# Line

VTKExamples/Java/GeometricObjects/Line

### Description

The line is a primary one-dimensional cell. It is defined by two points. The direction along the line is from the first point to the second point.

Other Languages

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

### Code

Line.java

    import java.awt.BorderLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.SwingUtilities;
    import vtk.vtkActor;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPanel;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkLineSource;

    //Author: Bharatesh Chakravarthi
    //Affiliation: VE Lab, Chung Ang University, Seoul, South Korea.

    public class Line extends JPanel implements ActionListener
    {
      private static final long serialVersionUID = 1L;
      private vtkPanel renWin;
      private JButton exitButton;

      // -----------------------------------------------------------------
      // 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 Line()
      {
        super(new BorderLayout());
        double p0[] = new double[] {1.0,0.0,0.0};
        double p1[] = new double[] {0.0,1.0,0.0};

        //Create a Line
        vtkLineSource LineSource = new vtkLineSource();
        LineSource.SetPoint1(p0);
        LineSource.SetPoint1(p1);

        //Create a Mapper and Actor
        vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
        Mapper.SetInputConnection(LineSource.GetOutputPort());

        vtkActor Actor = new vtkActor();
        Actor.SetMapper(Mapper);
        Actor.GetProperty().SetColor(0.0, 0.5, 0.5);
        Actor.GetProperty().SetLineWidth(5);

        renWin = new vtkPanel();
        renWin.GetRenderer().AddActor(Actor);
        renWin.GetRenderer().SetBackground(0.0, 0.1, 0.1);
        renWin.resetCamera();

        //Add Java UI components
        exitButton = new JButton("Exit");
        exitButton.addActionListener(this);

        add(renWin, BorderLayout.CENTER);
        add(exitButton, BorderLayout.SOUTH);
      }

      /** An ActionListener that listens to the button. */
      public void actionPerformed(ActionEvent e)
      {
        if (e.getSource().equals(exitButton))
        {
          System.exit(0);
        }
      }

      public static void main(String s[])
      {
        SwingUtilities.invokeLater(new Runnable()
          {
            public void run()
            {
              JFrame frame = new JFrame("Line");
              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              frame.getContentPane().setLayout(new BorderLayout());
              frame.getContentPane().add(new Line(), BorderLayout.CENTER);
              frame.setSize(400, 400);
              frame.setLocationRelativeTo(null);
              frame.setVisible(true);
            }
          });
      }
    }