/**
  * Copyright (c): Uwe Schmidt, FH Wedel
  *
  * You may study, modify and distribute this source code
  * FOR NON-COMMERCIAL PURPOSES ONLY.
  * This copyright message has to remain unchanged.
  *
  * Note that this document is provided 'as is',
  * WITHOUT WARRANTY of any kind either expressed or implied.
  */

// ein scribble Beispiel
// angelehnt an das Beispiel aus dem Nutshell Buch
// dieses applet kann die gezeichnete Information nicht
// wiederherstellen, wenn das Fenster wiederholt gezeichnet
// werden muss

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

public
class Scribble
  extends Applet
{
  int lastX;
  int lastY;

  //--------------------
  // die init routine

  public void init() {

    // grafische Objekte erzeugen
    // und konfigurieren

    Button b = new Button("Clear");

    setBackground(Color.yellow);

    //--------------------
    // event handler installieren
    // fuer das applet selbst

    addMouseListener
      (new MouseAdapter() {
	public
	void mousePressed(MouseEvent e) {
	  lastX = e.getX();
	  lastY = e.getY();
	}
      });

    //--------------------

    addMouseMotionListener
      (new MouseMotionAdapter() {
	public
	void mouseDragged(MouseEvent e) {
	  Graphics g = getGraphics();
	  int x = e.getX();
	  int y = e.getY();

	  g.setColor(Color.black);
	  g.drawLine(lastX, lastY, x, y);

	  lastX = x; lastY = y;
	}
      });

    //--------------------
    // event handler fuer den Knopf

    b.addActionListener
      (new ActionListener() {
	public
	void actionPerformed(ActionEvent e) {
	  Graphics g = getGraphics();
	  g.setColor(getBackground());
	  g.fillRect(0, 0, getSize().width, getSize().height);
	}
      });

    //--------------------
    // Komponenten anordnen
    add(b);
  }
}

//--------------------