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
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.