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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
- // 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)
- //
- // Linestring Polygon Overlay Example
- // NOTE: this example is obsolete. Boost.Geometry can now
- // overlay linestrings/polygons.
- // This sample will be removed in next version.
- #include <fstream>
- #include <iostream>
- #include <string>
- #include <vector>
- #include <boost/foreach.hpp>
- #include <boost/geometry/geometry.hpp>
- #include <boost/geometry/geometries/linestring.hpp>
- #include <boost/geometry/geometries/point_xy.hpp>
- #include <boost/geometry/geometries/polygon.hpp>
- #include <boost/geometry/geometries/adapted/c_array.hpp>
- #if defined(HAVE_SVG)
- # include <boost/geometry/io/svg/svg_mapper.hpp>
- #endif
- BOOST_GEOMETRY_REGISTER_C_ARRAY_CS(cs::cartesian);
- int main(void)
- {
- namespace bg = boost::geometry;
- typedef bg::model::d2::point_xy<double> point_2d;
- bg::model::linestring<point_2d> ls;
- {
- const double c[][2] = { {0, 1}, {2, 5}, {5, 3} };
- bg::assign_points(ls, c);
- }
- bg::model::polygon<point_2d> p;
- {
- const double c[][2] = { {3, 0}, {0, 3}, {4, 5}, {3, 0} };
- bg::assign_points(p, c);
- }
- bg::correct(p);
- #if defined(HAVE_SVG)
- // Create SVG-mapper
- std::ofstream stream("05_b_overlay_linestring_polygon_example.svg");
- bg::svg_mapper<point_2d> svg(stream, 500, 500);
- // Determine extend by adding geometries
- svg.add(p);
- svg.add(ls);
- // Map geometries
- svg.map(ls, "opacity:0.6;stroke:rgb(255,0,0);stroke-width:2;");
- svg.map(p, "opacity:0.6;fill:rgb(0,0,255);");
- #endif
- // Calculate intersection points (turn points)
- typedef bg::segment_ratio_type<point_2d, bg::detail::no_rescale_policy>::type segment_ratio;
- typedef bg::detail::overlay::turn_info<point_2d, segment_ratio> turn_info;
- std::vector<turn_info> turns;
- bg::detail::get_turns::no_interrupt_policy policy;
- bg::detail::no_rescale_policy rescale_policy;
- bg::get_turns<false, false, bg::detail::overlay::assign_null_policy>(ls, p, rescale_policy, turns, policy);
- std::cout << "Intersection of linestring/polygon" << std::endl;
- BOOST_FOREACH(turn_info const& turn, turns)
- {
- std::string action = "intersecting";
- if (turn.operations[0].operation
- == bg::detail::overlay::operation_intersection)
- {
- action = "entering";
- }
- else if (turn.operations[0].operation
- == bg::detail::overlay::operation_union)
- {
- action = "leaving";
- }
- std::cout << action << " polygon at " << bg::dsv(turn.point) << std::endl;
- #if defined(HAVE_SVG)
- svg.map(turn.point, "fill:rgb(255,128,0);stroke:rgb(0,0,100);stroke-width:1");
- svg.text(turn.point, action, "fill:rgb(0,0,0);font-family:Arial;font-size:10px");
- #endif
- }
- return 0;
- }
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