# AngleWidget2D

VTKExamples/Cxx/Widgets/AngleWidget2D

### Description

The arc is still visible?

### Code

AngleWidget2D.cxx

    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>
    #include <vtkAngleWidget.h>
    #include <vtkAngleRepresentation2D.h>

    int main(int /* argc */, char * /* argv */ [])
    {
      // 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);

      double pos1[3] = {50.0, 200.0, 0.0};
      double pos2[3] = {200.0, 20.0, 0.0};
      double center[3] = {100.0, 100.0, 0.0};
      vtkSmartPointer<vtkAngleRepresentation2D> rep =
        vtkSmartPointer<vtkAngleRepresentation2D>::New();
      rep->ArcVisibilityOff();

      vtkSmartPointer<vtkAngleWidget> angleWidget =
        vtkSmartPointer<vtkAngleWidget>::New();
      angleWidget->CreateDefaultRepresentation();
      angleWidget->SetRepresentation(rep);
      angleWidget->SetInteractor(renderWindowInteractor);

      renderWindow->Render();

      renderWindowInteractor->Initialize();
      renderWindow->Render();
      angleWidget->On();
      rep->SetPoint1DisplayPosition(pos1);
      rep->SetPoint2DisplayPosition(pos2);
      rep->SetCenterDisplayPosition(center);
      rep->Ray1VisibilityOn();
      rep->Ray2VisibilityOn();
      rep->ArcVisibilityOn();

      // Begin mouse interaction
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(AngleWidget2D)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(AngleWidget2D MACOSX_BUNDLE AngleWidget2D.cxx )

    target_link_libraries(AngleWidget2D ${VTK_LIBRARIES})

### Download and Build AngleWidget2D

Click here to download AngleWidget2D and its CMakeLists.txt file. Once the tarball AngleWidget2D.tar has been downloaded and extracted,

    cd AngleWidget2D/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:

    ./AngleWidget2D

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.