public static void DrawCircle(Circle circle, Color color)
 {
     GLUtil.SetColor(color);
     Gl.glBegin(Gl.GL_LINE_LOOP);
     PlotCircleVertices(circle.X, circle.Y, circle.Radius);
     Gl.glEnd();
 }
 public static void DrawDashedCircle(Circle circle, Color color)
 {
     Gl.glPushAttrib(Gl.GL_ENABLE_BIT);
     {
         Gl.glLineStipple(1, 0x00FF);
         Gl.glEnable(Gl.GL_LINE_STIPPLE);
         DrawCircle(circle, color);
     }
     Gl.glPopAttrib();
 }