import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class ScaleImageTest1 extends JFrame {
    
    private double scaleFactor = 1.0;
    
    private BufferedImage sourceImage;
    JPanel panel;
    JSlider slider;
    public Graphics g;
    
    public ScaleImageTest1() {
        super("ScaleImageTest");
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
       
        try {
            sourceImage = ImageIO.read(new File("duke_skateboard.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        createPanel();
        createSlider();
        addComponents();
    }
    
    
    public void  createPanel(){
        panel = new JPanel(){
            public void paintComponent(Graphics g) {
                
                Dimension panelSize = getSize();
                int width = panelSize.width;
                int height = panelSize.height;
                
                //g.setColor(Color.WHITE);
                g.fillRect(0, 0, width, height);
                //g.setColor(Color.BLACK);
                
                int imageWidth = (int) (sourceImage.getWidth() * scaleFactor);
                int imageHeight = (int) (sourceImage.getHeight() * scaleFactor);
                int imageX = width / 2 - imageWidth / 2;
                int imageY = height / 2 - imageHeight / 2;
                
                Image image = sourceImage.getScaledInstance(
                        imageWidth, imageHeight, Image.SCALE_SMOOTH);
                
                g.drawImage(image, imageX, imageY, null);
            }
      };
   }
    
    public void createSlider(){
        slider = new JSlider(0, 200);
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                int value = slider.getValue();
                
                if (value > 0) {
                    scaleFactor = (double) value / 100.0;
                    repaint();
                }
            }
        });
    }
    
    public void addComponents(){
        getContentPane().add(panel, BorderLayout.CENTER);
        getContentPane().add(slider, BorderLayout.SOUTH);
    }
    
    public static void main(String[] args) {
        
        final JFrame frame = new ScaleImageTest1();
        
        final Dimension frameSize = new Dimension(600, 400);
        
        frame.setSize(frameSize);
        
        Toolkit.getDefaultToolkit().getScreenSize();
        
        frame.setVisible(true);
        
    }
    
}