419 lines
12 KiB
C++
419 lines
12 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2009-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2016.
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// Modifications copyright (c) 2016, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_IO_SVG_WRITE_HPP
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#define BOOST_GEOMETRY_IO_SVG_WRITE_HPP
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#include <ostream>
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#include <string>
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#include <boost/config.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/range.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
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#include <boost/geometry/core/exterior_ring.hpp>
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#include <boost/geometry/core/interior_rings.hpp>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace svg
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{
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template <typename Point>
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struct svg_point
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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Point const& p, std::string const& style, double size)
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{
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os << "<circle cx=\"" << geometry::get<0>(p)
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<< "\" cy=\"" << geometry::get<1>(p)
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<< "\" r=\"" << (size < 0 ? 5 : size)
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<< "\" style=\"" << style << "\"/>";
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}
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};
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template <typename Box>
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struct svg_box
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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Box const& box, std::string const& style, double)
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{
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// Prevent invisible boxes, making them >=1, using "max"
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BOOST_USING_STD_MAX();
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typedef typename coordinate_type<Box>::type ct;
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ct x = geometry::get<geometry::min_corner, 0>(box);
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ct y = geometry::get<geometry::min_corner, 1>(box);
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ct width = max BOOST_PREVENT_MACRO_SUBSTITUTION (ct(1),
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geometry::get<geometry::max_corner, 0>(box) - x);
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ct height = max BOOST_PREVENT_MACRO_SUBSTITUTION (ct(1),
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geometry::get<geometry::max_corner, 1>(box) - y);
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os << "<rect x=\"" << x << "\" y=\"" << y
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<< "\" width=\"" << width << "\" height=\"" << height
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<< "\" style=\"" << style << "\"/>";
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}
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};
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template <typename Segment>
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struct svg_segment
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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Segment const& segment, std::string const& style, double)
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{
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typedef typename coordinate_type<Segment>::type ct;
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ct x1 = geometry::get<0, 0>(segment);
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ct y1 = geometry::get<0, 1>(segment);
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ct x2 = geometry::get<1, 0>(segment);
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ct y2 = geometry::get<1, 1>(segment);
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os << "<line x1=\"" << x1 << "\" y1=\"" << y1
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<< "\" x2=\"" << x2 << "\" y2=\"" << y2
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<< "\" style=\"" << style << "\"/>";
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}
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};
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/*!
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\brief Stream ranges as SVG
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\note policy is used to select type (polyline/polygon)
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*/
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template <typename Range, typename Policy>
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struct svg_range
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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Range const& range, std::string const& style, double)
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{
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typedef typename boost::range_iterator<Range const>::type iterator;
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bool first = true;
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os << "<" << Policy::prefix() << " points=\"";
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for (iterator it = boost::begin(range);
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it != boost::end(range);
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++it, first = false)
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{
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os << (first ? "" : " " )
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<< geometry::get<0>(*it)
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<< ","
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<< geometry::get<1>(*it);
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}
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os << "\" style=\"" << style << Policy::style() << "\"/>";
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}
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};
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template <typename Polygon>
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struct svg_poly
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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Polygon const& polygon, std::string const& style, double)
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{
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typedef typename geometry::ring_type<Polygon>::type ring_type;
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typedef typename boost::range_iterator<ring_type const>::type iterator_type;
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bool first = true;
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os << "<g fill-rule=\"evenodd\"><path d=\"";
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ring_type const& ring = geometry::exterior_ring(polygon);
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for (iterator_type it = boost::begin(ring);
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it != boost::end(ring);
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++it, first = false)
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{
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os << (first ? "M" : " L") << " "
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<< geometry::get<0>(*it)
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<< ","
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<< geometry::get<1>(*it);
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}
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// Inner rings:
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{
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typename interior_return_type<Polygon const>::type
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rings = interior_rings(polygon);
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for (typename detail::interior_iterator<Polygon const>::type
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rit = boost::begin(rings); rit != boost::end(rings); ++rit)
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{
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first = true;
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for (typename detail::interior_ring_iterator<Polygon const>::type
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it = boost::begin(*rit); it != boost::end(*rit);
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++it, first = false)
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{
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os << (first ? "M" : " L") << " "
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<< geometry::get<0>(*it)
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<< ","
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<< geometry::get<1>(*it);
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}
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}
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}
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os << " z \" style=\"" << style << "\"/></g>";
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}
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};
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struct prefix_linestring
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{
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static inline const char* prefix() { return "polyline"; }
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static inline const char* style() { return ";fill:none"; }
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};
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struct prefix_ring
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{
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static inline const char* prefix() { return "polygon"; }
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static inline const char* style() { return ""; }
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};
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template <typename MultiGeometry, typename Policy>
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struct svg_multi
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{
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os,
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MultiGeometry const& multi, std::string const& style, double size)
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{
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for (typename boost::range_iterator<MultiGeometry const>::type
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it = boost::begin(multi);
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it != boost::end(multi);
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++it)
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{
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Policy::apply(os, *it, style, size);
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}
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}
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};
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}} // namespace detail::svg
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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/*!
