internal bool FractionPointOnDrawedLine(double fraction, out PointF point)
        {
            bool pointValid = false;

            point = PointF.Empty;

            if (drawedLine != null)
            {
                point      = drawedLine.Fraction((float)fraction);
                pointValid = true;
            }
            return(pointValid);
        }
 internal PointF FractionPoint(double fraction)
 {
     return(logicalLine.Fraction((float)fraction));
 }