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
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.