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https://github.com/boostorg/geometry.git
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Added example to work with units
[SVN r67570]
This commit is contained in:
Barend Gehrels
parent
4e019a7227
commit
7adc8b2d06
207
example/08_units_example.cpp
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207
example/08_units_example.cpp
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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//
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// Copyright Barend Gehrels 2011, Geodan, Amsterdam, the Netherlands
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Example combining Boost.Geometry with Boost.Units
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#include <iostream>
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#include <boost/geometry/geometry.hpp>
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#include <boost/units/quantity.hpp>
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#include <boost/units/systems/si/length.hpp>
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#include <boost/units/systems/cgs/length.hpp>
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#include <boost/units/systems/si/io.hpp>
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// TEMPORARY this will go to somewhere within Boost.Geometry
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namespace boost { namespace geometry
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{
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namespace cs
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{
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template <typename Unit>
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struct units_cartesian {};
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}
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namespace traits
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{
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template<typename U>
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struct cs_tag<cs::units_cartesian<U> >
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{
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typedef cartesian_tag type;
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};
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}
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namespace model
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{
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// Define a point type to interoperate with Boost.Units, having
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// 1. a constructor taking quantities
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// 2. defining a quantified coordinate system
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// Note that all values are still stored in "normal" types as double
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template <typename U, std::size_t D = 2, typename T = double, typename CS = cs::units_cartesian<U> >
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class quantity_point : public model::point<T, D, CS>
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{
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typedef boost::units::quantity<U, T> qtype;
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public :
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// Templated constructor to allow constructing with other units then qtype,
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// e.g. to convert from centimeters to meters
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template <typename Q>
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inline quantity_point(Q const& x, Q const& y)
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: model::point<T, D, CS>(
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qtype(x).value(),
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qtype(y).value())
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{}
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};
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}
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// Adapt quantity_point to the Point Concept
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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namespace traits
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{
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template <typename Units, std::size_t DimensionCount, typename CoordinateType, typename CoordinateSystem>
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struct tag<model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem> >
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{
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typedef point_tag type;
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};
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template<typename Units, std::size_t DimensionCount, typename CoordinateType, typename CoordinateSystem>
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struct coordinate_type<model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem> >
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{
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typedef CoordinateType type;
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};
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template<typename Units, std::size_t DimensionCount, typename CoordinateType, typename CoordinateSystem>
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struct coordinate_system<model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem> >
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{
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typedef CoordinateSystem type;
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};
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template<typename Units, std::size_t DimensionCount, typename CoordinateType, typename CoordinateSystem>
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struct dimension<model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem> >
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: boost::mpl::int_<DimensionCount>
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{};
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template<typename Units, std::size_t DimensionCount, typename CoordinateType, typename CoordinateSystem, std::size_t Dimension>
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struct access<model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem>, Dimension >
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{
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static inline CoordinateType get(
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model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem> const& p)
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{
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return p.template get<Dimension>();
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}
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static inline void set(model::quantity_point<Units, DimensionCount, CoordinateType, CoordinateSystem>& p,
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CoordinateType const& value)
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{
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p.template set<Dimension>(value);
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}
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};
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} // namespace traits
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#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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// For extra support for functions as distance,area,get,set
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namespace units
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{
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namespace detail
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{
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// Define an extra meta-function to get the units of a coordinate system
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template <typename CS>
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struct unit_dimension
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{
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// define it as dimensionless
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// or MPL ASSERT
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};
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template <typename U>
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struct unit_dimension<cs::units_cartesian<U> >
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{
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typedef U type;
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};
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}
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// Define an extra metafunction to define the quantity of a Geometry type
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template <typename Geometry, typename CT = typename coordinate_type<Geometry>::type>
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struct quantity
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{
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typedef boost::units::quantity
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<
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typename detail::unit_dimension
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<
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typename coordinate_system<Geometry>::type
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>::type,
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CT
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> type;
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};
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template <typename Geometry1, typename Geometry2>
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inline typename quantity<Geometry1, typename distance_result<Geometry1, Geometry2>::type>::type
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distance(Geometry1 const& g1, Geometry2 const& g2)
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{
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typedef typename quantity<Geometry1, typename distance_result<Geometry1, Geometry2>::type>::type q;
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return q::from_value(geometry::distance(g1, g2));
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}
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template <std::size_t Index, typename Point>
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inline typename quantity<Point>::type get(Point const& p)
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{
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typedef typename quantity<Point>::type q;
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return q::from_value(geometry::get<Index>(p));
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}
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}
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}}
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// END TEMPORARY
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int main(void)
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{
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using namespace boost::geometry;
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using namespace boost::units;
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// 1: using it directly
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{
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typedef model::quantity_point<si::length, 2> point;
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point p1(1 * si::meter, 2 * si::meter);
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point p2(3 * si::meter, 4 * si::meter);
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std::cout << get<0>(p2) << std::endl;
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// This is a little inconvenient:
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quantity<si::length> d = distance(p1, p2) * si::meter;
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std::cout << d << std::endl;
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}
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// 2: same but now using centimeters, and using boost::geometry::units::
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{
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typedef model::quantity_point<cgs::length, 2> point;
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point p1(1 * si::meter, 2 * si::meter);
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point p2(3 * si::meter, 4 * si::meter);
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std::cout << boost::geometry::units::get<0>(p2) << std::endl;
