162 lines
3.7 KiB
C++
162 lines
3.7 KiB
C++
/*****************************************************************************
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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/projection.hpp>
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#include <mapnik/utils.hpp>
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#include <mapnik/util/trim.hpp>
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// proj4
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#include <proj_api.h>
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namespace mapnik {
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#if defined(MAPNIK_THREADSAFE) && PJ_VERSION < 480
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#warning mapnik is building against < proj 4.8, reprojection will be faster if you use >= 4.8
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boost::mutex projection::mutex_;
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#endif
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projection::projection(std::string const& params)
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: params_(params)
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{
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init();
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}
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projection::projection(projection const& rhs)
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: params_(rhs.params_)
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{
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init();
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}
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projection& projection::operator=(projection const& rhs)
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{
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projection tmp(rhs);
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swap(tmp);
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return *this;
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}
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bool projection::operator==(const projection& other) const
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{
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return (params_ == other.params_);
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}
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bool projection::operator!=(const projection& other) const
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{
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return !(*this == other);
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}
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bool projection::is_initialized() const
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{
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return proj_ ? true : false;
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}
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bool projection::is_geographic() const
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{
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return is_geographic_;
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}
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std::string const& projection::params() const
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{
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return params_;
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}
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void projection::forward(double & x, double &y ) const
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{
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#if defined(MAPNIK_THREADSAFE) && PJ_VERSION < 480
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mutex::scoped_lock lock(mutex_);
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#endif
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projUV p;
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p.u = x * DEG_TO_RAD;
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p.v = y * DEG_TO_RAD;
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p = pj_fwd(p,proj_);
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x = p.u;
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y = p.v;
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if (is_geographic_)
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{
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x *=RAD_TO_DEG;
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y *=RAD_TO_DEG;
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}
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}
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void projection::inverse(double & x,double & y) const
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{
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#if defined(MAPNIK_THREADSAFE) && PJ_VERSION < 480
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mutex::scoped_lock lock(mutex_);
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#endif
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if (is_geographic_)
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{
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x *=DEG_TO_RAD;
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y *=DEG_TO_RAD;
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}
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projUV p;
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p.u = x;
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p.v = y;
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p = pj_inv(p,proj_);
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x = RAD_TO_DEG * p.u;
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y = RAD_TO_DEG * p.v;
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}
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projection::~projection()
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{
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#if defined(MAPNIK_THREADSAFE) && PJ_VERSION < 480
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mutex::scoped_lock lock(mutex_);
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#endif
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if (proj_) pj_free(proj_);
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#if PJ_VERSION >= 480
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if (proj_ctx_) pj_ctx_free(proj_ctx_);
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#endif
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}
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void projection::init()
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{
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#if defined(MAPNIK_THREADSAFE) && PJ_VERSION < 480
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mutex::scoped_lock lock(mutex_);
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#endif
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#if PJ_VERSION >= 480
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proj_ctx_ = pj_ctx_alloc();
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proj_ = pj_init_plus_ctx(proj_ctx_, params_.c_str());
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if (!proj_)
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{
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if (proj_ctx_) pj_ctx_free(proj_ctx_);
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throw proj_init_error(params_);
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}
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#else
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proj_ = pj_init_plus(params_.c_str());
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if (!proj_) throw proj_init_error(params_);
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#endif
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is_geographic_ = pj_is_latlong(proj_) ? true : false;
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}
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std::string projection::expanded() const
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{
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if (proj_) {
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return mapnik::util::trim_copy(pj_get_def( proj_, 0 ));
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}
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return std::string("");
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}
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void projection::swap(projection& rhs)
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{
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std::swap(params_,rhs.params_);
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init();
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}
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}
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