C#实现时钟控件

十年前在东北学绘图无聊做完雪花屏保之后，又做了个时钟控件，然后用这个控件做了个时钟屏保。学会了绘图之后就可以自己做用户控件了。C#winform的用户控件只要继承UserControl类即可。

源码地址

时钟屏保源码

先拖一个用户控件UserControl，然后自己实现绘图和属性就可以自定义控件。

就是在定时器逻辑里按属性绘制时钟表盘

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

namespace UserClock
{
    public class UserClock:UserControl
    {
        private DateTime time;
        private Timer timer1;
        private System.ComponentModel.IContainer components;
        public UserClock()
        {
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Interval = 1000;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // UserClock
            // 
            this.Name = "UserClock";
            this.ResumeLayout(false);

        }

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

        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics pDC = e.Graphics;
            Pen pen = new Pen(this.ForeColor);
            SolidBrush brush = new SolidBrush(this.ForeColor);
            InitCoordinates(pDC);
            DrawDots(pDC, brush);
            DrawHourHand(pDC, pen);
            DrawMineteHand(pDC, pen);
            DrawSecondHand(pDC, pen);
            
        }

        protected   void InitCoordinates(Graphics pDC)
        {
            if (this.Width == 0 || this.Height == 0)
            {
                return;
            }
            pDC.TranslateTransform(this.Width/2,this.Height/2);//平移坐标原点
            pDC.ScaleTransform(this.Height / 250F, this.Width / 250F);//调整比例大小
        }
        protected   void DrawDots(Graphics pDC, Brush brush)
        {
            int size;
            for (int i = 0; i <= 59; i++)
            {
                if (i % 5 == 0)
                {
                    size = 15;
                }
                else
                {
                    size = 5;
                }
                pDC.FillEllipse(brush,-size /2,-100-size /2,size ,size );
                pDC.RotateTransform(6);
            }
        }

        protected  void DrawHourHand(Graphics pDC,Pen pen)
        {
            GraphicsState state = pDC.Save();
            pDC.RotateTransform(360.0F * time.Hour / 12 + 30F * time.Minute / 60);
            pDC.DrawLine(pen, 0, 0, 0, -50);
            pDC.Restore(state);
        }


        protected  void DrawMineteHand(Graphics pDC, Pen pen)
        {
            GraphicsState state = pDC.Save();
            pDC.RotateTransform(360.0F * time.Minute / 60 + 6.0F * time.Second / 60);
            pDC.DrawLine(pen, 0, 0, 0, -70);
            pDC.Restore(state);
        }

        protected  void DrawSecondHand(Graphics pDC, Pen pen)
        {
            GraphicsState state = pDC.Save();
            pDC.RotateTransform(360.0F * time.Second  / 60);
            pDC.DrawLine(pen, 0, 0, 0, -100);
            pDC.Restore(state);
        }

    }
}

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这样简单的代码就可以实现炫酷的小东西，增加编码自信