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package opencvtutorial;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.Image;

import javax.swing.BoxLayout;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JSlider;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

import org.opencv.core.Core;

import org.opencv.core.Mat;

import org.opencv.highgui.HighGui;

import org.opencv.imgcodecs.Imgcodecs;

import org.scijava.nativelib.NativeLoader;

public class AddingImages {

static {

try {

// Load the native OpenCV library

NativeLoader.loadLibrary(Core.NATIVE_LIBRARY_NAME);

} catch (Exception e) {

}

}

private static final int ALPHA_SLIDER_MAX = 100;

private int alphaVal = 0;

private Mat matImgSrc1;

private Mat matImgSrc2;

private Mat matImgDst = new Mat();

private JFrame frame;

private JLabel imgLabel;

public AddingImages(String[] args) {

// ! [load]

String imagePath1 = "data/LinuxLogo.jpg";

String imagePath2 = "data/WindowsLogo.jpg";

if (args.length > 1) {

imagePath1 = args[0];

imagePath2 = args[1];

}

matImgSrc1 = Imgcodecs.imread(imagePath1);

matImgSrc2 = Imgcodecs.imread(imagePath2);

// ! [load]

if (matImgSrc1.empty()) {

System.out.println("Empty image: " + imagePath1);

System.exit(0);

}

if (matImgSrc2.empty()) {

System.out.println("Empty image: " + imagePath2);

System.exit(0);

}

// ! [window]

// Create and set up the window.

frame = new JFrame("Linear Blend");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Set up the content pane.

Image img = HighGui.toBufferedImage(matImgSrc2);

addComponentsToPane(frame.getContentPane(), img);

// Use the content pane's default BorderLayout. No need for

// setLayout(new BorderLayout());

// Display the window.

frame.pack();

frame.setVisible(true);

// ! [window]

}

private void addComponentsToPane(Container pane, Image img) {

if (!(pane.getLayout() instanceof BorderLayout)) {

pane.add(new JLabel("Container doesn't use BorderLayout!"));

return;

}

JPanel sliderPanel = new JPanel();

sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.PAGE_AXIS));

// ! [create_trackbar]

sliderPanel.add(new JLabel(String.format("Alpha x %d", ALPHA_SLIDER_MAX)));

JSlider slider = new JSlider(0, ALPHA_SLIDER_MAX, 0);

slider.setMajorTickSpacing(20);

slider.setMinorTickSpacing(5);

slider.setPaintTicks(true);

slider.setPaintLabels(true);

// ! [create_trackbar]

// ! [on_trackbar]

slider.addChangeListener(new ChangeListener() {

@Override

public void stateChanged(ChangeEvent e) {

JSlider source = (JSlider) e.getSource();

alphaVal = source.getValue();

update();

}

});

// ! [on_trackbar]

sliderPanel.add(slider);

pane.add(sliderPanel, BorderLayout.PAGE_START);

imgLabel = new JLabel(new ImageIcon(img));

pane.add(imgLabel, BorderLayout.CENTER);

}

private void update() {

double alpha = alphaVal / (double) ALPHA_SLIDER_MAX;

double beta = 1.0 - alpha;

Core.addWeighted(matImgSrc1, alpha, matImgSrc2, beta, 0, matImgDst);

Image img = HighGui.toBufferedImage(matImgDst);

imgLabel.setIcon(new ImageIcon(img));

frame.repaint();

}

public static void main(String[] args) {

// Schedule a job for the event dispatch thread:

// creating and showing this application's GUI.

javax.swing.SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

new AddingImages(args);

}

});

}

}