// copied liberally with few changes from Lewis and Loftus p. 598
// demonstrates use of recursion graphically

import java.awt.*;
import javax.swing.JApplet;

public class TiledPictures extends JApplet {
	
	private static final long serialVersionUID = 1L;
	private final int APPLET_WIDTH = 320;
	private final int APPLET_HEIGHT = 320;
	private final int MIN = 20;  // smallest picture size
	
	private Image vangogh, sunflower, daffodil;
	
	/*
	 * loads the images
	 */
	public void init( ) {
		vangogh =  getImage(getDocumentBase( ), "vangogh.jpg");
		sunflower = getImage(getDocumentBase( ), "sunflower.jpg");
		daffodil = getImage(getDocumentBase( ), "daffodil.jpg");
		
		setSize(APPLET_WIDTH, APPLET_HEIGHT);
	}
	
	/*
	 * draws the three images, then calls itself recursively
	 */
	public void drawPictures(int size, Graphics page) {
		page.drawImage(sunflower, 0, size/2, size/2, size/2, this);
		page.drawImage(daffodil, size/2, 0, size/2, size/2, this);
		page.drawImage(vangogh, size/2, size/2, size/2, size/2, this);
		
		if (size > MIN) {
			drawPictures(size/2, page);
		}
	}
	
	/*
	 * perform the initial call to the drawPictures method
	 */
	public void paint (Graphics page) {
		drawPictures(APPLET_WIDTH, page);
	}

}