VTK/Examples/Cxx/Graphs/GraphToPolyData
From KitwarePublic
Jump to navigationJump to searchThis example creates a simple graph and then converts it to a polydata for visualization using Paraview.
Contents
GraphToPolyData.cxx
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkGraphToPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
// Create a graph
vtkSmartPointer<vtkMutableUndirectedGraph> g =
vtkSmartPointer<vtkMutableUndirectedGraph>::New();
// Add 4 vertices to the graph
vtkIdType v1 = g->AddVertex();
vtkIdType v2 = g->AddVertex();
vtkIdType v3 = g->AddVertex();
vtkIdType v4 = g->AddVertex();
// Add 3 edges to the graph
g->AddEdge ( v1, v2 );
g->AddEdge ( v1, v3 );
g->AddEdge ( v1, v4 );
// Create 4 points - one for each vertex
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
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, 1.0);
// Add the coordinates of the points to the graph
g->SetPoints(points);
// Convert the graph to a polydata
vtkSmartPointer<vtkGraphToPolyData> graphToPolyData =
vtkSmartPointer<vtkGraphToPolyData>::New();
graphToPolyData->SetInput(g);
graphToPolyData->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(graphToPolyData->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(.3, .6, .3); // Background color green
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
Please try the new VTKExamples website.
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(GraphToPolyData)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(GraphToPolyData MACOSX_BUNDLE GraphToPolyData.cxx)
if(VTK_LIBRARIES)
target_link_libraries(GraphToPolyData ${VTK_LIBRARIES})
else()
target_link_libraries(GraphToPolyData vtkHybrid vtkWidgets)
endif()
Download and Build GraphToPolyData
Click here to download GraphToPolyData. and its CMakeLists.txt file.
Once the tarball GraphToPolyData.tar has been downloaded and extracted,
cd GraphToPolyData/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:
./GraphToPolyData
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.