1
2 import java.awt.*;
3 import javax.swing.*;
4 import java.awt.event.*;
5 import javax.swing.event.*;
6
7 public class Main
8 {
9 public static void main (String args[])
10 {
11 JFrame f = new JFrame ();
12 f.setLayout (null);
13 NEWImagepanel pan = new NEWImagepanel ("/1.jpg");
14 pan.setPreferredSize (new Dimension (800,800));
15 JScrollPane jspan = new JScrollPane (pan);
16 jspan.setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
17 jspan.setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_NEVER);
18 jspan.setBounds (0,0,400,400);
19 f.setSize (400,500);
20 f.add ("Center",jspan);
21 f.setVisible (true);
22 f.setDefaultCloseOperation (f.EXIT_ON_CLOSE);
23 }
24 }
25 class NEWImagepanel extends JPanel implements MouseListener ,MouseInputListener
26 {
27 private Image bgimg;
28 int anchorX = 0;
29 int anchorY = 0;
30
31 public NEWImagepanel ()
32 {
33 super ();
34 }
35 //參數(shù)所指圖片文件的路徑
36 public NEWImagepanel (String path)
37 {
38
39 super ();
40
41 MediaTracker tracker = new MediaTracker (this);
42 bgimg = new ImageIcon (getClass ().getResource (path)).getImage ();
43 tracker.addImage (bgimg,0);
44 try
45 {
46 tracker.waitForAll ();
47 }
48 catch(Exception e)
49 {
50 e.printStackTrace ();
51 }
52 addMouseMotionListener (this);
53 addMouseListener (this);
54
55 }
56 public void paintComponent (Graphics g)
57 {
58 if(bgimg == null)
59 {
60 super.paintComponent (g);
61 }
62 g.drawImage (bgimg,0,0,this.getWidth (),this.getHeight (),this);
63 //g.drawImage (bgimg ,0,0,null);
64 }
65
66 public void mouseClicked (MouseEvent e)
67 {
68 }
69
70 public void mousePressed (MouseEvent e)
71 {
72 anchorX = e.getX ();
73 anchorY = e.getY ();
74 try
75 {
76 setCursor (Cursor.getPredefinedCursor (Cursor.MOVE_CURSOR));
77 }
78 catch(Exception ex)
79 {
80 System.out.println (ex.toString ());
81 }
82 }
83
84 public void mouseReleased (MouseEvent e)
85 {
86 setCursor (Cursor.getDefaultCursor ());
87 }
88
89 public void mouseEntered (MouseEvent e)
90 {
91 }
92
93 public void mouseExited (MouseEvent e)
94 {
95 }
96
97 public void mouseDragged (MouseEvent e)
98 {
99 int x = e.getX ();
100 int y = e.getY ();
101 Container parent = getParent ();
102 if(parent instanceof JViewport)
103 {
104 JViewport viewport = (JViewport)parent;
105 Point p = viewport.getViewPosition ();
106 p.translate (anchorX - x ,anchorY - y);
107 p.x = Math.max (p.x, 0);
108 p.y = Math.max (p.y, 0);
109 p.x = Math.min (p.x,getWidth ()-viewport.getWidth ());
110 p.y = Math.min (p.y , getHeight ()-viewport.getHeight ());
111 viewport.setViewPosition (p);
112 }
113 }
114
115 public void mouseMoved (MouseEvent e)
116 {
117 }
118
119 }
120
posted on 2007-02-08 13:09
-274°C 閱讀(612)
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