java爱心烟花代码

以下是Java实现爱心烟花的代码：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Fireworks extends JPanel implements Runnable {
    private static final long serialVersionUID = 1L;
    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;
    private static final int FIREWORKS_NUM = 10;
    private static final int FIREWORKS_PARTICLE_NUM = 100;
    private static final int FIREWORKS_PARTICLE_SIZE = 5;
    private static final int FIREWORKS_PARTICLE_SPEED = 10;
    private static final int FIREWORKS_EXPLODE_SPEED = 5;
    private static final int FIREWORKS_EXPLODE_SIZE = 20;
    private static final int FIREWORKS_EXPLODE_PARTICLE_SIZE = 3;
    private static final int FIREWORKS_EXPLODE_PARTICLE_SPEED = 5;    private static final int FIREWORKS_EXPLODE_PARTICLE_NUM = 100;
    private static final int FIREWORKS_EXPLODE_PARTICLE_LIFE = 100;
    private static final int FIREWORKS_EXPLODE_PARTICLE_FADE = 5;
    private static final int FIREWORKS_DELAY = 50;
    private List<Firework> fireworks = new ArrayList<Firework>();

    public Fireworks() {
        setPreferredSize(new java.awt.Dimension(WIDTH, HEIGHT));
        setBackground(Color.BLACK);
        for (int i = 0; i < FIREWORKS_NUM; i++) {
            fireworks.add(new Firework());
        }
    }

    @Override
    public void run() {
        while (true) {
            try {
                Thread.sleep(FIREWORKS_DELAY);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            repaint();
        }
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (Firework firework : fireworks) {
            firework.draw(g);
        }
    }

    private class Firework {
        private Point position;
        private Point velocity;
        private List<Particle> particles = new ArrayList<Particle>();        private boolean exploded = false;

        public Firework() {
            position = new Point((int) (Math.random() * WIDTH), HEIGHT);
            velocity = new Point(0, -(int) (Math.random() * FIREWORKS_PARTICLE_SPEED));
        }

        public void draw(Graphics g) {
            if (!exploded) {
                g.setColor(Color.WHITE);
                g.fillRect(position.x, position.y, FIREWORKS_PARTICLE_SIZE, FIREWORKS_PARTICLE_SIZE);
                move();
                if (velocity.y >= 0) {
                    explode();
                }
            } else {
                for (Particle particle : particles) {
                    particle.draw(g);
                }
            }
        }

        private void move() {
            position.x += velocity.x;
            position.y += velocity.y;
            velocity.y += 1;
        }

        private void explode() {
            exploded = true;
            for (int i = 0; i < FIREWORKS_EXPLODE_PARTICLE_NUM; i++) {
                particles.add(new Particle(position));
            }
        }

        private class Particle {
            private Point position;
            private Point velocity;
            private int life;

            public Particle(Point position) {
                this.position = new Point(position);
                velocity = new Point((int) (Math.random() * FIREWORKS_EXPLODE_PARTICLE_SPEED * 2 - FIREWORKS_EXPLODE_PARTICLE_SPEED),
                        (int) (Math.random() * FIREWORKS_EXPLODE_PARTICLE_SPEED * 2 - FIREWORKS_EXPLODE_PARTICLE_SPEED));
                life = FIREWORKS_EXPLODE_PARTICLE_LIFE;
            }

            public void draw(Graphics g) {
                g.setColor(new Color((int) (Math.random() * 255), (int) (Math.random() * 255), (int) (Math.random() * 255), life));
                g.fillRect(position.x, position.y, FIREWORKS_EXPLODE_PARTICLE_SIZE, FIREWORKS_EXPLODE_PARTICLE_SIZE);
                move();
            }

            private void move() {
                position.x += velocity.x;
                position.y += velocity.y;
                life -= FIREWORKS_EXPLODE_PARTICLE_FADE;
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Fireworks");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Fireworks fireworks = new Fireworks();
        frame.getContentPane().add(fireworks);
        frame.pack();
        frame.setVisible(true);
        new Thread(fireworks).start();
    }
}