Recursion - Java Software Solutions: Foundations of Program Design - page 602

LISTING 12.5
//********************************************************************
// TiledPictures.java Author: Lewis/Loftus
//
// Demonstrates the use of recursion.
//********************************************************************
import java.awt.*;
import javax.swing.JApplet;
public class TiledPictures extends JApplet
{
private final int APPLET_WIDTH = 320;
private final int APPLET_HEIGHT = 320;
private final int MIN = 20; // smallest picture size
private Image world, everest, goat;
//-----------------------------------------------------------------
// Loads the images.
//-----------------------------------------------------------------
public void init()
{
world = getImage (getDocumentBase(), "world.gif");
everest = getImage (getDocumentBase(), "everest.gif");
goat = getImage (getDocumentBase(), "goat.gif");
setSize (APPLET_WIDTH, APPLET_HEIGHT);
}
//-----------------------------------------------------------------
// Draws the three images, then calls itself recursively.
//-----------------------------------------------------------------
public void drawPictures ( int size, Graphics page)
{
page.drawImage (everest, 0, size/2, size/2, size/2, this);
page.drawImage (goat, size/2, 0, size/2, size/2, this);
page.drawImage (world, size/2, size/2, size/2, size/2, this);
if (size > MIN)
drawPictures (size/2, page);
}
//-----------------------------------------------------------------
// Performs the initial call to the drawPictures method.
//-----------------------------------------------------------------