1.1 --- a/src/lemon/xy.h	Sun Mar 06 21:20:49 2005 +0000
     1.2 +++ b/src/lemon/xy.h	Mon Mar 07 07:53:20 2005 +0000
     1.3 @@ -180,6 +180,29 @@
     1.4      return os;
     1.5    }
     1.6  
     1.7 +  ///Rotate by 90 degrees
     1.8 +
     1.9 +  ///Returns its parameter rotated by 90 degrees in positive direction.
    1.10 +  ///\relates xy
    1.11 +  ///
    1.12 +  template<typename T>
    1.13 +  inline xy<T> rot90(const xy<T> &z)
    1.14 +  {
    1.15 +    return xy<T>(-z.y,z.x);
    1.16 +  }
    1.17 +
    1.18 +  ///Rotate by 270 degrees
    1.19 +
    1.20 +  ///Returns its parameter rotated by 90 degrees in negative direction.
    1.21 +  ///\relates xy
    1.22 +  ///
    1.23 +  template<typename T>
    1.24 +  inline xy<T> rot270(const xy<T> &z)
    1.25 +  {
    1.26 +    return xy<T>(z.y,-z.x);
    1.27 +  }
    1.28 +
    1.29 +  
    1.30  
    1.31    /// A class to calculate or store the bounding box of plainvectors.
    1.32