420 lines
15 KiB
C++
420 lines
15 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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// mapnik
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#include <mapnik/symbolizer_helpers.hpp>
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#include <mapnik/label_collision_detector.hpp>
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#include <mapnik/placement_finder.hpp>
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#include "agg_conv_clip_polyline.h"
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namespace mapnik {
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template <typename FaceManagerT, typename DetectorT>
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bool text_symbolizer_helper<FaceManagerT, DetectorT>::next()
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{
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if (!placement_valid_) return false;
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if (point_placement_)
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return next_point_placement();
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else
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return next_line_placement();
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}
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template <typename FaceManagerT, typename DetectorT>
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bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
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{
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while (!geometries_to_process_.empty())
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{
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if (geo_itr_ == geometries_to_process_.end())
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{
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//Just processed the last geometry. Try next placement.
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if (!next_placement()) return false; //No more placements
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//Start again from begin of list
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geo_itr_ = geometries_to_process_.begin();
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continue; //Reexecute size check
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}
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typedef agg::conv_clip_polyline<geometry_type> clipped_geometry_type;
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typedef coord_transform2<CoordTransform,clipped_geometry_type> path_type;
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clipped_geometry_type clipped(**geo_itr_);
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clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
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path_type path(t_, clipped, prj_trans_);
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finder_->clear_placements();
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if (points_on_line_) {
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finder_->find_point_placements(path);
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} else {
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finder_->find_line_placements(path);
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}
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if (!finder_->get_results().empty())
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{
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//Found a placement
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if (points_on_line_)
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{
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finder_->update_detector();
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}
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geo_itr_ = geometries_to_process_.erase(geo_itr_);
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if (writer_.first) writer_.first->add_text(
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finder_->get_results(), finder_->get_extents(),
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feature_, t_, writer_.second);
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return true;
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}
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//No placement for this geometry. Keep it in geometries_to_process_ for next try.
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geo_itr_++;
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}
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return false;
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}
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template <typename FaceManagerT, typename DetectorT>
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bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
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{
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while (!points_.empty())
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{
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if (point_itr_ == points_.end())
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{
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//Just processed the last point. Try next placement.
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if (!next_placement()) return false; //No more placements
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//Start again from begin of list
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point_itr_ = points_.begin();
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continue; //Reexecute size check
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}
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finder_->clear_placements();
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finder_->find_point_placement(point_itr_->first, point_itr_->second, angle_);
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if (!finder_->get_results().empty())
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{
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//Found a placement
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point_itr_ = points_.erase(point_itr_);
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if (writer_.first) writer_.first->add_text(
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finder_->get_results(), finder_->get_extents(),
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feature_, t_, writer_.second);
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finder_->update_detector();
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return true;
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}
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//No placement for this point. Keep it in points_ for next try.
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point_itr_++;
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}
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return false;
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}
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struct largest_bbox_first
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{
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bool operator() (geometry_type const* g0, geometry_type const* g1) const
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{
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box2d<double> b0 = g0->envelope();
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box2d<double> b1 = g1->envelope();
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return b0.width()*b0.height() > b1.width()*b1.height();
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}
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};
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template <typename FaceManagerT, typename DetectorT>
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void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_geometries()
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{
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bool largest_box_only = false;
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unsigned num_geom = feature_.num_geometries();
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for (unsigned i=0; i<num_geom; ++i)
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{
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geometry_type const& geom = feature_.get_geometry(i);
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// don't bother with empty geometries
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if (geom.num_points() == 0) continue;
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eGeomType type = geom.type();
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if (type == Polygon)
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{
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largest_box_only = true;
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if (sym_.get_minimum_path_length() > 0)
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{
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box2d<double> gbox = t_.forward(geom.envelope(), prj_trans_);
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if (gbox.width() < sym_.get_minimum_path_length())
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{
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continue;
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}
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}
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}
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// TODO - calculate length here as well
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geometries_to_process_.push_back(const_cast<geometry_type*>(&geom));
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}
