internal static double PointToSegment(XVertex A, XVertex B, XVertex C)
{
double dot1 = Dot3Product(A, B, C);
if (dot1 > 0)
{
return(B.Distance(C));
}
double dot2 = Dot3Product(B, A, C);
if (dot2 > 0)
{
return(A.Distance(C));
}
double dist = Cross3Product(A, B, C) / A.Distance(B);
return(Math.Abs(dist));
}