334 lines
12 KiB
C++
334 lines
12 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, Dane Springmeyer
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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_layer.cc 17 2005-03-08 23:58:43Z pavlenko $
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// boost
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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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// mapnik
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#include <mapnik/layer.hpp>
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#include <mapnik/datasource.hpp>
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using mapnik::Layer;
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using mapnik::parameters;
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using mapnik::datasource;
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struct layer_pickle_suite : boost::python::pickle_suite
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{
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static boost::python::tuple
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getinitargs(const Layer& l)
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{
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return boost::python::make_tuple(l.name(),l.srs());
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}
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static boost::python::tuple
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getstate(const Layer& l)
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{
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boost::python::list s;
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std::vector<std::string> const& style_names = l.styles();
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for (unsigned i = 0; i < style_names.size(); ++i)
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{
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s.append(style_names[i]);
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}
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return boost::python::make_tuple(l.abstract(),l.title(),l.clear_label_cache(),l.getMinZoom(),l.getMaxZoom(),l.isQueryable(),l.datasource(),s);
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}
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static void
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setstate (Layer& l, boost::python::tuple state)
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{
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using namespace boost::python;
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if (len(state) != 8)
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{
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PyErr_SetObject(PyExc_ValueError,
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("expected 8-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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if (state[0])
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{
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l.set_abstract(extract<std::string>(state[0]));
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}
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if (state[1])
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{
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l.set_title(extract<std::string>(state[1]));
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}
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if (state[2])
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{
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l.set_clear_label_cache(extract<bool>(state[2]));
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}
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if (state[3])
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{
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l.setMinZoom(extract<double>(state[3]));
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}
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if (state[4])
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{
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l.setMaxZoom(extract<double>(state[4]));
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}
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if (state[5])
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{
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l.setQueryable(extract<bool>(state[5]));
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}
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if (state[6])
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{
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boost::shared_ptr<datasource> ds = extract<boost::shared_ptr<datasource> >(state[6]);
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l.set_datasource(ds);
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}
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boost::python::list s = extract<boost::python::list>(state[7]);
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for (int i=0;i<len(s);++i)
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{
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l.add_style(extract<std::string>(s[i]));
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}
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}
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};
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std::vector<std::string> & (mapnik::Layer::*_styles_)() = &mapnik::Layer::styles;
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void export_layer()
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{
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using namespace boost::python;
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class_<std::vector<std::string> >("Names")
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.def(vector_indexing_suite<std::vector<std::string>,true >())
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;
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class_<Layer>("Layer", "A Mapnik map layer.", init<std::string const&,optional<std::string const&> >(
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"Create a Layer with a named string and, optionally, an srs string.\n"
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"\n"
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"The srs can be either a Proj.4 epsg code ('+init=epsg:<code>') or\n"
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"of a Proj.4 literal ('+proj=<literal>').\n"
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"If no srs is specified it 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 Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr\n"
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"<mapnik._mapnik.Layer object at 0x6a270>\n"
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))
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.def_pickle(layer_pickle_suite())
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.def("envelope",&Layer::envelope,
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"Return the geographic envelope/bounding box."
