用java画一个动画版的圣诞树

以下是一个用Java绘制动画版圣诞树的示例代码：

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

public class ChristmasTreeAnimation extends JPanel implements ActionListener {
    private int treeHeight;
    private int frameCount;
    private Timer timer;

    public ChristmasTreeAnimation(int treeHeight) {
        this.treeHeight = treeHeight;
        this.frameCount = 0;
        this.timer = new Timer(100, this);
        this.timer.start();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;

        // 绘制背景
        g2d.setColor(Color.BLACK);
        g2d.fillRect(0, 0, getWidth(), getHeight());

        // 绘制圣诞树
        drawChristmasTree(g2d, getWidth() / 2, getHeight() - 50, treeHeight, frameCount);

        // 绘制文字
        g2d.setColor(Color.WHITE);
        g2d.setFont(new Font("Arial", Font.BOLD, 20));
        g2d.drawString("Merry Christmas!", getWidth() / 2 - 80, getHeight() - 20);
    }

    private void drawChristmasTree(Graphics2D g2d, int x, int y, int height, int frame) {
        int trunkHeight = height / 5;
        int trunkWidth = height / 10;
        int treeTopHeight = height - trunkHeight;

        // 绘制树冠
        g2d.setColor(new Color(34, 139, 34));
        g2d.fillPolygon(new int[]{x - height / 2, x + height / 2, x}, new int[]{y - treeTopHeight, y - treeTopHeight, y}, 3);

        // 绘制树干
        g2d.setColor(new Color(139, 69, 19));
        g2d.fillRect(x - trunkWidth / 2, y, trunkWidth, trunkHeight);

        // 绘制装饰品
        int ornamentSize = height / 10;
        int ornamentSpacing = height / 8;
        int ornamentY = y - treeTopHeight + ornamentSize / 2;
        int ornamentX = x - height / 2 + ornamentSize / 2;
        for (int i = 0; i < height / ornamentSpacing; i++) {
            for (int j = 0; j < i + 1; j++) {
                if ((frame / 10 + i + j) % 2 == 0) {
                    g2d.setColor(Color.RED);
                } else {
                    g2d.setColor(Color.YELLOW);
                }
                g2d.fillOval(ornamentX + j * ornamentSpacing, ornamentY + i * ornamentSpacing, ornamentSize, ornamentSize);
            }
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        frameCount++;
        repaint();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Christmas Tree Animation");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);
        frame.setLocationRelativeTo(null);

        ChristmasTreeAnimation animation = new ChristmasTreeAnimation(300);
        frame.add(animation);

        frame.setVisible(true);
    }
}

这段代码使用了Java的Swing库来创建一个窗口，并在窗口中绘制动画版的圣诞树。圣诞树的形状由三角形和矩形组成，装饰品使用圆形表示。通过定时器控制每一帧的绘制，使得装饰品呈现动画效果。