private MxDrawDimRadial DrawDimRadial(MxDrawPoint center, MxDrawPoint chordPoint, double leaderLength)
        {
            MxDrawApplication mxapp = new MxDrawApplication();
            MxDrawDatabase mxdb = mxapp.WorkingDatabase();
            MxDrawBlockTableRecord btr = mxdb.CurrentSpace();

            ////////////////////////////////////
            double r = center.DistanceTo(chordPoint);
            btr.AddCircle(center.x, center.y, r);
   

            MxDrawVector3d vec = center.SumVector(chordPoint);

            MxDrawPoint txtpos = new MxDrawPoint();
            txtpos.x = center.x;
            txtpos.y = center.y;

            vec.Normalize();
            vec.Mult(0.1);

            txtpos.Sum(vec);

            MxDrawDimRadial ent = btr.AddDimRadial(center.x, center.y, chordPoint.x, chordPoint.y, leaderLength);
            ent.colorIndex = MCAD_COLOR.mcRed;
            ent.TextPosition = txtpos;
     


            ent.RecomputeDimBlock(true);
            btr.Close();
            return ent;
        }