119 lines
4 KiB
C++
119 lines
4 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) 2006 Artem Pavlenko, Jean-Francois Doyon
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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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//$Id$
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//boost
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#include <boost/python.hpp>
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// mapnik
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#include <mapnik/coord.hpp>
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#include <mapnik/projection.hpp>
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using mapnik::projection;
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struct projection_pickle_suite : boost::python::pickle_suite
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{
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static boost::python::tuple
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getinitargs(const projection& p)
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{
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using namespace boost::python;
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return boost::python::make_tuple(p.params());
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}
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};
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namespace {
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mapnik::coord2d forward_pt(mapnik::coord2d const& pt,
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mapnik::projection const& prj)
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{
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double x = pt.x;
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double y = pt.y;
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prj.forward(x,y);
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return mapnik::coord2d(x,y);
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}
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mapnik::coord2d inverse_pt(mapnik::coord2d const& pt,
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mapnik::projection const& prj)
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{
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double x = pt.x;
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double y = pt.y;
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prj.inverse(x,y);
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return mapnik::coord2d(x,y);
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}
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mapnik::box2d<double> forward_env(mapnik::box2d<double> const & box,
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mapnik::projection const& prj)
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{
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double minx = box.minx();
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double miny = box.miny();
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double maxx = box.maxx();
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double maxy = box.maxy();
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prj.forward(minx,miny);
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prj.forward(maxx,maxy);
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return mapnik::box2d<double>(minx,miny,maxx,maxy);
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}
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mapnik::box2d<double> inverse_env(mapnik::box2d<double> const & box,
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mapnik::projection const& prj)
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{
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double minx = box.minx();
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double miny = box.miny();
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double maxx = box.maxx();
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double maxy = box.maxy();
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prj.inverse(minx,miny);
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prj.inverse(maxx,maxy);
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return mapnik::box2d<double>(minx,miny,maxx,maxy);
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}
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}
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void export_projection ()
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{
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using namespace boost::python;
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class_<projection>("Projection", "Represents a map projection.",init<optional<std::string const&> >(
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(arg("proj4_string")),
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"Constructs a new projection from its PROJ.4 string representation.\n"
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"\n"
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"The parameterless version of this constructor is equivalent to\n"
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" Projection('+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\n"
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"\n"
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"The constructor will throw a RuntimeError in case the projection\n"
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"cannot be initialized.\n"
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)
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)
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.def_pickle(projection_pickle_suite())
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.def ("params", make_function(&projection::params,
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return_value_policy<copy_const_reference>()),
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"Returns the PROJ.4 string for this projection.\n")
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.def ("expanded",&projection::expanded,
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"normalize PROJ.4 definition by expanding +init= syntax\n")
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.add_property ("geographic", &projection::is_geographic,
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"This property is True if the projection is a geographic projection\n"
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"(i.e. it uses lon/lat coordinates)\n")
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;
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def("forward_",&forward_pt);
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def("inverse_",&inverse_pt);
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def("forward_",&forward_env);
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def("inverse_",&inverse_env);
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}
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