376 lines
13 KiB
C++
376 lines
13 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: mapnik_map.cc 17 2005-03-08 23:58:43Z pavlenko $
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#include <boost/python.hpp>
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#include <boost/python/detail/api_placeholder.hpp>
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#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
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#include <mapnik/layer.hpp>
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#include <mapnik/map.hpp>
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#include "python_optional.hpp"
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using mapnik::color;
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using mapnik::coord;
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using mapnik::Envelope;
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using mapnik::Layer;
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using mapnik::Map;
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struct map_pickle_suite : boost::python::pickle_suite
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{
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static boost::python::tuple
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getinitargs(const Map& m)
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{
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return boost::python::make_tuple(m.getWidth(),m.getHeight(),m.srs());
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}
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static boost::python::tuple
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getstate(const Map& m)
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{
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boost::python::list l;
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for (unsigned i=0;i<m.layerCount();++i)
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{
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l.append(m.getLayer(i));
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}
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return boost::python::make_tuple(m.getCurrentExtent(),m.background(),l);
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}
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static void
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setstate (Map& m, boost::python::tuple state)
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{
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using namespace boost::python;
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if (len(state) != 3)
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{
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PyErr_SetObject(PyExc_ValueError,
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("expected 3-item tuple in call to __setstate__; got %s"
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% state).ptr()
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);
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throw_error_already_set();
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}
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Envelope<double> ext = extract<Envelope<double> >(state[0]);
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color bg = extract<color>(state[1]);
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m.zoomToBox(ext);
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m.set_background(bg);
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boost::python::list l=extract<boost::python::list>(state[2]);
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for (int i=0;i<len(l);++i)
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{
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m.addLayer(extract<Layer>(l[i]));
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}
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}
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};
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std::vector<Layer>& (Map::*layers_nonconst)() = &Map::layers;
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std::vector<Layer> const& (Map::*layers_const)() const = &Map::layers;
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mapnik::feature_type_style find_style (mapnik::Map const& m, std::string const& name)
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{
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boost::optional<mapnik::feature_type_style const&> style = m.find_style(name);
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if (!style)
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{
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PyErr_SetString(PyExc_KeyError, "Invalid style name");
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boost::python::throw_error_already_set();
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}
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return *style;
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}
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void export_map()
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{
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using namespace boost::python;
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python_optional<mapnik::color> ();
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class_<std::vector<Layer> >("Layers")
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.def(vector_indexing_suite<std::vector<Layer> >())
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;
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class_<Map>("Map","The map object.",init<int,int,optional<std::string const&> >(
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"Create a Map with a width and height as integers and, optionally,\n"
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"an srs string either with a Proj.4 epsg code ('+init=epsg:<code>')\n"
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"or with a Proj.4 literal ('+proj=<literal>').\n"
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"If no srs is specified the map will default to '+proj=latlong +datum=WGS84'\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Map\n"
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">>> m = Map(600,400)\n"
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">>> m\n"
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"<mapnik._mapnik.Map object at 0x6a240>\n"
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">>> m.srs\n"
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"'+proj=latlong +datum=WGS84'\n"
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))
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.def_pickle(map_pickle_suite()
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)
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.def("append_style",&Map::insert_style,
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"Insert a Mapnik Style onto the map by appending it.\n"
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"\n"
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"Usage:\n"
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">>> sty\n"
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"<mapnik._mapnik.Style object at 0x6a330>\n"
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">>> m.append_style('Style Name', sty)\n"
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"True # style object added to map by name\n"
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">>> m.append_style('Style Name', sty)\n"
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"False # you can only append styles with unique names\n"
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)
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.def("envelope",
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make_function(&Map::getCurrentExtent,
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return_value_policy<copy_const_reference>()),
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"Return the Map Envelope object\n"
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"and print the string representation\n"
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"of the current extent of the map.\n"
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"\n"
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"Usage:\n"
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">>> m.envelope()\n"
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"Envelope(-0.185833333333,-0.96,0.189166666667,-0.71)\n"
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">>> dir(m.envelope())\n"
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"...'center', 'contains', 'expand_to_include', 'forward',\n"
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"...'height', 'intersect', 'intersects', 'inverse', 'maxx',\n"
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"...'maxy', 'minx', 'miny', 'width'\n"
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)
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.def("buffered_envelope",
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&Map::get_buffered_extent,
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"TODO\n"
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)
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.def("find_style",
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find_style,
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"Query the Map for a style by name and return\n"
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"a style object if found or raise KeyError\n"
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"style if not found.\n"
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"\n"
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"Usage:\n"
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">>> m.find_style('Style Name')\n"
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"<mapnik._mapnik.Style object at 0x654f0>\n"
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)
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.def("pan",&Map::pan,
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"Set the Map center at a given x,y location\n"
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"as integers in the coordinates of the pixmap or map surface.\n"
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"\n"
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"Usage:\n"
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">>> m = Map(600,400)\n"
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">>> m.envelope().center()\n"
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"Coord(-0.5,-0.5) # default Map center\n"
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">>> m.pan(-1,-1)\n"
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">>> m.envelope().center()\n"
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"Coord(0.00166666666667,-0.835)\n"
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)
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.def("pan_and_zoom",&Map::pan_and_zoom,
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"Set the Map center at a given x,y location\n"
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"and zoom factor as a float.\n"
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"\n"
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"Usage:\n"
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">>> m = Map(600,400)\n"
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">>> m.envelope().center()\n"
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"Coord(-0.5,-0.5) # default Map center\n"
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">>> m.scale()\n"
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"-0.0016666666666666668\n"
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">>> m.pan_and_zoom(-1,-1,0.25)\n"
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">>> m.scale()\n"
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"0.00062500000000000001\n"
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)
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.def("query_map_point",&Map::query_map_point,
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"Query a Map Layer (by layer index) for features \n"
