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因为需要在c#中写一个简单的程序，需要在图形内进行判断，那么首先得把图形绘制出来，下面按照实例，简单的介绍在c#中绘制点，线，面的方法

private void button1_Click(object sender, EventArgs e)  

{  

      using (Graphics x = Graphics.FromImage(flag))  

            {  

                x.Clear(Color.White);  

                //Brush brush = new SolidBrush(Color.Red);  

                Pen pen = new Pen(Color.Black, 1);  

                #region//这里有26个控制点的坐标是通过Calu方法计算得来的，所以看着有些怪异  

                Point ptA = new Point(Calu(0.00), picbox1.Width - Calu(0.00) - 10);//A  

                Point ptB = new Point(Calu(50.00), picbox1.Width - Calu(86.60) - 10);//B  

                Point ptC = new Point(Calu(100.00), picbox1.Width - Calu(0.00) - 10);//C  

                Point ptD = new Point(Calu(15.00), picbox1.Width - Calu(0.00) - 10);//D  

               ....删减一部分...  

                #endregion  

                Point[] pt1 = new Point[5];  

                pt1[0] = ptL; pt1[1] = ptQ; pt1[2] = ptR; pt1[3] = ptM; pt1[4] = ptB;  

                x.DrawPolygon(pen, pt1);//绘制多边形区块1；（绘制一个多边形，他的顶点时pt1里边的五个点）  

               Rectangle rect = new Rectangle(drawPoint.X, drawPoint.Y, 3, 3);//定义矩形,参数为起点横纵坐标以及其长和宽

               //单色填充                  SolidBrush b1 = new SolidBrush(Color.Blue;//定义单色画刷                         x.FillRectangle(b1, rect);//填充这个矩形(绘制一个点，并用一个3*3的矩形来表示它的位置)  

              x.DrawLine(pen,ptA ,ptB);(绘制一条线)  

                }  

}