NOVCAGraph
VTKExamples/Cxx/Graphs/NOVCAGraph
Description¶
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This example shows how to construct a graph to visualize it in ParaView/VisIt using the VTK output file testVertex.vtu.
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Contributed by Sanjaya Gajurel, Case Western Reserve University
Code¶
NOVCAGraph.cxx
#include <vtkVersion.h> #include <vtkCellArray.h> #include <vtkPoints.h> #include <vtkPolyLine.h> #include <vtkTriangle.h> #include <vtkXMLPolyDataWriter.h> #include <vtkPolyData.h> #include <vtkUnstructuredGrid.h> #include <vtkXMLUnstructuredGridWriter.h> #include <vtkSmartPointer.h> int main ( int, char *[] ) { // Create 8 Vertices. vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); for ( unsigned int i = 0; i < 2; ++i ) for ( unsigned int j = 0; j < 4; ++j ) points->InsertNextPoint( i, j, 0); //Create Edges vtkSmartPointer<vtkPolyLine> line = vtkSmartPointer<vtkPolyLine>::New(); line->GetPointIds()->SetNumberOfIds(8); for ( unsigned int i = 0; i < 8; ++i ) line->GetPointIds()->SetId(i,i); vtkSmartPointer<vtkCellArray> cellArray = vtkSmartPointer<vtkCellArray>::New(); cellArray->InsertNextCell(line); // Create a Graph with Vertices and Edges. vtkSmartPointer<vtkUnstructuredGrid> grid = vtkSmartPointer<vtkUnstructuredGrid>::New(); grid->SetPoints(points); grid->SetCells(VTK_POLY_LINE,cellArray); // Write the file vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer = vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New(); writer->SetFileName("testVertex.vtu"); #if VTK_MAJOR_VERSION <= 5 writer->SetInput(grid); #else writer->SetInputData(grid); #endif writer->Write(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(NOVCAGraph) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(NOVCAGraph MACOSX_BUNDLE NOVCAGraph.cxx) target_link_libraries(NOVCAGraph ${VTK_LIBRARIES})
Download and Build NOVCAGraph¶
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 Some tarballs may be missing or out-of-date.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 NOVCAGraph and its CMakeLists.txt file. Once the tarball NOVCAGraph.tar has been downloaded and extracted,
cd NOVCAGraph/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:
./NOVCAGraph
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.