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1. The first allows the user to add a <FileSource
name="foo">/home/bar/baz/</FileSource> to the beginning of the file
and then in any of the symbolisers you can say:
<FooSymboliser base="foo" name="bridge">
It it will refer to the file /home/bar/baz/bridge.
2. The second allows you to create Datasource templates at the top
level, which can be used later in the actual layers like so:
<Map>
<Datasource name="db">
<Paramaeter name="host">/tmp</Parameter>
</Datasource>
<Layer name="lay">
<Datasource base="db">
<Parameter name="table">points</Parameter>
</Datasource>
</Layer>
</Map>
And the host parameter will be used in the layer.
3. The third adds the "base" parameter to the raster and shape input
plugins. All it does is specify a path to prefix to the filename prior
to using it. Together with the above feature it allows things like:
<Map>
<Datasource name="shapes">
<Paramaeter name="base">/home/foo/shapes</Parameter>
</Datasource>
<Layer name="lay">
<Datasource base="shapes">
<Parameter name="file">places</Parameter>
</Datasource>
</Layer>
</Map>
And it will use the shapefile /home/foo/shapes/places
109 lines
3.2 KiB
C++
109 lines
3.2 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
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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: raster_datasource.cc 44 2005-04-22 18:53:54Z pavlenko $
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// boost
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#include <boost/lexical_cast.hpp>
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// mapnik
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#include <mapnik/image_reader.hpp>
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#include "raster_featureset.hpp"
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#include "raster_info.hpp"
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#include "raster_datasource.hpp"
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(raster_datasource)
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using std::clog;
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using std::endl;
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using boost::lexical_cast;
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using boost::bad_lexical_cast;
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using mapnik::layer_descriptor;
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using mapnik::featureset_ptr;
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using mapnik::query;
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using mapnik::coord2d;
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using mapnik::datasource_exception;
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raster_datasource::raster_datasource(const parameters& params)
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: datasource (params),
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desc_(*params.get<std::string>("type"),"utf-8")
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{
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boost::optional<std::string> file=params.get<std::string>("file");
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boost::optional<std::string> base=params.get<std::string>("base");
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if (!file) throw datasource_exception("missing <file> parameter ");
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if (base)
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filename_ = *base + "/" + *file;
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else
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filename_ = *file;
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format_=*params.get<std::string>("format","tiff");
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boost::optional<double> lox = params.get<double>("lox");
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boost::optional<double> loy = params.get<double>("loy");
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boost::optional<double> hix = params.get<double>("hix");
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boost::optional<double> hiy = params.get<double>("hiy");
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if (lox && loy && hix && hiy)
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{
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extent_.init(*lox,*loy,*hix,*hiy);
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}
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else throw datasource_exception("<lox> <loy> <hix> <hiy> are required");
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}
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raster_datasource::~raster_datasource() {}
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int raster_datasource::type() const
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{
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return datasource::Raster;
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}
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std::string raster_datasource::name_="raster";
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std::string raster_datasource::name()
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{
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return name_;
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}
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mapnik::Envelope<double> raster_datasource::envelope() const
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{
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return extent_;
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}
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layer_descriptor raster_datasource::get_descriptor() const
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{
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return desc_;
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}
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featureset_ptr raster_datasource::features(query const& q) const
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{
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raster_info info(filename_,format_,extent_);
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single_file_policy policy(info); //todo: handle different policies!
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return featureset_ptr(new raster_featureset<single_file_policy>(policy,q));
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}
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featureset_ptr raster_datasource::features_at_point(coord2d const&) const
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{
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return featureset_ptr();
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}
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