01.import java.awt.event.*;
02.import java.awt.*;
03.import javax.swing.*;
04.
05.public class Zoom extends JFrame {
06. mapPanel map = new mapPanel("usa.gif");
07.
08.public Zoom()
09.{
10.
11. addWindowListener(new WindowAdapter()
12. { public void windowClosing(WindowEvent ev)
13. {dispose();
14. System.exit(0);}});
15. setBounds(10,10,700,400);
16. getContentPane().setLayout(null);
17. getContentPane().add(map);
18. setVisible(true);
19.
20.}
21.public class mapPanel extends JPanel
22.{
23. Image map;
24. double mw,mh;
25. double zw,zh;
26. double mx,my;
27. double zf=1,tx=0,ty=0;
28.
29.public mapPanel(String name)
30.{
31. setBounds(50,50,200,150);
32. setBackground(Color.white);
33. map = getToolkit().createImage(name);
34. MediaTracker tracker = new MediaTracker(this);
35. tracker.addImage(map,0);
36. try {tracker.waitForID(0);}
37. catch (InterruptedException e){}
38. mw = map.getWidth(null);
39. mh = map.getHeight(null);
40. zw = 200;
41. zh = 150;
42. mx = mw/2;
43. my = mh/2;
44.
45. addMouseListener(new MouseAdapter()
46. {
47. public void mousePressed(MouseEvent m)
48. {
49. zf = zf + 0.025;
50. double sw = zw / mw;
51. double sh = zh / mh;
52. double sx = m.getX() / sw;
53. double sy = m.getY() / sh;
54. tx = mw/2 - (sx-tx);
55. ty = mh/2 - (sy-ty);
56. repaint();
57. }
58. });
59.}
60.public void paintComponent(Graphics g)
61.{
62. super.paintComponent(g);
63. Graphics2D g2 = (Graphics2D)g;
64. g2.scale(zf*zw/mw,zf*zh/mh);
65. g2.translate(tx/zf,ty/zf);
66. g2.drawImage(map,0,0,null);
67. g2.dispose();
68.}
69.}
70.public static void main(String[]args)
71.{
72. new Zoom ();
73.}
