ImageFileFilterImageScale.java Source code

Introduction

Here is the source code for ImageFileFilterImageScale.java

Source

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 java.io.File;

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

public class ImageFileFilterImageScale extends JFrame implements ActionListener {
    Image img;

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

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

    public ImageFileFilterImageScale() {
        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 = getImageFile();
        if (file != null) {
            Toolkit kit = Toolkit.getDefaultToolkit();
            img = kit.getImage(file);
            img = img.getScaledInstance(300, -1, Image.SCALE_SMOOTH);
            this.repaint();
        }
    }

    private String getImageFile() {
        JFileChooser fc = new JFileChooser();
        fc.setFileFilter(new ImageFilter());
        int result = fc.showOpenDialog(null);
        File file = null;
        if (result == JFileChooser.APPROVE_OPTION) {
            file = fc.getSelectedFile();
            return file.getPath();
        } else
            return null;

    }

    class PicturePanel extends JPanel {
        public void paint(Graphics g) {
            g.drawImage(img, 0, 0, this);
        }
    }

}

class ImageFilter extends javax.swing.filechooser.FileFilter {
    public boolean accept(File f) {
        if (f.isDirectory())
            return true;
        String name = f.getName();
        if (name.matches(".*((.jpg)|(.gif)|(.png))"))
            return true;
        else
            return false;
    }

    public String getDescription() {
        return "Image files (*.jpg, *.gif, *.png)";
    }
}