83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
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/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/well_known_srs.hpp>
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#include <mapnik/util/trim.hpp>
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// boost
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#include <boost/optional.hpp>
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namespace mapnik {
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static const char * well_known_srs_strings[] = {
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"mapnik-longlat",
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"mapnik-gmerc",
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""
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};
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boost::optional<well_known_srs_e> is_well_known_srs(std::string const& srs)
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{
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if (srs == "+init=epsg:4326" || srs == MAPNIK_LONGLAT_PROJ)
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{
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return boost::optional<well_known_srs_e>(mapnik::WGS_84);
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}
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else if (srs == "+init=epsg:3857" || srs == MAPNIK_GMERC_PROJ)
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{
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return boost::optional<well_known_srs_e>(mapnik::G_MERC);
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}
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return boost::optional<well_known_srs_e>();
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}
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boost::optional<bool> is_known_geographic(std::string const& srs)
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{
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std::string trimmed = util::trim_copy(srs);
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if (trimmed == "+init=epsg:3857")
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{
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return boost::optional<bool>(false);
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}
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else if (trimmed == "+init=epsg:4326")
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{
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return boost::optional<bool>(true);
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}
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else if (srs.find("+proj=") != std::string::npos)
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{
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if ((srs.find("+proj=longlat") != std::string::npos) ||
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(srs.find("+proj=latlong") != std::string::npos) ||
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(srs.find("+proj=lonlat") != std::string::npos) ||
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(srs.find("+proj=latlon") != std::string::npos)
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)
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{
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return boost::optional<bool>(true);
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}
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else
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{
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return boost::optional<bool>(false);
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}
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}
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return boost::optional<bool>();
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}
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IMPLEMENT_ENUM( well_known_srs_e, well_known_srs_strings )
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}
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