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if (largest_box_only)
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{
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geometries_to_process_.sort(largest_bbox_first());
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geo_itr_ = geometries_to_process_.begin();
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geometries_to_process_.erase(++geo_itr_,geometries_to_process_.end());
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}
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geo_itr_ = geometries_to_process_.begin();
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}
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template <typename FaceManagerT, typename DetectorT>
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void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_points()
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{
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label_placement_enum how_placed = placement_->properties.label_placement;
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if (how_placed == LINE_PLACEMENT)
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{
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point_placement_ = false;
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return;
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}
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else
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{
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point_placement_ = true;
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}
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double label_x=0.0;
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double label_y=0.0;
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double z=0.0;
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std::list<geometry_type*>::const_iterator itr = geometries_to_process_.begin();
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std::list<geometry_type*>::const_iterator end = geometries_to_process_.end();
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for (; itr != end; itr++)
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{
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geometry_type const& geom = **itr;
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if (how_placed == VERTEX_PLACEMENT)
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{
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geom.rewind(0);
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for(unsigned i = 0; i < geom.num_points(); i++)
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{
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geom.vertex(&label_x, &label_y);
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prj_trans_.backward(label_x, label_y, z);
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t_.forward(&label_x, &label_y);
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points_.push_back(std::make_pair(label_x, label_y));
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}
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}
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else
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{
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if (how_placed == POINT_PLACEMENT)
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{
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geom.label_position(&label_x, &label_y);
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}
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else if (how_placed == INTERIOR_PLACEMENT)
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{
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geom.label_interior_position(&label_x, &label_y);
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}
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else
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{
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MAPNIK_LOG_ERROR(symbolizer_helpers) << "ERROR: Unknown placement type in initialize_points()";
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}
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prj_trans_.backward(label_x, label_y, z);
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t_.forward(&label_x, &label_y);
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points_.push_back(std::make_pair(label_x, label_y));
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}
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}
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point_itr_ = points_.begin();
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}
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template <typename FaceManagerT, typename DetectorT>
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bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_placement()
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{
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if (!placement_->next()) {
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placement_valid_ = false;
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return false;
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}
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placement_->properties.process(text_, feature_);
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info_ = &(text_.get_string_info());
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if (placement_->properties.orientation)
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{
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angle_ = boost::apply_visitor(
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evaluate<Feature, value_type>(feature_),
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*(placement_->properties.orientation)).to_double();
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} else {
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angle_ = 0.0;
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}
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finder_ = boost::shared_ptr<placement_finder<DetectorT> >(new placement_finder<DetectorT>(feature_, *placement_, *info_, detector_, dims_));
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// boost::make_shared<placement_finder<DetectorT> >(feature_, *placement_, *info_, detector_, dims_);
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if (writer_.first) finder_->set_collect_extents(true);
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placement_valid_ = true;
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return true;
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}
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template <typename FaceManagerT, typename DetectorT>
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placements_type &text_symbolizer_helper<FaceManagerT, DetectorT>::placements() const
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{
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return finder_->get_results();
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}
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/*****************************************************************************/
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template <typename FaceManagerT, typename DetectorT>
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bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next()
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{
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if (!placement_valid_ || !marker_) return false;
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if (point_placement_)
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return next_point_placement();
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else
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return next_line_placement();
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}
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template <typename FaceManagerT, typename DetectorT>
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bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
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{
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position const& shield_pos = sym_.get_shield_displacement();
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while (!points_.empty())
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{
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if (point_itr_ == points_.end())
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{
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//Just processed the last point. Try next placement.
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if (!next_placement()) return false; //No more placements
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//Start again from begin of list
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point_itr_ = points_.begin();
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continue; //Reexecute size check
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}
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position const& text_disp = placement_->properties.displacement;
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double label_x = point_itr_->first + shield_pos.first;
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double label_y = point_itr_->second + shield_pos.second;
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finder_->clear_placements();
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finder_->find_point_placement(label_x, label_y, angle_);
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if (finder_->get_results().empty())
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{
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//No placement for this point. Keep it in points_ for next try.
