Boost C++ Libraries

multi_line, a collection of linestring

Description

Multi-linestring can be used to group lines belonging to each other, e.g. a highway (with interruptions)

Model of

MultiLineString Concept

Synopsis

template<typename LineString, template< typename, typename > class Container, template< typename > class Allocator>
class model::multi_linestring
      : public std::vector< LineString, std::allocator< LineString > >
{
  // ...
};

Template parameter(s)

Constructor(s)

multi_linestring()

multi_linestring(std::initializer_list< LineString > l)

Header

Either

#include <boost/geometry/geometries/geometries.hpp>

Or

#include <boost/geometry/geometries/multi_linestring.hpp>

Examples

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; 
    mlinestring_t mls2{{{0.0, 0.0}, {0.0, 1.0}, {2.0, 1.0}},
                       {{1.0, 0.0}, {2.0, 0.0}}}; 

    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;
}

Output:

4