Boost.Geometryはsvgも出力できるらしい。

※rev.69338時点のコードのため、正式リリース時には動かなくなっている可能性があります。

ちなみに外部ライブラリは不要です。

// libs/geometry/doc/src/examples/algorithms/make_envelope.cpp
#include <iostream>
#include <fstream>
#include <boost/assign.hpp>

#include <boost/algorithm/string.hpp>
#include <boost/geometry/geometry.hpp>
#include <boost/geometry/geometries/geometries.hpp>
#include <boost/geometry/extensions/io/svg/svg_mapper.hpp>

template <typename Geometry1, typename Geometry2>
void create_svg(std::string const& filename, Geometry1 const& a, Geometry2 const& b)
{
    typedef typename boost::geometry::point_type<Geometry1>::type point_type;
    std::ofstream svg(filename.c_str());

    boost::geometry::svg_mapper<point_type> mapper(svg, 400, 400);
    mapper.add(a);
    mapper.add(b);

    mapper.map(a, "fill-opacity:0.5;fill:rgb(153,204,0);stroke:rgb(153,204,0);stroke-width:2");
    mapper.map(b, "opacity:0.8;fill:none;stroke:rgb(255,128,0);stroke-width:4;stroke-dasharray:1,7;stroke-linecap:round");
}

int main()
{
    using namespace boost::assign;

    typedef boost::geometry::model::d2::point_xy<double> point;

    boost::geometry::model::ring<point> ring;
    ring +=
        point(4.0, -0.5), point(3.5, 1.0),
        point(2.0, 1.5), point(3.5, 2.0),
        point(4.0, 3.5), point(4.5, 2.0),
        point(6.0, 1.5), point(4.5, 1.0),
        point(4.0, -0.5);

    typedef boost::geometry::model::box<point> box;

    std::cout
        << "make_envelope:"
        << boost::geometry::dsv(boost::geometry::make_envelope<box>(ring))
        << std::endl;

    create_svg("make_envelope.svg", ring, boost::geometry::make_envelope<box>(ring));
}