Re: [Boost-users] [Geometry] please help; using buffer() extensions

Subject: Re: [Boost-users] [Geometry] please help; using buffer() extensions
From: John Lilley (john.lilley_at_[hidden])
Date: 2013-02-27 18:34:56

>int main()
>{
>    typedef boost::geometry::model::d2::point_xy<double> point_type;
>    typedef boost::geometry::model::polygon<point_type> polygon;
>
>    // Polygon
>    {
>        polygon my_polygon;
>        boost::geometry::read_wkt("POLYGON ((0 0,0 5,4 5,4 4,3 3,2 4,2 1,3 2,4 1,4 0,0 0))", my_polygon); 
>        boost::geometry::model::multi_polygon<polygon> my_output;
>        boost::geometry::buffer_inserter<polygon>
>            (
>                my_polygon,
>                std::back_inserter(my_output),
>                boost::geometry::strategy::buffer::distance_assymetric<double>(0.4, 0.4),
>                boost::geometry::strategy::buffer::join_round<point_type, point_type>()
>            );
>
>        std::cout << "Input polygon, area: " << boost::geometry::area(my_polygon) << std::endl;
>        std::cout << "Output, area: " << boost::geometry::area(my_output) << std::endl;
>
>    }
>
>    return 0;
>}
>

Barend,
When I compile your example, I get errors from MSVC++ 2010.  I have the latest extensions, but I am using them with the 1.52 release; will that cause problems?
John

1>------ Build started: Project: etl6_EngCore, Configuration: Debug x64 ------
1>  DL_GeometryBasics.cpp
1>F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1112): warning C4267: 'initializing' : conversion from 'size_t' to 'const int', possible loss of data
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1111) : while compiling class template member function 'void boost::geometry::detail::buffer::buffered_piece_collection<Ring>::start_new_ring(void)'
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>
1>          ]
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffer_inserter.hpp(357) : see reference to class template instantiation 'boost::geometry::detail::buffer::buffered_piece_collection<Ring>' being compiled
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>
1>          ]
1>          DL_GeometryBasics.cpp(34) : see reference to function template instantiation 'void boost::geometry::buffer_inserter<polygon,polygon,std::back_insert_iterator<_Container>,boost::geometry::strategy::buffer::distance_assymetric<CoordinateType>,boost::geometry::strategy::buffer::join_round<PointIn,PointOut>>(const GeometryInput &,OutputIterator,const DistanceStrategy &,const JoinStrategy &)' being compiled
1>          with
1>          [
1>              _Container=boost::geometry::model::multi_polygon<polygon>,
1>              CoordinateType=double,
1>              PointIn=point_type,
1>              PointOut=point_type,
1>              GeometryInput=polygon,
1>              OutputIterator=std::back_insert_iterator<boost::geometry::model::multi_polygon<polygon>>,
1>              DistanceStrategy=boost::geometry::strategy::buffer::distance_assymetric<double>,
1>              JoinStrategy=boost::geometry::strategy::buffer::join_round<point_type,point_type>
1>          ]
1>F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(577): warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(567) : while compiling class template member function 'int boost::geometry::detail::buffer::buffered_piece_collection<Ring>::piece_count(const boost::geometry::detail::buffer::buffered_piece_collection<Ring>::buffer_occupation_info &)'
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>
1>          ]
1>F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1130): warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1122) : while compiling class template member function 'int boost::geometry::detail::buffer::buffered_piece_collection<Ring>::add_point(const boost::geometry::model::d2::point_xy<CoordinateType> &)'
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>,
1>              CoordinateType=double
1>          ]
1>F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1141): warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1134) : while compiling class template member function 'boost::geometry::detail::buffer::buffered_piece_collection<Ring>::piece &boost::geometry::detail::buffer::buffered_piece_collection<Ring>::add_piece(boost::geometry::detail::buffer::piece_type,bool)'
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>
1>          ]
1>F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffered_piece_collection.hpp(1177): warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffer_inserter.hpp(192) : see reference to function template instantiation 'boost::geometry::detail::buffer::buffered_piece_collection<Ring>::piece &boost::geometry::detail::buffer::buffered_piece_collection<Ring>::add_piece<std::vector<_Ty,_Ax>>(boost::geometry::detail::buffer::piece_type,const Range &)' being compiled
1>          with
1>          [
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>,
1>              _Ty=point_type,
1>              _Ax=std::allocator<point_type>,
1>              Range=std::vector<point_type,std::allocator<point_type>>
1>          ]
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffer_inserter.hpp(246) : see reference to function template instantiation 'void boost::geometry::detail::buffer::buffer_range<RingOutput,Tag>::iterate<Collection,std::_Vector_const_iterator<_Myvec>,DistanceStrategy,JoinStrategy>(Collection &,Iterator,Iterator,boost::geometry::buffer_side_selector,const DistanceStrategy &,const JoinStrategy &,bool)' being compiled
1>          with
1>          [
1>              RingOutput=output_ring_type,
1>              Tag=boost::geometry::ring_tag,
1>              Collection=boost::geometry::detail::buffer::buffered_piece_collection<boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>>,
1>              _Myvec=std::_Vector_val<point_type,std::allocator<point_type>>,
1>              DistanceStrategy=boost::geometry::strategy::buffer::distance_assymetric<double>,
1>              JoinStrategy=boost::geometry::strategy::buffer::join_round<point_type,point_type>,
1>              Iterator=std::_Vector_const_iterator<std::_Vector_val<point_type,std::allocator<point_type>>>
1>          ]
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffer_inserter.hpp(313) : see reference to function template instantiation 'void boost::geometry::dispatch::buffer_inserter<Tag,RingInput,RingOutput>::apply<Collection,DistanceStrategy,JoinStrategy>(const RingInput &,Collection &,const DistanceStrategy &,const JoinStrategy &)' being compiled
1>          with
1>          [
1>              Tag=boost::geometry::ring_tag,
1>              RingInput=input_ring_type,
1>              RingOutput=output_ring_type,
1>              Collection=boost::geometry::detail::buffer::buffered_piece_collection<boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>>,
1>              DistanceStrategy=boost::geometry::strategy::buffer::distance_assymetric<double>,
1>              JoinStrategy=boost::geometry::strategy::buffer::join_round<point_type,point_type>
1>          ]
1>          F:\DataManagement\RPDM\Server\libraries\boost\boost/geometry/extensions/algorithms/buffer/buffer_inserter.hpp(364) : see reference to function template instantiation 'void boost::geometry::dispatch::buffer_inserter<Tag,RingInput,RingOutput>::apply<boost::geometry::detail::buffer::buffered_piece_collection<Ring>,DistanceStrategy,JoinStrategy>(const PolygonInput &,Collection &,const DistanceStrategy &,const JoinStrategy &)' being compiled
1>          with
1>          [
1>              Tag=boost::geometry::polygon_tag,
1>              RingInput=polygon,
1>              RingOutput=polygon,
1>              Ring=boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>,
1>              DistanceStrategy=boost::geometry::strategy::buffer::distance_assymetric<double>,
1>              JoinStrategy=boost::geometry::strategy::buffer::join_round<point_type,point_type>,
1>              PolygonInput=polygon,
1>              Collection=boost::geometry::detail::buffer::buffered_piece_collection<boost::geometry::model::ring<point_type,true,true,std::vector,std::allocator>>
1>          ]
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========