C#實現圖形介面的時鐘

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;
 
namespace Cool_Graphics
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        Point center;
 
        private void Form1_Load(object sender, EventArgs e)
        {
            lastFormSize = this.Size;
            initPicBox();
            timer1.Interval = welcomeTime / welcomeSplits;
            timer1.Enabled = true;
        }
 
        private void initPicBox()
        {
            //清空面板，找中心點
            center = new Point(pictureBox1.Width / 2, pictureBox1.Height / 2);
            pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            Graphics g = Graphics.FromImage(pictureBox1.Image);
            g.FillRectangle(Brushes.White, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
 
            //按視窗大小，自動設定錶盤適宜半徑
            r = pictureBox1.Width < pictureBox1.Height ? (pictureBox1.Width / 2 - margin) : (pictureBox1.Height / 2 - margin);
            //預設相對r比例設定 其他值
            circle_width = GetRelativeValue(r, 100);
            pFlag1_length = GetRelativeValue(r, 25);
            pFlag1_width = GetRelativeValue(r, 80);
            pFlag2_length = GetRelativeValue(r, 50);
            pFlag2_width = GetRelativeValue(r, 250);
            second_length = GetRelativeValue(r, 1.15);
            second_tailLen = GetRelativeValue(r, 5);
            second_width = GetRelativeValue(r, 250);
            minute_length = GetRelativeValue(r, 250.0 / 190.0);//分針長度
            minute_width = GetRelativeValue(r, 250.0 / 2.0);//分針寬度
            hour_length = GetRelativeValue(r, 250.0 / 160.0);//時針長度
            hour_width = GetRelativeValue(r, 250.0 / 3.0);//時針寬度
            center_r = GetRelativeValue(r, 250.0 / 4.0);//錶盤中心點半徑
        }
 
        int shanxinNum = 0;
        private void timer1_Tick(object sender, EventArgs e)
        {
            Graphics g = Graphics.FromImage(pictureBox1.Image);
            g.FillPie(new SolidBrush(Color.FromArgb(shanxinNum + 90, shanxinNum * 2 + 10, shanxinNum * 3 + 50)), center.X - r, center.Y - r, r * 2, r * 2, shanxinNum * 360 / welcomeSplits, 360 / welcomeSplits);
 
            if (shanxinNum++ > welcomeSplits / 2)
            {
                timer2.Interval = 1000;
                timer2.Enabled = true;
            }
            if (shanxinNum > welcomeSplits - 1)
            {
                shanxinNum = 0;
                timer1.Enabled = false;
            }
 
            pictureBox1.Refresh();
        }
 
        int welcomeTime = 1000;//歡迎介面時間 ms
        int welcomeSplits = 60;//歡迎介面的切割個數
        int margin = 10;//錶盤外邊距 
        int r = 250;//錶盤半徑
        Color bg_color = Color.White;//背景色
        Color circle_bg_color = Color.LightBlue;//圓盤背景色
 
        float circle_width = 2;//外表盤圓寬度
        Color circle_color = Color.Black;//外表盤圓顏色
        float pFlag1_length = 10;//圓盤外部格標誌1長度
        float pFlag1_width = 3;//圓盤外部格標誌1寬度
        Color pFlag1_color = Color.Black;//圓盤外部格標誌1顏色
        float pFlag2_length = 5;//圓盤外部格標誌2長度
        float pFlag2_width = 1; //圓盤外部格標誌2寬度
        Color pFlag2_color = Color.Black;//圓盤外部格標誌2顏色
        float pSLine_length = 20;//下吊墜線長度
        float pSLine_width = 1;//下吊墜線長度
        Color pSLine_color = Color.Red;//下吊墜線長度
 
        float second_length = 200;//秒針長度
        float second_tailLen = 50;//秒針尾巴長度
        float second_width = 1;//秒針寬度
        Color second_color = Color.Red;//秒針顏色
        float minute_length = 190;//分針長度
        float minute_width = 2;//分針寬度
        Color minute_color = Color.DarkGreen;//分針顏色
        float hour_length = 160;//時針長度
        float hour_width = 3;//時針寬度
        Color hour_color = Color.DarkBlue;//時針顏色
        float center_r = 4;//錶盤中心點半徑
        Color center_color = Color.Black;//圓心點顏色
 
        private void timer2_Tick(object sender, EventArgs e)
        {
            //Console.WriteLine(DateTime.Now.Millisecond);
            // timer2.Enabled = false;
            Graphics g = Graphics.FromImage(pictureBox1.Image);
 
            //面板清空
            g.FillRectangle(new SolidBrush(bg_color), new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
 
            //畫圓盤背景
            g.FillEllipse(new SolidBrush(circle_bg_color), center.X - r, center.Y - r, r * 2, r * 2);
 
