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- [/============================================================================
- 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_box Box Concept]
- [heading Description]
- [concept Box..box]
- A box is a geometry with (usually) two or three dimensions, having its axis aligned to the coordinate system.
- The box is not one of the basic types in Boost.Geometry (point, linestring, polygon) but it is a ['helper type].
- The main reasons for the box existance are its usefulness for indexing (a spatial index, or splitting a geometry
- into monotonic sections) and it is the output of the [link geometry.reference.algorithms.envelope envelope] algorithm.
- Therefore, a box is axis aligned (the envelope is also called aabb, axis aligned bounding box).
- [heading Concept Definition]
- The Box Concept is defined as following:
- * there must be a specialization of `traits::tag`, defining `box_tag` as type
- * there must be a specialization of `traits::point_type` to define the underlying point type
- (even if it does not consist of points, it should define this type, to indicate the points it can work with)
- * there must be a specialization of `traits::indexed_access`, per index (`min_corner`, `max_corner`) and per dimension, with two functions:
- * `get` to get a coordinate value
- * `set` to set a coordinate value (this one is not checked for ConstBox)
- [heading Available Models]
- * [link geometry.reference.models.model_box model::box]
- [endsect]
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