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_);
if (writer_.first) writer_.first->add_text(
finder_->get_results(), finder_->get_extents(),
feature_, t_, writer_.second);
finder_->update_detector();
return true;
}
//No placement for this point. Keep it in points_ for next try.
point_itr_++;
}
return false;
}
text_symbolizer_helper<FaceManagerT, DetectorT>::text_symbolizer_helper(text_symbolizer const& sym,
feature_impl const& feature,
proj_transform const& prj_trans,
unsigned width,
unsigned height,
double scale_factor,
CoordTransform const& t,
FaceManagerT &font_manager,
DetectorT &detector,
box2d<double> const& query_extent)
: sym_(sym),
feature_(feature),
prj_trans_(prj_trans),
t_(t),
font_manager_(font_manager),
detector_(detector),
dims_(0, 0, width, height),
query_extent_(query_extent),
text_(font_manager, scale_factor),
angle_(0.0),
placement_valid_(false),
points_on_line_(false),
finder_(0)
{
initialize_geometries();
if (!geometries_to_process_.size()) return;
placement_ = sym_.get_placement_options()->get_placement_info(scale_factor);
next_placement();
initialize_points();
}
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;
}
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_);
if (writer_.first) writer_.first->add_text(
finder_->get_results(), finder_->get_extents(),
feature_, t_, writer_.second);
return true;
}
//No placement for this geometry. Keep it in geometries_to_process_ for next try.
geo_itr_++;
}
return false;
}
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;
}