c# winform时钟的实现代码

代码如下：

using system;
 using system.collections.generic;
 using system.componentmodel;
 using system.data;
 using system.drawing;

 using system.text;
 using system.windows.forms;

 namespace simpclock
 {
     public partial class form1 : form
     {
         datetime date = datetime.now;

         public form1()
         {
             initializecomponent();

         }

         private void form1_load(object sender, eventargs e)
         {
             date = datetime.now;

         }

         private void onpaint(object sender, painteventargs e)
         {
             font font = new font("times new roman", 20);
             graphics g = creategraphics();
             g.drawstring(date.tostring(), font, brushes.firebrick, 10,330 );
             g.drawstring(date.dayofweek.tostring(), font, brushes.red, 250, 330);
             drawdial(g);
             drawsecondpointer(g);
             drawminutepointer(g);
             drawhourpointer(g);

         }
         //刷新时间
         private void ontime(object sender, eventargs e)
         {
             date = datetime.now;
             invalidate();
         }
         //画钟表
         //表盘部分
         point getposition(int s, point center, double radius)//定位
         {
             point p = new point();
             double x = center.x + radius * math.sin(math.pi / 30 * s);
             double y = center.y - radius * math.cos(math.pi / 30 * s);
             p.x = (int)x;
             p.y = (int)y;
             return p;
         }

         void drawdial(graphics g)//外圆及刻度
         {
             int n;
             rectangle rect = new rectangle(40, 10, 300, 300);
             //g.fillellipse(brushes.white, 40, 10, 300, 300);
             g.drawellipse(new pen(color.black, 3), rect);
             point p1, p2;
             point center = new point(190, 160);
             for (n = 0; n < 60; n++)
             {
                 p1 = getposition(n, center, 150);
                 if (n % 5 == 0)
                 {
                     p2 = getposition(n, center, 130);
                     g.drawline(new pen(color.black, 2), p1, p2);
                 }
                 else
                 {
                     p2 = getposition(n, center, 140);
                     g.drawline(pens.red, p1, p2);
                 }
             }
             font font = new font("times new roman", 20);
             n = 0;
             p1 = getposition(n, center, 130);
             g.drawstring("xii", font, brushes.black, p1.x - 25, p1.y);
             n += 15;
             p1 = getposition(n, center, 130);
             g.drawstring("iii", font, brushes.black, p1.x - 35, p1.y - 15);
             n += 15;
             p1 = getposition(n, center, 130);
             g.drawstring("vi", font, brushes.black, p1.x - 20, p1.y - 30);
             n += 15;
             p1 = getposition(n, center, 130);
             g.drawstring("ix", font, brushes.black, p1.x, p1.y - 15);
         }
         //秒针部分
         void drawsecondpointer(graphics g)
         {
             point center = new point(190, 160);
             point p;
             p = getposition(date.second, center, 130);
             g.drawline(pens.red, center, p);
             g.fillellipse(brushes.red, new rectangle(p.x - 2, p.y - 2, 4, 4));

         }
         //分针部分
         void drawminutepointer(graphics g)
         {
             point center = new point(190, 160);
             point p;
             p = getposition(date.minute, center, 120);
             g.drawline(pens.blue, center, p);
             //g.fillellipse(brushes.blue, new rectangle(p.x - 4, p.y - 4, 8, 8));
         }
         //时针部分
         point gethourposition(point center, double radius)
         {
             point p = new point();
             int h = date.hour;
             int m = date.minute;
             double t = math.pi / 6 * h + math.pi / 360 * m;
             double x = center.x + radius * math.sin(t);
             double y = center.y - radius * math.cos(t);
             p.x = (int)x;
             p.y = (int)y;
             return p;
         }
         void drawhourpointer(graphics g)
         {
             point center = new point(190, 160);
             point p = gethourposition(center, 100);
             g.drawline(new pen(brushes.black, 2), center, p);
             //去指针圆尖
             // g.fillellipse(brushes.black,
             //              new rectangle(p.x - 6, p.y - 6, 12, 12));
             g.fillellipse(brushes.yellowgreen,
             new rectangle(center.x - 6, center.y - 6, 12, 12));

 
         }

     }
}