Sample12.java

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

/**
 *  Define our applet class.  It extends the Applet object
 */
public class Sample12 extends Applet implements ActionListener{


//
// define and create the objects that make up the interface
//
   Sketcher pad = new Sketcher();  // create a something to draw on.
   Label current = new Label("You are drawing this color",Label.CENTER);


 /**
  * Constructor the applet
  */
  public Sample12() {

  }

/**
 *  The following methods initialize the applet and are
 * invoked automatically.
 */
   public void init(){

//
// first set the applets layout manager
//
   BorderLayout layout = new BorderLayout(5,5);
   setLayout(layout);
   setBackground(Color.lightGray);
//
// add the sketcher to the center section and a color
//
   add("Center",pad);

//
// create a toolbar object for colors
//
   Panel tb = new Panel();
   tb.setLayout(new GridLayout(8,1,3,3));

   add("West",tb);  // add the toolbar to the west region

   Button red = new Button("");
   red.setBackground(Color.red);
   red.addActionListener(this);
   tb.add(red);

   Button green = new Button("");
   green.setBackground(Color.green);
   green.addActionListener(this);
   tb.add(green);

   Button blue = new Button("");
   blue.setBackground(Color.blue);
   blue.addActionListener(this);
   tb.add(blue);

   Button yellow = new Button("");
   yellow.setBackground(Color.yellow);
   yellow.addActionListener(this);
   tb.add(yellow);

   Button black = new Button("");
   black.setBackground(Color.black);
   black.addActionListener(this);
   tb.add(black);

   Button white = new Button("");
   white.setBackground(Color.white);
   white.addActionListener(this);
   tb.add(white);

   Button cyan = new Button("");
   cyan.setBackground(Color.cyan);
   cyan.addActionListener(this);
   tb.add(cyan);

   Button pink = new Button("");
   pink.setBackground(Color.pink);
   pink.addActionListener(this);
   tb.add(pink);

//
// Show the current color in the south
//
//

   current.setBackground(Color.lightGray);
   current.setForeground(pad.getColor());
   add("South",current);

  }

/**
  * this method is called whenever a button is
  * pressed. Figure out what was pressed then do it
  */
  public void actionPerformed(ActionEvent e){
  //
  // first make sure that it was a button that sent this
  // event
  //
  if(e.getSource() instanceof Button){
    Button b = (Button) e.getSource();

    pad.setColor(b.getBackground());
    current.setForeground(b.getBackground());

   } // end if

  } // end of actionPerformed
} // end of class

Sketcher.java

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


/**
 *  Sketcher class, handles mouse input to draw on a panel
 */

 class Sketcher extends Panel implements MouseListener, MouseMotionListener{

 boolean mouseDown = false;
 int downX, downY;
 Color currentColor = Color.black;

/**
 * Constructor
 */
 Sketcher() {

  addMouseListener(this);        // create and add the mouse listener
  addMouseMotionListener(this);  // create and add the mouse motion listener
  setBackground(Color.white);
 }
/**
 *  Set the color to use
 */
 public void setColor(Color theColor){
   currentColor = theColor;
 }

/**
 * return the current drawing color
 */
 public Color getColor(){
    return currentColor;
}

/**
 * Mouse Clicked Event
 */
 public void mouseClicked(MouseEvent e) {
 }
/**
 * Mouse Entered Event
 */
 public void mouseEntered(MouseEvent e) {
 }
/**
 * Mouse Exited Event
 */
 public void mouseExited(MouseEvent e){
 }
/**
 * Mouse Pressed Event
 */
 public void mousePressed(MouseEvent e) {

   mouseDown = true;  // remember this happened
   downX = e.getX();      // store the x location of the mouse
   downY = e.getY();      // store the y location
 }
/**
 * Mouse Released Event
 */
 public void mouseReleased(MouseEvent e) {

  if(mouseDown) {
    Graphics g = getGraphics();       // create a graphics object
    g.setColor(currentColor);             // set its color
    g.drawLine(downX,downY, e.getX(), e.getY()); // tell it to draw a line
    mouseDown = false;
   }

  }

/**
 * Mouse Moved Event
 */
 public void mouseMoved(MouseEvent e) {


  }

/**
 * Mouse Dragged Event
 */
 public void mouseDragged(MouseEvent e) {

  if(mouseDown) {
    Graphics g = getGraphics();       // create a graphics object
    g.setColor(currentColor);             // set its color
    g.drawLine(downX,downY, e.getX(), e.getY()); // tell it to draw a line
    downX = e.getX();
    downY = e.getY();
  }

  }


} //