VTK/Examples/Cxx/Graphs/ColorVerticesLookupTable
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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;
}
Please try the new VTKExamples website.
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)
if(VTK_LIBRARIES)
target_link_libraries(ColorVerticesLookupTable ${VTK_LIBRARIES})
else()
target_link_libraries(ColorVerticesLookupTable vtkHybrid vtkWidgets)
endif()
Download and Build ColorVerticesLookupTable
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.