AngryCircle.java

package lesson5_8.Homework;

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

public class AngryCircle extends JPanel {

    private int xCircle;
    private int yCircle;
    private final int radius = 50;

    MyCircle circle = new MyCircle();

    public AngryCircle() {

        JFrame frame = new JFrame("Angry Circle");
        frame.setMinimumSize(new Dimension(500, 500));
        frame.setLocation(300, 300);
        frame.getContentPane().add(circle);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {

        new AngryCircle();
    }

    private class MyCircle extends JComponent  implements MouseMotionListener {

        public MyCircle() {

            addMouseMotionListener(this);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.GREEN);
            xCircle = (int) (Math.random() * 300);
            yCircle = (int) (Math.random() * 300);
            g.fillOval(xCircle, yCircle, radius, radius);
        }

        @Override
        public void mouseDragged(MouseEvent e) {
        }

        @Override
        public void mouseMoved(MouseEvent e) {

            if (e.getX() > xCircle - 1 && e.getX() < xCircle + radius + 1 &&
                    e.getY() > yCircle - 1 && e.getY() < yCircle + radius + 1 ) {
                repaint();
            }
//            System.out.println(e.getX());
        }
    }
}