eclipse 雪花代码

下面是一个用Java编写的Eclipse雪花代码：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class SnowFlake extends JPanel {
    private final static int WIDTH = 640;
    private final static int HEIGHT = 480;
    private final static int MAX_LENGTH = 100;
    private final static int MIN_LENGTH = 10;

    private final static int MAX_ANGLE = 360;
    private final static int MAX_BRANCHES = 4;

    private static Random random = new Random();

    public static void main(String[] args) {
        JFrame frame = new JFrame("SnowFlake");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);
        frame.getContentPane().add(new SnowFlake());
        frame.setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0, 0, WIDTH, HEIGHT);

        drawSnowFlake(g2d, WIDTH / 2, HEIGHT / 2, MAX_LENGTH, 0);
    }

    private static void drawSnowFlake(Graphics2D g2d, int x, int y, int length, int angle) {
        if (length < MIN_LENGTH) {
            return;
        }

        for (int i = 0; i < MAX_BRANCHES; i++) {
            double branchAngle = angle + i * MAX_ANGLE / MAX_BRANCHES;
            int branchLength = length - random.nextInt(length / 2);
            int endX = x + (int) (branchLength * Math.cos(Math.toRadians(branchAngle)));
            int endY = y + (int) (branchLength * Math.sin(Math.toRadians(branchAngle)));
            g2d.draw(new Line2D.Double(x, y, endX, endY));
            drawSnowFlake(g2d, endX, endY, branchLength, (int) branchAngle);
        }
    }
}

这个程序会在窗口中绘制一个雪花，雪花会随机生成分支并递归绘制。运行程序后，您将看到类似于以下图像的雪花：