Desktop : OpenCV Fill Poly With Mouse Control

<h5>Goal</h5>
Test OpenCV fill poly with mouse control.

```OpenCV_FillPolyWithMouseControl.java
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;

import org.opencv.core.MatOfPoint;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class OpenCV_FillPolyWithMouseControl {

    static{System.loadLibrary(Core.NATIVE_LIBRARY_NAME);}
    private JFrame frmjavaSwing;

    public List<Point> allPoint = new ArrayList<>();

    /**
     *  Launch the application.
     */
    public static void main(String[] args){

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try{
                    OpenCV_FillPolyWithMouseControl window = new OpenCV_FillPolyWithMouseControl();
                    window.frmjavaSwing.setVisible(true);
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     *  Create the application.
     */
    public OpenCV_FillPolyWithMouseControl() {
        initialize();
    }

    /**
     *  Init the contents of the frame.
     */
    private void initialize() {
        final Mat source = Imgcodecs.imread(
                "D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\DSC_0625.jpg");

        BufferedImage image=matToBufferedImage(source);

        frmjavaSwing = new JFrame();
        frmjavaSwing.setTitle("多邊形填充使用滑鼠練習");
        frmjavaSwing.setBounds(100, 100, 491, 425);
        frmjavaSwing.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmjavaSwing.getContentPane().setLayout(null);

        final JLabel lblLocation = new JLabel("");
        lblLocation.setBounds(10, 10, 112, 25);
        frmjavaSwing.getContentPane().add(lblLocation);

        final JLabel lblLocation2 = new JLabel("");
        lblLocation2.setBounds(158, 10, 112, 25);
        frmjavaSwing.getContentPane().add(lblLocation2);

        JPanel panel = new JPanel();
        panel.setBounds(10, 45, 429, 348);
        frmjavaSwing.getContentPane().add(panel);

        final JLabel lblNewLabel = new JLabel("");
        panel.add(lblNewLabel);


        lblNewLabel.setIcon(new ImageIcon(image));



        lblNewLabel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                lblLocation2.setText("");
                lblLocation.setText("加入點:X:"+arg0.getX()+",Y:"+arg0.getY());

                BufferedImage newImage=matToBufferedImage(paintPointAndFillPoly(arg0.getX(),arg0.getY()));
                lblNewLabel.setIcon(new ImageIcon(newImage));
            }
        });
    }

    public Mat paintPointAndFillPoly(int x,int y){
        Mat src = Imgcodecs.imread("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\DSC_0625.jpg");

        List<Point> allPoint=getAllPoint();
        allPoint.add(new Point(x,y));
        //畫滑鼠點擊的點
        Imgproc.circle(src, new Point(x,y), 2, new Scalar(0,55,255),2);

        //畫出FillPoly
        if(allPoint.size()>=2){
            MatOfPoint mop1=new MatOfPoint();
            List<MatOfPoint> allMatOfPoint=new ArrayList<MatOfPoint>();
            mop1.fromList(allPoint);
            allMatOfPoint.add(mop1);
            Imgproc.fillPoly(src, allMatOfPoint,  new Scalar(255,255,255));

        }
        return src;
    }

    public BufferedImage matToBufferedImage(Mat matrix) {
        int cols = matrix.cols();
        int rows = matrix.rows();
        int elemSize = (int)matrix.elemSize();
        byte[] data = new byte[cols * rows * elemSize];
        int type;
        matrix.get(0, 0, data);
        switch (matrix.channels()) {
            case 1:
                type = BufferedImage.TYPE_BYTE_GRAY;
                break;
            case 3:
                type = BufferedImage.TYPE_3BYTE_BGR;
                // bgr to rgb
                byte b;
                for(int i=0; i<data.length; i=i+3) {
                    b = data[i];
                    data[i] = data[i+2];
                    data[i+2] = b;
                }
                break;
            default:
                return null;
        }
        BufferedImage image2 = new BufferedImage(cols, rows, type);
        image2.getRaster().setDataElements(0, 0, cols, rows, data);
        return image2;
    }

    public List<Point> getAllPoint() {
        return allPoint;
    }

    public void setAllPoint(List<Point> allPoint) {
        this.allPoint = allPoint;
    }

}
```
<h5>Result</h5>
![opencv_fill_poly_with_mouse_control.JPG](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/276243/aeff9621-8325-e643-0c33-7af8014116be.jpeg)