Hi friend,

i am sending code of draw line using java Swing

import javax.swing.*;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;


public class DrowLine {
public static void main(String[] args) {
System.out.println("Line draw example using java Swing");
JFrame frame = new JFrame("Draw line example");
BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_BGR);
Graphics2D g = image.createGraphics();
g.setColor(Color.pink);
g.fillRect(0, 0, image.getWidth(), image.getHeight());
g.setColor(Color.BLACK);
RoundRectangle2D round = new RoundRectangle2D.Double(50, 50, 100, 100, 50, 50);
g.draw(round);
Point2D mousePoint = new Point2D.Double(101, 101);
Point2D center = new Point2D.Double(round.getCenterX(), round.getCenterY());
Point2D point2 = new Point2D.Double();
if (center.getX() == mousePoint.getX())
point2.setLocation(mousePoint.getX(), (mousePoint.getY() < center.getY()) ? round.getMinY() : round.getMaxY());
else {
double a = (center.getY() - mousePoint.getY()) / (center.getX() - mousePoint.getX());
double b = mousePoint.getY() - a * mousePoint.getX();
double x = (mousePoint.getX() < center.getX()) ? round.getMinX() : round.getMaxX();
point2.setLocation(x, a * x + b);
}
Line2D line = new Line2D.Double(mousePoint, point2);
g.setClip(round);
g.draw(line);
frame.getContentPane().add(new JLabel(new ImageIcon(image)));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,300);
frame.setVisible(true);
}
}

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Read for more information.

http://www.roseindia.net/java/

Thanks