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/*****************************************************************************
*
* 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
*
*****************************************************************************/
// mapnik
#include <mapnik/symbolizer_helpers.hpp>
#include <mapnik/label_collision_detector.hpp>
#include <mapnik/placement_finder.hpp>
#include <mapnik/geom_util.hpp>
// agg
#include "agg_conv_clip_polyline.h"
namespace mapnik {
template <typename FaceManagerT, typename DetectorT>
bool text_symbolizer_helper<FaceManagerT, DetectorT>::next()
{
if (!placement_valid_) return false;
if (point_placement_)
return next_point_placement();
else if (sym_.clip())
return next_line_placement_clipped();
else
return next_line_placement();
}
template <typename FaceManagerT, typename DetectorT>
bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
{
while (!geometries_to_process_.empty())
{
if (geo_itr_ == geometries_to_process_.end())
{
//Just processed the last geometry. Try next placement.
if (!next_placement()) return false; //No more placements
//Start again from begin of list
geo_itr_ = geometries_to_process_.begin();
continue; //Reexecute size check
}
typedef coord_transform<CoordTransform,geometry_type> path_type;
path_type path(t_, **geo_itr_, prj_trans_);
finder_->clear_placements();
if (points_on_line_) {
finder_->find_point_placements(path);
} else {
finder_->find_line_placements(path);
}
if (!finder_->get_results().empty())
{
//Found a placement
if (points_on_line_)
{
finder_->update_detector();
}
geo_itr_ = geometries_to_process_.erase(geo_itr_);
return true;
}
//No placement for this geometry. Keep it in geometries_to_process_ for next try.
geo_itr_++;
}
return false;
}
template <typename FaceManagerT, typename DetectorT>
bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement_clipped()
{
while (!geometries_to_process_.empty())
{
if (geo_itr_ == geometries_to_process_.end())
{
//Just processed the last geometry. Try next placement.
if (!next_placement()) return false; //No more placements
//Start again from begin of list
geo_itr_ = geometries_to_process_.begin();
continue; //Reexecute size check
}
typedef agg::conv_clip_polyline<geometry_type> clipped_geometry_type;
typedef coord_transform<CoordTransform,clipped_geometry_type> path_type;
clipped_geometry_type clipped(**geo_itr_);
clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
path_type path(t_, clipped, prj_trans_);
finder_->clear_placements();
if (points_on_line_) {
finder_->find_point_placements(path);
} else {
finder_->find_line_placements(path);
}
if (!finder_->get_results().empty())
{
//Found a placement
if (points_on_line_)
{
finder_->update_detector();
}
geo_itr_ = geometries_to_process_.erase(geo_itr_);
return true;
}
//No placement for this geometry. Keep it in geometries_to_process_ for next try.
geo_itr_++;
}
return false;
}
template <typename FaceManagerT, typename DetectorT>
bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
{
while (!points_.empty())
{
if (point_itr_ == points_.end())
{
//Just processed the last point. Try next placement.
if (!next_placement()) return false; //No more placements
//Start again from begin of list
point_itr_ = points_.begin();
continue; //Reexecute size check
}
finder_->clear_placements();
finder_->find_point_placement(point_itr_->first, point_itr_->second, angle_);
if (!finder_->get_results().empty())
{
//Found a placement
point_itr_ = points_.erase(point_itr_);
finder_->update_detector();
return true;
}
//No placement for this point. Keep it in points_ for next try.
