SpaceAnimationMain.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;

public class SpaceAnimationMain {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Space Animation");
            SpaceAnimationPanel animationPanel = new SpaceAnimationPanel();
            frame.add(animationPanel);
            frame.setSize(800, 600);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);

            Timer timer = new Timer(50, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    animationPanel.updateAnimation();
                    animationPanel.repaint();
                }
            });
            timer.start();
        });
    }
}

class SpaceAnimationPanel extends JPanel {
    private int width, height;
    private SpaceAnimation.Sun sun;
    private SpaceAnimation.Earth earth;
    private SpaceAnimation.Satellite satellite1, satellite2;
    private double time;

    public SpaceAnimationPanel() {
        setBackground(Color.BLACK);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        width = getWidth();
        height = getHeight();


        if (sun == null || earth == null || satellite1 == null || satellite2 == null) {
            initializeObjects();
        }

        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        sun.draw(g2d);
        earth.draw(g2d);
        satellite1.draw(g2d);
        satellite2.draw(g2d);
    }

    public void initializeObjects() {
        sun = new SpaceAnimation.Sun((double) width / 2, (double) height / 2, 50);
        earth = new SpaceAnimation.Earth((double) width * 3 / 4, (double) height / 2, 20);
        satellite1 = new SpaceAnimation.Satellite((double) width * 3 / 4, (double) height / 2, 5, 1.5);
        satellite2 = new SpaceAnimation.Satellite((double) width * 3 / 4, (double) height / 2, 5, 2.0);
    }

    public void updateAnimation() {
        var newWidth = getWidth();
        var newHeight = getHeight();
        initializeObjects();
        time += 0.05;
        earth.update(newWidth, newHeight, time);
        satellite1.update(newWidth, newHeight, time);
        satellite2.update(newWidth, newHeight, time);
    }

    static class SpaceAnimation {
        static class CelestialBody {
            protected double x, y, radius;
            protected Color color;

            public CelestialBody(double x, double y, double radius) {
                this.x = x;
                this.y = y;
                this.radius = radius;
                this.color = Color.WHITE;
            }

            public void draw(Graphics2D g2d) {
                g2d.setColor(color);
                g2d.fill(new Ellipse2D.Double(x - radius, y - radius, 2 * radius, 2 * radius));
            }
        }

        static class Sun extends CelestialBody {
            public Sun(double x, double y, double radius) {
                super(x, y, radius);
                this.color = Color.YELLOW;
            }
        }

        static class Earth extends CelestialBody {
            private double orbitRadius = 200;
            private double angularSpeed = 0.5;

            public Earth(double centerX, double centerY, double radius) {
                super(centerX, centerY, radius);
                this.color = Color.BLUE;
            }

            public void update(double width, double height, double time) {
                x = (double) width / 2 + orbitRadius * Math.cos(angularSpeed * time);
                y = (double) height / 2 + orbitRadius * Math.sin(angularSpeed * time);

                // Color variation based on position
                float hue = (float) ((Math.sin(angularSpeed * time) + 1) / 2);
                color = Color.getHSBColor(hue, 1.0f, 1.0f);

                // Radius variation based on position
                radius = 20 + 5 * Math.sin(angularSpeed * time);
            }
        }

        static class Satellite extends CelestialBody {
            private double orbitRadius = 50;
            private double angularSpeed;
            private double earthAngle;

            public Satellite(double centerX, double centerY, double radius, double speed) {
                super(centerX, centerY, radius);
                this.angularSpeed = speed;
                this.color = Color.RED;
            }

            public void update(double width, double height, double time) {
                earthAngle = 0.5 * time;
                double satelliteAngle = angularSpeed * time;

                // Elliptical orbit
                double a = orbitRadius;
                double b = orbitRadius * 0.6;
                double satelliteX = a * Math.cos(satelliteAngle);
                double satelliteY = b * Math.sin(satelliteAngle);

                // Rotate around Earth's position
                double earthX = width / 2 + 200 * Math.cos(earthAngle);
                double earthY = height / 2 + 200 * Math.sin(earthAngle);

                x = earthX + satelliteX * Math.cos(earthAngle) - satelliteY * Math.sin(earthAngle);
                y = earthY + satelliteX * Math.sin(earthAngle) + satelliteY * Math.cos(earthAngle);

                // Color variation based on position
                float hue = (float) ((Math.sin(satelliteAngle) + 1) / 2);
                color = Color.getHSBColor(hue, 1.0f, 1.0f);

                // Radius variation based on position
                radius = 5 + 2 * Math.sin(satelliteAngle);
            }
        }
    }
}