1    // ImagePanel.java 
2    // ImagePanel contains an image for display.  The image is 
3    // converted to a BufferedImage for filtering purposes. 
4    package j2d; 
5     
6    // Java core packages 
7     
8    import javax.swing.*; 
9    import java.awt.*; 
10   import java.awt.image.ImageObserver; 
11    
12   public class ImagePanel 
13           extends JPanel 
14           implements ImageProcessListener, 
15           ImageBeanInterface { 
16    
17       private Image originalImage; 
18       private Image processedImage; 
19    
20       public Image getProcessedImage() { 
21           return processedImage; 
22       } 
23    
24    
25       // ImagePanel constructor 
26       public ImagePanel(Image _img) { 
27           originalImage = _img; 
28           processedImage = _img; 
29    
30           ImageUtils.waitForImage(this, getImage()); 
31    
32       } // end ImagePanel constructor 
33    
34    
35       public void update(ImageProcessorInterface ip) { 
36           if (ip == null) { 
37               setImage(originalImage); 
38               return; 
39           } 
40           processedImage = ip.process(originalImage); 
41           repaint(); 
42       } 
43    
44       public void revert() { 
45           processedImage = originalImage; 
46       } 
47    
48    
49       // draw ImagePanel 
50       public void paintComponent(Graphics g) { 
51           super.paintComponent(g); 
52           Dimension d = getSize(); 
53           ImageObserver io = this; 
54           Image img = processedImage; 
55           int w = d.width; 
56           int h = d.height; 
57           g.drawImage(img, 0, 0, w, h, io); 
58       } 
59    
60       // get preferred ImagePanel size 
61       public Dimension getPreferredSize() { 
62           return new Dimension(originalImage.getWidth(this), 
63                   originalImage.getHeight(this)); 
64       } 
65    
66    
67       public Image getImage() { 
68           return originalImage; 
69       } 
70    
71       public void setImage(Image image) { 
72           originalImage = image; 
73           processedImage = image; 
74           repaint(); 
75       } 
76   } 
77    
78    
79