java流星雨特效代码

以下是一个简单的 Java 流星雨特效代码：

import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MeteorShower 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 NUM_METEORS = 20;
    private static final int MAX_METEOR_SIZE = 20;
    private static final int MAX_METEOR_SPEED = 10;
    private static final int MAX_METEOR_TRAIL_LENGTH = 50;
    private static final Color METEOR_COLOR = Color.WHITE;
    private static final Color BACKGROUND_COLOR = Color.BLACK;
    private Meteor[] meteors;

    public MeteorShower() {
        setBackground(BACKGROUND_COLOR);
        meteors = new Meteor[NUM_METEORS];
        Random rand = new Random();
        for (int i = 0; i < NUM_METEORS; i++) {
            int x = rand.nextInt(WIDTH);
            int y = rand.nextInt(HEIGHT);
            int size = rand.nextInt(MAX_METEOR_SIZE) + 1;
            int speed = rand.nextInt(MAX_METEOR_SPEED) + 1;
            int trailLength = rand.nextInt(MAX_METEOR_TRAIL_LENGTH) + 1;
            meteors[i] = new Meteor(x, y, size, speed, trailLength);
        }
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (Meteor meteor : meteors) {
            meteor.draw(g);
        }
    }

    public void run() {
        while (true) {
            for (Meteor meteor : meteors) {
                meteor.update();
            }
            repaint();
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Meteor Shower");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT);
        MeteorShower meteorShower = new MeteorShower();
        frame.add(meteorShower);
        frame.setVisible(true);
        Thread thread = new Thread(meteorShower);
        thread.start();
    }
}

class Meteor {
    private int x;
    private int y;
    private int size;
    private int speed;
    private int trailLength;
    private int[] trailX;
    private int[] trailY;

    public Meteor(int x, int y, int size, int speed, int trailLength) {
        this.x = x;
        this.y = y;
        this.size = size;
        this.speed = speed;
        this.trailLength = trailLength;
        trailX = new int[trailLength];
        trailY = new int[trailLength];
    }

    public void update() {
        for (int i = trailLength - 1; i > 0; i--) {
            trailX[i] = trailX[i - 1];
            trailY[i] = trailY[i - 1];
        }
        trailX[0] = x;
        trailY[0] = y;
        x -= speed;
        y += speed;
        if (x < -size || y > MeteorShower.HEIGHT + size) {
            Random rand = new Random();
            x = MeteorShower.WIDTH + size;
            y = rand.nextInt(MeteorShower.HEIGHT);
            size = rand.nextInt(MeteorShower.MAX_METEOR_SIZE) + 1;
            speed = rand.nextInt(MeteorShower.MAX_METEOR_SPEED) + 1;
            trailLength = rand.nextInt(MeteorShower.MAX_METEOR_TRAIL_LENGTH) + 1;
            trailX = new int[trailLength];
            trailY = new int[trailLength];
        }
    }

    public void draw(Graphics g) {
        g.setColor(MeteorShower.METEOR_COLOR);
        for (int i = 0; i < trailLength - 1; i++) {
            g.drawLine(trailX[i], trailY[i], trailX[i + 1], trailY[i + 1]);
        }
        g.fillOval(x - size / 2, y - size / 2, size, size);
    }
}