/**
 *
 * <p>Undo Redo for image manipulations</p>
 * <p>Copyright: Copyright (c) 2007 Raditha Dissanayake.</p>
 * 
 * @version 1.0 
 */
package com.raditha.articles;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.renderable.ParameterBlock;
import java.util.Vector;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;
import javax.swing.*;

/**
 *
 * @author raditha
 */
public class RenderedOpHistory
{
    JFrame jfr = new JFrame();
    JPanel panel = new JPanel()
    {
        public void paintComponent(Graphics g)
        {
            Graphics2D g2d = (Graphics2D) g;
            g2d.drawRenderedImage(image, new AffineTransform());
        }
    };
    
    RenderedOp image;
    JButton btn_undo = new JButton("Undo");
    JButton btn_redo = new JButton("Redo");
    
    Vector<RenderedOp> redoActions = new Vector();
    
    /** Creates a new instance of UndoRedo */
    public RenderedOpHistory()
    {
        btn_undo.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                Vector<RenderedOp> v = image.getSources();
                if(v != null && v.size() != 0)
                {
                    redoActions.add(image);
                    image = v.firstElement();
                    panel.repaint();
                    
                }
            }
        });
        
        btn_redo.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                if(redoActions != null && redoActions.size() != 0)
                {
                    image = redoActions.lastElement();
                    redoActions.remove(image);
                    
                    panel.repaint();
                    
                }
            }
        });
        
        image = JAI.create("fileload","/home/raditha/radinka.png");
        
        ParameterBlock pb = new ParameterBlock();
        pb.addSource(image);
        double consts[] = {100,20,30};
        pb.add(consts);
        image = JAI.create("addconst", pb, null);
        
        pb = new ParameterBlock();
        pb.addSource(image);
        consts[1]=200;
        pb.add(consts);
        image = JAI.create("addconst", pb, null);
        
        pb = new ParameterBlock();
        pb.addSource(image);
        pb.add(0.5f);
        pb.add(0.5f);
        pb.add(0.0F);
        pb.add(0.0F);
        
        image = JAI.create("scale",pb,null);
        
        jfr.getContentPane().setLayout(new BorderLayout());
        
        JPanel jp_sub = new JPanel();
        jp_sub.setLayout(new FlowLayout());
        
        jfr.getContentPane().add(panel, BorderLayout.CENTER);
        jfr.getContentPane().add(jp_sub,BorderLayout.SOUTH);
        
        jp_sub.add(btn_undo);
        jp_sub.add(btn_redo);
        
        
        Dimension dim = new Dimension(image.getWidth(), image.getHeight());
        System.out.println(dim);
                
        panel.setSize(dim);
        
        jfr.setSize(400,400);
        jfr.setVisible(true);
        jfr.setDefaultCloseOperation(jfr.EXIT_ON_CLOSE);

        
        panel.repaint();
    }
    
    public static void main(String[] args)
    {
        System.setProperty("com.sun.media.jai.disableMediaLib","true");
        RenderedOpHistory undoRedo = new RenderedOpHistory();
        
    }
    
}