AdjacentVertexIterator
VTKExamples/Cxx/Graphs/AdjacentVertexIterator
Description
The visualization in is example is currently broken. vtkGraphLayoutView does not currently allow coloring with a vtkUnsignedCharArray.
Code
AdjacentVertexIterator.cxx
#include <vtkMutableUndirectedGraph.h>
#include <vtkSmartPointer.h>
#include <vtkAdjacentVertexIterator.h>
#include <vtkUnsignedCharArray.h>
#include <vtkLookupTable.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkViewTheme.h>
#include <vtkDataSetAttributes.h>
#include <vtkGraphLayoutView.h>
// For compatibility with new VTK generic data arrays
#ifdef vtkGenericDataArray_h
#define InsertNextTupleValue InsertNextTypedTuple
#endif
int main(int, char *[])
{
vtkSmartPointer<vtkMutableUndirectedGraph> g =
vtkSmartPointer<vtkMutableUndirectedGraph>::New();
//create 3 vertices
vtkIdType v0 = g->AddVertex();
vtkIdType v1 = g->AddVertex();
vtkIdType v2 = g->AddVertex();
vtkIdType v3 = g->AddVertex();
//add edges
g->AddEdge(v0, v1);
g->AddEdge(v0, v2);
g->AddEdge(v2, v3);
// Create the color array
vtkSmartPointer<vtkUnsignedCharArray> vertexColors =
vtkSmartPointer<vtkUnsignedCharArray>::New();
vertexColors->SetNumberOfComponents(3);
vertexColors->SetName("color");
//setup colors
unsigned char red[3] = {255, 0, 0};
unsigned char green[3] = {0, 255, 0};
unsigned char blue[3] = {0, 0, 255};
for(unsigned int i = 0; i < 4; i++)
{
vertexColors->InsertNextTupleValue(blue);//not connected vertices
}
vtkSmartPointer<vtkAdjacentVertexIterator> iterator =
vtkSmartPointer<vtkAdjacentVertexIterator>::New();
g->GetAdjacentVertices(0, iterator);
vertexColors->SetTupleValue(0, red);//origin
while(iterator->HasNext())
{
vtkIdType nextVertex = iterator->Next();
std::cout << "Next vertex: " << nextVertex << std::endl;
vertexColors->SetTupleValue(nextVertex, green);//connected vertices
}
// Add the color array to the graph
g->GetVertexData()->AddArray(vertexColors);
vtkSmartPointer<vtkGraphLayoutView> graphLayoutView =
vtkSmartPointer<vtkGraphLayoutView>::New();
graphLayoutView->AddRepresentationFromInput(g);
graphLayoutView->SetLayoutStrategyToTree();
graphLayoutView->SetVertexColorArrayName("color");
graphLayoutView->ColorVerticesOn();
vtkSmartPointer<vtkViewTheme> theme =
vtkSmartPointer<vtkViewTheme>::New();
//theme->SetPointLookupTable(lookupTable);
theme->ScalePointLookupTableOff();
graphLayoutView->ApplyViewTheme(theme);
graphLayoutView->ResetCamera();
graphLayoutView->GetInteractor()->Initialize();
graphLayoutView->GetInteractor()->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(AdjacentVertexIterator)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(AdjacentVertexIterator MACOSX_BUNDLE AdjacentVertexIterator.cxx)
target_link_libraries(AdjacentVertexIterator ${VTK_LIBRARIES})
Download and Build AdjacentVertexIterator
Click here to download AdjacentVertexIterator and its CMakeLists.txt file. Once the tarball AdjacentVertexIterator.tar has been downloaded and extracted,
cd AdjacentVertexIterator/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:
./AdjacentVertexIterator
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.