C# sort points along line

@daniel.c wrote:

Hello,

I’m writing C# script in grasshopper. I want to sort points along polyline and create new polyline that goes trough sorted points. I came up with following code:

    Point3d[] sort_pts= culled_pts;
    double[] angles = new double[sort_pts.Length];
    for (int i = 0; i < sort_pts.Length; i++)
    {
      angles[i] = Math.Atan2(sort_pts[i].Y, sort_pts[i].X);
    }
    Array.Sort(angles, sort_pts);
    List<Point3d> final_pts = new List<Point3d>(sort_pts);
    Polyline final_top_poly = new Polyline(final_pts);

The problem is, that if the points Y coordinates are all 0 it breaks and doesnt work. It works if X coordinates are 0 and the rest of combination of coordinates… Any ideas why?
I appreciate the help, thanks.

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Dan.

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