void OnMouseDown(object sender, MouseButtonEventArgs e)
        {
            _isCatch = true;
            _startP = e.GetPosition(rtc1);
        }

        void OnMouseUp(object sender, MouseButtonEventArgs e)
        {
            _isCatch = false;
        }

        void OnMouseMove(object sender, MouseEventArgs e)
        {
            if (_isCatch)
            {
                _endP = e.GetPosition(rtc1);
                var diff_x = _endP.X - _startP.X;
                var diff_y = _endP.Y - _startP.Y;
                var radians = Math.Atan2(diff_x, diff_y);
                _angle = radians * (180 / Math.PI);
            }
        }

void OnMouseDown(object sender, MouseButtonEventArgs e)
        {
            _isCatch = true;
            _startP = e.GetPosition(rtc1);
        }

        void OnMouseUp(object sender, MouseButtonEventArgs e)
        {
            _isCatch = false;
            _curDate = _moveDate;
        }

        void OnMouseMove(object sender, MouseEventArgs e)
        {
            if (_isCatch)
            {
                _endP = e.GetPosition(rtc1);
                var lenA = Math.Sqrt(Math.Pow(_startP.X - _model.Radius, 2) + Math.Pow(_startP.Y - _model.Radius, 2));
                var lenB = Math.Sqrt(Math.Pow(_endP.X - _model.Radius, 2) + Math.Pow(_endP.Y - _model.Radius, 2));
                var lenC = Math.Sqrt(Math.Pow(_startP.X - _endP.X, 2) + Math.Pow(_startP.Y - _endP.Y, 2));

                var radians = Math.Acos((Math.Pow(lenA, 2) + Math.Pow(lenB, 2) - Math.Pow(lenC, 2)) / (2 * lenA * lenB));
                _angle = radians * (180 / Math.PI);
                var res = _gradMin * _angle;
                _moveDate = _curDate.AddMinutes(res);
            }
        }