draw line,oval,circle and arrow on the image dynamically

import java.awt.*;

import java.awt.event.*;

import java.awt.image.BufferedImage;

import java.io.*;

import javax.imageio.ImageIO;

import javax.swing.*;

import javax.swing.event.MouseInputAdapter;

public class DrawOverImage extends JPanel {

BufferedImage image;

Rectangle rect = new Rectangle();

public DrawOverImage(BufferedImage image) {

this.image = image;

}

protected void setRect(Point p1, Point p2) {

rect.setFrameFromDiagonal(p1, p2);

repaint();

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

int x = (getWidth() - image.getWidth())/2;

int y = (getHeight() - image.getHeight())/2;

g2.drawImage(image, x, y, this);

g2.setPaint(Color.red);

g2.draw(rect);

}

public static void main(String[] args) throws IOException {

String path = "images/cougar.jpg";

BufferedImage image = ImageIO.read(new File(path));

DrawOverImage test = new DrawOverImage(image);

DrawCoordinator coordinator = new DrawCoordinator(test);

test.addMouseListener(coordinator);

test.addMouseMotionListener(coordinator);

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(test);

f.setSize(400,400);

f.setLocation(200,200);

f.setVisible(true);

}

}

class DrawCoordinator extends MouseInputAdapter {

DrawOverImage component;

Point start;

boolean dragging = false;

public DrawCoordinator(DrawOverImage dow) {

component = dow;

}

public void mousePressed(MouseEvent e) {

start = e.getPoint();

dragging = true;

}

public void mouseReleased(MouseEvent e) {

dragging = false;

}

public void mouseDragged(MouseEvent e) {

if(dragging) {

component.setRect(start, e.getPoint());

}

}

}

crwooda at 2007-7-28 17:53:12 >