Java Swing Tutorial - Java Image.getScaledInstance(int width, int height, int hints)

Syntax

Image.getScaledInstance(int width, int height, int hints) has the following syntax.

public Image getScaledInstance(int width,   int height,   int hints)

Example

In the following code shows how to use Image.getScaledInstance(int width, int height, int hints) method.

/* w ww .  j ava  2s  .  c om*/


import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JFrame implements ActionListener {
  Image img;

  JButton getPictureButton  = new JButton("Get Picture");

  public static void main(String[] args) {
    new Main();
  }

  public Main() {
    this.setSize(300, 300);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel picPanel = new PicturePanel();
    this.add(picPanel, BorderLayout.CENTER);

    JPanel buttonPanel = new JPanel();
    getPictureButton.addActionListener(this);
    buttonPanel.add(getPictureButton);
    this.add(buttonPanel, BorderLayout.SOUTH);

    this.setVisible(true);
  }

  public void actionPerformed(ActionEvent e) {
    String file = "a.png";
    if (file != null) {
      Toolkit kit = Toolkit.getDefaultToolkit();
      img = kit.getImage(file);
      img = img.getScaledInstance(300, -1, Image.SCALE_SMOOTH);
      this.repaint();
    }
  }
  class PicturePanel extends JPanel {
    public void paint(Graphics g) {
      g.drawImage(img, 0, 0, this);
    }
  }

}