package javaapplication6;

import javax.swing.JFrame;

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;

class Ekran extends Canvas {

    public String s;

    private int x, y;
    ArrayList<Point> points = new ArrayList<Point>();

    Ekran() {
        super();
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent me) {

                x = me.getX();
                y = me.getY();
                points.add(new Point(x, y));
                repaint();  }
  }); }

    @Override
    public void paint(Graphics g) {
        int x2, y2;
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.RED);
        for (Point p : points) {
            x2 = (int) p.getX();
            y2 = (int) p.getY();
            g2.fillOval(x2, y2, 100, 100);
        } }}

public class Komunikator extends JFrame {

    Komunikator(String nazwa) {
        super(nazwa);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public static void main(String args[]) {
        Komunikator okno = new Komunikator("Komunikator");
        okno.setSize(600, 500);
        Ekran e = new Ekran();
        okno.add(e);
        okno.setVisible(true);
    }
}// koniec public class Komunikator