Java How to Program, Early Objects, 11th Edition

... paintComponent(Graphics g) 36      {
37         super.paintComponent(g); // clears drawing area
38
39          // draw all points
40          for (Point point : points)
41             g.fillOval(point.x, point.y, 4, 4);
42      }
43   }

Fig. 26.35 Testing PaintPanel.

 1   // Fig. 26.35: Painter.java
 2   // Testing PaintPanel.
 3   import java.awt.BorderLayout;
 4   import javax.swing.JFrame;
 5   import javax.swing.JLabel;
 6
 7   public class Painter
 8   {
 9      public static void main(String[] args)
10      {
11         // create JFrame
12         JFrame application = new JFrame("A simple paint program");
13
14         PaintPanel paintPanel = new PaintPanel();
15         application.add(paintPanel, BorderLayout.CENTER);
16
17         // create a label and place it in SOUTH of BorderLayout
18         application.add(new JLabel("Drag the mouse to draw"),
19            BorderLayout.SOUTH ...