/usr/include/mapnik/metawriter_inmem.hpp is in libmapnik2-dev 2.0.0+ds1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | /*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 MapQuest
*
* 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
*
*****************************************************************************/
#ifndef METAWRITER_INMEM_HPP
#define METAWRITER_INMEM_HPP
// mapnik
#include <mapnik/metawriter.hpp>
// boost
#include <boost/shared_ptr.hpp>
// stl
#include <list>
namespace mapnik {
/**
* Keeps metadata information in-memory, where it can be retrieved by whatever's
* calling Mapnik and custom output provided.
*
* Stored data is all in image coordinates in the current implementation.
*
* This is most useful when Mapnik is being called from Python, and the result
* of the metawriter can be queried and injected into the (meta)tile or whatever
* in a very flexible way. E.g: for a GUI app the metawriter can be used to
* create hit areas, for a web app it could be used to create an HTML image map.
*
* Because this is kept in-memory, applying this metawriter to features which are
* very common in the rendered image will increase memory usage, especially if
* many attributes are also kept.
*/
class metawriter_inmem
: public metawriter, private boost::noncopyable {
public:
/**
* Construct an in-memory writer which keeps properties specified by the
* dflt_properties argument. For example: if dflt_properties contains "name",
* then the name attribute of rendered features referencing this metawriter
* will be kept in memory.
*/
metawriter_inmem(metawriter_properties dflt_properties);
~metawriter_inmem();
virtual void add_box(box2d<double> const& box, Feature const& feature,
CoordTransform const& t,
metawriter_properties const& properties);
virtual void add_text(placement const& p,
face_set_ptr face,
Feature const& feature,
CoordTransform const& t,
metawriter_properties const& properties);
virtual void add_polygon(path_type & path,
Feature const& feature,
CoordTransform const& t,
metawriter_properties const& properties);
virtual void add_line(path_type & path,
Feature const& feature,
CoordTransform const& t,
metawriter_properties const& properties);
virtual void start(metawriter_property_map const& properties);
/**
* An instance of a rendered feature. The box represents the image
* coordinates of a bounding box around the feature. The properties
* are the intersection of the features' properties and the "kept"
* properties of the metawriter.
*/
struct meta_instance {
box2d<double> box;
std::map<std::string, value> properties;
};
typedef std::list<meta_instance> meta_instance_list;
// const-only access to the instances.
const meta_instance_list &instances() const;
// utility iterators for use in the python bindings.
meta_instance_list::const_iterator inst_begin() const;
meta_instance_list::const_iterator inst_end() const;
private:
std::list<meta_instance> instances_;
void add_vertices(path_type & path,
Feature const& feature,
CoordTransform const& t,
metawriter_properties const& properties);
};
/** Shared pointer to metawriter_inmem object. */
typedef boost::shared_ptr<metawriter_inmem> metawriter_inmem_ptr;
}
#endif /* METAWRITER_INMEM_HPP */
|