109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
/*****************************************************************************
|
|
*
|
|
* 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef MAPNIK_MARKERS_PLACEMENT_HPP
|
|
#define MAPNIK_MARKERS_PLACEMENT_HPP
|
|
|
|
#include <mapnik/markers_placements/line.hpp>
|
|
#include <mapnik/markers_placements/point.hpp>
|
|
#include <mapnik/markers_placements/interior.hpp>
|
|
#include <mapnik/markers_placements/vertext_first.hpp>
|
|
#include <mapnik/markers_placements/vertext_last.hpp>
|
|
#include <mapnik/symbolizer_enumerations.hpp>
|
|
#include <mapnik/util/variant.hpp>
|
|
|
|
namespace mapnik
|
|
{
|
|
|
|
template <typename Locator, typename Detector>
|
|
class markers_placement_finder : mapnik::noncopyable
|
|
{
|
|
public:
|
|
using markers_placement = util::variant<markers_point_placement<Locator, Detector>,
|
|
markers_line_placement<Locator, Detector>,
|
|
markers_interior_placement<Locator, Detector>,
|
|
markers_vertex_first_placement<Locator, Detector>,
|
|
markers_vertex_last_placement<Locator, Detector>>;
|
|
|
|
class get_point_visitor : public util::static_visitor<bool>
|
|
{
|
|
public:
|
|
get_point_visitor(double &x, double &y, double &angle, bool ignore_placement)
|
|
: x_(x), y_(y), angle_(angle), ignore_placement_(ignore_placement)
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator()(T &placement) const
|
|
{
|
|
return placement.get_point(x_, y_, angle_, ignore_placement_);
|
|
}
|
|
|
|
private:
|
|
double &x_, &y_, &angle_;
|
|
bool ignore_placement_;
|
|
};
|
|
|
|
markers_placement_finder(marker_placement_e placement_type,
|
|
Locator &locator,
|
|
Detector &detector,
|
|
markers_placement_params const& params)
|
|
: placement_(create(placement_type, locator, detector, params))
|
|
{
|
|
}
|
|
|
|
// Get next point where the marker should be placed. Returns true if a place is found, false if none is found.
|
|
bool get_point(double &x, double &y, double &angle, bool ignore_placement)
|
|
{
|
|
return util::apply_visitor(get_point_visitor(x, y, angle, ignore_placement), placement_);
|
|
}
|
|
|
|
private:
|
|
// Factory function for particular placement implementations.
|
|
static markers_placement create(marker_placement_e placement_type,
|
|
Locator &locator,
|
|
Detector &detector,
|
|
markers_placement_params const& params)
|
|
{
|
|
switch (placement_type)
|
|
{
|
|
case MARKER_POINT_PLACEMENT:
|
|
return markers_point_placement<Locator, Detector>(locator,detector,params);
|
|
case MARKER_INTERIOR_PLACEMENT:
|
|
return markers_interior_placement<Locator, Detector>(locator,detector,params);
|
|
case MARKER_LINE_PLACEMENT:
|
|
return markers_line_placement<Locator, Detector>(locator,detector,params);
|
|
case MARKER_VERTEX_FIRST_PLACEMENT:
|
|
return markers_vertex_first_placement<Locator, Detector>(locator,detector,params);
|
|
case MARKER_VERTEX_LAST_PLACEMENT:
|
|
return markers_vertex_last_placement<Locator, Detector>(locator,detector,params);
|
|
default: // point
|
|
return markers_point_placement<Locator, Detector>(locator,detector,params);
|
|
}
|
|
}
|
|
|
|
markers_placement placement_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif // MAPNIK_MARKERS_PLACEMENT_HPP
|