{
        for (int i = 0; i < pts.Count - 1; i++)
        {
            double segmentLen = pts[i].Distance(pts[i + 1]);
            _totalLength += segmentLen;

            double midx = (pts[i].X + pts[i + 1].X) / 2;
            _centSum.X += segmentLen * midx;
            double midy = (pts[i].Y + pts[i + 1].Y) / 2;
            _centSum.Y += segmentLen * midy;
        }
    }