package nenr.dz5.crtanje;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Crtanje {

    public static void main(String args[]) throws Exception {
        JFrame f = new JFrame("Draw a Red Line");
        f.setSize(300, 300);
        f.setLocation(300, 300);
        f.setResizable(false);
        JPanel p = new JPanel() {
            Point point = null;
            ArrayList<Point> points = new ArrayList<>();
            boolean gotovo = false;
            {
                addMouseListener(new MouseAdapter() {

                    public void mouseReleased(MouseEvent e) {
                        gotovo = true;
                        repaint();
                    }
                });
                addMouseMotionListener(new MouseMotionAdapter() {
                    public void mouseDragged(MouseEvent e) {
                        point = e.getPoint();
                        points.add(point);
                        repaint();
                    }
                });
            }

            public void paint(Graphics g) {
                if (gotovo) {
                    super.paint(g);
                    gotovo = false;
                    try {
                        obradi(points);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    points.clear();
                } else if (point != null) {
                    g.setColor(Color.RED);
                    g.drawLine(point.x, point.y, point.x, point.y);
                }
            }

            void obradi(ArrayList<Point> points) throws IOException {
                ArrayList<Double> x = new ArrayList<>();
                ArrayList<Double> y = new ArrayList<>();
                int sx = 0, sy = 0;
                for (int i = 0; i < points.size(); ++i) {
                    x.add((double) points.get(i).x);
                    y.add((double) points.get(i).y);
                    sx += points.get(i).x;
                    sy += points.get(i).y;
                }
                double midx = (double) sx / points.size();
                double midy = (double) sy / points.size();

                double m = -1;

                for (int i = 0; i < points.size(); ++i) {
                    x.set(i, x.get(i) - midx);
                    y.set(i, y.get(i) - midy);
                    if (Math.abs(x.get(i)) > m) {
                        m = Math.abs(x.get(i));
                    }
                    if (Math.abs(y.get(i)) > m) {
                        m = Math.abs(y.get(i));
                    }
                }
                for (int i = 0; i < points.size(); ++i) {
                    x.set(i, x.get(i) / m);
                    y.set(i, y.get(i) / m);
                }
                int razmak = (points.size() - 1) / 19;
                int pos = 0;
                String s = "";

                BufferedWriter bw = new BufferedWriter(new FileWriter("slova", true));

                for (int i = 0; i < 20; ++i) {
                    s += x.get(pos) + " " + y.get(pos) + " ";
                    pos += razmak;
                }
                s += "0 1 0 0 0\n";
                bw.write(s);
                bw.close();
            }
        };
        f.add(p);
        f.setVisible(true);
    }

}