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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Timers;
using System.Windows.Forms;

namespace AnalogClock
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        System.Timers.Timer Time = new System.Timers.Timer();
        int intH = 0;
        int Radius = 150, zhizD = 40;//表盘半径(可按照父控件大小来更改),指针到表盘边缘的距离
        int InitialX = 10, InitialY = 10;//表盘的坐标X，Y
        private void Form1_Load(object sender, EventArgs e)
        {        
            //return;
            Time.Enabled = true;
            Time.Interval = 1000; //执行间隔时间,单位为毫秒; 这里实际间隔为1秒种             
            Time.Start();
            Time.Elapsed  = new ElapsedEventHandler(ClockRun);
        }
        private void ClockRun(object source, ElapsedEventArgs e)
        {
            this.Invoke(new EventHandler(delegate
            {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
                Graphics gra = this.picClock.CreateGraphics();
                gra.Clear(this.BackColor);//清除
                gra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
                Pen pen = new Pen(Color.Black);//画笔颜色                                
                gra.DrawEllipse(pen, InitialX, InitialY, Radius * 2, Radius * 2);//表盘
                Brush bush = new SolidBrush(Color.Black);//填充的颜色
                gra.FillEllipse(bush, Radius   InitialX - 4, Radius   InitialY - 4, 8, 8);//表心

                Pen p = new Pen(Color.Black, 3);
                int[] intKdS, intKdE, intKdZ;
                //12个刻度
                for (int i = 0; i < 12; i  )
                {
                    //画刻度
                    intKdS = Trigonometric(i, 6, Radius);//刻度的终点坐标
                    intKdE = Trigonometric(i, 6, Radius - 8);//刻度的起点坐标
                    intKdZ = Trigonometric(i, 6, Radius - 20);
                    gra.DrawLine(p, Radius   InitialX   intKdE[0], Radius   InitialY - intKdE[1], Radius   InitialX   intKdS[0], Radius   InitialY - intKdS[1]);//
                                                                                                                                                                //写刻度上的数字
                    Label lab = new Label();//初始化一个控件
                    lab.Name = "lab"   i;
                    lab.Size = i > 0 && i < 7 ? new Size(8, 12) : new Size(18, 12);//设置大小
                    lab.Location = new Point(Radius   intKdZ[0]   8, Radius - intKdZ[1]   8);//设置坐标
                    lab.Text = i == 0 ? "12" : i.ToString();
                    this.picClock.Controls.Add(lab);
                }

                //用一个int数组存放时分秒针的终点坐标
                labNowTime.Text = "实时时间："   DateTime.Now.ToString();//数字式实时时间日期

                intH = DateTime.Now.Hour; //实时时间的小时             
                intH = intH > 12 ? intH - 12 : intH;// 将24小时制转换成12小时制

                int[] intSecond = Trigonometric(DateTime.Now.Second, 30, Radius - zhizD), intMinute = Trigonometric(DateTime.Now.Minute, 30, Radius - zhizD), intHour = Trigonometric(intH, 6, Radius - zhizD);
                //Graphics gra = this.picClock.CreateGraphics();
                
                //箭头
                AdjustableArrowCap lineCap = new AdjustableArrowCap(4, 4, true);
                //秒针
                Pen redArrowPenS = new Pen(Color.Black, 1);
                redArrowPenS.CustomEndCap = lineCap;
                gra.DrawLine(redArrowPenS, Radius   InitialX, Radius   InitialY, Radius   InitialX   intSecond[0], Radius   InitialY - intSecond[1]);
                //分针
                Pen redArrowPenM = new Pen(Color.Black, 2);
                redArrowPenM.CustomEndCap = lineCap;
                gra.DrawLine(redArrowPenM, Radius   InitialX, Radius   InitialY, Radius   InitialX   intMinute[0], Radius   InitialY - intMinute[1]);
                //时针
                Pen redArrowPenH = new Pen(Color.Black, 3);
                redArrowPenH.CustomEndCap = lineCap;
                gra.DrawLine(redArrowPenH, Radius   InitialX, Radius   InitialY, Radius   InitialX   intHour[0], Radius   InitialY - intHour[1]);

            }));
        }
        /// <summary>
        /// 通过三角函数换算对边和斜边
        /// </summary>
        /// <param name="intPut">夹角倍数</param>
        /// <param name="intPutP"> 单倍夹角角度=Math.PI/intPutP（eg:秒针为6度）</param>
        /// <param name="BC">斜边的长度</param>
        /// <returns></returns>
        private int[] Trigonometric(int intPut, int intPutP, int BC)
        {            
            double J = 0, AB = 0, AC = 0;//夹角，对边，临边
            int[] outPut = new int[2] { 0, 0 };
            J = Math.PI / intPutP * intPut;
            AB = Math.Sin(J) * BC;
            AC = Math.Cos(J) * BC;
            outPut[0] = Convert.ToInt32(AB);
            outPut[1] = Convert.ToInt32(AC);         
            return outPut;
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            Time.Close();
        }
    }
}