/*
 * @(#)Flip.java
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.*;
import java.net.URL;

public class Flip extends JApplet implements ItemListener {
    JCheckBox flipXBox;
    JCheckBox flipYBox;
    FlipPanel flipPanel;

    public void init() { 

	// Load the face image
	Image img = getImage(getURL("monalisa.jpg")); 
	try { 
	    MediaTracker tracker = new MediaTracker(this); 
	    tracker.addImage(img, 0); 
	    tracker.waitForID(0); 
	}
	catch ( Exception e ) {
	    e.printStackTrace();
	} 
	
	//
	// Build a user interface
	//

	Container mainPane = getContentPane();

	// The drawing panel

	flipPanel = new FlipPanel(img);

	// Button1
	flipXBox = new JCheckBox("Flip X");
        flipXBox.setSelected(flipPanel.getFlipX());
        flipXBox.addItemListener(this);

	// Button2
	flipYBox = new JCheckBox("Flip Y");
        flipYBox.setSelected(flipPanel.getFlipY());
        flipYBox.addItemListener(this);

	// Button array
        JPanel checkPanel = new JPanel();
	checkPanel.setLayout(new GridLayout(1, 2));
	checkPanel.add(flipXBox);
	checkPanel.add(flipYBox);

        mainPane.setLayout(new BorderLayout());
        mainPane.add(checkPanel, BorderLayout.NORTH);
        mainPane.add(flipPanel, BorderLayout.CENTER);
    }
    
    // This handles the check boxes
    public void itemStateChanged(ItemEvent e) {
	Object source = e.getItemSelectable();
	
	if (source == flipXBox) {
	    if (e.getStateChange() == ItemEvent.SELECTED) {
		flipPanel.setFlipX(true);
	    }
	    else if (e.getStateChange() == ItemEvent.DESELECTED) {
		flipPanel.setFlipX(false);
	    }
	} else if (source == flipYBox) {
	    if (e.getStateChange() == ItemEvent.SELECTED) {
		flipPanel.setFlipY(true);
	    }
	    else if (e.getStateChange() == ItemEvent.DESELECTED) {
		flipPanel.setFlipY(false);
	    }
	}
    }

    private URL getURL(String filename) {
        URL codeBase = this.getCodeBase();
        URL url = null;

        try {
            url = new URL(codeBase, filename);
        } catch (java.net.MalformedURLException e) {
            System.out.println("Couldn't create image, badly specified URL: " 
			       + url);
            return null;
        }

        return url;
    }

    // FlipPanel implements the drawing Panel
    private class FlipPanel extends JPanel {
	private BufferedImage face;
	private boolean flipX=false;
	private boolean flipY=false;
	
	public FlipPanel(Image img) {
	    setBackground(Color.white); 
	    int iw = img.getWidth(this); 
	    int ih = img.getHeight(this); 
	    face = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB); 
	    Graphics2D faceg = face.createGraphics(); 
	    faceg.drawImage(img,0,0,this);
	}
	
	public void paintComponent(Graphics g) {
	    Graphics2D g2 = (Graphics2D) g;
	    
	    Dimension d = getSize();
	    int w = d.width;
	    int h = d.height; 
	    
	    // Creates the buffered image.
	    BufferedImage buffImg = 
		new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
	    
	    Graphics2D gbi = buffImg.createGraphics();
	    
	    // Clears the previously drawn image.
	    g2.setColor(Color.white);
	    g2.fillRect(0, 0, w, h);
	    
	    int k, l;
	    int faceWidth = face.getWidth();
	    int faceHeight = face.getHeight();

	    // Loop over the colours in the original face
	    for (int i=0;i<faceWidth;i++) {
		for (int j=0;j<faceHeight;j++) {
		    k = (flipX ? (faceWidth  - i -1) : i );
		    l = (flipY ? (faceHeight - j -1) : j );
		    gbi.setColor(new Color(face.getRGB(k,l)));
		    gbi.drawLine(i,j,i,j);
		}
	    }
	    // Draws the buffered image.
	    g2.drawImage(buffImg, null, 4, 4);
	    System.out.println("Done flip");
	}

	public void setFlipX(boolean value) {
	    flipX = value;
	    repaint();
	}

	public void setFlipY(boolean value) {
	    flipY = value;
	    repaint();
	}

	public boolean getFlipX() {
	    return flipX;
	}

	public boolean getFlipY() {
	    return flipY;
	}
    }
}