[resolved] Java get Mouse coordinates

[jlbovo]

Hello, this is the code I was given to work with. My olny problem is that I am very new to java.

Can some one help and tell me where I would put a MouseListener so I could get the current X-Y co-od's of the point when the mouse is clicked....but only after i load both (left/right) images ?? it would be very helpful.

I think this code is long and complex for a begginner...So it's comming in 2 posts.

Please help and thanks...

[jlbovo]

//---------------------------------------------------------- 
//  UIDDemo1 Code for 3731 User-Interface-Design
//---------------------------------------------------------- 
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;

//----- the UIDDemo1 class ----------------------------------------

public class UIDDemo1 extends JFrame {

// ---- GUI components ---------------------------------------

   private JMenuBar   menuBar;
   private JMenu      fileMenu, toolMenu, helpMenu;
   private JMenuItem  openLeftImageItem, openRightImageItem, saveAsItem, exitItem;
   private JMenuItem  overlayItem, featMatchItem, eyeDistItem, moreFunItem;
   private JMenuItem  aboutItem, documentItem, searchItem;
   private JLabel     leftLabel, rightLabel, resultLabel;
   private JTextField leftDisplay, rightDisplay, resultDisplay;
   private String     fileName;  
   private ImagePanel leftImgPanel, rightImgPanel, resultImgPanel;
   private JPanel     leftP, rightP, resultP; 
   private JFileChooser   fc;

// ---- constructor for static GUI layout  -----------

   public UIDDemo1 () {
     
     super("UIDDemo1");
     Container c = getContentPane();
     ActionEventHandler eh = new ActionEventHandler();
     fc = new JFileChooser();

     //set up file menu
     fileMenu           = new JMenu("File");
     openLeftImageItem  = new JMenuItem("Open Left Image");
     openRightImageItem = new JMenuItem("Open Right Image");
     saveAsItem         = new JMenuItem("Save As");
     exitItem           = new JMenuItem("Exit");
      
     openLeftImageItem.addActionListener(eh);
     openRightImageItem.addActionListener(eh);
     saveAsItem.addActionListener(eh);
     exitItem.addActionListener( new ActionListener() {
           public void actionPerformed(ActionEvent event) {
              System.exit(0);
           }
        }
     );

     fileMenu.add(openLeftImageItem);
     fileMenu.add(openRightImageItem);
     fileMenu.add(saveAsItem);
     fileMenu.add(exitItem);

     //set up tool menu
     toolMenu      = new JMenu("Tools");    
     overlayItem   = new JMenuItem("Overlay Two Images");
     featMatchItem = new JMenuItem("Feature Matching");
     eyeDistItem = new JMenuItem("Eye Distance");
     moreFunItem   = new JMenuItem("More Functions");
     
     overlayItem.addActionListener(eh);
     featMatchItem.addActionListener(eh);
     eyeDistItem.addActionListener(eh);
     moreFunItem.addActionListener(eh);

     toolMenu.add(overlayItem);
     toolMenu.add(featMatchItem);
     toolMenu.add(eyeDistItem);
     toolMenu.add(moreFunItem);

     //set up help menu
     helpMenu     = new JMenu("Help");
     aboutItem    = new JMenuItem("About 3731 User Interface Design");
     documentItem = new JMenuItem("Documents");
     searchItem   = new JMenuItem("Search Index");

     aboutItem.addActionListener(eh);
     documentItem.addActionListener(eh);
     searchItem.addActionListener(eh);

     helpMenu.add(aboutItem);
     helpMenu.add(documentItem);
     helpMenu.add(searchItem);

     //setup the menu bar
     menuBar = new JMenuBar();
     setJMenuBar(menuBar);

     menuBar.add(fileMenu);
     menuBar.add(toolMenu);
     menuBar.add(helpMenu);

     //set image panels
     leftImgPanel   = new ImagePanel();
     rightImgPanel  = new ImagePanel();
     resultImgPanel = new ImagePanel();

     // labels
     leftLabel   = new JLabel("Left Image", JLabel.CENTER);
     rightLabel  = new JLabel("Right Image", JLabel.CENTER);
     resultLabel = new JLabel("Result", JLabel.CENTER);

     //message display fields
     leftDisplay   = new JTextField(30);
     rightDisplay  = new JTextField(30);
     resultDisplay = new JTextField(30);
     leftDisplay.setEditable(false);
     rightDisplay.setEditable(false);
     resultDisplay.setEditable(false);

     // left panel
     leftP = new JPanel();
     leftP.setLayout(new BorderLayout());
     leftP.add(leftLabel, BorderLayout.NORTH);
     leftP.add(new JScrollPane(leftImgPanel), BorderLayout.CENTER);
     leftP.add(leftDisplay, BorderLayout.SOUTH);
     
