geometry.hpp

Provides header-only, generic C++ interfaces for geometry types, geometry collections, and features.

maplibre::geometry::point
maplibre::geometry::multi_point
maplibre::geometry::line_string
maplibre::geometry::multi_line_string
maplibre::geometry::polygon
maplibre::geometry::multi_polygon
maplibre::geometry::geometry_collection
maplibre::feature::feature (experimental)

Design

These types are designed to be easy to parse and serialize to GeoJSON.

They should also be a robust and high performance container for data processing and conversion.

Goals

Header-only
Fast compile
c++11/c++14 compatibility
No external dependencies for usage of core types (point, line_string, etc)
Minimal dependencies for usage of enclosing geometry type (maplibre::variant)
Easily adaptable to boost::geometry

Usage

Using a single type directly (requires no external dependencies):

#include <maplibre/geometry/point.hpp>
#include <iostream>

using maplibre::geometry::point;

int main() {
    point<double> pt(1.0,0.0);
    std::clog << "x: " << pt.x << " y: " << pt.y << "\n";
}

Creating a geometry collection (depends on https://github.com/mapbox/variant):

#include <maplibre/geometry/geometry.hpp>
#include <maplibre/variant.hpp>
#include <iostream>

using maplibre::geometry::geometry_collection;
using maplibre::geometry::geometry;
using maplibre::geometry::point;

using point_type = point<double>;

struct printer
{
    printer() {}

    void operator()(point_type const& pt) const
    {
        std::clog << "x: " << pt.x << " y: " << pt.y << "\n";
    }

    template <typename T>
    void operator()(T const& g) const
    {
        std::clog << "encountered non-point geometry\n";
    }
};

int main() {
    geometry_collection<double> gc;
    gc.emplace_back(point_type(1.0,0.0));
    geometry<double> const& geom = gc.at(0);
    printer visitor;
    mapbox::util::apply_visitor(visitor,geom);
}

License

louwers/geometry.hpp

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