package elte.java2_utikalauz5.java2d;

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

/**
peldaprogram a konvolucios muveletek megvalositasara.

@link.forrásfájl {@docRoot}/../data/java2d/src Elesites.java
@link.letöltés {@docRoot}/../data/java2d Elesites.jar
@since Java 2 Útikalauz programozóknak
*/
class Elesites extends Canvas {
    /** Verziószám */
    private final static long serialVersionUID = 15L;

	Image kep;
	BufferedImage eredetiKep, ujKep;

	public void kepBetoltes () {
		setBackground (Color.white);
		kep = getToolkit ().getImage (getClass().getClassLoader().getResource("kep.jpg"));
	        try {
        	    MediaTracker tracker = new MediaTracker (this);
	            tracker.addImage (kep, 0);
        	    tracker.waitForID (0);
	        }

		catch (Exception e) {
		}
	}

	public void paint (Graphics g) {
		Graphics2D g2 = (Graphics2D) g;

		// a betoltott kepbol egy BufferedImage kepet keszitunk
		eredetiKep = new BufferedImage (kep.getWidth (this), kep.getHeight (this),
				BufferedImage.TYPE_INT_RGB);
                eredetiKep.createGraphics ().drawImage (kep, 0, 0, null);

		ujKep = new BufferedImage (kep.getWidth (this), kep.getHeight (this),
				BufferedImage.TYPE_INT_RGB);

		float[] sulyok = {-1.0f, -1.0f, -1.0f,
				  -1.0f,  9.0f, -1.0f,
				  -1.0f, -1.0f, -1.0f };
		ConvolveOp elesites = new ConvolveOp (new Kernel (3, 3, sulyok));
		elesites.filter (eredetiKep, ujKep);

		// kirajzoljuk az eredeti es az uj kepet
		g2.drawImage (eredetiKep, 20, 20, this);
		g2.drawImage (ujKep, 20, 220, null);
	}

	public static void main (String[] args) {
		Frame f = new Frame ();
		Elesites e = new Elesites ();
		e.kepBetoltes ();

		f.add (e);

		f.addWindowListener (
			new WindowAdapter () {
				public void windowClosing (WindowEvent e) {
					System.exit (0);
				}
			}
		);

		f.setSize (300, 450);
		f.setVisible (true);
	}
}