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quantity<cgs::length> d = boost::geometry::units::distance(p1, p2);
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std::cout << d << std::endl;
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}
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return 0;
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}
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171
example/08_units_example.vcproj
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171
example/08_units_example.vcproj
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@ -0,0 +1,171 @@
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<?xml version="1.0" encoding="Windows-1252"?>
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<VisualStudioProject
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ProjectType="Visual C++"
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Version="8.00"
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Name="08_units_example"
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ProjectGUID="{3D41FD4E-88B0-4A2A-9884-D434831A236C}"
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RootNamespace="08_units_example"
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Keyword="Win32Proj"
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>
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<Platforms>
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<Platform
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Name="Win32"
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/>
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</Platforms>
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<ToolFiles>
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</ToolFiles>
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<Configurations>
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<Configuration
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Name="Debug|Win32"
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OutputDirectory="$(SolutionDir)$(ConfigurationName)"
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IntermediateDirectory="$(ConfigurationName)\08_units_example"
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ConfigurationType="1"
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InheritedPropertySheets=".\boost.vsprops"
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CharacterSet="1"
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>
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<Tool
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Name="VCPreBuildEventTool"
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/>
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<Tool
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Name="VCCustomBuildTool"
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/>
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<Tool
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Name="VCXMLDataGeneratorTool"
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/>
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<Tool
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Name="VCWebServiceProxyGeneratorTool"
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/>
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<Tool
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Name="VCMIDLTool"
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/>
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<Tool
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Name="VCCLCompilerTool"
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Optimization="0"
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PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE"
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RuntimeLibrary="1"
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DisableLanguageExtensions="false"
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UsePrecompiledHeader="0"
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DebugInformationFormat="1"
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/>
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<Tool
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Name="VCManagedResourceCompilerTool"
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/>
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<Tool
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Name="VCResourceCompilerTool"
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/>
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<Tool
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Name="VCPreLinkEventTool"
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/>
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<Tool
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Name="VCLinkerTool"
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GenerateDebugInformation="true"
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SubSystem="1"
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TargetMachine="1"
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/>
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<Tool
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Name="VCALinkTool"
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/>
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<Tool
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Name="VCManifestTool"
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/>
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<Tool
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Name="VCXDCMakeTool"
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/>
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<Tool
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Name="VCBscMakeTool"
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/>
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<Tool
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Name="VCFxCopTool"
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/>
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<Tool
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Name="VCAppVerifierTool"
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/>
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<Tool
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Name="VCWebDeploymentTool"
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/>
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<Tool
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Name="VCPostBuildEventTool"
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/>
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</Configuration>
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<Configuration
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Name="Release|Win32"
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OutputDirectory="$(SolutionDir)$(ConfigurationName)"
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IntermediateDirectory="$(ConfigurationName)\08_units_example"
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ConfigurationType="1"
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InheritedPropertySheets=".\boost.vsprops"
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CharacterSet="1"
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WholeProgramOptimization="1"
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>
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<Tool
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Name="VCPreBuildEventTool"
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/>
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<Tool
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Name="VCCustomBuildTool"
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/>
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<Tool
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Name="VCXMLDataGeneratorTool"
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/>
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<Tool
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Name="VCWebServiceProxyGeneratorTool"
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/>
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<Tool
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Name="VCMIDLTool"
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/>
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<Tool
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Name="VCCLCompilerTool"
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PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE"
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UsePrecompiledHeader="0"
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/>
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<Tool
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Name="VCManagedResourceCompilerTool"
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/>
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<Tool
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Name="VCResourceCompilerTool"
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/>
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<Tool
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Name="VCPreLinkEventTool"
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/>
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<Tool
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Name="VCLinkerTool"
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SubSystem="1"
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OptimizeReferences="2"
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EnableCOMDATFolding="2"
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TargetMachine="1"
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/>
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<Tool
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Name="VCALinkTool"
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/>
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<Tool
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Name="VCManifestTool"
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/>
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<Tool
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Name="VCXDCMakeTool"
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/>
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<Tool
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Name="VCBscMakeTool"
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/>
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<Tool
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Name="VCFxCopTool"
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/>
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<Tool
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Name="VCAppVerifierTool"
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/>
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<Tool
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Name="VCWebDeploymentTool"
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/>
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<Tool
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Name="VCPostBuildEventTool"
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/>
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</Configuration>
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</Configurations>
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<References>
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</References>
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<Files>
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<File
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RelativePath=".\08_units_example.cpp"
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>
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</File>
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</Files>
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<Globals>
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</Globals>
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</VisualStudioProject>
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@ -20,6 +20,7 @@ exe 06_a_transformation_example : 06_a_transformation_example.cpp ;
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exe 06_b_transformation_example : 06_b_transformation_example.cpp ;
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exe 07_a_graph_route_example : 07_a_graph_route_example.cpp ;
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exe 07_b_graph_route_example : 07_b_graph_route_example.cpp ;
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exe 08_units_example : 08_units_example.cpp ;
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exe c01_custom_point_example : c01_custom_point_example.cpp ;
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exe c02_custom_box_example : c02_custom_box_example.cpp ;
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