| [/============================================================================ |
| Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| Copyright (c) 2009-2012 Mateusz Loskot, London, UK. |
| Copyright (c) 2009-2012 Barend Gehrels, Amsterdam, the Netherlands. |
| Copyright (c) 2009-2012 Bruno Lalande, Paris, France. |
| |
| Use, modification and distribution is subject to the Boost Software License, |
| Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| http://www.boost.org/LICENSE_1_0.txt) |
| =============================================================================/] |
| |
| [section:concept_point Point Concept] |
| |
| [heading Description] |
| [concept Point..point] |
| |
| A point is ['an entity that has a location in space or on a plane, but has no extent] ([@http://en.wikipedia.org/wiki/Point_(geometry) wiki]). |
| The point is the most basic geometry of Boost.Geometry, most other geometries consist of points. |
| ['(Exceptions are box and segment, which might consist of two points but that is not necessarily the case.)] |
| |
| [heading Concept Definition] |
| |
| The Point Concept is defined as following: |
| |
| * there must be a specialization of `traits::tag`, defining `point_tag` as type |
| * there must be a specialization of `traits::coordinate_type`, defining the type of its coordinates |
| * there must be a specialization of `traits::coordinate_system`, defining its coordinate system |
| (cartesian, spherical, etc) |
| * there must be a specialization of `traits::dimension`, defining its number of dimensions (2, 3, ...) |
| (hint: derive it conveniently from `boost::mpl::int_<X>` for X Dimensional) |
| * there must be a specialization of `traits::access`, per dimension, with two functions: |
| * `get` to get a coordinate value |
| * `set` to set a coordinate value (this one is not checked for ConstPoint) |
| |
| [heading Available Models] |
| * [link geometry.reference.models.model_point model::point] |
| * [link geometry.reference.models.model_d2_point_xy model::d2::point_xy] |
| * a lat long point (currently in an extension) |
| * [link geometry.reference.adapted.c_array C array] |
| * [link geometry.reference.adapted.boost_array Boost.Array] |
| * [link geometry.reference.adapted.boost_fusion Boost.Fusion] |
| * [link geometry.reference.adapted.boost_polygon Boost.Polygon] |
| * [link geometry.reference.adapted.boost_tuple Boost.Tuple] |
| * other point types, adapted e.g. using one of the [link geometry.reference.adapted registration macro's] |
| |
| [endsect] |
| |
| |
