1 import javax.swing.JComponent;
 2 import java.util.*;
 3 import java.awt.*;
 4 import java.awt.geom.*;
 5
 6 @SuppressWarnings("serial")
 7 public class SketcherView extends JComponent implements Observer {
 8   public SketcherView(Sketcher theApp) {
 9     this.theApp = theApp;
10   }
11
12   // Method called by Observable object when it changes
13   public void update(Observable o, Object rectangle) {
14     // Code to respond to changes in the model...
15   }
16
17   // Method to draw on the view
18   @Override
19   public void paint(Graphics g) {
20     // Temporary code...
21     Graphics2D g2D = (Graphics2D)g;                                    // Get a Java 2D device context
22
23     g2D.setPaint(Color.RED);                                           // Draw in red
24
25     // Position width and height of first rectangle
26     Point2D.Float p1 = new Point2D.Float(50.0f, 10.0f);
27     float width1 = 60;
28     float height1 = 80;
29
30     // Create and draw the first rectangle
31     Rectangle2D.Float rect = new Rectangle2D.Float(p1.x, p1.y, width1, height1);
32     g2D.draw(rect);
33
34     // Position width and height of second rectangle
35     Point2D.Float p2 = new Point2D.Float(150.0f, 100.0f);
36     float width2 = width1 + 30;
37     float height2 = height1 + 40;
38
39     // Create and draw the second rectangle
40     g2D.draw(new Rectangle2D.Float(
41                        (float)(p2.getX()), (float)(p2.getY()), width2, height2));
42     g2D.setPaint(Color.BLUE);                                          // Draw in blue
43
44     // Draw lines to join corresponding corners of the rectangles
45     Line2D.Float line = new Line2D.Float(p1,p2);
46     g2D.draw(line);
47
48     p1.setLocation(p1.x + width1, p1.y);
49     p2.setLocation(p2.x + width2, p2.y);
50     g2D.draw(new Line2D.Float(p1,p2));
51
52     p1.setLocation(p1.x, p1.y + height1);
53     p2.setLocation(p2.x, p2.y + height2);
54     g2D.draw(new Line2D.Float(p1,p2));
55
56     p1.setLocation(p1.x - width1, p1.y);
57     p2.setLocation(p2.x - width2, p2.y);
58     g2D.draw(new Line2D.Float(p1, p2));
59
60     g2D.drawString("Lines and rectangles", 60, 250);                   // Draw some text
61
62   }
63
64   private Sketcher theApp;                                             // The application object
65 }