时钟表盘代码

package timer.com.cn;

import javax.swing.*; //时钟
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Calendar;
import java.util.GregorianCalendar;

class Clock extends JFrame implements ActionListener {
 int x, y, x0, y0, r, h, olds_x, olds_y, oldm_x, oldm_y, oldh_x, oldh_y, ss,
   mm, hh, old_m, old_h, ang;
 final double RAD = Math.PI / 180; // 度数转换成弧度的比例
 // 构造函数创建了一个窗体
 public Clock() {
  super("时钟"); // 设置标题
  setSize(250, 250); // 设置窗口尺寸
  setBackground(Color.WHITE); // 设置背景颜色
  setLocation(300, 150); // 设置窗口位置坐标
  setResizable(false); // 使窗口可以最小化和关闭，但是不能任意改变大小
  setVisible(true); // 设置组建可见
  int delay = 100; // 设置延时
  // 创建一个监听事件
  ActionListener drawClock = new ActionListener() {
   public void actionPerformed(ActionEvent evt) {
    repaint();
   }
  };

  new Timer(delay, drawClock).start(); // 创建时间计数器，每秒触发一次
 }

 public void actionPerformed(ActionEvent e) {// 实现ActionListener接口必须实现的方法}

 } // 绘制图形
 public void paint(Graphics g) {
  Graphics2D g2D = (Graphics2D) g;
  Insets insets = getInsets();
  int L = insets.left / 2, T = insets.top / 2;
  h = getSize().height;
  g.setColor(Color.black);

  // 画圆
  g2D.setStroke(new BasicStroke(4.0f));
  g.drawOval(L + 40, T + 40, h - 80, h - 80);
  r = h / 2 - 40;
  x0 = 40 + r - 5 + L;
  y0 = 40 + r - 5 - T;
  ang = 60;

  // 绘制时钟上的12个数字
  for (int i = 1; i <= 12; i++) {
   x = (int) ((r - 9) * Math.cos(RAD * ang) + x0);
   y = (int) ((r - 9) * Math.sin(RAD * ang) + y0);
   g.drawString("" + i, x, h - y);
   ang -= 30;
  }

  // 获得当前系统时间
  Calendar now = new GregorianCalendar();
  int nowh = now.get(Calendar.HOUR_OF_DAY);
  int nowm = now.get(Calendar.MINUTE);
  int nows = now.get(Calendar.SECOND);
  String st;
  if (nowh < 10)
   st = "0" + nowh;
  else
   st = "" + nowh;
  if (nowm < 10)
   st += ":0" + nowm;
  else
   st += ":" + nowm;
  if (nows < 10)
   st += ":0" + nows;
  else
   st += ":" + nows;

  // 在窗体上显示时间
  g.setColor(Color.white);//
  g.fillRect(L, T, 50, 28);//
  g.setColor(Color.black);//
  g.drawString(st, L + 2, T + 26);//

  // 计算时间与度数的关系
  ss = 90 - nows * 6;
  mm = 90 - nowm * 6;
  hh = 90 - nowh * 30 - nowm / 2;
  x0 = r + 40 + L;
  y0 = r + 40 + T;

  g2D.setStroke(new BasicStroke(1.0f));// 秒针粗细
  // 擦除秒针
  if (olds_x > 0) {
   g.setColor(getBackground());
   g.drawLine(x0, y0, olds_x, h - olds_y);
  } else {
   old_m = mm;
   old_h = hh;
  }
  // 绘制秒针
  x = (int) (r * 0.9 * Math.cos(RAD * ss)) + x0;// 长度
  y = (int) (r * 0.9 * Math.sin(RAD * ss)) + y0 - 2 * T;
  g.setColor(Color.black);// 指针颜色
  g.drawLine(x0, y0, x, h - y);// 轨迹
  olds_x = x;
  olds_y = y;

  g2D.setStroke(new BasicStroke(2.2f));// 分针粗细
  // 擦除分针
  if (old_m != mm) {
   g.setColor(getBackground());
   g.drawLine(x0, y0, oldm_x, h - oldm_y);
  }
  // 绘制分针
  x = (int) (r * 0.7 * Math.cos(RAD * mm)) + x0;// 长度
  y = (int) (r * 0.7 * Math.sin(RAD * mm)) + y0 - 2 * T;
  g.setColor(Color.red);// 颜色
  g.drawLine(x0, y0, x, h - y);
  oldm_x = x;
  oldm_y = y;
  old_m = mm;

  g2D.setStroke(new BasicStroke(3.4f));// 时针粗细
  // 擦除时针
  if (old_h != hh) {
   g.setColor(getBackground());
   g.drawLine(x0, y0, oldh_x, h - oldh_y);
  }
  // 绘制时针
  x = (int) (r * 0.5 * Math.cos(RAD * hh)) + x0;// 长度
  y = (int) (r * 0.5 * Math.sin(RAD * hh)) + y0 - 2 * T;
  g.setColor(Color.red);// 颜色
  g.drawLine(x0, y0, x, h - y);
  oldh_x = x;
  oldh_y = y;
  old_h = hh;
 }

 public static void main(String[] args) {
  Clock c = new Clock();
 }
}