ColorVerticesLookupTable
VTKExamples/Cxx/Graphs/ColorVerticesLookupTable
Code¶
ColorVerticesLookupTable.cxx
#include <vtkSmartPointer.h> #include <vtkPoints.h> #include <vtkDataSetAttributes.h> #include <vtkGraphLayoutView.h> #include <vtkIntArray.h> #include <vtkLookupTable.h> #include <vtkMutableDirectedGraph.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkViewTheme.h> #include <vtkRenderer.h> #include <vtkCamera.h> int main(int, char *[]) { // Create a graph vtkSmartPointer<vtkMutableDirectedGraph> graph = vtkSmartPointer<vtkMutableDirectedGraph>::New(); vtkIdType v1 = graph->AddVertex(); vtkIdType v2 = graph->AddVertex(); vtkIdType v3 = graph->AddVertex(); graph->AddEdge(v1,v2); graph->AddEdge(v2,v3); // Manually set the position of the vertices vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(0,0,0); points->InsertNextPoint(1,0,0); points->InsertNextPoint(2,0,0); graph->SetPoints(points); // Create the color array vtkSmartPointer<vtkIntArray> vertexColors = vtkSmartPointer<vtkIntArray>::New(); vertexColors->SetNumberOfComponents(1); vertexColors->SetName("Color"); vtkSmartPointer<vtkLookupTable> lookupTable = vtkSmartPointer<vtkLookupTable>::New(); lookupTable->SetNumberOfTableValues(3); lookupTable->SetTableValue(0, 1.0, 0.0, 0.0); // red lookupTable->SetTableValue(1, 1.0, 1.0, 1.0); // white lookupTable->SetTableValue(2, 0.0, 1.0, 0.0); // green lookupTable->Build(); vertexColors->InsertNextValue(0); vertexColors->InsertNextValue(1); vertexColors->InsertNextValue(2); // Add the color array to the graph graph->GetVertexData()->AddArray(vertexColors); // Visualize vtkSmartPointer<vtkGraphLayoutView> graphLayoutView = vtkSmartPointer<vtkGraphLayoutView>::New(); graphLayoutView->AddRepresentationFromInput(graph); graphLayoutView->SetLayoutStrategyToPassThrough(); graphLayoutView->SetVertexColorArrayName("Color"); graphLayoutView->ColorVerticesOn(); vtkSmartPointer<vtkViewTheme> theme = vtkSmartPointer<vtkViewTheme>::New(); theme->SetPointLookupTable(lookupTable); graphLayoutView->ApplyViewTheme(theme); graphLayoutView->ResetCamera(); graphLayoutView->GetInteractor()->Initialize(); graphLayoutView->GetRenderer()->GetActiveCamera()->Zoom(0.8); graphLayoutView->GetInteractor()->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ColorVerticesLookupTable) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ColorVerticesLookupTable MACOSX_BUNDLE ColorVerticesLookupTable.cxx) target_link_libraries(ColorVerticesLookupTable ${VTK_LIBRARIES})
Download and Build ColorVerticesLookupTable¶
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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 ColorVerticesLookupTable and its CMakeLists.txt file. Once the tarball ColorVerticesLookupTable.tar has been downloaded and extracted,
cd ColorVerticesLookupTable/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:
./ColorVerticesLookupTable
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.