# TrackballCamera

VTKExamples/Java/Interaction/TrackballCamera

### Description

This example demonstrates the trackball camera mode. When the mouse is clicked and dragged from anywhere in the window, the camera is modified.

Contrast this with TrackballActor.

Other Languages

See (Cxx)

### Code

TrackballCamera.java

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

    public class TrackballCamera
    {
      // -----------------------------------------------------------------
      // 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 args[])
      {
        vtkNamedColors colors = new vtkNamedColors();

        //Renderer Background Color
        double Bgcolor[] = new double[4];

        colors.GetColor("SteelBlue", Bgcolor);

        // Create a sphere
        vtkSphereSource sphereSource = new vtkSphereSource();
        sphereSource.SetCenter(1.0, 0.0, 0.0 );
        sphereSource.Update();

        vtkPolyDataMapper sphereMapper  = new vtkPolyDataMapper();
        sphereMapper .SetInputData (sphereSource.GetOutput());

        vtkActor sphereActor = new vtkActor();
        sphereActor.SetMapper(sphereMapper);

        // Create a Cone
        vtkConeSource ConeSource = new vtkConeSource();

        vtkPolyDataMapper coneMapper = new vtkPolyDataMapper();
        coneMapper.SetInputConnection(ConeSource.GetOutputPort());

        vtkActor coneActor  = new vtkActor();
        coneActor.SetMapper(coneMapper);

        // 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
        ren.AddActor(sphereActor);
        ren.AddActor(coneActor);

        ren.SetBackground(Bgcolor);

        renWin.SetWindowName("Trackball Camera");
        renWin.SetSize(300, 300);
        renWin.Render();

        vtkInteractorStyleTrackballCamera style = new vtkInteractorStyleTrackballCamera();
        iren.SetInteractorStyle(style);

        iren.Initialize();
        iren.Start();
      }
    }