Source of Scribble.java

Structures and functions

public class Scribble extends JFrame 

  1: 
  2: package scribble1; 
  3: 
  4: import java.awt.*;
  5: import java.awt.event.*;
  6: import javax.swing.*; 
  7: 
  8: public class Scribble extends JFrame {
  9: 
 10:   public Scribble() {
 11:     setTitle("Scribble Pad");
 12:     canvas = new ScribbleCanvas(); 
 13:     canvas.setBackground(Color.white); 
 14:     getContentPane().setLayout(new BorderLayout()); 
 15:     getContentPane().add(canvas, BorderLayout.CENTER);
 16:     addWindowListener(new WindowAdapter() {
 17:         public void windowClosing(WindowEvent e) {
 18:           System.exit(0);
 19:         }
 20:       }); 
 21:   }
 22: 
 23:   public static void main(String[] args) {
 24:     int width = 600; 
 25:     int height = 400; 
 26:     JFrame frame = new Scribble();
 27:     frame.setSize(width, height);
 28:     Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
 29:     frame.setLocation(screenSize.width/2 - width/2,
 30:                       screenSize.height/2 - height/2);
 31:     frame.show();
 32:   }
 33: 
 34:   protected ScribbleCanvas canvas; 
 35: 
 36: }