[Olena-patches] 3249: Improve accu::center.

* mln/accu/center.hh: Returns a vector instead of a site. The vector type can be passed as template parameter. --- milena/ChangeLog | 7 +++++ milena/mln/accu/center.hh | 66 +++++++++++++++++++++++++++----------------- 2 files changed, 47 insertions(+), 26 deletions(-) diff --git a/milena/ChangeLog b/milena/ChangeLog index 8385bcd..79b7000 100644 --- a/milena/ChangeLog +++ b/milena/ChangeLog @@ -1,5 +1,12 @@ 2009-02-03 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; + Improve accu::center. + + * mln/accu/center.hh: Returns a vector instead of a site. The vector + type can be passed as template parameter. + +2009-02-03 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; + Add default constructor to fun_image. * mln/core/image/fun_image.hh: add default constructor and refactor diff --git a/milena/mln/accu/center.hh b/milena/mln/accu/center.hh index 4102925..aba9a80 100644 --- a/milena/mln/accu/center.hh +++ b/milena/mln/accu/center.hh @@ -1,4 +1,4 @@ -// Copyright (C) 2008 EPITA Research and Development Laboratory (LRDE) +// Copyright (C) 2008, 2009 EPITA Research and Development Laboratory (LRDE) // // This file is part of the Olena Library. This library is free // software; you can redistribute it and/or modify it under the terms @@ -32,6 +32,7 @@ /// /// Define an accumulator that computes the mass center of a site set. + # include <mln/accu/internal/base.hh> # include <mln/accu/bbox.hh> @@ -43,11 +44,16 @@ namespace mln /// Generic center accumulator class. - template <typename P> - struct center : public mln::accu::internal::base< P , center<P> > + /// + /// \tparam P the type of site. + /// \tparam V the type of vector to be used as result. + /// The default vector type is the one provided by P. + template <typename P, typename V = typename P::vec> + struct center + : public mln::accu::internal::base<V, center<P,V> > { typedef P argument; - typedef P result; + typedef V result; center(); @@ -55,18 +61,19 @@ namespace mln /// \{ void init(); void take(const argument& t); - void take(const center<P>& other); + void take(const center<P,V>& other); /// \} /// Get the value of the accumulator. - P to_result() const; - operator P () const; + V to_result() const; + operator V() const; + operator P() const; /// Check whether this accu is able to return a result. bool is_valid() const; protected: - algebra::vec<P::dim, float> center_; + V center_; unsigned nsites_; }; @@ -77,10 +84,10 @@ namespace mln struct center : public Meta_Accumulator< center > { - template <typename P> + template <typename P, typename V> struct with { - typedef accu::center<P> ret; + typedef accu::center<P,V> ret; }; }; @@ -91,58 +98,65 @@ namespace mln # ifndef MLN_INCLUDE_ONLY - template <typename P> + template <typename P, typename V> inline - center<P>::center() + center<P,V>::center() { init(); } - template <typename P> + template <typename P, typename V> inline void - center<P>::init() + center<P,V>::init() { center_ = literal::zero; nsites_ = 0; } - template <typename P> + template <typename P, typename V> inline - void center<P>::take(const argument& t) + void center<P,V>::take(const argument& t) { center_ += t.to_vec(); ++nsites_; } - template <typename P> + template <typename P, typename V> inline void - center<P>::take(const center<P>& other) + center<P,V>::take(const center<P,V>& other) { center_ += other.center_; nsites_ += other.nsites_; } - template <typename P> + template <typename P, typename V> inline - P - center<P>::to_result() const + V + center<P,V>::to_result() const { - return P(center_ / nsites_); + return center_ / nsites_; } - template <typename P> + template <typename P, typename V> inline - center<P>::operator P() const + center<P,V>::operator V() const { return to_result(); } - template <typename P> + template <typename P, typename V> + inline + center<P,V>::operator P() const + { + return P(to_result()); + } + + template <typename P, typename V> inline bool - center<P>::is_valid() const + center<P,V>::is_valid() const { return nsites_ > 0; } -- 1.5.6.5