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"intersecting the given x,y location in the coordinates\n"
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"of the pixmap or map surface.\n"
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"Will return a Mapnik Featureset if successful\n"
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"otherwise will return None.\n"
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"\n"
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"Usage:\n"
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">>> feat = m.query_map_point(0,200,200)\n"
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">>> feat\n"
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">>> <mapnik._mapnik.Featureset object at 0x5fe1f0>\n"
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">>> feat.next()\n"
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">>> <mapnik._mapnik.Feature object at 0x5fe230>\n"
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)
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.def("query_point",&Map::query_point,
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"Query a Map Layer (by layer index) for features \n"
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"intersecting the given x,y location in the coordinates\n"
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"of map projection.\n"
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"Will return a Mapnik Featureset if successful\n"
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"otherwise will return None.\n"
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"\n"
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"Usage:\n"
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">>> feat = m.query_point(0,-122,48)\n"
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">>> feat\n"
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">>> <mapnik._mapnik.Featureset object at 0x5fe130>\n"
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">>> feat.next()\n"
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">>> <mapnik._mapnik.Feature object at 0x5fe1b0>\n"
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)
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.def("remove_all",&Map::remove_all,
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"Remove all Mapnik Styles and Layers from the Map.\n"
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"\n"
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"Usage:\n"
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">>> m.remove_all()\n"
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)
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.def("remove_style",&Map::remove_style,
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"Remove a Mapnik Style from the map.\n"
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"\n"
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"Usage:\n"
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">>> m.remove_style('Style Name')\n"
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)
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.def("resize",&Map::resize,
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"Resize a Mapnik Map.\n"
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"\n"
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"Usage:\n"
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">>> m.resize(64,64)\n"
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)
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.def("scale", &Map::scale,
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"Return the Map Scale.\n"
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"Usage:\n"
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"\n"
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">>> m.scale()\n"
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)
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.def("zoom",&Map::zoom,
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"Zoom in by a given factor.\n"
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"Usage:\n"
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"\n"
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">>> m.zoom(0.25)\n"
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)
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.def("zoom_all",&Map::zoom_all,
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"Set the geographical extent of the map\n"
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"to the combined extents of all active layers.\n"
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"\n"
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"Usage:\n"
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">>> m.zoom_all()\n"
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)
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.def("zoom_to_box",&Map::zoomToBox,
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"Set the geographical extent of the map\n"
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"by specifying a Mapnik Envelope.\n"
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"\n"
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"Usage:\n"
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">>> extext = Envelope(-180.0, -90.0, 180.0, 90.0)\n"
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">>> m.zoom_to_box(extent)\n"
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)
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.add_property("background",make_function
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(&Map::background,return_value_policy<copy_const_reference>()),
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&Map::set_background,
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"The background color of the map.\n"
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"\n"
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"Usage:\n"
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">>> m.background = Color('steelblue')\n"
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)
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.add_property("buffer_size",
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&Map::buffer_size,
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&Map::set_buffer_size,
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"Get/Set the size of buffer around map in pixels.\n"
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"\n"
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"Usage:\n"
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">>> m.buffer_size\n"
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"0 # zero by default\n"
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">>> m.buffer_size = 2\n"
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">>> m.buffer_size\n"
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"2\n"
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)
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.def("view_transform",&Map::view_transform,
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"Map CoordinateTransform object.\n"
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"\n"
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"Usage:\n"
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">>> m.view_transform()\n"
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)
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.add_property("height",
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&Map::getHeight,
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&Map::setHeight,
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"Get/Set the height of the map in pixels.\n"
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"Minimum settable size is 16 pixels.\n"
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"\n"
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"Usage:\n"
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">>> m.height\n"
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"400\n"
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">>> m.height = 600\n"
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">>> m.height\n"
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"600\n"
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)
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.add_property("layers",make_function
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(layers_nonconst,return_value_policy<reference_existing_object>()),
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"The list of map layers.\n"
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"\n"
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"Usage:\n"
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">>> m.layers\n"
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"<mapnik._mapnik.Layers object at 0x6d458>"
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">>> m.layers[0]\n"
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"<mapnik._mapnik.Layer object at 0x5fe130>\n"
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)
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.add_property("scale_denominator", &Map::scale_denominator,
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"Return the Map Scale Denominator.\n"
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"Usage:\n"
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"\n"
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">>> m.scale_denominator\n"
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)
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.add_property("srs",
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make_function(&Map::srs,return_value_policy<copy_const_reference>()),
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&Map::set_srs,
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"Spatial reference in Proj.4 format.\n"
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"Either an epsg code or proj literal.\n"
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"For example, a proj literal:\n"
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"\t'+proj=latlong +datum=WGS84'\n"
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"and a proj epsg code:\n"
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"\t'+init=epsg:4326'\n"
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"\n"
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"Note: using epsg codes requires the installation of\n"
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"the Proj.4 'epsg' data file normally found in '/usr/local/share/proj'\n"
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"\n"
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"Usage:\n"
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">>> m.srs\n"
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"'+proj=latlong +datum=WGS84' # The default srs if not initialized with custom srs\n"
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">>> # set to google mercator with Proj.4 literal\n"
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"... \n"
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">>> m.srs = '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over'\n"
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)
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.add_property("width",
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&Map::getWidth,
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&Map::setWidth,
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"Get/Set the width of the map in pixels.\n"
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"Minimum settable size is 16 pixels.\n"
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"\n"
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"Usage:\n"
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">>> m.width\n"
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"600\n"
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">>> m.width = 800\n"
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">>> m.width\n"
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"800\n"
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)
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;
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}
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