mapnik/src/metawriter_inmem.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2011 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

// Mapnik
#include <mapnik/metawriter.hpp>
#include <mapnik/metawriter_inmem.hpp>
#include <mapnik/text_placements/base.hpp>

// Boost
#include <boost/foreach.hpp>

using std::map;
using std::string;

namespace {

using mapnik::value;
using mapnik::Feature;
using mapnik::metawriter_properties;

// intersect a set of properties with those in the feature descriptor
map<string,value> intersect_properties(Feature const& feature, metawriter_properties const& properties) {

    map<string,value> nprops;
    BOOST_FOREACH(string p, properties)
    {
        if (feature.has_key(p))
            nprops.insert(std::make_pair(p,feature.get(p)));
    }

    return nprops;
}} // end anonymous namespace

namespace mapnik {

metawriter_inmem::metawriter_inmem(metawriter_properties dflt_properties)
    : metawriter(dflt_properties) {
}

metawriter_inmem::~metawriter_inmem() {
}

void
metawriter_inmem::add_box(box2d<double> const& box, Feature const& feature,
                          CoordTransform const& /*t*/,
                          metawriter_properties const& properties) {
    meta_instance inst;
    inst.box = box;
    inst.properties = intersect_properties(feature, properties);
    instances_.push_back(inst);
}

void
metawriter_inmem::add_text(text_placement_info const& p,
                           face_manager_freetype & /*face*/,
                           Feature const& feature,
                           CoordTransform const& /*t*/,
                           metawriter_properties const& properties) {
    if (p.extents.valid()) {
        meta_instance inst;
        inst.properties = intersect_properties(feature, properties);
        inst.box = p.extents;
        instances_.push_back(inst);
    }
}

void
metawriter_inmem::add_polygon(path_type & path,
                              Feature const& feature,
                              CoordTransform const& t,
                              metawriter_properties const& properties) {
    add_vertices(path, feature, t, properties);
}

void
metawriter_inmem::add_line(path_type & path,
                           Feature const& feature,
                           CoordTransform const& t,
                           metawriter_properties const& properties) {
    add_vertices(path, feature, t, properties);
}

void
metawriter_inmem::add_vertices(path_type & path,
                               Feature const& feature,
                               CoordTransform const& /*t*/,
                               metawriter_properties const& properties) {
    box2d<double> box;
    unsigned cmd;
    double x = 0.0, y = 0.0;

    path.rewind(0);
    while ((cmd = path.vertex(&x, &y)) != SEG_END) {
        box.expand_to_include(x, y);
    }

    if ((box.width() >= 0.0) && (box.height() >= 0.0)) {
        meta_instance inst;
        inst.properties = intersect_properties(feature, properties);
        inst.box = box;
        instances_.push_back(inst);
    }
}

void
metawriter_inmem::start(metawriter_property_map const& /*properties*/) {
    instances_.clear();
}

const std::list<metawriter_inmem::meta_instance> &
metawriter_inmem::instances() const {
    return instances_;
}

metawriter_inmem::meta_instance_list::const_iterator
metawriter_inmem::inst_begin() const {
    return instances_.begin();
}

metawriter_inmem::meta_instance_list::const_iterator
metawriter_inmem::inst_end() const {
    return instances_.end();
}


}