Download import java.awt.Container

import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RectangularShape;
import javax.swing.JFrame;
import javax.swing.JPanel;
class Targets{
int x;
int y;
RectangularShape shape;
Targets next;
Targets(){
next = null;
}
Targets(int x, int y){
next = null;
shape = new Rectangle2D.Double(x, y, 30.0,30.0);
}
}
public class step09Sample {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame = new MyDrawFrame();
frame.setVisible(true);
}
}
class MyDrawFrame extends JFrame{
//
private static final long serialVersionUID = 1L;
private DrawPanel panel;
MyDrawFrame(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("test");
setSize(300, 300);
Container contentPane = getContentPane();
panel = new DrawPanel();
contentPane.add(panel,"Center");
}
}
class DrawPanel extends JPanel implements MouseListener{
private Rectangle2D box;
Targets first,current,last;
DrawPanel(){
addMouseListener(this);
first = null;
current = last = null;
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
Targets cur;
cur = first;
while(cur != null){
g2.draw(cur.shape);
cur = cur.next;
}
}
public void mouseClicked(MouseEvent e){
Point p = e.getPoint();
boolean isHit = false;
if(first == null){
first = new Targets(p.x,p.y);
last = first;
} else {
current = new Targets(p.x, p.y);
last.next = current;
last = current;
}
repaint();
return;
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}
}