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   源码介绍

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c#图形编程

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

        public string GetTime()
        {
            string TimeInString = "";
            //DateTime.Now.Hour返回当前时
            int hour = DateTime.Now.Hour;
            //DateTime.Now.Hour返回当前分
            int min = DateTime.Now.Minute;
            //DateTime.Now.Hour返回当前秒
            int sec = DateTime.Now.Second;
            //将时、分、秒连在一起得到TimeInString
            TimeInString = (hour < 10) ? "0"   hour.ToString() : hour.ToString();
            TimeInString  = ":"   ((min < 10) ? "0"   min.ToString() : min.ToString());
            TimeInString  = ":"   ((sec < 10) ? "0"   sec.ToString() : sec.ToString());
            return TimeInString;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            //得到当前的时、分、秒
            int h = DateTime.Now.Hour;
            int m = DateTime.Now.Minute;
            int s = DateTime.Now.Second;
            //调用MyDrawClock绘制图形表盘
            MyDrawClock(h, m, s);
            //在statusbar上显示数字时钟
           // statusBar1.Text = String.Format("{0}:{1}:{2}", h, m, s);
            //在lbtime上显示数字时钟 
            lbTime.Text = GetTime(); 
        }

        //定义秒针，分针，时针的长度
        private const int s_pinlen = 75;
        private const int m_pinlen = 50;
        private const int h_pinlen = 25;

        private void MyDrawClock(int h, int m, int s)
        {
            Graphics g = this.CreateGraphics();
            //清除所有

            //得到当前矩形值
            Rectangle rect = this.ClientRectangle;
            //新建矩形对象距离 底边250 右边230 横纵半径都是150 如果不都是150 两个不相等
            //比如一个是140 一个是160 则画出来的是一个椭圆 
            rect = new Rectangle(this.ClientRectangle.Right - 250, this.ClientRectangle.Bottom - 230, 150, 150);
            g.Clear(Color.White);
            //创建Pen                                    
            Pen myPen = new Pen(Color.Blue, 1);
            //绘制表盘
            g.DrawEllipse(myPen, rect);
            //表中心点 
            Point centerPoint = new Point(this.ClientRectangle.Width / 2, this.ClientRectangle.Height / 2);
            //计算出秒针，分针，时针的另外端点
            Point secPoint = new Point((int)(centerPoint.X   (Math.Sin(6 * s * Math.PI / 180)) * s_pinlen),
                                            (int)(centerPoint.Y - (Math.Cos(6 * s * Math.PI / 180)) * s_pinlen));
            Point minPoint = new Point((int)(centerPoint.X   (Math.Sin(6 * m * Math.PI / 180)) * m_pinlen),
                                         (int)(centerPoint.Y - (Math.Cos(6 * m * Math.PI / 180)) * m_pinlen));

            Point hourPoint = new Point((int)(centerPoint.X   (Math.Sin(((30 * h)   (m / 2)) * Math.PI / 180)) * h_pinlen),
                                         (int)(centerPoint.Y - (Math.Cos(((30 * h)   (m / 2)) * Math.PI / 180)) * h_pinlen));
            //以不同的颜色绘制
            g.DrawLine(myPen, centerPoint, secPoint);
            myPen = new Pen(Color.Green, 2);
            g.DrawLine(myPen, centerPoint, minPoint);
            myPen = new Pen(Color.Red, 4);
            g.DrawLine(myPen, centerPoint, hourPoint);
        }


    }