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"\n"
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"Determined based on the layer datasource.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.envelope()\n"
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"Envelope(-1.0,-1.0,0.0,0.0) # default until a datasource is loaded\n"
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)
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.def("visible", &Layer::isVisible,
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"Return True if this layer's data is active and visible at a given scale.\n"
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"\n"
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"Otherwise returns False.\n"
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"Accepts a scale value as an integer or float input.\n"
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"Will return False if:\n"
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"\tscale >= minzoom - 1e-6\n"
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"\tor:\n"
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"\tscale < maxzoom + 1e-6\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.visible(1.0/1000000)\n"
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"True\n"
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">>> lyr.active = False\n"
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">>> lyr.visible(1.0/1000000)\n"
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"False\n"
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)
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.add_property("abstract",
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make_function(&Layer::abstract,return_value_policy<copy_const_reference>()),
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&Layer::set_abstract,
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"Get/Set the abstract of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.abstract\n"
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"'' # default is en empty string\n"
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">>> lyr.abstract = 'My Shapefile rendered with Mapnik'\n"
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">>> lyr.abstract\n"
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"'My Shapefile rendered with Mapnik'\n"
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)
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.add_property("active",
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&Layer::isActive,
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&Layer::setActive,
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"Get/Set whether this layer is active and will be rendered.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.active\n"
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"True # Active by default\n"
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">>> lyr.active = False # set False to disable layer rendering\n"
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">>> lyr.active\n"
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"False\n"
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)
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.add_property("clear_label_cache",
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&Layer::clear_label_cache,
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&Layer::set_clear_label_cache,
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"Get/Set whether this layer's labels are cached.\n"
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"\n"
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"Usage:\n"
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"TODO\n"
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)
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.add_property("datasource",
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&Layer::datasource,
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&Layer::set_datasource,
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"The datasource attached to this layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer, Datasource\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.datasource = Datasource(type='shape',file='world_borders')\n"
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">>> lyr.datasource\n"
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"<mapnik.Datasource object at 0x65470>\n"
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)
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.add_property("maxzoom",
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&Layer::getMaxZoom,
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&Layer::setMaxZoom,
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"Get/Set the maximum zoom lever of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.maxzoom\n"
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"1.7976931348623157e+308 # default is the numerical maximum\n"
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">>> lyr.maxzoom = 1.0/1000000\n"
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">>> lyr.maxzoom\n"
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"9.9999999999999995e-07\n"
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)
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.add_property("minzoom",
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&Layer::getMinZoom,
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&Layer::setMinZoom,
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"Get/Set the minimum zoom lever of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.minzoom # default is 0\n"
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"0.0\n"
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">>> lyr.minzoom = 1.0/1000000\n"
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">>> lyr.minzoom\n"
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"9.9999999999999995e-07\n"
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)
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.add_property("name",
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make_function(&Layer::name, return_value_policy<copy_const_reference>()),
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&Layer::set_name,
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"Get/Set the name of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.name\n"
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"'My Layer'\n"
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">>> lyr.name = 'New Name'\n"
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">>> lyr.name\n"
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"'New Name'\n"
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)
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.add_property("queryable",
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&Layer::isQueryable,
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&Layer::setQueryable,
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"Get/Set whether this layer is queryable.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.queryable\n"
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"False # Not queryable by default\n"
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">>> lyr.queryable = True\n"
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">>> lyr.queryable\n"
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"True\n"
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)
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.add_property("srs",
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make_function(&Layer::srs,return_value_policy<copy_const_reference>()),
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&Layer::set_srs,
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"Get/Set the SRS of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.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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">>> lyr.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("styles",
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make_function(_styles_,return_value_policy<reference_existing_object>()),
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"The styles list attached to this layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.styles\n"
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"<mapnik._mapnik.Names object at 0x6d3e8>\n"
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">>> len(lyr.styles)\n"
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"0\n # no styles until you append them\n"
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"lyr.styles.append('My Style') # mapnik uses named styles for flexibility\n"
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">>> len(lyr.styles)\n"
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"1\n"
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">>> lyr.styles[0]\n"
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"'My Style'\n"
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)
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.add_property("title",
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make_function(&Layer::title, return_value_policy<copy_const_reference>()),
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&Layer::set_title,
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"Get/Set the title of the layer.\n"
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"\n"
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"Usage:\n"
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">>> from mapnik import Layer\n"
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">>> lyr = Layer('My Layer','+proj=latlong +datum=WGS84')\n"
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">>> lyr.title\n"
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"''\n"
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">>> lyr.title = 'My first layer'\n"
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">>> lyr.title\n"
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"'My first layer'\n"
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)
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;
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}
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