绘图环形阵列C#

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

private void Form1_Paint(object sender, PaintEventArgs e)       {           for (int i = 0; i < 360; i++)//循环一圈           {               if (i % 10 == 0)//设置角度               {                   double y = Math.Sin(i / 360.0 * 6.28) * 100;//y轴位置由sin决定                  double x = Math.Cos(i / 360.0 * 6.28) * 100;//y轴位置由cos决定                  // double x = i ;//y轴位置由cos决定,正弦波                   dr((float)x, (float)y, "圈");//设置环形阵列的文字，NULL时默认为一个小圆圈               }           }       }         public void dr(float x, float y, string str)       {           Graphics gr = CreateGraphics();           Pen pen = new Pen(Color.Red, 1);           Font font = new Font("黑体", 12);           Brush brush = new SolidBrush(Color.Red);           if (str == null)           {               gr.DrawEllipse(pen, x + 200f, y + 200f, 10, 10);//默认为一个小圆圈             }           else           {               gr.DrawString(str, font, brush, x + 200, y + 200);//画字符串               pen.Dispose();               gr.Dispose();           }       }

运行结果：