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

/**
 * Program demonstrujący różne operacje na obrazach.
 * @version 1.03 2007-08-16
 * @author Cay Horstmann
 */
public class ImageProcessingTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(new Runnable()
         {
            public void run()
            {
               JFrame frame = new ImageProcessingFrame();
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setVisible(true);
            }
         });
   }
}

/**
 * Ramka posiadająca menu umożliwiające załadowanie obrazu z pliku
 * i wybór operacji oraz komponent przedstawiający wynik operacji.
 */
class ImageProcessingFrame extends JFrame
{
   public ImageProcessingFrame()
   {
      setTitle("ImageProcessingTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      add(new JComponent()
         {
            public void paintComponent(Graphics g)
            {
               if (image != null) g.drawImage(image, 0, 0, null);
            }
         });

      JMenu fileMenu = new JMenu("File");
      JMenuItem openItem = new JMenuItem("Open");
      openItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               openFile();
            }
         });
      fileMenu.add(openItem);

      JMenuItem exitItem = new JMenuItem("Exit");
      exitItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               System.exit(0);
            }
         });
      fileMenu.add(exitItem);

      JMenu editMenu = new JMenu("Edit");
      JMenuItem blurItem = new JMenuItem("Blur");
      blurItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               float weight = 1.0f / 9.0f;
               float[] elements = new float[9];
               for (int i = 0; i < 9; i++)
                  elements[i] = weight;
               convolve(elements);
            }
         });
      editMenu.add(blurItem);

      JMenuItem sharpenItem = new JMenuItem("Sharpen");
      sharpenItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               float[] elements = { 0.0f, -1.0f, 0.0f, -1.0f, 5.f, -1.0f, 0.0f, -1.0f, 0.0f };
               convolve(elements);
            }
         });
      editMenu.add(sharpenItem);

      JMenuItem brightenItem = new JMenuItem("Brighten");
      brightenItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               float a = 1.1f;
               // float b = 20.0f;
               float b = 0;
               RescaleOp op = new RescaleOp(a, b, null);
               filter(op);
            }
         });
      editMenu.add(brightenItem);

      JMenuItem edgeDetectItem = new JMenuItem("Edge detect");
      edgeDetectItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               float[] elements = { 0.0f, -1.0f, 0.0f, -1.0f, 4.f, -1.0f, 0.0f, -1.0f, 0.0f };
               convolve(elements);
            }
         });
      editMenu.add(edgeDetectItem);

      JMenuItem negativeItem = new JMenuItem("Negative");
      negativeItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               short[] negative = new short[256 * 1];
               for (int i = 0; i < 256; i++)
                  negative[i] = (short) (255 - i);
               ShortLookupTable table = new ShortLookupTable(0, negative);
               LookupOp op = new LookupOp(table, null);
               filter(op);
            }
         });
      editMenu.add(negativeItem);

      JMenuItem rotateItem = new JMenuItem("Rotate");
      rotateItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               if (image == null) return;
               AffineTransform transform = AffineTransform.getRotateInstance(Math.toRadians(5),
                     image.getWidth() / 2, image.getHeight() / 2);
               AffineTransformOp op = new AffineTransformOp(transform,
                     AffineTransformOp.TYPE_BICUBIC);
               filter(op);
            }
         });
      editMenu.add(rotateItem);

      JMenuBar menuBar = new JMenuBar();
      menuBar.add(fileMenu);
      menuBar.add(editMenu);
      setJMenuBar(menuBar);
   }

   /**
    * Otwiera plik i ładuje obrazek.
    */
   public void openFile()
   {
      JFileChooser chooser = new JFileChooser();
      chooser.setCurrentDirectory(new File("."));
      String[] extensions = ImageIO.getReaderFileSuffixes();
      chooser.setFileFilter(new FileNameExtensionFilter("Image files", extensions));
      int r = chooser.showOpenDialog(this);
      if (r != JFileChooser.APPROVE_OPTION) return;

      try
      {
         Image img = ImageIO.read(chooser.getSelectedFile());
         image = new BufferedImage(img.getWidth(null), img.getHeight(null),
               BufferedImage.TYPE_INT_RGB);
         image.getGraphics().drawImage(img, 0, 0, null);
      }
      catch (IOException e)
      {
         JOptionPane.showMessageDialog(this, e);
      }
      repaint();
   }

   /**
    * Stosuje filtr obrazu i odrysowuje obraz.
      @param op rodzaj przekształcenia
    */
   private void filter(BufferedImageOp op)
   {
      if (image == null) return;
      image = op.filter(image, null);
      repaint();
   }

   /**
    * Wykonuje operację splotu i odrysowuje obraz.
      @param elements jądro splotu (tablica zawierająca 9 elementów macierzy)
    */
   private void convolve(float[] elements)
   {
      Kernel kernel = new Kernel(3, 3, elements);
      ConvolveOp op = new ConvolveOp(kernel);
      filter(op);
   }

   private BufferedImage image;
   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 400;
}
