Friday 27 April 2012

Dragging image in java

Draging Image dragme.java

import javax.swing.JFrame;
public class dragme extends JFrame{
 
 public dragme(){
  
  add(new dragged());
  
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(600, 600);
        setLocationRelativeTo(null);
        setTitle("Dragging App");

        setResizable(false);
        setVisible(true);
  
 }
 
 public static void main(String[] args){
  new dragme();
 }
 
}


Dragged Image Class dragged.java

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.*;

import javax.swing.*;

public class dragged extends JPanel implements MouseMotionListener, MouseListener {
 private Image Dragged;
 private Image background;
 private static int x_coord = 150;
 private static int y_coord = 150;
 private boolean isdragged;
 private static int x_dragFrom = 0;
 private static int y_dragFrom = 0;
 public dragged(){
  
  setPreferredSize(new Dimension(300,300));
  setBackground(Color.WHITE);
  this.addMouseMotionListener(this);
  this.addMouseListener(this);
  LoadImage();
  
 }
 
 public void LoadImage(){
  
  Dragged = new ImageIcon("C:\\javapics\\deneme.png").getImage();
  background = new ImageIcon("C:\\javapics\\daaad.png").getImage();
 }
 
 public void paintComponent(Graphics g){
  
  super.paintComponent(g);
  g.drawImage(background, 0, 0, null);
  g.drawImage(Dragged, x_coord, y_coord, this);
  
 }
 public void mousePressed(MouseEvent e) {
        int x = e.getX();   // Save the x coord of the click
        int y = e.getY();   // Save the y coord of the click
        
        if (x >= x_coord && x <= (x_coord + Dragged.getWidth(null))
                && y >= y_coord && y <= (y_coord + Dragged.getWidth(null))) {
            isdragged = true;
            x_dragFrom = x - x_coord;  // how far from left
            y_dragFrom = y - y_coord;  // how far from top
        } else {
            isdragged = false;
        }
    }
  public void mouseDragged(MouseEvent e) {
         if (isdragged) {  
            
             x_coord = e.getX() - x_dragFrom;//to better dragging view
             y_coord = e.getY() - y_dragFrom;//to better dragging view
             
            //to prevent overflow left and right side
             x_coord  = Math.max(x_coord , 0);
             x_coord  = Math.min(x_coord , getWidth() - Dragged.getWidth(null));
             
             //to prevent overflow up and down side
             y_coord  = Math.max(y_coord , 0);
             y_coord  = Math.min(y_coord , getHeight() - Dragged.getHeight(null));
             
             this.repaint(); // Repaint because position changed.
         }
     }

     //we should change isdragged variable when mouse released for dragging
     public void mouseExited(MouseEvent e) {
         isdragged = false;
     }

     public void mouseMoved   (MouseEvent e) {}  // ignore these events
     public void mouseEntered (MouseEvent e) {}  // ignore these events
     public void mouseClicked (MouseEvent e) {}  // ignore these events
     public void mouseReleased(MouseEvent e) {}  // ignore these events
}

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