# WarpTo

VTKExamples/Java/Filtering/WarpTo

### Description

vtkWarpTo object is a filter that modifies point coordinates by moving the points towards a user specified position.

Other Languages

See (Cxx), (Python)

### Code

WarpTo.java

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

    public class WarpTo
    {

      //-----------------------------------------------------------------
      // 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();

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

        colors.GetColor("Silver", actorColor);
        colors.GetColor("MidnightBlue", Bgcolor);

        //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);

        //Create a line
        vtkLineSource LineSource = new vtkLineSource();
        LineSource.SetPoint1(0, 0, 0);
        LineSource.SetPoint2(0, 1, 0);
        LineSource.SetResolution(20);
        LineSource.Update();

        //Create a tube (cylinder) around the line
        vtkTubeFilter TubeFilter = new vtkTubeFilter();
        TubeFilter.SetInputConnection(LineSource.GetOutputPort());
        TubeFilter.SetRadius(0.01);
        TubeFilter.SetNumberOfSides(50);
        TubeFilter.Update();

        vtkWarpTo WarpTo = new vtkWarpTo();
        WarpTo.SetInputConnection(TubeFilter.GetOutputPort());
        WarpTo.SetPosition(10, 1, 0);
        WarpTo.SetScaleFactor(5);
        WarpTo.AbsoluteOn();

        //Create a Mapper and Actor
        vtkPolyDataMapper mapper = new vtkPolyDataMapper();
        mapper.SetInputConnection(WarpTo.GetOutputPort());
        mapper.ScalarVisibilityOff();

        vtkActor actor = new vtkActor();
        actor.SetMapper(mapper);
        actor.GetProperty().SetColor(actorColor);

        ren.AddActor(actor);
        ren.SetBackground(Bgcolor);

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

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