// Project FloodFill

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MyPanel extends JPanel
{
    private boolean[][] array;
    private boolean curveCompleted;
    private int xStart, yStart;

    public MyPanel()
    {
        addMouseMotionListener(new MML());
        addMouseListener(new ML());
        reset();
    }

    public void reset()
    {
        int x, y;
        array = new boolean[80][80];
        for(x = 0; x <= 79; x++)
            for(y = 0; y <= 79; y++)
                array[x][y] = false;
        for(x = 0; x <= 79; x++)
        {
            array[x][0] = true;
            array[x][79] = true;
        }
        for(y = 0; y <= 79; y++)
        {
            array[0][y] = true;
            array[79][y] = true;
        }
        curveCompleted = false;
        repaint();
    }

    public void startFill()
    {
        fill(xStart, yStart);
        repaint();
    }

    public void fill(int x, int y)
    {
        if (!array[x][y])
        {
            array[x][y] = true;
            fill(x + 1, y);  // E
            fill(x, y - 1);  // N
            fill(x - 1, y);  // W
            fill(x, y + 1);  // S
        }
    }

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        int x, y;
        g.setColor(Color.white);
        g.fillRect(0, 0, 400, 450);
        g.setColor(Color.blue);
        for(x = 0; x <= 79; x++)
            for(y = 0; y <= 79; y++)
                if (array[x][y])
                    g.fillRect(5*x, 5*y, 5, 5);
        if (curveCompleted)
        {
            g.setColor(Color.red);
            g.fillRect(5*xStart, 5*yStart, 5, 5);
        }
    }

    private class MML implements MouseMotionListener
    {
        public void mouseDragged(MouseEvent e)
        {
            int x, y;
            x = e.getX() / 5;
            y = e.getY() / 5;
            if (!array[x][y])
            {
                array[x][y] = true;
                repaint();
            }
        }

        public void mouseMoved(MouseEvent e) {}
    }

    private class ML implements MouseListener
    {
        public void mouseReleased(MouseEvent e)
        {
            if (curveCompleted)
            {
                xStart = e.getX() / 5;
                yStart = e.getY() / 5;
                repaint();
            }
            else
                curveCompleted = true;
        }

        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {}
        public void mouseClicked(MouseEvent e) {}
    }
}