            //畫表盤外框圓
            g.DrawEllipse(new Pen(circle_color, circle_width), center.X - r, center.Y - r, r * 2, r * 2);
 
            //話錶盤格
            double span = Math.PI / 30;//每個格子間隔弧度值
            for (float i = 0; i < 60; i++)
            {
                PointF p1 = new PointF(center.X + r * (float)Math.Sin(i * span), center.Y - r * (float)Math.Cos(i * span));
                PointF p2;
                PointF ps2;
                if (i % 5 == 0)
                {
                    p2 = new PointF(center.X + (r - pFlag1_length) * (float)Math.Sin(i * span), center.Y - (r - pFlag1_length) * (float)Math.Cos(i * span));
                    g.DrawLine(new Pen(pFlag1_color, pFlag1_width), p1, p2);
                    /* ps2 = new PointF(p1.X,p1.Y+pSLine_length);
                     g.DrawLine(new Pen(pSLine_color, pSLine_width), p1, ps2);*/
                }
                else
                {
                    p2 = new PointF(center.X + (r - pFlag2_length) * (float)Math.Sin(i * span), center.Y - (r - pFlag2_length) * (float)Math.Cos(i * span));
                    g.DrawLine(new Pen(pFlag2_color, pFlag2_width), p1, p2);
                }
            }
 
            //獲取當前時間
            DateTime time = DateTime.Now;
            float millisecond = (float)time.Millisecond;
            float second = time.Second + millisecond / 1000;
            float minute = time.Minute + second / 60;
            float hour = time.Hour + minute / 60;
            PointF tempPF;
 
            //畫時針
            tempPF = new PointF(center.X + hour_length * (float)Math.Sin(hour * 5 * span), center.Y - hour_length * (float)Math.Cos(hour * 5 * span));
            g.DrawLine(new Pen(hour_color, hour_width), center, tempPF);
 
            //畫分針
            tempPF = new PointF(center.X + minute_length * (float)Math.Sin(minute * span), center.Y - minute_length * (float)Math.Cos(minute * span));
            g.DrawLine(new Pen(minute_color, minute_width), center, tempPF);
 
            //畫秒針
            if (timer2.Interval == 1000)
            {
                second = time.Second;
            }
            tempPF = new PointF(center.X + second_length * (float)Math.Sin(second * span), center.Y - second_length * (float)Math.Cos(second * span));
            PointF tailP = new PointF(center.X - second_tailLen * (float)Math.Sin(second * span), center.Y + second_tailLen * (float)Math.Cos(second * span));
            g.DrawLine(new Pen(second_color, second_width), tailP, tempPF);
 
            畫秒針附加效果
            //for (int i = 1; i < 256; i++)
            //{
            //    tempPF = new PointF(center.X + second_length * (float)Math.Sin((second - i * 0.02) * span), center.Y - second_length * (float)Math.Cos((second - i * 0.02) * span));
            //    tailP = new PointF(center.X - second_tailLen * (float)Math.Sin((second - i * 0.02) * span), center.Y + second_tailLen * (float)Math.Cos((second - i * 0.02) * span));
            //    g.DrawLine(new Pen(Color.FromArgb(255,i,i), second_width), tailP, tempPF);
            //}
 
            畫毫秒針
            //tempPF = new PointF(center.X + second_length * (float)Math.Sin(millisecond * span * 60 / 1000), center.Y - second_length * (float)Math.Cos(millisecond * span * 60 / 1000));
            //tailP = new PointF(center.X - second_tailLen * (float)Math.Sin(millisecond * span * 60 / 1000), center.Y + second_tailLen * (float)Math.Cos(millisecond * span * 60 / 1000));
            //g.DrawLine(new Pen(second_color, second_width), tailP, tempPF);
 
            //畫中心點
            g.FillEllipse(new SolidBrush(center_color), center.X - center_r, center.Y - center_r, center_r * 2, center_r * 2);
 
            pictureBox1.Refresh();
            //timer2.Enabled = true;
        }
 
        private float GetRelativeValue(float src, double ratio)
        {
            return src / (float)ratio > 1 ? src / (float)ratio : 1;
        }
 
        Size lastFormSize;
        private void Form1_ResizeEnd(object sender, EventArgs e)
        {
            if (this.Size == lastFormSize)
                return;
            timer2.Enabled = false;
            shanxinNum = 0;
            initPicBox();
            timer1.Interval = 17;
            timer1.Enabled = true;
        }
 
        FormWindowState lastState = FormWindowState.Normal;
        private void Form1_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState != lastState)
            {
                lastState = this.WindowState;
                timer2.Enabled = false;
                shanxinNum = 0;
                initPicBox();
                timer1.Interval = 17;
                timer1.Enabled = true;
            }
        }
    }
}