point_itr_++;
}
return false;
}
struct largest_bbox_first
{
bool operator() (geometry_type const* g0, geometry_type const* g1) const
{
box2d<double> b0 = g0->envelope();
box2d<double> b1 = g1->envelope();
return b0.width()*b0.height() > b1.width()*b1.height();
}
};
template <typename FaceManagerT, typename DetectorT>
void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_geometries()
{
bool largest_box_only = false;
unsigned num_geom = feature_.num_geometries();
for (unsigned i=0; i<num_geom; ++i)
{
geometry_type const& geom = feature_.get_geometry(i);
// don't bother with empty geometries
if (geom.size() == 0) continue;
eGeomType type = geom.type();
if (type == Polygon)
{
largest_box_only = sym_.largest_bbox_only();
if (sym_.get_minimum_path_length() > 0)
{
box2d<double> gbox = t_.forward(geom.envelope(), prj_trans_);
if (gbox.width() < sym_.get_minimum_path_length())
{
continue;
}
}
}
// TODO - calculate length here as well
geometries_to_process_.push_back(const_cast<geometry_type*>(&geom));
}
if (largest_box_only)
{
geometries_to_process_.sort(largest_bbox_first());
geo_itr_ = geometries_to_process_.begin();
geometries_to_process_.erase(++geo_itr_,geometries_to_process_.end());
}
geo_itr_ = geometries_to_process_.begin();
}
template <typename FaceManagerT, typename DetectorT>
void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_points()
{
label_placement_enum how_placed = placement_->properties.label_placement;
if (how_placed == LINE_PLACEMENT)
{
point_placement_ = false;
return;
}
else
{
point_placement_ = true;
}
double label_x=0.0;
double label_y=0.0;
double z=0.0;
std::list<geometry_type*>::const_iterator itr = geometries_to_process_.begin();
std::list<geometry_type*>::const_iterator end = geometries_to_process_.end();
for (; itr != end; itr++)
{
geometry_type const& geom = **itr;
if (how_placed == VERTEX_PLACEMENT)
{
geom.rewind(0);
for(unsigned i = 0; i < geom.size(); i++)
{
geom.vertex(&label_x, &label_y);
prj_trans_.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
points_.push_back(std::make_pair(label_x, label_y));
}
}
else
{
// https://github.com/mapnik/mapnik/issues/1423
bool success = false;
// https://github.com/mapnik/mapnik/issues/1350
if (geom.type() == LineString)
{
success = label::middle_point(geom, label_x,label_y);
}
else if (how_placed == POINT_PLACEMENT)
{
success = label::centroid(geom, label_x, label_y);
}
else if (how_placed == INTERIOR_PLACEMENT)
{
success = label::interior_position(geom, label_x, label_y);
}
else
{
MAPNIK_LOG_ERROR(symbolizer_helpers) << "ERROR: Unknown placement type in initialize_points()";
}
if (success)
{
prj_trans_.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
points_.push_back(std::make_pair(label_x, label_y));
}
}
}
point_itr_ = points_.begin();
}
template <typename FaceManagerT, typename DetectorT>
bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_placement()
{
if (!placement_->next()) {
placement_valid_ = false;
return false;
}
placement_->properties.process(text_, feature_);
info_ = &(text_.get_string_info());
if (placement_->properties.orientation)
{
// https://github.com/mapnik/mapnik/issues/1352
mapnik::evaluate<Feature, value_type> evaluator(feature_);
angle_ = boost::apply_visitor(
evaluator,
*(placement_->properties.orientation)).to_double();
} else {
angle_ = 0.0;
}
finder_ = boost::shared_ptr<placement_finder<DetectorT> >(new placement_finder<DetectorT>(feature_, *placement_, *info_, detector_, dims_));
// boost::make_shared<placement_finder<DetectorT> >(feature_, *placement_, *info_, detector_, dims_);
placement_valid_ = true;
return true;
}
template <typename FaceManagerT, typename DetectorT>
placements_type const& text_symbolizer_helper<FaceManagerT, DetectorT>::placements() const
{
return finder_->get_results();
}
/*****************************************************************************/
template <typename FaceManagerT, typename DetectorT>
bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next()
{
if (!placement_valid_ || !marker_) return false;
if (point_placement_)
return next_point_placement();
else
return next_line_placement();
}
template <typename FaceManagerT, typename DetectorT>
bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
{
position const& shield_pos = sym_.get_shield_displacement();
while (!points_.empty())
{
if (point_itr_ == points_.end())
{
//Just processed the last point. Try next placement.
if (!next_placement()) return false; //No more placements
//Start again from begin of list
point_itr_ = points_.begin();
continue; //Reexecute size check
}
position const& text_disp = placement_->properties.displacement;
double label_x = point_itr_->first + shield_pos.first;
double label_y = point_itr_->second + shield_pos.second;
finder_->clear_placements();
finder_->find_point_placement(label_x, label_y, angle_);
if (finder_->get_results().empty())
{
//No placement for this point. Keep it in points_ for next try.
