C# GDI+ 时钟表盘

一、设计如下图界面

按键“打开时钟”按下后会出现表盘，按键“退出”按下后会关闭页面。

二、时钟函数

给定表盘圆心坐标和半径，初始化一些画笔颜色和画刷大小以及一些变量，通过半径和圆心计算表盘上各点的坐标，读取并记录电脑上的时间戳，计算时针分针秒针的角度，通过之前计算结果绘制表盘。

        每隔一秒（检测读取到的时、分、秒发生变化）擦除一遍页面，重新计算坐标点，重新绘制新的表盘。
 

x7uuu_ 0:06:06
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        
        public Form1()
        {
            InitializeComponent();
            generateBtn();
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        void generateBtn()
        {
            Button bt1 = button1;
            bt1.Text = "打开时钟";
            Button bt2 = button2;
            bt2.Text = "退出";

            /2.Click += new EventHandler( button2_Click);
            //this.Controls.Add(bt2);
        }

        private void button1_Click(object sender, EventArgs e)

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{
            ThreadStart thStart = new ThreadStart(Start);
            Thread thread = new Thread(thStart);
            thread.Priority = ThreadPriority.Highest;
            thread.IsBackground = true; //关闭窗体继续执行
            thread.Start();

        }

        private void Start()
        {

            var graph = this.pictureBox1.CreateGraphics();

            double[] Sin = new double[60];
            double[] Cos = new double[60];
            float[] x = new float[60];
            float[] y = new float[60];
            float[] x1 = new float[60];
            float[] y1 = new float[60];
            float[] x2 = new float[60];
            float[] y2 = new float[60];
            float[] x3 = new float[60];
            float[] y3 = new float[60];
            float[] x4 = new float[60];
            float[] y4 = new float[60];
            float x5 =0;
            float y5 =0;
            float r0 = 0;


            string tradeTime = DateTime.Now.ToString("hhmmss", System.Globalization.DateTimeFormatInfo.InvariantInfo);
            var pencoler1 = new Pen(Color.Red);
            var pencoler2 = new Pen(Color.Yellow);
            var pencoler3 = new Pen(Color.Black);
            var pensize = new Pen(Color.Black, 3);
            var pensize1 = new Pen(Color.Red, 2);
            var pensize2 = new Pen(Color.Black, 4);

            int i;
            int z = 0;
            int x0 = 500;
            int y0 = 300;
            int r = 300;
            int sec, min, hour;
            int secn = 0, minn = 0, hourn = 0;
            int Time;

            for (i = 0; i < 60; i++)

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 {
                //if (i == 0 || i == 30 || i == 15 || i == 45) {  continue; }
                double d = (((i * 6) - 90) * 3.1415) / 180;
                Sin[i] = Math.Sin(d);
                Cos[i] = Math.Cos(d);
                y[i] = (float)(Sin[i] * r) + y0;
                x[i] = (float)(Cos[i] * r) + x0;
                x1[i] = x[i] - (x[i] - x0) / 10;
                y1[i] = y[i] - (y[i] - y0) / 10;
                x2[i] = x[i] - (x[i] - x0) / 7 - r / 20;
                y2[i] = y[i] - (y[i] - y0) / 7 - r / 20;
                x3[i] = x[i] - (x[i] - x0) / 20;
                y3[i] = y[i] - (y[i] - y0) / 20;
                x4[i] = x[i] - (x[i] - x0) / 2;
                y4[i] = y[i] - (y[i] - y0) / 2;
                x5 = x0 - r / 40;
                y5 = y0 - r / 40;
                r0 = r / 20;

            }

            Brush penbrush = new SolidBrush(Color.Black);
            Font penfont = new Font("华文行楷", r / 20);
            
            for (; ; )
            {
                tradeTime = DateTime.Now.ToString("hhmmss", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                Time = int.Parse(tradeTime);
                sec = Time % 100;
                min = Time / 100 % 100;
                hour = Time / 10000;
                if (hour == 12) { hour = 0; }

                if (secn != sec || minn != min || hourn != hour)
                {
                    //MessageBox.Show(sec.ToString());
                    graph.Clear(this.BackColor);
                    //graph.DrawEllipse(pencoler2, x0 - r, y0 - r, 2*r, 2*r);

                    for (i = 0; i < 60; i++)
                    {
                        if (i % 5 == 0)
                        {
                            z = i / 5;
                            if (z == 0) z = 12;
                            graph.DrawLine(pensize, x[i], y[i],x1[i],y1[i]);
                            graph.DrawString(z.ToString(), penfont, penbrush, x2[i], y2[i]);
                        }
                        else
                        {
                            graph.DrawLine(pencoler3, x[i], y[i], x3[i], y3[i]);
                        }
                    }
                    graph.DrawLine(pensize1, x0, y0, x[sec], y[sec]);
                    graph.DrawLine(pensize2, x0, y0, x[min], y[min]);
                    graph.DrawLine(pensize2, x0, y0, x4[hour*5], y4[hour*5]);
                    //graph.DrawPie(pencoler2, x0-r, y0-r, 2*r, 2*r, sec * 6-90, 1);
                    //graph.DrawPie(pencoler3, x0-r , y0-r , r*2, r*2, min * 6-90, 1);
                    //graph.DrawPie(pencoler3, x0-r/2 , y0-r/2 , r, r, hour*30-90, 2);

                    secn = sec;
                    minn = min;
                    hourn = hour;
                    graph.FillEllipse(new SolidBrush(Color.Yellow), x5 , y5 , r0, r0);
                    continue;
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        
    }

}