public static double DistanceLinePoint(Vector2D start, Vector2D end, Vector2D v, out Vector2D nearest)
{
Vector2D dir = v - start;
Vector2D borderDir = (end - start).Normalized( );
double dot = borderDir.Dot(dir);
if (dot < 0)
{
nearest = start;
return((v - start).Length);
}
if (dot > (end - start).Length)
{
nearest = end;
return((v - end).Length);
}
Vector2D tangent = borderDir * dot;
nearest = start + tangent;
Vector2D normal = dir - tangent;
return(normal.Length);
}
