ColorApp.java Source code

Introduction

Here is the source code for ColorApp.java

Source

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ByteLookupTable;
import java.awt.image.LookupOp;
import java.awt.image.LookupTable;
import java.awt.image.ShortLookupTable;

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

public class ColorApp extends JFrame {
    DisplayPanel displayPanel;

    JButton brightenButton, darkenButton, contrastIncButton, contrastDecButton, reverseButton, resetButton;

    public ColorApp() {
        super();
        Container container = getContentPane();

        displayPanel = new DisplayPanel();
        container.add(displayPanel);

        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(3, 2));
        panel.setBorder(new TitledBorder("Click a Button to Perform the Associated Operation and Reset..."));

        brightenButton = new JButton("Brightness >>");
        brightenButton.addActionListener(new ButtonListener());
        darkenButton = new JButton("Darkness >>");
        darkenButton.addActionListener(new ButtonListener());
        contrastIncButton = new JButton("Contrast >>");
        contrastIncButton.addActionListener(new ButtonListener());
        contrastDecButton = new JButton("Contrast <<");
        contrastDecButton.addActionListener(new ButtonListener());
        reverseButton = new JButton("Negative");
        reverseButton.addActionListener(new ButtonListener());
        resetButton = new JButton("Reset");
        resetButton.addActionListener(new ButtonListener());

        panel.add(brightenButton);
        panel.add(darkenButton);
        panel.add(contrastIncButton);
        panel.add(contrastDecButton);
        panel.add(reverseButton);
        panel.add(resetButton);

        container.add(BorderLayout.SOUTH, panel);

        addWindowListener(new WindowEventHandler());
        setSize(displayPanel.getWidth(), displayPanel.getHeight() + 25);
        show();
    }

    class WindowEventHandler extends WindowAdapter {
        public void windowClosing(WindowEvent e) {
            System.exit(0);
        }
    }

    public static void main(String arg[]) {
        new ColorApp();
    }

    class ButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            JButton button = (JButton) e.getSource();

            if (button.equals(brightenButton)) {
                displayPanel.brightenLUT();
                displayPanel.applyFilter();
                displayPanel.repaint();
            } else if (button.equals(darkenButton)) {
                displayPanel.darkenLUT();
                displayPanel.applyFilter();
                displayPanel.repaint();
            } else if (button.equals(contrastIncButton)) {
                displayPanel.contrastIncLUT();
                displayPanel.applyFilter();
                displayPanel.repaint();
            } else if (button.equals(contrastDecButton)) {
                displayPanel.contrastDecLUT();
                displayPanel.applyFilter();
                displayPanel.repaint();
            } else if (button.equals(reverseButton)) {
                displayPanel.reverseLUT();
                displayPanel.applyFilter();
                displayPanel.repaint();
            } else if (button.equals(resetButton)) {
                displayPanel.reset();
                displayPanel.repaint();
            }
        }
    }
}

class DisplayPanel extends JPanel {
    Image displayImage;

    BufferedImage bi;

    Graphics2D big;

    LookupTable lookupTable;

    DisplayPanel() {
        setBackground(Color.black); // panel background color
        loadImage();
        setSize(displayImage.getWidth(this), displayImage.getWidth(this)); // panel
        createBufferedImage();
    }

    public void loadImage() {
        displayImage = Toolkit.getDefaultToolkit().getImage("largeJava2sLogo.jpg");
        MediaTracker mt = new MediaTracker(this);
        mt.addImage(displayImage, 1);
        try {
            mt.waitForAll();
        } catch (Exception e) {
            System.out.println("Exception while loading.");
        }

        if (displayImage.getWidth(this) == -1) {
            System.out.println("No jpg file");
            System.exit(0);
        }
    }

    public void createBufferedImage() {
        bi = new BufferedImage(displayImage.getWidth(this), displayImage.getHeight(this),
                BufferedImage.TYPE_INT_ARGB);

        big = bi.createGraphics();
        big.drawImage(displayImage, 0, 0, this);
    }

    public void brightenLUT() {
        short brighten[] = new short[256];
        for (int i = 0; i < 256; i++) {
            short pixelValue = (short) (i + 10);
            if (pixelValue > 255)
                pixelValue = 255;
            else if (pixelValue < 0)
                pixelValue = 0;
            brighten[i] = pixelValue;
        }
        lookupTable = new ShortLookupTable(0, brighten);
    }

    public void darkenLUT() {
        short brighten[] = new short[256];
        for (int i = 0; i < 256; i++) {
            short pixelValue = (short) (i - 10);
            if (pixelValue > 255)
                pixelValue = 255;
            else if (pixelValue < 0)
                pixelValue = 0;
            brighten[i] = pixelValue;
        }
        lookupTable = new ShortLookupTable(0, brighten);
    }

    public void contrastIncLUT() {
        short brighten[] = new short[256];
        for (int i = 0; i < 256; i++) {
            short pixelValue = (short) (i * 1.2);
            if (pixelValue > 255)
                pixelValue = 255;
            else if (pixelValue < 0)
                pixelValue = 0;
            brighten[i] = pixelValue;
        }
        lookupTable = new ShortLookupTable(0, brighten);
    }

    public void contrastDecLUT() {
        short brighten[] = new short[256];
        for (int i = 0; i < 256; i++) {
            short pixelValue = (short) (i / 1.2);
            if (pixelValue > 255)
                pixelValue = 255;
            else if (pixelValue < 0)
                pixelValue = 0;
            brighten[i] = pixelValue;
        }
        lookupTable = new ShortLookupTable(0, brighten);
    }

    public void reverseLUT() {
        byte reverse[] = new byte[256];
        for (int i = 0; i < 256; i++) {
            reverse[i] = (byte) (255 - i);
        }
        lookupTable = new ByteLookupTable(0, reverse);
    }

    public void reset() {
        big.setColor(Color.black);
        big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
        big.drawImage(displayImage, 0, 0, this);
    }

    public void applyFilter() {
        LookupOp lop = new LookupOp(lookupTable, null);
        lop.filter(bi, bi);
    }

    public void update(Graphics g) {
        g.clearRect(0, 0, getWidth(), getHeight());
        paintComponent(g);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2D = (Graphics2D) g;
        g2D.drawImage(bi, 0, 0, this);
    }
}