SWT之Canvas绘图

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1. import org.eclipse.swt.SWT;  
2. import org.eclipse.swt.events.PaintEvent;  
3. import org.eclipse.swt.events.PaintListener;  
4. import org.eclipse.swt.graphics.Image;  
5. import org.eclipse.swt.layout.FormLayout;  
6. import org.eclipse.swt.widgets.Canvas;  
7. import org.eclipse.swt.widgets.Display;  
8. import org.eclipse.swt.widgets.Shell;  
9. public class ddd {  
10.     protected Shell shell;  
11.     private Canvas can;  
12.     private final Image img = new Image(this.display, 'pic_1.png');  
13.     private Display display;  
14.     public static void main(String[] args) {  
15.         try {  
16.             ddd window = new ddd();  
17.             window.open();  
18.         } catch (Exception e) {  
19.             e.printStackTrace();  
20.         }  
21.     }  
22.     public void open() {  
23.         createContents();  
24.         this.can.addPaintListener(new PaintListener() {  
25.             public void paintControl(PaintEvent e) {  
26.                 can.setBounds(0,0,200,200);  
27.                 e.gc.drawImage(img, 0, 0);  
28.             }  
29.         });  
30.         shell.open();  
31.         while (!shell.isDisposed()) {  
32.             if (!display.readAndDispatch()) {  
33.                 display.sleep();  
34.             }  
35.         }  
36.         this.display.dispose();  
37.     }  
38.     /** 
39.      * Create contents of the window. 
40.      */  
41.     protected void createContents() {  
42.         this.display = Display.getDefault();  
43.         System.out.println(this.display.getBounds());  
44.         shell = new Shell();  
45.         shell.setLayout(new FormLayout());  
46.         shell.setText('SWT Application');  
47.         this.can = new Canvas(shell, SWT.BORDER);  
48.         can.setBackground(display.getSystemColor(SWT.COLOR_GREEN));  
49.     }  
50. }