LabelVerticesAndEdges
VTKExamples/Cxx/Graphs/LabelVerticesAndEdges
Description¶
This example sets and displays labels of vertices and edges of a graph.
Code¶
LabelVerticesAndEdges.cxx
#include <vtkSmartPointer.h> #include <vtkCircularLayoutStrategy.h> #include <vtkDataSetAttributes.h> #include <vtkDoubleArray.h> #include <vtkGraphLayoutView.h> #include <vtkIntArray.h> #include <vtkMutableUndirectedGraph.h> #include <vtkRenderWindowInteractor.h> int main(int, char *[]) { vtkSmartPointer<vtkMutableUndirectedGraph> g = vtkSmartPointer<vtkMutableUndirectedGraph>::New(); // Create 3 vertices vtkIdType v1 = g->AddVertex(); vtkIdType v2 = g->AddVertex(); vtkIdType v3 = g->AddVertex(); // Create a fully connected graph g->AddEdge(v1, v2); g->AddEdge(v2, v3); g->AddEdge(v1, v3); // Create the edge weight array vtkSmartPointer<vtkDoubleArray> weights = vtkSmartPointer<vtkDoubleArray>::New(); weights->SetNumberOfComponents(1); weights->SetName("Weights"); // Set the edge weights weights->InsertNextValue(1.0); weights->InsertNextValue(1.0); weights->InsertNextValue(2.0); // Create an array for the vertex labels vtkSmartPointer<vtkIntArray> vertexIDs = vtkSmartPointer<vtkIntArray>::New(); vertexIDs->SetNumberOfComponents(1); vertexIDs->SetName("VertexIDs"); // Set the vertex labels vertexIDs->InsertNextValue(0); vertexIDs->InsertNextValue(1); vertexIDs->InsertNextValue(2); // Add the edge weight array to the graph g->GetEdgeData()->AddArray(weights); g->GetVertexData()->AddArray(vertexIDs); vtkSmartPointer<vtkCircularLayoutStrategy> circularLayoutStrategy = vtkSmartPointer<vtkCircularLayoutStrategy>::New(); vtkSmartPointer<vtkGraphLayoutView> graphLayoutView = vtkSmartPointer<vtkGraphLayoutView>::New(); graphLayoutView->AddRepresentationFromInput(g); graphLayoutView->SetLayoutStrategy(circularLayoutStrategy); graphLayoutView->SetVertexLabelVisibility(true); graphLayoutView->SetEdgeLabelVisibility(true); graphLayoutView->SetEdgeLabelArrayName("Weights"); //default is "labels" graphLayoutView->SetVertexLabelArrayName("VertexIDs"); //default is "labels" graphLayoutView->ResetCamera(); graphLayoutView->Render(); graphLayoutView->GetInteractor()->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(LabelVerticesAndEdges) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(LabelVerticesAndEdges MACOSX_BUNDLE LabelVerticesAndEdges.cxx) target_link_libraries(LabelVerticesAndEdges ${VTK_LIBRARIES})
Download and Build LabelVerticesAndEdges¶
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Click here to download LabelVerticesAndEdges and its CMakeLists.txt file. Once the tarball LabelVerticesAndEdges.tar has been downloaded and extracted,
cd LabelVerticesAndEdges/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:
./LabelVerticesAndEdges
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.