/usr/include/mapnik/text_placements/base.hpp is in libmapnik-dev 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o644.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2012 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
*
*****************************************************************************/
#ifndef PLACEMENTS_BASE_HPP
#define PLACEMENTS_BASE_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/text_properties.hpp>
#include <mapnik/formatting/base.hpp>
namespace mapnik
{
typedef std::pair<double,double> dimension_type;
class MAPNIK_DECL text_placements;
/** Generate a possible placement and store results of placement_finder.
* This placement has first to be tested by placement_finder to verify it
* can actually be used.
*/
class MAPNIK_DECL text_placement_info : mapnik::noncopyable
{
public:
/** Constructor. Takes the parent text_placements object as a parameter
* to read defaults from it. */
text_placement_info(text_placements const* parent, double scale_factor_);
/** Get next placement.
* This function is also called before the first placement is tried.
* Each class has to return at least one position!
* If this functions returns false the placement data should be
* considered invalid!
*/
virtual bool next()=0;
virtual ~text_placement_info() {}
/** Properties actually used by placement finder and renderer. Values in
* here are modified each time next() is called. */
text_symbolizer_properties properties;
/** Scale factor used by the renderer. */
double scale_factor;
/** Set scale factor. */
void set_scale_factor(double factor) { scale_factor = factor; }
/** Get scale factor. */
double get_scale_factor() const { return scale_factor; }
/** Get label spacing taking the scale factor into account. */
double get_actual_label_spacing() const { return scale_factor * properties.label_spacing; }
/** Get minimum distance taking the scale factor into account. */
double get_actual_minimum_distance() const { return scale_factor * properties.minimum_distance; }
/** Get minimum padding taking the scale factor into account. */
double get_actual_minimum_padding() const { return scale_factor * properties.minimum_padding; }
};
typedef boost::shared_ptr<text_placement_info> text_placement_info_ptr;
/** This object handles the management of all TextSymbolizer properties. It can
* be used as a base class for own objects which implement new processing
* semantics. Basically this class just makes sure a pointer of the right
* class is returned by the get_placement_info call.
*/
class MAPNIK_DECL text_placements
{
public:
text_placements();
/** Get a text_placement_info object to use in rendering.
* The returned object creates a list of settings which is
* used to try to find a placement and stores all
* information that is generated by
* the placement finder.
*
* This function usually is implemented as
* text_placement_info_ptr text_placements_XXX::get_placement_info() const
* {
* return text_placement_info_ptr(new text_placement_info_XXX(this));
* }
*/
virtual text_placement_info_ptr get_placement_info(
double scale_factor_) const =0;
/** Get a list of all expressions used in any placement.
* This function is used to collect attributes.
*/
virtual void add_expressions(expression_set &output);
/** Destructor. */
virtual ~text_placements() {}
/** List of all properties used as the default for the subclasses. */
text_symbolizer_properties defaults;
};
/** Pointer to object of class text_placements */
typedef boost::shared_ptr<text_placements> text_placements_ptr;
} //ns mapnik
#endif // PLACEMENTS_BASE_HPP
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