package cc.mrbird.febs.websocket;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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import javax.swing.Timer;
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public class Ball extends JPanel implements ActionListener {
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private Timer timer;
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private int x, y;
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private int size;
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public Ball() {
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x = 0;
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y = 0;
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size = 20;
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timer = new Timer(10, this);
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timer.start();
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}
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// 重写paintComponent方法，绘制红色的球
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@Override
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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Graphics2D g2d = (Graphics2D) g;
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// 开启抗锯齿
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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// 设置颜色为红色
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g2d.setColor(Color.RED);
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// 绘制圆形
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g2d.fillOval(x, y, size, size);
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}
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// 重写actionPerformed方法，控制球的大小
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@Override
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public void actionPerformed(ActionEvent e) {
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// 如果球的大小小于100，则增加大小
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if (size < 100) {
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size++;
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} else {
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// 否则减小大小
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size--;
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}
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// 重新绘制
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repaint();
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// 控制球的移动
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x++;
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if (x > getWidth()) {
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x = 0;
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}
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}
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public static void main(String[] args) {
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// 创建窗口
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JFrame frame = new JFrame("Ball");
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// 添加球
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frame.add(new Ball());
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// 设置窗口大小
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frame.setSize(300, 300);
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// 显示窗口
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frame.setVisible(true);
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// 设置关闭窗口时的操作
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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}
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}
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