295 lines
12 KiB
C++
295 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
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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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#include <mapnik/datasource_cache.hpp>
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using mapnik::layer;
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using mapnik::parameters;
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using mapnik::datasource_cache;
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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.clear_label_cache(),l.min_zoom(),l.max_zoom(),l.queryable(),l.datasource()->params(),l.cache_features(),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) != 9)
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{
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PyErr_SetObject(PyExc_ValueError,
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("expected 9-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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l.set_clear_label_cache(extract<bool>(state[0]));
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l.set_min_zoom(extract<double>(state[1]));
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l.set_max_zoom(extract<double>(state[2]));
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l.set_queryable(extract<bool>(state[3]));
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mapnik::parameters params = extract<parameters>(state[4]);
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l.set_datasource(datasource_cache::instance()->create(params));
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boost::python::list s = extract<boost::python::list>(state[5]);
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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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l.set_cache_features(extract<bool>(state[6]));
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs'\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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\n"
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">>> lyr.envelope()\n"
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"box2d(-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::visible,
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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("active",
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&layer::active,
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&layer::set_active,
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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 to clear the label collision detector cache for this layer during rendering\n"
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"\n"
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"Usage:\n"
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">>> lyr.clear_label_cache\n"
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"False # False by default, meaning label positions from other layers will impact placement \n"
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">>> lyr.clear_label_cache = True # set to True to clear the label collision detector cache\n"
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)
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.add_property("cache_features",
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&layer::cache_features,
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&layer::set_cache_features,
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"Get/Set whether features should be cached during rendering if used between multiple styles\n"
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"\n"
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"Usage:\n"
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">>> lyr.cache_features\n"
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"False # False by default\n"
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">>> lyr.cache_features = True # set to True to enable feature caching\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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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::max_zoom,
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&layer::set_max_zoom,
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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::min_zoom,
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&layer::set_min_zoom,
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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::queryable,
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&layer::set_queryable,
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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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\n"
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">>> lyr.srs\n"
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"'+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs' # 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=longlat +ellps=WGS84 +datum=WGS84 +no_defs')\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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;
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}
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