Java - Create Dark Night Sky Animation

How to Create a Night Sky Animation with Stars and a Moon In Java Netbeans



In this Java Tutorial we will see How To Create a simple animated scene with stars moving across a dark night sky and a moon shining brightly. 
The animation gives the impression of a serene night with stars twinkling and a calm moon in the background.

What We Are Gonna Use In This Project:

- Java Programming Language.
- NetBeans Editor.





Project Source Code:



package new_tutorials;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 *
 * @author 1BestCsharp
 */
public class DarkNightSky extends JPanel{

    private static final int FRAME_WIDTH = 800;
    private static final int FRAME_HEIGHT = 600;
    private static final int NUM_STARS = 100;
    private static final int STAR_SIZE = 5;
    private static final int ANIMATION_DELAY = 50;
    
    private final List<Point> stars;  // List to store the positions of stars
    private final Moon moon;
    
    public DarkNightSky()
    {
       stars = new ArrayList<>();  // Initialize the list of stars
       generateStars();
       moon = new Moon();
       
       Timer timer = new Timer(ANIMATION_DELAY, (e) -> {
           
           moveStars();
           repaint();
           
       });
       
       timer.start();
    }
    
    
    // Generate random star positions within the panel bounds
    private void generateStars(){
        Random rand = new Random();
        for(int i = 0; i < NUM_STARS; i++){
            int x = rand.nextInt(FRAME_WIDTH);
            int y = rand.nextInt(FRAME_HEIGHT);
            stars.add(new Point(x, y));
        }
    }
    
    
    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.setColor(Color.BLACK);
        // Fill the panel with a black background
        g.fillRect(0, 0, FRAME_WIDTH, FRAME_HEIGHT);
        g.setColor(Color.WHITE);
        
        // Draw stars as rectangles
        for(Point star : stars){
            g.fillRect(star.x, star.y, STAR_SIZE, STAR_SIZE);
        }
        
        // Draw the moon using the Moon class
        moon.draw(g);
        
    }
    
    
    public static void main(String[] args) {
        
        JFrame frame = new JFrame("Dark Night Sky");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        frame.add(new DarkNightSky());
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    
    
    // Move stars in the animation, wrap around when reaching panel bounds
    private void moveStars(){
        
        for(Point star : stars){
            
            star.translate(1, 1);
            
            if(star.x > FRAME_WIDTH)
            {
                star.x = 0;
            }
            
            if(star.y > FRAME_HEIGHT)
            {
                star.y = 0;
            }
        }
        
    }
    
}

// Moon class to draw a white circle representing the moon
class Moon{
    
    private static final int MOON_RADIUS = 100;
    private static final int MOON_X = 600;
    private static final int MOON_Y = 100;
    
    // Draw the moon
    public void draw(Graphics g){
        g.setColor(Color.WHITE);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.fillOval(MOON_X, MOON_Y, MOON_RADIUS, MOON_RADIUS);
    }
    
    
}


The Final Result:








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