initial implementation of multipolygon labeling strategy
based on ordering by bounding box. TODO : sync with https://github.com/herm/mapnik/tree/textplacement
This commit is contained in:
Artem Pavlenko
parent
663b4adfa2
commit
4b22636f3b
1 changed files with 156 additions and 80 deletions
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@ -28,117 +28,192 @@
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namespace mapnik {
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template <typename T>
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void agg_renderer<T>::process(text_symbolizer const& sym,
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Feature const& feature,
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proj_transform const& prj_trans)
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struct largest_bbox_comp
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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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typedef boost::tuple<double,double> point_type;
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typedef std::vector<point_type> label_points_type;
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void get_label_points(label_points_type & labels,
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Feature const& feature,
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text_symbolizer const& sym,
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proj_transform const& prj_trans,
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CoordTransform const& t
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)
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{
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// Use a boost::ptr_vector here instread of std::vector?
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std::vector<geometry_type*> geometries_to_process;
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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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if (geom.num_points() == 0) continue; // don't bother with empty geometries
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if ((geom.type() == Polygon) && sym.get_minimum_path_length() > 0)
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{
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// TODO - find less costly method than fetching full envelope
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box2d<double> gbox = t_.forward(geom.envelope(),prj_trans);
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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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// TODO - calculate length here as well
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geometries_to_process.push_back(const_cast<geometry_type*>(&geom));
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geometries_to_process.push_back(const_cast<geometry_type*>(&geom));
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}
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if (!geometries_to_process.size() > 0)
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return; // early return to avoid significant overhead of rendering setup
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vector<geometry_type*>::const_iterator largest = std::max_element(geometries_to_process.begin(),
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geometries_to_process.end(),
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largest_bbox_comp());
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if (largest != geometries_to_process.end())
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{
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double z=0.0;
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double label_x,label_y;
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if (sym.get_label_placement() == POINT_PLACEMENT)
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(*largest)->label_position(&label_x, &label_y);
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else if (sym.get_label_placement() == INTERIOR_PLACEMENT)
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(*largest)->label_interior_position(&label_x, &label_y);
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else // default to bbox center
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{
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box2d<double> box = (*largest)->envelope();
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coord2d c = box.center();
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label_x = c.x;
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label_y = c.y;
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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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labels.push_back(boost::make_tuple(label_x,label_y));
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}
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/*
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std::sort(geometries_to_process.begin(), geometries_to_process.end(), largest_bbox_first());
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BOOST_FOREACH( geometry_type * g, geometries_to_process)
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{
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double z=0.0;
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double label_x,label_y;
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if (sym.get_label_placement() == POINT_PLACEMENT)
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g->label_position(&label_x, &label_y);
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else
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g->label_interior_position(&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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labels.push_back(boost::make_tuple(label_x,label_y));
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}
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*/
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}
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template <typename T>
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void agg_renderer<T>::process(text_symbolizer const& sym,
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Feature const& feature,
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proj_transform const& prj_trans)
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{
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label_points_type labels;
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get_label_points(labels, feature, sym, prj_trans, t_);
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if (labels.size() == 0) return;
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typedef coord_transform2<CoordTransform,geometry_type> path_type;
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//////////////////////////////////////////////////////////////////////
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expression_ptr name_expr = sym.get_name();
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if (!name_expr) return;
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value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
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UnicodeString text = result.to_unicode();
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if ( sym.get_text_transform() == UPPERCASE)
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{
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text = text.toUpper();
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}
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else if ( sym.get_text_transform() == LOWERCASE)
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{
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text = text.toLower();
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}
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else if ( sym.get_text_transform() == CAPITALIZE)
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{
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text = text.toTitle(0);
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}
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if ( text.length() <= 0 ) return;
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color const& fill = sym.get_fill();
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face_set_ptr faces;
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if (sym.get_fontset().size() > 0)
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{
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faces = font_manager_.get_face_set(sym.get_fontset());
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}
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else
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{
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faces = font_manager_.get_face_set(sym.get_face_name());
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}
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stroker_ptr strk = font_manager_.get_stroker();
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if (!(faces->size() > 0 && strk))
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{
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throw config_error("Unable to find specified font face '" + sym.get_face_name() + "'");
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}
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/////////////////////////
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////////////// renderer