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point_itr_++;
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continue;
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}
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//Found a label placement but not necessarily also a marker placement
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// check to see if image overlaps anything too, there is only ever 1 placement found for points and verticies
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if (!sym_.get_unlock_image())
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{
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// center image at text center position
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// remove displacement from image label
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placements_type const& p = finder_->get_results();
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double lx = p[0].center.x - text_disp.first;
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double ly = p[0].center.y - text_disp.second;
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marker_x_ = lx - 0.5 * marker_w_;
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marker_y_ = ly - 0.5 * marker_h_;
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marker_ext_.re_center(lx, ly);
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}
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else
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{ // center image at reference location
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marker_x_ = label_x - 0.5 * marker_w_;
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marker_y_ = label_y - 0.5 * marker_h_;
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marker_ext_.re_center(label_x, label_y);
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}
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if (placement_->properties.allow_overlap || detector_.has_placement(marker_ext_))
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{
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detector_.insert(marker_ext_);
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finder_->update_detector();
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if (writer_.first) {
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writer_.first->add_box(marker_ext_, feature_, t_, writer_.second);
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writer_.first->add_text(finder_->get_results(), finder_->get_extents(),
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feature_, t_, writer_.second);
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}
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point_itr_ = points_.erase(point_itr_);
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return true;
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}
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//No placement found. Try again
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point_itr_++;
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}
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return false;
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}
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template <typename FaceManagerT, typename DetectorT>
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bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
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{
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position const& pos = placement_->properties.displacement;
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finder_->additional_boxes.clear();
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//Markers are automatically centered
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finder_->additional_boxes.push_back(
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box2d<double>(-0.5 * marker_ext_.width() - pos.first,
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-0.5 * marker_ext_.height() - pos.second,
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0.5 * marker_ext_.width() - pos.first,
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0.5 * marker_ext_.height() - pos.second));
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return text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement();
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}
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template <typename FaceManagerT, typename DetectorT>
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void shield_symbolizer_helper<FaceManagerT, DetectorT>::init_marker()
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{
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std::string filename = path_processor_type::evaluate(*sym_.get_filename(), this->feature_);
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boost::array<double,6> const& m = sym_.get_image_transform();
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image_transform_.load_from(&m[0]);
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marker_.reset();
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if (!filename.empty())
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{
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marker_ = marker_cache::instance()->find(filename, true);
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}
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if (!marker_) {
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marker_w_ = 0;
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marker_h_ = 0;
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marker_ext_.init(0, 0, 0, 0);
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return;
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}
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marker_w_ = (*marker_)->width();
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marker_h_ = (*marker_)->height();
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double px0 = - 0.5 * marker_w_;
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double py0 = - 0.5 * marker_h_;
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double px1 = 0.5 * marker_w_;
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double py1 = 0.5 * marker_h_;
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double px2 = px1;
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double py2 = py0;
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double px3 = px0;
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double py3 = py1;
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image_transform_.transform(&px0,&py0);
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image_transform_.transform(&px1,&py1);
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image_transform_.transform(&px2,&py2);
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image_transform_.transform(&px3,&py3);
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marker_ext_.init(px0, py0, px1, py1);
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marker_ext_.expand_to_include(px2, py2);
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marker_ext_.expand_to_include(px3, py3);
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}
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template <typename FaceManagerT, typename DetectorT>
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pixel_position shield_symbolizer_helper<FaceManagerT, DetectorT>::get_marker_position(text_path const& p)
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{
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position const& pos = placement_->properties.displacement;
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if (placement_->properties.label_placement == LINE_PLACEMENT) {
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double lx = p.center.x - pos.first;
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double ly = p.center.y - pos.second;
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double px = lx - 0.5*marker_w_;
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double py = ly - 0.5*marker_h_;
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marker_ext_.re_center(lx, ly);
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//label is added to detector by get_line_placement(), but marker isn't
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detector_.insert(marker_ext_);
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if (writer_.first) writer_.first->add_box(marker_ext_, feature_, t_, writer_.second);
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return pixel_position(px, py);
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} else {
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//collision_detector is already updated for point placement in get_point_placement()
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return pixel_position(marker_x_, marker_y_);
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}
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}
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template <typename FaceManagerT, typename DetectorT>
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marker& shield_symbolizer_helper<FaceManagerT, DetectorT>::get_marker() const
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{
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return **marker_;
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}
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template <typename FaceManagerT, typename DetectorT>
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agg::trans_affine const& shield_symbolizer_helper<FaceManagerT, DetectorT>::get_image_transform() const
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{
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return image_transform_;
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}
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template class text_symbolizer_helper<face_manager<freetype_engine>, label_collision_detector4>;
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template class shield_symbolizer_helper<face_manager<freetype_engine>, label_collision_detector4>;
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} //namespace
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