GraphAlgorithmFilter
VTKExamples/Cxx/Developers/GraphAlgorithmFilter
Description¶
This example demonstrates how to create a filter that takes a vtkGraph as input and produces a vtkGraph as output.
Code¶
GraphAlgorithmFilter.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkGraph.h> #include <vtkMutableUndirectedGraph.h> #include <vtkMutableDirectedGraph.h> #include "vtkTestGraphAlgorithmFilter.h" void TestDirected(); void TestUndirected(); int main(int, char *[]) { TestDirected(); TestUndirected(); return EXIT_SUCCESS; } void TestDirected() { vtkSmartPointer<vtkMutableDirectedGraph> g = vtkSmartPointer<vtkMutableDirectedGraph>::New(); vtkIdType v1 = g->AddVertex(); vtkIdType v2 = g->AddVertex(); g->AddEdge(v1, v2); std::cout << "Input type: " << g->GetClassName() << std::endl; vtkSmartPointer<vtkTestGraphAlgorithmFilter> filter = vtkSmartPointer<vtkTestGraphAlgorithmFilter>::New(); #if VTK_MAJOR_VERSION <= 5 filter->SetInput(g); #else filter->SetInputData(g); #endif filter->Update(); std::cout << "Output type: " << filter->GetOutput()->GetClassName() << std::endl; std::cout << "Output has " << filter->GetOutput()->GetNumberOfVertices() << " vertices." << std::endl; std::cout << std::endl; } void TestUndirected() { std::cout << "TestUndirected" << std::endl; vtkSmartPointer<vtkMutableUndirectedGraph> g = vtkSmartPointer<vtkMutableUndirectedGraph>::New(); vtkIdType v1 = g->AddVertex(); vtkIdType v2 = g->AddVertex(); g->AddEdge(v1, v2); std::cout << "Input type: " << g->GetClassName() << std::endl; vtkSmartPointer<vtkTestGraphAlgorithmFilter> filter = vtkSmartPointer<vtkTestGraphAlgorithmFilter>::New(); #if VTK_MAJOR_VERSION <= 5 filter->SetInput(g); #else filter->SetInputData(g); #endif filter->Update(); std::cout << "Output type: " << filter->GetOutput()->GetClassName() << std::endl; std::cout << "Output has " << filter->GetOutput()->GetNumberOfVertices() << " vertices." << std::endl; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(GraphAlgorithmFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(GraphAlgorithmFilter MACOSX_BUNDLE GraphAlgorithmFilter.cxx) target_link_libraries(GraphAlgorithmFilter ${VTK_LIBRARIES})
Download and Build GraphAlgorithmFilter¶
Danger
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 Some tarballs may be missing or out-of-date.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 GraphAlgorithmFilter and its CMakeLists.txt file. Once the tarball GraphAlgorithmFilter.tar has been downloaded and extracted,
cd GraphAlgorithmFilter/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:
./GraphAlgorithmFilter
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.