Animating a line

Question

I was wondering does anyone know the code to animate a line being drawing between 2 Points. Thats about it

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.Timer;
public class AnimatedLine extends JPanel implements ActionListener
    Line2D.Double line;
    Timer timer;
    double xInc;
    public AnimatedLine()
        line = new Line2D.Double(10, 200, 50, 200);
        timer = new Timer(40, this);
        xInc = 3;
    public void actionPerformed(ActionEvent e)
        Point2D p1 = line.getP1();
        Point2D p2 = line.getP2();
        checkBoundries();
        line.setLine(p1.getX()+xInc, p1.getY(), p2.getX()+xInc, p2.getY());
        repaint();
    private void checkBoundries()
        double x1 = line.getX1();
        double x2 = line.getX2();
        int w = getWidth();
        if(x1 + xInc < 0 || x1 + xInc > w ||
           x2 + xInc < 0 || x2 + xInc > w)
            xInc *= -1;
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.draw(line);
    public void start()
        if(!timer.isRunning())
            timer.start();
    public void stop()
        timer.stop();
    public static void main(String[] args)
        AnimatedLine al = new AnimatedLine();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(al);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        al.start();
}