/**************************************************************************
/* This class implements an image-viewer using buffered-images.
/*
/* Copyright (c) 2006 by Bernhard Bablok (mail@bablokb.de)
/*
/* This program is free software; you can redistribute it and/or modify
/* it under the terms of the GNU General Public License as published
/* by  the Free Software Foundation; either version 2 of the License or
/* (at your option) any later version.
/*
/* This program is distributed in the hope that it will be useful, but
/* WITHOUT ANY WARRANTY; without even the implied warranty of
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
/* GNU General Public License for more details.
/*
/* You should have received a copy of the GNU General Public License
/* along with this program; see the file COPYING.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.imageio.*;
import javax.imageio.stream.*;
import javax.swing.*;

/**
   This class implements an image-viewer using buffered-images.

   @version $Revision: 1.7 $
   @author  $Author: bablokb $
*/

public class ImageViewer2 extends ImageViewer {

  //////////////////////////////////////////////////////////////////////////////

  /**
     Constructor.
  */

  public ImageViewer2(String title, ImagePanel2 panel) {
    super(title,panel);
    JMenuBar menuBar = getJMenuBar();
    addMenu(menuBar);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Add menu for image-manipulation.
  */

  private void addMenu(JMenuBar menuBar) {
    JMenu menu = new JMenu("Transformation");
    menu.add(new JMenuItem(new AbstractAction("Scale") {
	public void actionPerformed(ActionEvent e) {
	  BufferedImage srcImg = (BufferedImage) getImage();
	  setImage(scaleImage(srcImg,0.75));
	};
      }));
    menu.add(new JMenuItem(new AbstractAction("Sharpen") {
	public void actionPerformed(ActionEvent e) {
	  BufferedImage srcImg = (BufferedImage) getImage();
	  setImage(sharpenImage(srcImg));
	};
      }));
    menuBar.add(menu);
    setJMenuBar(menuBar);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Scale image.
  */

  private BufferedImage scaleImage(BufferedImage srcImg,double scale) {
    AffineTransform atf = AffineTransform.getScaleInstance(scale,scale);
    AffineTransformOp ato = 
      new AffineTransformOp(atf,AffineTransformOp.TYPE_BILINEAR);
    // BufferedImage destImg = ato.createCompatibleDestImage(srcImg,null);
    return ato.filter(srcImg,null);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Sharpen current image.
  */

  public BufferedImage sharpenImage(BufferedImage srcImg) {
    srcImg = scaleImage(srcImg,1.0);
    final float[] kernelMatrix = {
      0.f, -1.f, 0.f,
      -1.f, 5.0f, -1.f,
      0.f, -1.f, 0.f};
    Kernel kernel = new Kernel(3,3,kernelMatrix);
    ConvolveOp co =
      new ConvolveOp(kernel,ConvolveOp.EDGE_NO_OP,null);
    return co.filter(srcImg,null);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Set image-files.
  */

  protected void setImages(String[] filenames) throws IOException {
    BufferedImage[] imgArray = new BufferedImage[filenames.length];
    for (int i=0;i<filenames.length;++i) {
      ImageReader reader = getReader(filenames[i]);
      ImageReadParam params = reader.getDefaultReadParam();
      imgArray[i] = reader.read(0,params);
    }
    setFiles(imgArray);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Get a configured reader for the image.
  */

  protected ImageReader getReader(String filename) throws IOException {
    File f = new File(filename);
    ImageInputStream iis = ImageIO.createImageInputStream(f);
    Iterator readers = ImageIO.getImageReaders(iis);
    ImageReader reader = (ImageReader) readers.next();
    reader.setInput(iis,true);
    return reader;
  }

  //////////////////////////////////////////////////////////////////////////////

  public static void main(String[] args) {
    if (args.length < 1) {
      System.out.println("usage: java " +
                                   ImageViewer2.class.getName() + " file [...]");
      System.exit(3);
    }

    try {
      ImageViewer2 viewer =
        new ImageViewer2("Buffered ImageViewer",new ImagePanel2());
      viewer.setImages(args);
      viewer.setCurrentImage();
      viewer.pack();
      viewer.setSize(WIDTH,HEIGHT);
      viewer.show();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}