DirectedGraphToMutableDirectedGraph
Repository source: DirectedGraphToMutableDirectedGraph
Question
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Code¶
DirectedGraphToMutableDirectedGraph.cxx
#include <vtkDirectedGraph.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkNew.h>
#include <vtkPoints.h>
int main(int, char*[])
{
// create a graph
vtkNew<vtkMutableDirectedGraph> mdg;
// add 4 vertices to the graph
vtkIdType v1 = mdg->AddVertex();
vtkIdType v2 = mdg->AddVertex();
vtkIdType v3 = mdg->AddVertex();
vtkIdType v4 = mdg->AddVertex();
// add 3 edges to the graph
mdg->AddEdge(v1, v2);
mdg->AddEdge(v1, v3);
mdg->AddEdge(v1, v4);
// create 4 points - one for each vertex
vtkNew<vtkPoints> points;
points->InsertNextPoint(0.0, 0.0, 0.0);
points->InsertNextPoint(1.0, 0.0, 0.0);
points->InsertNextPoint(0.0, 1.0, 0.0);
points->InsertNextPoint(0.0, 0.0, 2.0);
// add the coordinates of the points to the graph
mdg->SetPoints(points);
std::cout << "MDG: " << std::endl;
std::cout << "Type: " << mdg->GetClassName() << std::endl;
std::cout << "Vertices: " << mdg->GetNumberOfVertices() << std::endl;
std::cout << "Edges: " << mdg->GetNumberOfEdges() << std::endl;
vtkNew<vtkDirectedGraph> dg;
if (!dg->CheckedShallowCopy(mdg))
{
std::cerr << "Could not convert graph to tree!" << std::endl;
return EXIT_FAILURE;
}
std::cout << "DG: " << std::endl;
std::cout << "Type: " << dg->GetClassName() << std::endl;
std::cout << "Vertices: " << dg->GetNumberOfVertices() << std::endl;
std::cout << "Edges: " << dg->GetNumberOfEdges() << std::endl;
vtkNew<vtkMutableDirectedGraph> mdg2;
if (!mdg2->CheckedShallowCopy(dg))
{
std::cerr << "Could not convert graph to tree!" << std::endl;
return EXIT_FAILURE;
}
std::cout << "MDG2: " << std::endl;
std::cout << "Type: " << mdg2->GetClassName() << std::endl;
std::cout << "Vertices: " << mdg2->GetNumberOfVertices() << std::endl;
std::cout << "Edges: " << mdg2->GetNumberOfEdges() << std::endl;
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(DirectedGraphToMutableDirectedGraph)
find_package(VTK COMPONENTS
CommonCore
CommonDataModel
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "DirectedGraphToMutableDirectedGraph: Unable to find the VTK build folder.")
endif()
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(DirectedGraphToMutableDirectedGraph MACOSX_BUNDLE DirectedGraphToMutableDirectedGraph.cxx )
target_link_libraries(DirectedGraphToMutableDirectedGraph PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS DirectedGraphToMutableDirectedGraph
MODULES ${VTK_LIBRARIES}
)
Download and Build DirectedGraphToMutableDirectedGraph¶
Click here to download DirectedGraphToMutableDirectedGraph and its CMakeLists.txt file. Once the tarball DirectedGraphToMutableDirectedGraph.tar has been downloaded and extracted,
cd DirectedGraphToMutableDirectedGraph/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:
./DirectedGraphToMutableDirectedGraph
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.