point_itr_++;
continue;
}
//Found a label placement but not necessarily also a marker placement
// check to see if image overlaps anything too, there is only ever 1 placement found for points and verticies
if (!sym_.get_unlock_image())
{
// center image at text center position
// remove displacement from image label
placements_type const& p = finder_->get_results();
double lx = p[0].center.x - text_disp.first;
double ly = p[0].center.y - text_disp.second;
marker_x_ = lx - 0.5 * marker_w_;
marker_y_ = ly - 0.5 * marker_h_;
marker_ext_.re_center(lx, ly);
}
else
{ // center image at reference location
marker_x_ = label_x - 0.5 * marker_w_;
marker_y_ = label_y - 0.5 * marker_h_;
marker_ext_.re_center(label_x, label_y);
}
if (placement_->properties.allow_overlap || detector_.has_placement(marker_ext_))
{
detector_.insert(marker_ext_);
finder_->update_detector();
point_itr_ = points_.erase(point_itr_);
return true;
}
//No placement found. Try again
point_itr_++;
}
return false;
}
template <typename FaceManagerT, typename DetectorT>
bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
{
position const& pos = placement_->properties.displacement;
finder_->additional_boxes().clear();
//Markers are automatically centered
finder_->additional_boxes().push_back(
box2d<double>(-0.5 * marker_ext_.width() - pos.first,
-0.5 * marker_ext_.height() - pos.second,
0.5 * marker_ext_.width() - pos.first,
0.5 * marker_ext_.height() - pos.second));
if ( sym_.clip())
return text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement_clipped();
else
return text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement();
}
template <typename FaceManagerT, typename DetectorT>
void shield_symbolizer_helper<FaceManagerT, DetectorT>::init_marker()
{
std::string filename = path_processor_type::evaluate(*sym_.get_filename(), this->feature_);
evaluate_transform(image_transform_, feature_, sym_.get_image_transform());
marker_.reset();
if (!filename.empty())
{
marker_ = marker_cache::instance().find(filename, true);
}
if (!marker_) {
marker_w_ = 0;
marker_h_ = 0;
marker_ext_.init(0, 0, 0, 0);
return;
}
marker_w_ = (*marker_)->width();
marker_h_ = (*marker_)->height();
double px0 = - 0.5 * marker_w_;
double py0 = - 0.5 * marker_h_;
double px1 = 0.5 * marker_w_;
double py1 = 0.5 * marker_h_;
double px2 = px1;
double py2 = py0;
double px3 = px0;
double py3 = py1;
image_transform_.transform(&px0,&py0);
image_transform_.transform(&px1,&py1);
image_transform_.transform(&px2,&py2);
image_transform_.transform(&px3,&py3);
marker_ext_.init(px0, py0, px1, py1);
marker_ext_.expand_to_include(px2, py2);
marker_ext_.expand_to_include(px3, py3);
}
template <typename FaceManagerT, typename DetectorT>
pixel_position shield_symbolizer_helper<FaceManagerT, DetectorT>::get_marker_position(text_path const& p)
{
position const& pos = placement_->properties.displacement;
if (placement_->properties.label_placement == LINE_PLACEMENT) {
double lx = p.center.x - pos.first;
double ly = p.center.y - pos.second;
double px = lx - 0.5*marker_w_;
double py = ly - 0.5*marker_h_;
marker_ext_.re_center(lx, ly);
//label is added to detector by get_line_placement(), but marker isn't
detector_.insert(marker_ext_);
return pixel_position(px, py);
} else {
//collision_detector is already updated for point placement in get_point_placement()
return pixel_position(marker_x_, marker_y_);
}
}
template <typename FaceManagerT, typename DetectorT>
marker& shield_symbolizer_helper<FaceManagerT, DetectorT>::get_marker() const
{
return **marker_;
}
template <typename FaceManagerT, typename DetectorT>
agg::trans_affine const& shield_symbolizer_helper<FaceManagerT, DetectorT>::get_image_transform() const
{
return image_transform_;
}
template class text_symbolizer_helper<face_manager<freetype_engine>, label_collision_detector4>;
template class shield_symbolizer_helper<face_manager<freetype_engine>, label_collision_detector4>;
} //namespace
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