Jaba 12 - 9

package labs;

import java.lang.Math;
import java.util.ArrayList;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;

public class MyClass extends JFrame implements MouseListener {
    public MyClass() {
        Dimension d = new Dimension(600, 600);
        setSize(d);
        setTitle("Lab12");
        setLocation(150, 350);
        addMouseListener(this);
        getContentPane().setBackground(Color.WHITE);
    }

    public ArrayList<MouseEvent> backup = new ArrayList<MouseEvent>();

    public static void main(String[] args) {
        MyClass w = new MyClass();
        w.setVisible(true);
    }

    private void eventToDo(MouseEvent event) {
        backup.add(event);
        Graphics g = getGraphics();
        paint(g);
    }

    public void drawMyPolygon(MouseEvent event, Graphics g) {
        double X = event.getX(),
               Y = event.getY(),
               R = 15;
        int N = 4;
        int[] xs = new int[N], ys = new int[N];
        double angle;

        for (int i = 0; i < N; i++)
        {
            angle = 2*Math.PI*i/N;
            xs[i] = (int)(R*Math.cos(angle)+X);
            ys[i] = (int)(R*Math.sin(angle)+Y);
        }
        g.setColor(Color.BLUE);
        g.drawPolygon(xs, ys, N);
        //g.fillPolygon(xs, ys, N);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        for (MouseEvent event : backup) {
            drawMyPolygon(event, g);
        }
    }

    public void mouseEntered(MouseEvent event) {}
    public void mouseExited(MouseEvent event) {}
    public void mousePressed(MouseEvent event) {
        if (event.getButton() == MouseEvent.BUTTON2) {
            eventToDo(event);
        }
    }
    public void mouseReleased(MouseEvent event) {}
    public void mouseClicked(MouseEvent event) {}
}