# Line

VTKExamples/Java/GeometricObjects/Line

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.

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

### 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);
              }
            });
          }
    }