C#编写的clock

using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;namespace MyClockApp
 {
     public partial class Clock : Form
     {
         public Clock()
         {
             InitializeComponent();
         }        /// <summary>
         /// 得到当前系统时间，并将其拼接成一个字符串
         /// </summary>
         /// <returns>数字时钟要显示的字符串</returns>
         public string GetTime() 
         {
             String TimeInString = "";
             int hour = DateTime.Now.Hour;
             int min = DateTime.Now.Minute;
             int sec = DateTime.Now.Second;
             //将时，分，秒连成一个字符串
             TimeInString = (hour < 10) ? "0" + hour.ToString() : hour.ToString();
             TimeInString += ":" + ((min < 10) ? "0" + min.ToString() : min.ToString());
             TimeInString += ":" + ((sec < 10) ? "0" + sec.ToString() : sec.ToString());
             
             return TimeInString;
         }
         /// <summary>
         /// 在窗体上画表盘时钟的图形
         /// </summary>
         /// <param name="h"></param>
         /// <param name="m"></param>
         /// <param name="s"></param>
         private void MyDrawClock(int h, int m, int s)
         { 
             Graphics g = this.CreateGraphics();
             Rectangle rect = this.ClientRectangle;            g.Clear(Color.White);
            Pen myPen = new Pen(Color.Black, 1);
             g.DrawEllipse(myPen, this.ClientRectangle.Width / 2 - 75, this.ClientRectangle.Height / 2-75, 150, 150);//画表盘            Point centerPoint = new Point(this.ClientRectangle.Width / 2, this.ClientRectangle.Height / 2);//表的中心点
             //计算出秒针，时针，分针的另外一个商点
             Point secPoint = new Point((int)(centerPoint.X + (Math.Sin(s * Math.PI / 30) * 50)), (int)(centerPoint.Y - (Math.Cos(s * Math.PI / 30) * 50)));
             Point minPoint = new Point((int)(centerPoint.X + (Math.Sin(m * Math.PI / 30) * 40)), (int)(centerPoint.Y - (Math.Cos(m * Math.PI / 30) * 40)));
             Point hourPoint = new Point((int)(centerPoint.X + (Math.Sin(h * Math.PI / 6) * 30) - m * Math.PI / 360), (int)(centerPoint.Y - (Math.Cos(h * Math.PI / 6) * 30) - m * Math.PI / 360));
             
             //以不同颜色和宽度绘制表针
             myPen = new Pen(Color.Red, 1);
             g.DrawLine(myPen, centerPoint, secPoint);
             myPen = new Pen(Color.Green, 2);
             g.DrawLine(myPen, centerPoint, minPoint);
             myPen = new Pen(Color.Orange, 4);
             g.DrawLine(myPen, centerPoint, hourPoint);
         }
         /// <summary>
         /// 定时刷新显示时间
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void timer1_Tick(object sender, EventArgs e)
         {
             int h = DateTime.Now.Hour;
             int s = DateTime.Now.Second;
             int m = DateTime.Now.Minute;            MyDrawClock(h, m, s);
             toolStripStatusLabel1.Text = string.Format("{0}:{1}:{2}", h, m, s);
             lblTime.Text = GetTime();
         }
         /// <summary>
         /// 若无此方法，时钟也能显示，但要等窗体显示几秒以后表盘才会显示。有了此方法窗体和表盘同时显示
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void Form1_Paint(object sender, PaintEventArgs e)
         {
             int h = DateTime.Now.Hour;
             int s = DateTime.Now.Second;
             int m = DateTime.Now.Minute;            MyDrawClock(h, m, s);
             toolStripStatusLabel1.Text = string.Format("{0}:{1}:{2}", h, m, s);
             lblTime.Text = GetTime();
         }     }
 }