     // right panel
     rightP = new JPanel();
     rightP.setLayout(new BorderLayout());
     rightP.add(rightLabel, BorderLayout.NORTH);
     rightP.add(new JScrollPane(rightImgPanel), BorderLayout.CENTER);
     rightP.add(rightDisplay, BorderLayout.SOUTH);

     // result panel
     resultP = new JPanel();
     resultP.setLayout(new BorderLayout());
     resultP.add(resultLabel, BorderLayout.NORTH);
     resultP.add(new JScrollPane(resultImgPanel), BorderLayout.CENTER);
     resultP.add(resultDisplay, BorderLayout.SOUTH);

     //add three panels to the contentPane.
     c.setLayout(new GridLayout(1,3));
     c.add(leftP);
     c.add(rightP);
     c.add(resultP);

   } // end of constructor

// -----------------------------------------------------------
   public static void main(String[] args) {     
     UIDDemo1 demo  = new UIDDemo1();
     demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     demo.setSize(1000, 600);
     demo.setVisible(true);
   }

// ---- inner class for event handling  --------------------------

   private class ActionEventHandler implements ActionListener {   
     public void actionPerformed(ActionEvent e) {      
       if( e.getSource() == openLeftImageItem ) {
           fc.setCurrentDirectory(new File("."));
           int result = fc.showOpenDialog(UIDDemo1.this);
           if (result == JFileChooser.APPROVE_OPTION) {
               fileName = fc.getSelectedFile().getPath();
               System.out.println("fileName=   " + fileName);
               leftImgPanel.setImage(fileName);
           } 
       }
       else if( e.getSource() == openRightImageItem ) {
           fc.setCurrentDirectory(new File("."));
           int result = fc.showOpenDialog(UIDDemo1.this);
           if (result == JFileChooser.APPROVE_OPTION) {
               fileName = fc.getSelectedFile().getPath();
               System.out.println("fileName=   " + fileName);
               rightImgPanel.setImage(fileName);
           } 
       }
       else if( e.getSource() == saveAsItem) {
           //resultImgPanel.saveImage();
       }
       else if( e.getSource() == overlayItem) {
           double user_ratio1 = 0.5;
           double user_ratio2 = 0.5;
           resultImgPanel.setImage(resultImgPanel.overlay(leftImgPanel.getImage(), user_ratio1, rightImgPanel.getImage(), user_ratio2));
       }
       else if( e.getSource() == featMatchItem) {
           //method(); 
       }
       else if( e.getSource() == eyeDistItem) {
           JOptionPane.showMessageDialog (UIDDemo1.this,
                                          "ijijmijmpiojmk ",
                                          "UIDDemo1",
                                          JOptionPane.INFORMATION_MESSAGE);
           return;   
       }
       else if( e.getSource() == moreFunItem) {
           //method(); 
       }
       else if( e.getSource() == aboutItem) {
           JOptionPane.showMessageDialog (UIDDemo1.this,
                                          "This is a demo program for 3731-User-Interface-Design. \n Feel free to add new features. ",
                                          "UIDDemo1",
                                          JOptionPane.INFORMATION_MESSAGE);
           return;
       }
       else if( e.getSource() == documentItem) {
           //method(); 
       }
       else if( e.getSource() == searchItem) {
           //method(); 
       }
     }
   } // end of inner class.

} // end of UIDDemo1 class



// -------- A special panel used to show and process images --------------------------

class ImagePanel extends JPanel {

   private BufferedImage currentbufimg; // this is the real image associated with each ImagePanel object.

   // The first time an ImagePanle ojbect is displayed on the window,
   // there is no image --> empty constructor.
   ImagePanel() {
      //System.out.println("empty parameter, doing nothing");
   }

   // Overloaded method setImage(), accepts a string parameter.
   // (1)Create an icon using the fileName.
   // (2)Create a BufferedImage (bufimg) and pass it to setImage method.
   // (3)Inside setImage method, bufimg will be used to update currentbufimg.
   // 
   public boolean setImage(String fileName){
	ImageIcon imgicon = new ImageIcon(fileName);
   	Image img = imgicon.getImage();
	int width  = img.getWidth(this);
	int height = img.getHeight(this);
      System.out.println("width= "  + width);
      System.out.println("height= " + height);

	if(width == -1 || height == -1) 
         return false;

	BufferedImage bufimg     = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	Graphics2D bufimgContext = bufimg.createGraphics();
	bufimgContext.drawImage(img, 0, 0, null);
	setImage(bufimg);

	return true;
   }

........more to come.