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\brief Dispatching base struct for SVG streaming, specialized below per geometry type
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\details Specializations should implement a static method "stream" to stream a geometry
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The static method should have the signature:
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template <typename Char, typename Traits>
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static inline void apply(std::basic_ostream<Char, Traits>& os, G const& geometry)
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*/
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template <typename Geometry, typename Tag = typename tag<Geometry>::type>
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struct svg
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{
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BOOST_MPL_ASSERT_MSG
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(
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false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
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, (Geometry)
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);
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};
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template <typename Point>
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struct svg<Point, point_tag> : detail::svg::svg_point<Point> {};
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template <typename Segment>
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struct svg<Segment, segment_tag> : detail::svg::svg_segment<Segment> {};
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template <typename Box>
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struct svg<Box, box_tag> : detail::svg::svg_box<Box> {};
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template <typename Linestring>
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struct svg<Linestring, linestring_tag>
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: detail::svg::svg_range<Linestring, detail::svg::prefix_linestring> {};
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template <typename Ring>
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struct svg<Ring, ring_tag>
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: detail::svg::svg_range<Ring, detail::svg::prefix_ring> {};
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template <typename Polygon>
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struct svg<Polygon, polygon_tag>
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: detail::svg::svg_poly<Polygon> {};
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template <typename MultiPoint>
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struct svg<MultiPoint, multi_point_tag>
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: detail::svg::svg_multi
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<
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MultiPoint,
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detail::svg::svg_point
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<
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typename boost::range_value<MultiPoint>::type
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>
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>
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{};
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template <typename MultiLinestring>
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struct svg<MultiLinestring, multi_linestring_tag>
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: detail::svg::svg_multi
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<
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MultiLinestring,
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detail::svg::svg_range
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<
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typename boost::range_value<MultiLinestring>::type,
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detail::svg::prefix_linestring
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>
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>
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{};
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template <typename MultiPolygon>
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struct svg<MultiPolygon, multi_polygon_tag>
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: detail::svg::svg_multi
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<
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MultiPolygon,
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detail::svg::svg_poly
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<
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typename boost::range_value<MultiPolygon>::type
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>
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>
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{};
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template <typename Geometry>
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struct devarianted_svg
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{
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template <typename OutputStream>
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static inline void apply(OutputStream& os,
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Geometry const& geometry,
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std::string const& style,
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double size)
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{
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svg<Geometry>::apply(os, geometry, style, size);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct devarianted_svg<variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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template <typename OutputStream>
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struct visitor: static_visitor<void>
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{
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OutputStream& m_os;
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std::string const& m_style;
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double m_size;
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visitor(OutputStream& os, std::string const& style, double size)
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: m_os(os)
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, m_style(style)
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, m_size(size)
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{}
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template <typename Geometry>
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inline void operator()(Geometry const& geometry) const
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{
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devarianted_svg<Geometry>::apply(m_os, geometry, m_style, m_size);
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}
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};
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template <typename OutputStream>
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static inline void apply(
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OutputStream& os,
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variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
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std::string const& style,
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double size
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)
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{
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boost::apply_visitor(visitor<OutputStream>(os, style, size), geometry);
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}
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};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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/*!
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\brief Generic geometry template manipulator class, takes corresponding output class from traits class
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\ingroup svg
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\details Stream manipulator, streams geometry classes as SVG (Scalable Vector Graphics)
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*/
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template <typename Geometry>
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class svg_manipulator
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{
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public:
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inline svg_manipulator(Geometry const& g, std::string const& style, double size)
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: m_geometry(g)
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, m_style(style)
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, m_size(size)
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{}
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template <typename Char, typename Traits>
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inline friend std::basic_ostream<Char, Traits>& operator<<(
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std::basic_ostream<Char, Traits>& os, svg_manipulator const& m)
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{
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dispatch::devarianted_svg<Geometry>::apply(os,
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m.m_geometry,
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m.m_style,
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m.m_size);
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os.flush();
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return os;
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}
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private:
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Geometry const& m_geometry;
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std::string const& m_style;
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double m_size;
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};
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/*!
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\brief Manipulator to stream geometries as SVG
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry
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\param style String containing verbatim SVG style information
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\param size Optional size (used for SVG points) in SVG pixels. For linestrings,
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specify linewidth in the SVG style information
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\ingroup svg
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*/
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template <typename Geometry>
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inline svg_manipulator<Geometry> svg(Geometry const& geometry,
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std::string const& style, double size = -1.0)
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{
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concepts::check<Geometry const>();
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return svg_manipulator<Geometry>(geometry, style, size);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_IO_SVG_WRITE_HPP
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