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text_renderer<T> ren(pixmap_, faces, *strk);
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ren.set_fill(fill);
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ren.set_halo_fill(sym.get_halo_fill());
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ren.set_halo_radius(sym.get_halo_radius() * scale_factor_);
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ren.set_opacity(sym.get_text_opacity());
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/////////////////////////
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//////
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box2d<double> dims(0,0,width_,height_);
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placement_finder<label_collision_detector4> finder(*detector_,dims);
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///////////
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bool placement_found = false;
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text_placement_info_ptr placement_options = sym.get_placement_options()->get_placement_info();
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while (!placement_found && placement_options->next())
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{
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expression_ptr name_expr = sym.get_name();
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if (!name_expr) return;
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value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
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UnicodeString text = result.to_unicode();
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if ( sym.get_text_transform() == UPPERCASE)
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{
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text = text.toUpper();
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}
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else if ( sym.get_text_transform() == LOWERCASE)
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{
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text = text.toLower();
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}
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else if ( sym.get_text_transform() == CAPITALIZE)
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{
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text = text.toTitle(NULL);
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}
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if ( text.length() <= 0 ) continue;
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color const& fill = sym.get_fill();
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face_set_ptr faces;
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if (sym.get_fontset().size() > 0)
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{
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faces = font_manager_.get_face_set(sym.get_fontset());
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}
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else
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{
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faces = font_manager_.get_face_set(sym.get_face_name());
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}
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stroker_ptr strk = font_manager_.get_stroker();
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if (!(faces->size() > 0 && strk))
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{
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throw config_error("Unable to find specified font face '" + sym.get_face_name() + "'");
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}
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text_renderer<T> ren(pixmap_, faces, *strk);
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ren.set_character_size(placement_options->text_size * scale_factor_);
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ren.set_fill(fill);
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ren.set_halo_fill(sym.get_halo_fill());
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ren.set_halo_radius(sym.get_halo_radius() * scale_factor_);
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ren.set_opacity(sym.get_text_opacity());
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box2d<double> dims(0,0,width_,height_);
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placement_finder<label_collision_detector4> finder(*detector_,dims);
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string_info info(text);
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string_info info(text);
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faces->get_string_info(info);
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metawriter_with_properties writer = sym.get_metawriter();
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BOOST_FOREACH( geometry_type * geom, geometries_to_process )
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//BOOST_FOREACH( geometry_type * geom, geometries_to_process )
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BOOST_FOREACH (point_type const& pt, labels)
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{
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while (!placement_found && placement_options->next_position_only())
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//while (!placement_found && placement_options->next_position_only())
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{
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placement text_placement(info, sym, scale_factor_);
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text_placement.avoid_edges = sym.get_avoid_edges();
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if (writer.first)
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text_placement.collect_extents =true; // needed for inmem metawriter
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if (sym.get_label_placement() == POINT_PLACEMENT ||
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sym.get_label_placement() == INTERIOR_PLACEMENT)
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//if (sym.get_label_placement() == POINT_PLACEMENT ||
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// sym.get_label_placement() == INTERIOR_PLACEMENT)
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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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if (sym.get_label_placement() == POINT_PLACEMENT)
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geom->label_position(&label_x, &label_y);
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else
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geom->label_interior_position(&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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//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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//if (sym.get_label_placement() == POINT_PLACEMENT)
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// geom->label_position(&label_x, &label_y);
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//else
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// geom->label_interior_position(&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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double angle = 0.0;
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expression_ptr angle_expr = sym.get_orientation();
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if (angle_expr)
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@ -148,17 +223,18 @@ void agg_renderer<T>::process(text_symbolizer const& sym,
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angle = result.to_double();
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}
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finder.find_point_placement(text_placement, placement_options, label_x,label_y,
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finder.find_point_placement(text_placement, placement_options, boost::get<0>(pt),boost::get<1>(pt),
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angle, sym.get_line_spacing(),
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sym.get_character_spacing());
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finder.update_detector(text_placement);
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}
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else if ( geom->num_points() > 1 && sym.get_label_placement() == LINE_PLACEMENT)
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{
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path_type path(t_,*geom,prj_trans);
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finder.find_line_placements<path_type>(text_placement, placement_options, path);
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}
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//else if ( geom->num_points() > 1 && sym.get_label_placement() == LINE_PLACEMENT)
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// {
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// path_type path(t_,*geom,prj_trans);
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// finder.find_line_placements<path_type>(text_placement, placement_options, path);
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// }
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if (!text_placement.placements.size()) continue;
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placement_found = true;
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