C#钟表控件

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

namespace WindowsTime
{
    public partial class TimeCustomControl : Control
    {
        public TimeCustomControl()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.AllPaintingInWmPaint, true);
        }

        public DateTime Time;

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.Time = DateTime.Now;
            this.Refresh();
        }

        private void TimeCustomControl_Paint(object sender, PaintEventArgs e)
        {
            Graphics dc = e.Graphics;
            Pen pn = new Pen(ForeColor);
            SolidBrush br = new SolidBrush(ForeColor);
            InitCoordinates(dc);
            DrawDots(dc,br);
            DrawHourHand(dc,pn);
            DrawSecondHand(dc, pn);
            DrawMinuteHand(dc, pn);
        }

        public void InitCoordinates(Graphics dc)
        {
            if (this.Width == 0 || this.Height==0)
            {
                return;
            }
            dc.TranslateTransform(this.Width / 2, this.Height / 2);
            dc.ScaleTransform(this.Height/250f,this.Width/250f);
        }

        public void DrawDots(Graphics dc,Brush brush)
        {
            int iSize;
            for (int i = 0; i <=59; i++)
            {
                if (i % 5 ==0)
                {
                    iSize = 15;
                }
                else
                {
                    iSize = 5;
                }
                dc.FillEllipse(brush, -iSize / 2, -100 - iSize / 2, iSize, iSize);
                dc.RotateTransform(6);
            }
        }

        protected virtual void DrawHourHand(Graphics grfx, Pen pn)
        {
            GraphicsState gs = grfx.Save();
            grfx.RotateTransform(360.0F * Time.Hour/12 +30.0F * Time.Minute / 60);
            grfx.DrawLine(pn, 0, 0, 0, -50);
            grfx.Restore(gs);
        }

        protected virtual void DrawMinuteHand(Graphics grfx, Pen pn)
        {
            GraphicsState gs = grfx.Save();
            grfx.RotateTransform(360.0F * Time.Minute/60 + 6.0F * Time.Second/60);
            grfx.DrawLine(pn, 0, 0, 0, -70);
            grfx.Restore(gs);
        }

        protected virtual void DrawSecondHand(Graphics grfx, Pen pn)
        {
            GraphicsState gs = grfx.Save();
            grfx.RotateTransform(360.0F * Time.Second/60);
            grfx.DrawLine(pn, 0, 0, 0, -100);
            grfx.Restore(gs);
        }
    }
}