# DistanceWidget

VTKExamples/Java/Widgets/DistanceWidget

### Description

The vtkDistanceWidget object is used to measure the distance between two points.

The two end points can be positioned independently, and when they are released, a special PlacePointEvent is invoked so that special operations may be take to reposition the point (snap to grid, etc.)

The widget has two different modes of interaction - when initially defined (i.e., placing the two points) and then a manipulate mode (adjusting the position of the two points).

Other Languages

See (Cxx)

### Code

DistanceWidget.java

    import vtk.vtkRenderWindow;
    import vtk.vtkNativeLibrary;
    import vtk.vtkNamedColors;
    import vtk.vtkRenderer;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkDistanceWidget;

    public class DistanceWidget
    {
      //-----------------------------------------------------------------
      // 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("DimGray", 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);

        vtkDistanceWidget DistanceWidget = new vtkDistanceWidget();
        DistanceWidget.SetInteractor(iren);
        DistanceWidget.CreateDefaultRepresentation();

        ren.SetBackground(Bgcolor);

        renWin.SetSize(300, 300);
        renWin.Render();
        DistanceWidget.On();
        iren.Initialize();
        iren.Start();

      }
    }