94 lines
3.5 KiB
C++
94 lines
3.5 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) 2011 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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// mapnik
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#include <mapnik/box2d.hpp>
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// boost
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#include <boost/utility.hpp>
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// agg
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#include "agg_conv_transform.h"
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namespace mapnik {
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template <typename Locator, typename Detector>
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class markers_placement : boost::noncopyable
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{
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public:
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/** Constructor for markers_placement object.
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* \param locator Path along which markers are placed (type: vertex source)
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* \param size Size of the marker
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* \param tr Affine transform
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* \param detector Collision detection
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* \param spacing Distance between markers. If the value is negative it is
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* converted to a positive value with similar magnitude, but
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* choosen to optimize marker placement. 0 = no markers
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*/
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markers_placement(Locator &locator, box2d<double> const& size, agg::trans_affine const& tr, Detector &detector, double spacing, double max_error, bool allow_overlap);
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/** Start again at first marker.
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* \note Returns the same list of markers only works when they were NOT added
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* to the detector.
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*/
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void rewind();
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/** Get a point where the marker should be placed.
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* Each time this function is called a new point is returned.
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* \param x Return value for x position
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* \param y Return value for x position
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* \param angle Return value for rotation angle
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* \param add_to_detector Add selected position to detector
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* \return True if a place is found, false if none is found.
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*/
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bool get_point(double & x, double & y, double & angle, bool add_to_detector = true);
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private:
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Locator &locator_;
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box2d<double> const& size_;
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agg::trans_affine tr_;
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Detector &detector_;
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double spacing_;
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double marker_width_;
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double max_error_;
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bool allow_overlap_;
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bool done_;
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double last_x, last_y;
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double next_x, next_y;
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/** If a marker could not be placed at the exact point where it should
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* go the next marker's distance will be a bit lower. */
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double error_;
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double spacing_left_;
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unsigned marker_nr_;
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/** Rotates the size_ box and translates the position. */
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box2d<double> perform_transform(double angle, double dx, double dy);
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/** Automatically chooses spacing. */
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double find_optimal_spacing(double s);
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/** Set spacing_left_, adjusts error_ and performs sanity checks. */
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void set_spacing_left(double sl, bool allow_negative=false);
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};
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}
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#endif // MAPNIK_MARKERS_PLACEMENT_HPP
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