Legend
VTKExamples/Cxx/Visualization/Legend
Code¶
Legend.cxx
#include <vtkVersion.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkPolyData.h> #include <vtkCubeSource.h> #include <vtkSphereSource.h> #include <vtkLegendBoxActor.h> #include <vtkNamedColors.h> #include <vtkSmartPointer.h> int main (int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(0.0, 0.0, 0.0); sphereSource->SetRadius(5000.0); sphereSource->Update(); vtkPolyData* polydata = sphereSource->GetOutput(); // Create a mapper vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 mapper->SetInput(polydata); #else mapper->SetInputData(polydata); #endif // Create an actor vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkLegendBoxActor> legend = vtkSmartPointer<vtkLegendBoxActor>::New(); legend->SetNumberOfEntries(2); vtkSmartPointer<vtkNamedColors> colors = vtkSmartPointer<vtkNamedColors>::New(); double color[4]; vtkSmartPointer<vtkCubeSource> legendBox = vtkSmartPointer<vtkCubeSource>::New(); legendBox->Update(); colors->GetColor("tomato", color); legend->SetEntry(0, legendBox->GetOutput(), "Box", color); colors->GetColor("banana", color); legend->SetEntry(1, sphereSource->GetOutput(), "Ball", color); // place legend in lower right legend->GetPositionCoordinate()->SetCoordinateSystemToView(); legend->GetPositionCoordinate()->SetValue(.5, -1.0); legend->GetPosition2Coordinate()->SetCoordinateSystemToView(); legend->GetPosition2Coordinate()->SetValue(1.0, -0.5); legend->UseBackgroundOn(); double background[4]; colors->GetColor("warm_grey", background); legend->SetBackgroundColor(background); // Add the actors to the scene renderer->AddActor(actor); renderer->AddActor(legend); renderer->SetBackground(0,1,1); // Background color cyan // Render an image (lights and cameras are created automatically) renderWindow->Render(); // Begin mouse interaction renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Legend) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Legend MACOSX_BUNDLE Legend.cxx) target_link_libraries(Legend ${VTK_LIBRARIES})
Download and Build Legend¶
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 Legend and its CMakeLists.txt file. Once the tarball Legend.tar has been downloaded and extracted,
cd Legend/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:
./Legend
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.