[jlbovo]

// (1)Overloaded method, accept a BufferedImage parameter.
   // (2)Update currentbufimg with the passed tembufimg.
   // (3)Show the updated currentbufimg.
   //
   public void setImage(BufferedImage tempbufimg){
	if(tempbufimg==null)
         return;
	this.currentbufimg=tempbufimg;
	Dimension size=new Dimension(tempbufimg.getWidth(this),tempbufimg.getHeight(this));
	setMinimumSize(size); 
      setPreferredSize(size);
	repaint();
   }
   
   public void paintComponent(Graphics g){
	super.paintComponent(g);
	if(currentbufimg != null)
         g.drawImage(currentbufimg,0,0,this);
   }

   public BufferedImage getImage() { 
      return currentbufimg; 
   }

   // overlay method accepts two BufferedImage objects (img1 and img2)
   // and generate a new BufferedImage (img3) by overlaying img1 and img2
   // and return it to the calling method.
   //
   public BufferedImage overlay(BufferedImage img1, double ratio1, BufferedImage img2, double ratio2) {
      int rows = img1.getHeight();
      int cols = img1.getWidth();
	BufferedImage img3 = new BufferedImage(cols, rows, BufferedImage.TYPE_INT_RGB);
      
      WritableRaster wr1 = img1.getRaster();
      WritableRaster wr2 = img2.getRaster();
      WritableRaster wr3 = img3.getRaster();
      
      // 0 for red band, 1 for green band, 2 for blue gand.
      int[] r1 = wr1.getSamples(0,0,cols,rows,0,(int[])null);  
      int[] g1 = wr1.getSamples(0,0,cols,rows,1,(int[])null);  
      int[] b1 = wr1.getSamples(0,0,cols,rows,2,(int[])null);       

      int[] r2 = wr2.getSamples(0,0,cols,rows,0,(int[])null);  
      int[] g2 = wr2.getSamples(0,0,cols,rows,1,(int[])null);
      int[] b2 = wr2.getSamples(0,0,cols,rows,2,(int[])null); 

      int[] r3 = wr3.getSamples(0,0,cols,rows,0,(int[])null);  
      int[] g3 = wr3.getSamples(0,0,cols,rows,1,(int[])null);  
      int[] b3 = wr3.getSamples(0,0,cols,rows,2,(int[])null);  

      int k;
      int minI = 100;
      int maxI = 130;
      int minJ = 100;
      int maxJ = 130;
      for(int i=0; i<rows; i++) {
      for(int j=0; j<cols; j++) {
          k = j + i*cols;
          if (minI<i && i<maxI && minJ<j && j<maxJ) {  // draw a red square.
            r3[k] = 255;
            g3[k] = 0;
            b3[k] = 0;
          }
          else {
            r3[k] = (int)(r1[k]*ratio1 + r2[k]*ratio2);
            g3[k] = (int)(g1[k]*ratio1 + g2[k]*ratio2);
            b3[k] = (int)(b1[k]*ratio1 + b2[k]*ratio2);
          }
          if (i==j) {  // draw a diagnoal line.
            r3[k] = 0;
            g3[k] = 255;
            b3[k] = 0;    
          }
      }
      }

      wr3.setSamples(0,0,cols,rows,0,r3);
      wr3.setSamples(0,0,cols,rows,1,g3);
      wr3.setSamples(0,0,cols,rows,2,b3);

      return img3;
   }
}
// end of ImageShowPanel class

....I just need to know where i Would put something like

//event handler for gettin co-od's
   private class EventHandler implements MouseListener, MouseMotionListener {
 public void mousePressed(MouseEvent e) {
         int newX = e.getX();
         int newY = e.getY();
      }
}

i'm not even sure if thats right, i'm just really looking for some help Thanks for listening.

[ComputerJy]

I hope this is what you are looking for

    this.addMouseListener( new MouseListener()
    {
      public void mouseClicked ( MouseEvent e )
      {
      }

      public void mousePressed ( MouseEvent e )
      {
	int newX = e.getX() ;
	int newY = e.getY() ;
      }

      public void mouseReleased ( MouseEvent e )
      {
      }

      public void mouseEntered ( MouseEvent e )
      {
      }

      public void mouseExited ( MouseEvent e )
      {
      }

    }
    ) ;
    this.addMouseMotionListener( new MouseMotionListener()
    {
      public void mouseDragged ( MouseEvent e )
      {
      }

      public void mouseMoved ( MouseEvent e )
      {
      }

    }
    ) ;

[jlbovo]

ok thanks for the help...now i put that at the end of my ImagePanel class right ?
...and i would need some where to display the coordinates....like

System.out.println("x=   " + newX);
System.out.println("y=   " + newY);

.....to be able to print them out to the system for now.

p.s...how'd u get colour in your code ?

[ComputerJy]

I'm using FireFox with the VBF extension, provided by NoteMe