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
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.