import java.awt.*;
import java.awt.image.*;

public class HFDemo extends java.applet.Applet {

    HFEngine theEngine;
    int[] destination, pattern;
    Image pat; int w; int h;
    Image result;

    public void init() {
	Image pat = getImage(getDocumentBase(), "image/pattern.jpg");
	MediaTracker mt = new MediaTracker(this);
        mt.addImage(pat,0);
	try { mt.waitForID(0); 
	} catch (Exception error) {
	    System.out.println("Error loading image!");
	    System.out.println(error);
	    System.exit(10);
	}
	w = pat.getWidth(this); h = pat.getHeight(this);
        System.out.println(w+"x"+h);
        pattern = new int[w*h];
	dump(pat, pattern, w, h);
	pat = null;
	destination = new int[h*(int)(w*(Math.ceil(h/(float)w)+1))];
    }

    public void start() {
	if (theEngine == null) {
	    theEngine = new HFEngine(destination, pattern,
                                     (int)(w*(Math.ceil(h/(float)w)+1)),w,h);
	    theEngine.start();
	}
    }

    public boolean mouseDown(Event evt, int x, int y) {
	repaint();
	return true;
    }

    public void update(Graphics g) {
        paint(g);
        try {
           Thread.sleep(100);
        } catch (Exception e) {}
    }

    private void dump (Image img, int[] array, int w, int h) {
        System.out.println("Grabbing pixels");
        PixelGrabber pg = new PixelGrabber(img.getSource(), 0, 0, w, h, array, 0, w);
        try { pg.grabPixels(0); }
	catch (Exception e) {
            System.out.println("Error retrieving image!");
	}
    }

    public void stop() {
	if (theEngine != null) {
	    theEngine.stop();
	    theEngine = null;
	}
    }

    public void paint(Graphics g) {
        System.out.println("Painting");
        if (result != null) g.drawImage(result, 0, 0, this);
        else if (theEngine.yar != null) {
             result = createImage(theEngine.yar);
             g.drawImage(result, 0, 0, this);
        }
    }

}