Java scale image

Sephiroth_by_Wen_JR.jpg

Complete source code below will show you, how to scale an image in java using AffineTransform class. It will scale base on x and y axis.

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COMPLETE SOURCE CODE FOR : ScaleImage.java
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import java.awt.Image;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.BorderLayout;
import java.awt.Dimension;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.awt.geom.AffineTransform;

import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.ImageIcon;

public class ScaleImage extends JPanel implements ActionListener
{
 JScrollPane scrollBar;
 JPanel panelB;
 JButton button;
 JTextField textFieldX;
 JTextField textFieldY;
 JFrame myWindow;
 ImageIcon ii;
 
 AffineTransform at=new AffineTransform();
 
 Image myImage;
 
 double x=0.3;
 double y=0.3;
 
 public ScaleImage()
 {
  //CHANGE Sephiroth_by_Wen_JR.jpg TO IMAGE THAT YOU WANT
  myImage=Toolkit.getDefaultToolkit().getImage("Sephiroth_by_Wen_JR.jpg");
    
  ii=new ImageIcon(myImage);
  
  JLabel labelX=new JLabel("X : ");
  JLabel labelY=new JLabel("Y : ");
  textFieldX=new JTextField("0.3",10);
  textFieldY=new JTextField("0.3",10);
  button=new JButton("Refresh");
  
  button.addActionListener(this);
  
  panelB=new JPanel();
  panelB.add(labelX);
  panelB.add(textFieldX);
  panelB.add(labelY);
  panelB.add(textFieldY);
  panelB.add(button);
  
  setPreferredSize(new Dimension((int)(ii.getIconWidth()*x),(int)(ii.getIconHeight()*y)));
  scrollBar=new JScrollPane(this);
  
  myWindow=new JFrame("Scale image");
  myWindow.getContentPane().setLayout(new BorderLayout());  
  myWindow.getContentPane().add(scrollBar,BorderLayout.CENTER);
  myWindow.getContentPane().add(panelB,BorderLayout.SOUTH); 
  myWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  myWindow.setSize(500,500);
  myWindow.setLocationRelativeTo(null);
  myWindow.setVisible(true);
 }
 
 public void actionPerformed(ActionEvent e)
 {
  if(e.getSource()==button)
  {
   x=Double.parseDouble(textFieldX.getText());
   y=Double.parseDouble(textFieldY.getText());
   
   setPreferredSize(new Dimension((int)(ii.getIconWidth()*x),(int)(ii.getIconHeight()*y)));
   
   myWindow.repaint();
   scrollBar.revalidate();
  }
 }
 
 public void paint(Graphics g)
 {
   at.setToScale(x,y);
   Graphics2D g2d=(Graphics2D)g;
   g2d.drawImage(myImage,at,this);
 }
 
 public static void main(String[]args)
 {
  ScaleImage si=new ScaleImage();
 }
}

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JUST COMPILE AND EXECUTE
Note : Make sure Sephiroth_by_Wen_JR.jpg locate at same location with this source file
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