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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package imagegame;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.lang.reflect.Field;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JPanel;
//import javafx.geometry.Rectangle2D;

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.videoio.VideoCapture;

/**
 *
 * @author ruhuayan
 */
public class Camera extends javax.swing.JFrame {

    private ScheduledExecutorService timer;
    private VideoCapture videoCapture;
    private BufferedImage image;
    
    public Camera() {
        super("Camera - click screen to take a picture");
        initComponents();
        
        setLayout(new BorderLayout());
        setLibraryPath();
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        videoCapture = new VideoCapture();
        videoCapture.open(0);

        System.out.println("Camera open: " + videoCapture.isOpened());
        if(videoCapture.isOpened()){
            
            this.addWindowListener(new WindowAdapter(){
                @Override
                public void windowClosing(WindowEvent e) {
                // Implementation here
                
                    stop();
                    System.out.println("Camera released");
                    
                }
            });//end WindowListener
            JPanel cameraJPanel = new JPanel(){
                   @Override
                public void paint(Graphics g) {
                    g.drawImage(image, 0, 0, this);
                }
            };
            cameraJPanel.setPreferredSize(new Dimension(420,500));
            add(cameraJPanel,BorderLayout.NORTH);
            
            Runnable frameGrabber;
            frameGrabber = () -> {
                Mat mat = new Mat();
                videoCapture.read(mat);
            
                image = mat2BufferedImage(mat);
                //g.drawImage(image, 0, 0,this);
                cameraJPanel.repaint();
//              rectList.stream().forEach((Rectangle2D rect) -> {
//                g2d.strokeRect(rect.getMinX(), rect.getMinY(), rect.getWidth(), rect.getHeight());
//            });
            }; //end frameGrabber
            this.timer = Executors.newSingleThreadScheduledExecutor();
            this.timer.scheduleAtFixedRate(frameGrabber, 0, 133, TimeUnit.MILLISECONDS);   
        }else{//if videoCapture.isOpen() is false
//            JOptionPane.showMessageDialog(null, "You have no camera installed");
//            System.exit(1);
        }
    }
    private static void setLibraryPath() {

        try {
            System.setProperty("java.library.path", "lib/");
            Field fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths");
            fieldSysPath.setAccessible(true);
            fieldSysPath.set(null, null);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException ex) {
            throw new RuntimeException(ex);
        }
    }
    public static BufferedImage mat2BufferedImage(Mat mat) {
//        MatOfByte buffer = new MatOfByte();
//        Imgcodecs.imencode(".png", mat, buffer);
        int type = mat.channels() > 1? BufferedImage.TYPE_3BYTE_BGR : BufferedImage.TYPE_BYTE_GRAY;
        BufferedImage image = new BufferedImage(mat.cols(), mat.rows(), type);
        mat.get(0, 0, ((DataBufferByte)image.getRaster().getDataBuffer()).getData());
        return image;
        //return new Image(new ByteArrayInputStream(buffer.toArray()));
    }
    public BufferedImage getCameraImage(){
        return image;
    }
    public void stop(){
        timer.shutdown();
        videoCapture.release();
        try {
            timer.awaitTermination(133, TimeUnit.MILLISECONDS);
                        
        } catch (InterruptedException ex) {
            Logger.getLogger(Camera.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    public boolean isCameraInstalled(){
        return videoCapture.isOpened();
    }
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Camera().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    // End of variables declaration//GEN-END:variables
}