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multi_line, a collection of linestring
Multi-linestring can be used to group lines belonging to each other, e.g. a highway (with interruptions)
template<typename LineString, template< typename, typename > class Container, template< typename > class Allocator> class model::multi_linestring : public Container< LineString, Allocator< LineString > > { // ... };
| Parameter | Default | Description | 
|---|---|---|
| typename LineString | ||
| template< typename, typename > class Container | std::vector | |
| template< typename > class Allocator | std::allocator | 
| Function | Description | Parameters | 
|---|---|---|
| 
 multi_linestring() 
 | Default constructor, creating an empty multi_linestring. | |
| 
 multi_linestring(std::initializer_list< LineString > l) 
 | Constructor taking std::initializer_list, filling the multi_linestring. | std::initializer_list< LineString >: l: | 
Either
          #include <boost/geometry/geometries/geometries.hpp>
        
Or
          #include <boost/geometry/geometries/multi_linestring.hpp>
        
Declaration and use of the Boost.Geometry model::multi_linestring, modelling the MultiLinestring Concept
#include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/geometries.hpp> namespace bg = boost::geometry; int main() { typedef bg::model::point<double, 2, bg::cs::cartesian> point_t; typedef bg::model::linestring<point_t> linestring_t; typedef bg::model::multi_linestring<linestring_t> mlinestring_t; mlinestring_t mls1;#if !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) \ && !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) mlinestring_t mls2{{{0.0, 0.0}, {0.0, 1.0}, {2.0, 1.0}}, {{1.0, 0.0}, {2.0, 0.0}}};
#endif mls1.resize(2);
bg::append(mls1[0], point_t(0.0, 0.0));
bg::append(mls1[0], point_t(0.0, 1.0)); bg::append(mls1[0], point_t(2.0, 1.0)); bg::append(mls1[1], point_t(1.0, 0.0));
bg::append(mls1[1], point_t(2.0, 0.0)); double l = bg::length(mls1); std::cout << l << std::endl; return 0; }
| Default-construct a multi_linestring. | |
| Construct a multi_linestring containing two linestrings, using C++11 unified initialization syntax. | |
| Resize a multi_linestring, store two linestrings. | |
| Append point to the first linestring. | |
| Append point to the second linestring. | 
Output:
4