// Digitize.java
//      get cooddinates from .gif  .jpg  .png  images 
//      rename and edit output file to suit your needs

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.io.*;
import javax.swing.*;

public class Digitize extends JFrame
{
  MyJPanel panel;
  private JDesktopPane theDesktop;
  ImageIcon imageActive = new ImageIcon(" "); // selected
  Dimension dimActive;
  int Pwidth = 800;
  int Pheight = 800;
  int point = 0; // x0,y0  x1,y0  x0,y1
  int x00=0, y00=0, x10=0, y10=0, x01=0, y01=0;
  String action = new String("click start");
  String file_name;

  public Digitize(String temp_name)
  {
    file_name = temp_name;
    setTitle("Digitize demonstration");
    setSize(Pwidth+10,Pheight+10);
    setBackground(Color.white);
    setForeground(Color.black);

    // create menu bar and attach it to AwtMenuTest window
    JMenuBar bar = new JMenuBar();  
    setJMenuBar(bar);  

    // set up Image menu
    JMenu imageMenu = new JMenu("Start");
    bar.add(imageMenu);  // add drop downs to menu bar
    // set up image types
    JMenuItem gifItem = new JMenuItem("sample p1.gif");
    imageMenu.add(gifItem);
    JMenuItem jpgItem = new JMenuItem("sample curve.jpg");
    imageMenu.add(jpgItem);
    JMenuItem jpg2Item = new JMenuItem("sample c6thrust.jpg");
    imageMenu.add(jpg2Item);
    JMenuItem pngItem = new JMenuItem("sample chess2.png");
    imageMenu.add(pngItem);
    JMenuItem fileItem = new JMenuItem("file");
    imageMenu.add(fileItem);

    // set up display area
    theDesktop = new JDesktopPane();
    getContentPane().add(theDesktop);
    // Create internal frame
    JInternalFrame frame = new JInternalFrame(
        "Digitize area", true, true, true, true);
    // attach panel to internal frame
    Container container = frame.getContentPane();
    panel = new MyJPanel();
    container.add(panel, BorderLayout.CENTER);
    // set size of internal frame to size of its contents
    frame.pack(); // uses class Dimension
    theDesktop.add(frame);
    panel.addMouseListener (new mousePressHandler());
    frame.setVisible(true);

    gifItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent event)
            { System.out.println("Image p1.gif");
              // load image
              imageActive = new ImageIcon( "p1.gif" );
              dimActive = new Dimension( imageActive.getIconWidth(),
                                         imageActive.getIconHeight() );  
              System.out.println("imageGif dimension = "+dimActive); // debug print
              System.out.println("click on x=0, y=0 point");
              action = new String("click on 0,0 point"); 
              panel.repaint();
          }});
    jpgItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent event)
            { System.out.println("Image curve.jpg");
              // load image
              imageActive = new ImageIcon( "curve.jpg" );
              dimActive = new Dimension( imageActive.getIconWidth(),
                                         imageActive.getIconHeight() );  
              System.out.println("imageJpg dimension = "+dimActive); // debug print
              System.out.println("click on x=0, y=0 point");
              action = new String("click on 0,0 point"); 
              panel.repaint();
          }});
    jpg2Item.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent event)
            { System.out.println("Image c6thrust.jpg");
              // load image
              imageActive = new ImageIcon( "c6thrust.jpg" );
              dimActive = new Dimension( imageActive.getIconWidth(),
                                         imageActive.getIconHeight() );  
              System.out.println("imageJpg dimension = "+dimActive); // debug print
              System.out.println("click on x=0, y=0 point");
              action = new String("click on 0,0 point"); 
              panel.repaint();
          }});
    pngItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent event)
            { System.out.println("Image chess2.png");
              // load image
              imageActive = new ImageIcon( "chess2.png" );
              dimActive = new Dimension( imageActive.getIconWidth(),
                                         imageActive.getIconHeight() );  
              System.out.println("imagePng dimension = "+dimActive); // debug print
              System.out.println("click on x=0, y=0 point");
              action = new String("click on 0,0 point"); 
              panel.repaint();
          }});
    fileItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent event)
            { System.out.println("Image "+file_name);
              // load image from file
              imageActive = new ImageIcon( file_name );
              dimActive = new Dimension( imageActive.getIconWidth(),
                                         imageActive.getIconHeight() );  
              System.out.println("imagefile dimension = "+dimActive); // debug print
              System.out.println("click on x=0, y=0 point");
              action = new String("click on 0,0 point"); 
              panel.repaint();
          }});
    addWindowListener(new WindowAdapter()
    {
      public void windowClosing(WindowEvent e)
      {
        System.exit(0);
      }
    });
    setVisible(true);
  } // end constructor Digitize

  class mousePressHandler extends MouseAdapter
  {
    public void mousePressed (MouseEvent e)
    {
      int xp, yp, b;
      int width, height;
      double x, y;

      width = getSize().width;
      height = getSize().height;
      if(point==0) System.out.println("width="+width+",  height="+height);

      xp = e.getX();
      yp = e.getY();
      b = e.getButton();
      if(b==1) // left button        
      {
	requestFocus();
        if(point==0)
	{
	  System.out.println("0,0 at x="+xp+", y="+yp);
          x00 = xp;
          y00 = yp;
          point++;
          System.out.println("click on x=1, y=0 point");
          action = new String("click on 1,0 point"); 
	}
        else if(point==1)
	{
	  System.out.println("1,0 at x="+xp+", y="+yp);
          x10 = xp;
          y10 = yp;
          point++;
          System.out.println("click on x=0, y=1 point");
          action = new String("click on 0,1 point"); 
	}
        else if(point==2)
	{
	  System.out.println("0,1 at x="+xp+", y="+yp);
          x01 = xp;
          y01 = yp;
          point++;
          System.out.println("digitize desired points");
          action = new String("digitize desired points"); 
	}
        else
	{
	  System.out.println("point at x="+xp+", y="+yp);
          x = (double)(xp-x00)/(double)(x10-x00);
          y = (double)(yp-y00)/(double)(y01-y00);
          System.out.println(x+" "+y);
	}
      }

      panel.repaint();
    }
  } // end mousePressHandler

  class MyJPanel extends JPanel
  {
    ImageIcon imageLocal;

    public void paintComponent(Graphics g)
    {
      // g.clearRect(0, 0, Pwidth, Pheight-100); // cover non-erase bug
      g.setColor(Color.red);

      super.paintComponent( g );
      // display image
      imageLocal = imageActive;
      imageLocal.paintIcon( this, g, 0, 0 );
      g.drawString(action, 10, Pheight-100);

    } // end paintComponent

    // return dimensions for sizing
    public Dimension getPreferredSize()
    {
      return new Dimension(Pwidth-15, Pheight-90);
    }
  } // end MyJPanel

  public static void main (String[] args) // optional file
  {
    String temp_name = new String("none specified");
    if(args.length>0) temp_name = args[0];
    new Digitize(temp_name);
  } // end main
} // end class Digitize