/Src/Dependencies/Boost/libs/geometry/doc/concept/point.qbk

 1[/============================================================================
 2  Boost.Geometry (aka GGL, Generic Geometry Library)
 3
 4  Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
 5  Copyright (c) 2009-2011 Barend Gehrels, Amsterdam, the Netherlands.
 6  Copyright (c) 2009-2011 Bruno Lalande, Paris, France.
 7
 8  Use, modification and distribution is subject to the Boost Software License,
 9  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
10  http://www.boost.org/LICENSE_1_0.txt)
11=============================================================================/]
12
13[section:concept_point Point Concept]
14
15[heading Description]
16[concept Point..point]
17
18A 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]).
19The point is the most basic geometry of Boost.Geometry, most other geometries consist of points. 
20['(Exceptions are box and segment, which might consist of two points but that is not necessarily the case.)]
21
22[heading Concept Definition]
23
24The Point Concept is defined as following:
25
26* there must be a specialization of `traits::tag`, defining `point_tag` as type
27* there must be a specialization of `traits::coordinate_type`, defining the type of its coordinates
28* there must be a specialization of `traits::coordinate_system`, defining its coordinate system
29	 (cartesian, spherical, etc)
30* there must be a specialization of `traits::dimension`, defining its number of dimensions (2, 3, ...) 
31	(hint: derive it conveniently from `boost::mpl::int_<X>` for X Dimensional)
32* there must be a specialization of `traits::access`, per dimension, with two functions:
33	* `get` to get a coordinate value
34	* `set` to set a coordinate value (this one is not checked for ConstPoint)
35	
36[heading Available Models]	
37* [link geometry.reference.models.model_point model::point]
38* [link geometry.reference.models.model_d2_point_xy model::d2::point_xy]
39* a lat long point (currently in an extension)
40* [link geometry.reference.adapted.c_array C array]
41* [link geometry.reference.adapted.boost_array Boost.Array]
42* [link geometry.reference.adapted.boost_fusion Boost.Fusion]
43* [link geometry.reference.adapted.boost_polygon Boost.Polygon]
44* [link geometry.reference.adapted.boost_tuple Boost.Tuple]
45* other point types, adapted e.g. using one of the [link geometry.reference.adapted registration macro's]
46
47[endsect]
48
49