// adapted from java in a nutshell

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class scribble extends Applet {
  private int x1, y1;

  public void init() {
    this.enableEvents(AWTEvent.MOUSE_EVENT_MASK |
                      AWTEvent.MOUSE_MOTION_EVENT_MASK |
                      AWTEvent.KEY_EVENT_MASK);
    this.requestFocus();  
  }

  public void processMouseEvent(MouseEvent e) {
    if (e.getID() == MouseEvent.MOUSE_PRESSED) {  
      x1 = e.getX(); y1 = e.getY();
    }
    else super.processMouseEvent(e); 
  }

  public void processMouseMotionEvent(MouseEvent e) {
    if (e.getID() == MouseEvent.MOUSE_DRAGGED) { 
      int x = e.getX(), y = e.getY();
      Graphics g = this.getGraphics();
      g.setColor(new Color(255,0,0));
      g.drawLine(x1, y1, x, y);
      x1 = x; y1 = y;
    }
    else super.processMouseMotionEvent(e);
  }

  public void processKeyEvent(KeyEvent e) {
    if ((e.getID() == KeyEvent.KEY_TYPED)) {
      Graphics g = this.getGraphics();

      if (e.getKeyChar() == 'b') { g.setColor(new Color(0,0,255)); }
      if (e.getKeyChar() == 'c') { g.setColor(new Color(255,255,255)); }
      if (e.getKeyChar() == 'g') { g.setColor(new Color(0,255,0)); }
      if (e.getKeyChar() == 'r') { g.setColor(new Color(255,0,0)); }

      g.fillRect(0, 0, this.getSize().width, this.getSize().height);
    }
    else super.processKeyEvent(e); 
  }

}