Projekt. Etap 1 – poruszanie się piłki

Kody źródłowe z odcinka

package pl.am.swing.gra.etap1;

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

public class MyFrame extends JFrame {

    public MyFrame() {
        setTitle("Zdarzenia myszy");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(1000, 800);

        add(new MyComponent());
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            MyFrame myFrame = new MyFrame();
            myFrame.setVisible(true);
        });

    }
}

package pl.am.swing.gra.etap1;

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

public class MyComponent extends JComponent {

    Ball rectangle1 = new Ball();

    public MyComponent() {
        Timer timer = new Timer(40, e -> {
            rectangle1.updatePosition();
            repaint();
        });

        timer.start();
    }

    @Override
    protected void paintComponent(Graphics g) {
        Toolkit.getDefaultToolkit().sync();
        Graphics2D graphics2D = (Graphics2D) g;



        Rectangle limit = new Rectangle(0, 0, Utils.maxWidth, Utils.maxHeight);
        graphics2D.setPaint(Color.CYAN);
        graphics2D.fill(limit);


        graphics2D.setPaint(Color.BLUE);
        graphics2D.fill(rectangle1.getShape());

    }
}

package pl.am.swing.gra.etap1;

import java.awt.*;
import java.awt.geom.Ellipse2D;

public class Ball {
    private int x = 500;
    private int y = 0;
    private int width = 30;
    private int height = 30;
    private int speedX = 5;
    private int speedY = 10;

    public Ball() {
    }

    public Ball(int x, int y, int width, int height, int speedX, int speedY) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.speedX = speedX;
        this.speedY = speedY;
    }

    public void updatePosition() {
        x += speedX;
        y += speedY;

        if (x + width > Utils.maxWidth) {
            x = Utils.maxWidth - width;
            speedX = -speedX;
        }

        if (y + height > Utils.maxHeight) {
            y = Utils.maxHeight - height;
            speedY = -speedY;
        }

        if (x < 0) {
            x = 0;
            speedX = -speedX;
        }

        if (y < 0) {
            y = 0;
            speedY = -speedY;
        }
    }

    public Shape getShape() {
        return new Ellipse2D.Float(x,y, width, height);
    }
}

package pl.am.swing.gra.etap1;

public class Utils {
    public static int maxWidth = 800;
    public static int maxHeight = 600;
}