程序代码：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace test2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
            pictureBox1.Refresh();
            pset(e);
            clock(Color.Khaki, 50, 4, DateTime.Now.Hour, 30, e);
            clock(Color.Green, 70, 3, DateTime.Now.Minute, 6, e);
            clock(Color.Red, 100, 1, DateTime.Now.Second, 6, e);
            
        }

        private void pset(PaintEventArgs e)
        {
            int c = 100;
            int a = 0;
            int b = 0;
            int clockNum = 0;
            string[] num = new string[] {"12","1","2","3","4","5","6","7","8","9","10","11" };
            for (int i = 0; i < 360; i+=30)
            {
                a = (int)(c * Math.Cos(Math.PI * i / 180));
                b = (int)(Math.Sin(Math.PI * i / 180) * c);
                
                e.Graphics.DrawString(num[clockNum], this.Font, Brushes.Black, 200 + b - 9, 200 - a - 10);
                e.Graphics.DrawString(num[clockNum], this.Font, Brushes.Blue, 200 + b - 12, 200 - a - 12);
                clockNum++;
            }
        }

        private void clock(Color color, int r,  int width, int dt, int value, PaintEventArgs e)
        {
            Pen pen = new Pen(color, width);
            int c = r;
            int a = 0;
            int b = 0;
            a = (int)(c * Math.Cos(Math.PI * dt * value / 180));
            b = (int)(c * Math.Sin(Math.PI * dt * value / 180));
            e.Graphics.DrawLine(pen, new Point(200, 200), new Point(200 + b, 200 - a));
        }
    }
}

时钟.rar (19.9 KB)