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# Vertex

VTKEx/Java/GeometricObjects/Vertex

### Description

Java Program to display a Vertex. The vertex is a primary zero-dimensional cell. It is defined by a single point.

Other languages

See (Cxx), (Python), (CSharp)

Question

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### Code

Vertex.java

    import vtk.vtkActor;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPoints;
    import vtk.vtkVertex;
    import vtk.vtkCellArray;
    import vtk.vtkPolyData;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkRenderWindow;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkRenderer;
    import vtk.vtkNamedColors;

    public class Vertex
    {
      //-----------------------------------------------------------------
      //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 Color = new vtkNamedColors();

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

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

        //Create a 3D Point
        vtkPoints Points = new vtkPoints();
        Points.InsertNextPoint(0.0,0.0,0.0);

        //Create A Vertex Which in turn represents a 3D point
        vtkVertex Vertex = new vtkVertex();
        Vertex.GetPointIds().SetId(0, 0);

        //Create a Cell Array -  a raw integer list that explicitly represents cell connectivity
        vtkCellArray Vertices = new vtkCellArray();
        Vertices.InsertNextCell(Vertex);

        //Create a PolyData  which represents a geometric structure
        //consisting of vertices, lines, polygons, and/or triangle strips
        vtkPolyData PolyData = new vtkPolyData();
        PolyData.SetPoints(Points);
        PolyData.SetVerts(Vertices);

        //Create a Mapper and Actor
        vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
        Mapper.SetInputData(PolyData);

        vtkActor Actor = new vtkActor();
        Actor.SetMapper(Mapper);
        Actor.GetProperty().SetPointSize(15);
        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 arrow
        ren.AddActor(Actor);
        ren.SetBackground(BgColor);

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

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