGraph> g = vtkSmartPointer<vtkMutableUndirectedGraph>::New(); vtkIdType v1 = g->AddVertex(); vtkIdType v2 = g->AddVertex(); g->AddEdge(v1, v2); g->AddEdge(v1, v2); vtkSmartPointer<vtkCallbackCommand> selectionCallback = vtkSmartPointer<vtkCallbackCommand>::New(); selectionCallback->SetCallback (SelectionCallbackFunction); vtkSmartPointer<vtkGraphLayoutView> view = vtkSmartPointer<vtkGraphLayoutView>::New(); view->AddRepresentationFromInput(g); view->SetLayoutStrategy("Simple 2D"); view->GetRepresentation()->GetAnnotationLink()->AddObserver("AnnotationChangedEvent", selectionCallback); view->ResetCamera(); view->Render(); view->GetInteractor()->Start(); return EXIT_SUCCESS; } void SelectionCallbackFunction(vtkObject* caller, long unsigned int eventId, void* clientData, void* callData) { vtkAnnotationLink* annotationLink = static_cast<vtkAnnotationLink*>(caller); vtkSelection* selection = annotationLink->GetCurrentSelection(); vtkSelectionNode* vertices; vtkSelectionNode* edges; if(selection->GetNode(0)->GetFieldType() == vtkSelectionNode::VERTEX) { vertices = selection->GetNode(0); } else if(selection->GetNode(0)->GetFieldType() == vtkSelectionNode::EDGE) { edges = selection->GetNode(0); } if(selection->GetNode(1)->GetFieldType() == vtkSelectionNode::VERTEX) { vertices = selection->GetNode(1); } else if(selection->GetNode(1)->GetFieldType() == vtkSelectionNode::EDGE) { edges = selection->GetNode(1); } vtkIdTypeArray* vertexList = vtkIdTypeArray::SafeDownCast(vertices->GetSelectionList()); std::cout << "There are " << vertexList->GetNumberOfTuples() << " vertices selected." << std::endl; if(vertexList->GetNumberOfTuples() > 0) { std::cout << "Vertex Ids: "; } for(vtkIdType i = 0; i < vertexList->GetNumberOfTuples(); i++) { std::cout << vertexList->GetValue(i) << " "; } std::cout << std::endl; vtkIdTypeArray* edgeList = vtkIdTypeArray::SafeDownCast(edges->GetSelectionList()); std::cout << "There are " << edgeList->GetNumberOfTuples() << " edges selected." << std::endl; if(edgeList->GetNumberOfTuples() > 0) { std::cout << "Edge Ids: "; } for(vtkIdType i = 0; i < edgeList->GetNumberOfTuples(); i++) { std::cout << edgeList->GetValue(i) << " "; } std::cout << std::endl; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(SelectedVerticesAndEdgesObserver) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(SelectedVerticesAndEdgesObserver MACOSX_BUNDLE SelectedVerticesAndEdgesObserver.cxx) target_link_libraries(SelectedVerticesAndEdgesObserver ${VTK_LIBRARIES})
Download and Build SelectedVerticesAndEdgesObserver¶
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The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download SelectedVerticesAndEdgesObserver and its CMakeLists.txt file. Once the tarball SelectedVerticesAndEdgesObserver.tar has been downloaded and extracted,
cd SelectedVerticesAndEdgesObserver/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./SelectedVerticesAndEdgesObserver
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.