109 lines
4.2 KiB
C++
109 lines
4.2 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) 2015 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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#ifndef MAPNIK_MARKERS_PLACEMENT_HPP
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#define MAPNIK_MARKERS_PLACEMENT_HPP
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#include <mapnik/markers_placements/line.hpp>
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#include <mapnik/markers_placements/point.hpp>
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#include <mapnik/markers_placements/interior.hpp>
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#include <mapnik/markers_placements/vertext_first.hpp>
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#include <mapnik/markers_placements/vertext_last.hpp>
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#include <mapnik/symbolizer_enumerations.hpp>
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#include <mapnik/util/variant.hpp>
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namespace mapnik
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{
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template <typename Locator, typename Detector>
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class markers_placement_finder : util::noncopyable
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{
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public:
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using markers_placement = util::variant<markers_point_placement<Locator, Detector>,
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markers_line_placement<Locator, Detector>,
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markers_interior_placement<Locator, Detector>,
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markers_vertex_first_placement<Locator, Detector>,
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markers_vertex_last_placement<Locator, Detector>>;
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class get_point_visitor
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{
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public:
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get_point_visitor(double &x, double &y, double &angle, bool ignore_placement)
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: x_(x), y_(y), angle_(angle), ignore_placement_(ignore_placement)
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{
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}
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template <typename T>
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bool operator()(T &placement) const
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{
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return placement.get_point(x_, y_, angle_, ignore_placement_);
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}
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private:
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double &x_, &y_, &angle_;
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bool ignore_placement_;
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};
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markers_placement_finder(marker_placement_e placement_type,
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Locator &locator,
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Detector &detector,
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markers_placement_params const& params)
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: placement_(create(placement_type, locator, detector, params))
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{
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}
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// Get next point where the marker should be placed. Returns true if a place is found, false if none is found.
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bool get_point(double &x, double &y, double &angle, bool ignore_placement)
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{
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return util::apply_visitor(get_point_visitor(x, y, angle, ignore_placement), placement_);
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}
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private:
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// Factory function for particular placement implementations.
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static markers_placement create(marker_placement_e placement_type,
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Locator &locator,
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Detector &detector,
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markers_placement_params const& params)
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{
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switch (placement_type)
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{
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case MARKER_POINT_PLACEMENT:
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return markers_point_placement<Locator, Detector>(locator,detector,params);
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case MARKER_INTERIOR_PLACEMENT:
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return markers_interior_placement<Locator, Detector>(locator,detector,params);
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case MARKER_LINE_PLACEMENT:
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return markers_line_placement<Locator, Detector>(locator,detector,params);
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case MARKER_VERTEX_FIRST_PLACEMENT:
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return markers_vertex_first_placement<Locator, Detector>(locator,detector,params);
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case MARKER_VERTEX_LAST_PLACEMENT:
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return markers_vertex_last_placement<Locator, Detector>(locator,detector,params);
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default: // point
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return markers_point_placement<Locator, Detector>(locator,detector,params);
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}
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}
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markers_placement placement_;
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};
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}
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#endif // MAPNIK_MARKERS_PLACEMENT_HPP
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