IsPointInPolygon.cs

public bool IsPointInPolygon(List<Location> poly, Location point)
{
    int i, j;
    var c = false;
    for (i = 0, j = poly.Count - 1; i < poly.Count; j = i++)
    {
        if ((poly[i].Lt <= point.Lt && point.Lt < poly[j].Lt 
             || poly[j].Lt <= point.Lt && point.Lt < poly[i].Lt) 
            && point.Lg < (poly[j].Lg - poly[i].Lg) * (point.Lt - poly[i].Lt) 
            / (poly[j].Lt - poly[i].Lt) + poly[i].Lg)
        {

            c = !c;
        }
    }

    return c;
}