package controlball;
import controlball.ControlBall.BallCanvas;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class cb extends JFrame{
    private JButton jbtEnlarge = new JButton("Enlarge");
    private JButton jbtShrink = new JButton("Shrink");
    private BallCanvas canvas = new BallCanvas();
    public cb(){
        JPanel panel = new JPanel();
        panel.add(jbtEnlarge);
        panel.add(jbtShrink);
        this.add(canvas, BorderLayout.CENTER);
        this.add(panel, BorderLayout.SOUTH);
        jbtEnlarge.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent e){
                    canvas.enlarge();
                }
        });
        jbtShrink.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent e){
                    canvas.shrink();
                }
        });
    }
}
public class ControlBall {
    public static void main(String[] args) {
        JFrame frame = new cb();
        frame.setTitle("ControllBall");
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1920,1080);
        frame.setVisible(true);
    }
    public static class BallCanvas extends JPanel{
        BallCanvas(){

        }
        private int radious = 5;
        public void enlarge(){
            radious += 1;
            repaint();
        }
        public void shrink(){
            radious -= 1;
            repaint();
        }
        protected void paintComponent(Graphics g){
            super.paintComponent(g);
            g.drawOval(getWidth()/2 - radious, getHeight()/2 - radious, 2*radious, 2*radious);

        }

    }
}