geometry/doc/src/examples/rtree/quick_start.cpp

// Boost.Geometry Index
//
// Quickbook Examples
//
// Copyright (c) 2011-2012 Adam Wulkiewicz, Lodz, Poland.
//
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

//[rtree_quickstart_include

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

#include <boost/geometry/index/rtree.hpp>

// to store queries results
#include <vector>

// just for output
#include <iostream>
#include <boost/foreach.hpp>

namespace bg = boost::geometry;
namespace bgi = boost::geometry::index;
//]

int main(void)
{
    //[rtree_quickstart_valuetype
    typedef bg::model::point<float, 2, bg::cs::cartesian> point;
    typedef bg::model::box<point> box;
    typedef std::pair<box, unsigned> value;
    //]

    //[rtree_quickstart_create
    // create the rtree using default constructor
    bgi::rtree< value, bgi::quadratic<32, 8> > rtree;
    //]

    //[rtree_quickstart_insert
    // create some values
    for ( unsigned i = 0 ; i < 10 ; ++i )
    {
        // create a box
        box b(point(i, i), point(i + 0.5f, i + 0.5f));
        // insert new value
        rtree.insert(std::make_pair(b, i));
    }
    //]
    
    //[rtree_quickstart_spatial_query
    // find values intersecting some area defined by a box
    box query_box(point(0, 0), point(5, 5));
    std::vector<value> result_s;
    rtree.spatial_query(query_box, std::back_inserter(result_s));
    //]

    //[rtree_quickstart_nearest_query
    // find 5 nearest values to a point
    std::vector<value> result_n;
    rtree.nearest_query(point(0, 0), 5, std::back_inserter(result_n));
    //]

    //[rtree_quickstart_output
    std::cout << "spatial query result:" << std::endl;
    BOOST_FOREACH(value const& v, result_s)
        std::cout << bg::wkt<box>(v.first) << " - " << v.second << std::endl;
    std::cout << "knn query result:" << std::endl;
    BOOST_FOREACH(value const& v, result_n)
        std::cout << bg::wkt<box>(v.first) << " - " << v.second << std::endl;
    //]

    return 0;
}