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Merge pull request #908 from MapQuest/shield-placement-bug

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Fixed bug in shield line placement
This commit is contained in:
Dane Springmeyer 2011-10-17 14:08:50 -07:00
commit 1fe029c6e9
3 changed files with 32 additions and 5 deletions
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4
include/mapnik/placement_finder.hpp
View file

@ -77,6 +77,10 @@ struct placement : boost::noncopyable
std::pair<double, double> dimensions;
bool collect_extents;
box2d<double> extents;
// additional boxes attached to the text labels which must also be
// placed in order for the text placement to succeed. e.g: shields.
std::vector<box2d<double> > additional_boxes;
};

15
src/agg/process_shield_symbolizer.cpp
View file

@ -229,12 +229,17 @@ void agg_renderer<T>::process(shield_symbolizer const& sym,
else if (geom.num_points() > 1 && how_placed == LINE_PLACEMENT)
{
placement text_placement(info, sym, scale_factor_, label_ext.width(), label_ext.height(), true);
placement text_placement(info, sym, scale_factor_, w, h, false);
position const& pos = sym.get_displacement();
text_placement.avoid_edges = sym.get_avoid_edges();
text_placement.additional_boxes.push_back(
box2d<double>(-0.5 * label_ext.width() - boost::get<0>(pos),
-0.5 * label_ext.height() - boost::get<1>(pos),
0.5 * label_ext.width() - boost::get<0>(pos),
0.5 * label_ext.height() - boost::get<1>(pos)));
finder.find_point_placements<path_type>(text_placement, placement_options, path);
position const& pos = sym.get_displacement();
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
{
double x = floor(text_placement.placements[ii].starting_x);
@ -244,13 +249,13 @@ void agg_renderer<T>::process(shield_symbolizer const& sym,
double ly = y - boost::get<1>(pos);
int px=int(floor(lx - (0.5*w))) + 1;
int py=int(floor(ly - (0.5*h))) + 1;
label_ext.re_center(lx, ly);
render_marker(px,py,**marker,tr,sym.get_opacity());
if (writer.first) writer.first->add_box(label_ext, feature, t_, writer.second);
box2d<double> dim = ren.prepare_glyphs(&text_placement.placements[ii]);
ren.render(x,y);
if (writer.first) writer.first->add_box(label_ext, feature, t_, writer.second);
}
finder.update_detector(text_placement);
if (writer.first) writer.first->add_text(text_placement, faces, feature, t_, writer.second);

18
src/placement_finder.cpp
View file

@ -38,6 +38,7 @@
#include <boost/utility.hpp>
#include <boost/ptr_container/ptr_vector.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/foreach.hpp>
//stl
#include <string>
@ -482,6 +483,23 @@ void placement_finder<DetectorT>::find_point_placement(placement & p,
x += cwidth; // move position to next character
}
// check the placement of any additional envelopes
if (!p.allow_overlap && !p.additional_boxes.empty())
{
BOOST_FOREACH(box2d<double> box, p.additional_boxes)
{
box2d<double> pt(box.minx() + current_placement->starting_x,
box.miny() + current_placement->starting_y,
box.maxx() + current_placement->starting_x,
box.maxy() + current_placement->starting_y);
// abort the whole placement if the additional envelopes can't be placed.
if (!detector_.has_point_placement(pt, p.minimum_distance)) return;
c_envelopes.push(pt);
}
}
// since there was no early exit, add the character envelopes to the placements' envelopes
while( !c_envelopes.empty() )
{