# TubeFilter

VTKExamples/Java/PolyData/TubeFilter

### Description

This example creates a tube around a line. This is helpful because when you zoom the camera, the thickness of a line remains constant, while the thickness of a tube varies.

Other Languages

See (Cxx)

### Code

TubeFilter.java

    import vtk.vtkActor;
    import vtk.vtkNativeLibrary;
    import vtk.vtkLineSource;
    import vtk.vtkTubeFilter;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkRenderWindow;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkRenderer;
    import vtk.vtkNamedColors;

    public class TubeFilter
    {
      // -----------------------------------------------------------------
      // 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[])
      {
        /*
                * This example creates a tube around a line.
                * This is helpful because when you zoom the camera,
                * the thickness of a line remains constant,
                * while the thickness of a tube varies.
                * */

        vtkNamedColors Color = new vtkNamedColors();
        //For Actor
        double ActorColor[] = new double[4];
        //Renderer Background Color
        double BgColor[] = new double[4];

        //Change Color Name to Use your own Color for Actor
        Color.GetColor("Red",ActorColor);
        //Change Color Name to Use your own Color for Renderer Background
        Color.GetColor("Gray",BgColor);

        // Create a line
        vtkLineSource LineSource = new vtkLineSource();
        LineSource.SetPoint1(1.0, 0.0, 0.0);
        LineSource.SetPoint2(.0, 1.0, 0.0);

        // Create a mapper and actor
        vtkPolyDataMapper LineMapper = new vtkPolyDataMapper();
        LineMapper.SetInputConnection(LineSource.GetOutputPort());

        vtkActor LineActor = new vtkActor();
        LineActor.SetMapper(LineMapper);
        LineActor.GetProperty().SetColor(ActorColor);
        LineActor.GetProperty().SetLineWidth(3);

        vtkTubeFilter TubeFilter = new vtkTubeFilter();
        TubeFilter.SetInputConnection(LineSource.GetOutputPort());
        TubeFilter.SetRadius(0.025);
        TubeFilter.SetNumberOfSides(50);
        TubeFilter.Update();

        vtkPolyDataMapper TubeMapper = new vtkPolyDataMapper();
        TubeMapper.SetInputConnection(TubeFilter.GetOutputPort());

        vtkActor TubeActor = new vtkActor();
        TubeActor.SetMapper(TubeMapper);
        //Make the tube have some transparency.
        TubeActor.GetProperty().SetOpacity(0.5);

        // 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 arrow
        ren.AddActor(LineActor);
        ren.AddActor(TubeActor);
        ren.SetBackground(BgColor);
        ren.ResetCamera();

        renWin.SetSize(300,300);
        renWin.Render();

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