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# Cursor2D

VTKEx/Java/Visualization/Cursor2D

### Description

Example program to generate a 2D cursor representation. vtkCursor2D is a class that generates a 2D cursor representation. The cursor consists of two intersection axes lines that meet at the cursor focus.

Several optional features are available as well. An optional 2D bounding box may be enabled.

Other languages

See (Cxx)

Question

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### Code

Cursor2D.java

    import vtk.vtkActor;
    import vtk.vtkSphereSource;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkRenderWindow;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkRenderer;
    import vtk.vtkNamedColors;
    import vtk.vtkCursor2D;

    public class Cursor2D
    {
      // -----------------------------------------------------------------
      // Load VTK library and print which library was not properly loaded
      static
      {
        if (!vtkNativeLibrary.LoadAllNativeLibraries())
        {
          for (vtkNativeLibrary lib : vtkNativeLibrary.values())
          {
            if (!lib.IsLoaded())
            {
              System.out.println(lib.GetLibraryName() + " not loaded");
            }
          }
        }
        vtkNativeLibrary.DisableOutputWindow(null);
      }
      // -----------------------------------------------------------------

      public static void main(String s[])
      {
        vtkNamedColors colors = new vtkNamedColors();

        //For Actor Color
        double actorColor[] = new double[4];
        //For Cursor Actor Color
        double CursorActorColor[] = new double[4];
        //Renderer Background Color
        double Bgcolor[] = new double[4];

        colors.GetColor("Crimson", actorColor);
        colors.GetColor("White", CursorActorColor);
        colors.GetColor("CadetBlue", Bgcolor);

        //Create a Sphere
        vtkSphereSource Sphere = new vtkSphereSource();
        Sphere.SetCenter(0.0,0.0,0.0);
        Sphere.SetRadius(5.0);
        Sphere.Update();

        //Create a Mapper and Actor
        vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
        Mapper.SetInputConnection(Sphere.GetOutputPort());

        vtkActor Actor = new vtkActor();
        Actor.SetMapper(Mapper);
        Actor.GetProperty().SetColor(actorColor);

        // Create the renderer, render window and interactor.
        vtkRenderer ren = new vtkRenderer();
        vtkRenderWindow renWin = new vtkRenderWindow();
        renWin.AddRenderer(ren);
        vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
        iren.SetRenderWindow(renWin);

        // Visualise the Actor
        ren.AddActor(Actor);
        ren.SetBackground(Bgcolor);

        //Setup 2D cursor representation
        vtkCursor2D Cursor = new vtkCursor2D();
        Cursor.SetModelBounds(-10, 10, -10, 10, 0, 0);
        Cursor.AllOn();
        Cursor.SetFocalPoint(5.0, 5.0, 5.0);
        Cursor.OutlineOn();
        Cursor.Update();

        //Mapper for Cursor
        vtkPolyDataMapper CursorMapper = new vtkPolyDataMapper();
        CursorMapper.SetInputConnection(Cursor.GetOutputPort());

        //Cursor Actor
        vtkActor CursorActor = new vtkActor();
        CursorActor.SetMapper(CursorMapper);
        CursorActor.GetProperty().SetColor(CursorActorColor);
        ren.AddActor(CursorActor);

        ren.ResetCamera();
        iren.Start();

      }
    }