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Port shield placement enhancements from r741 and r745 from the agg

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renderer to the cairo renderer. Should close #136.
This commit is contained in:
Tom Hughes 2008-10-31 00:39:22 +00:00
parent 8955981900
commit 9d6a7f1075
1 changed files with 57 additions and 9 deletions
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56
src/cairo_renderer.cpp
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@ -787,6 +787,9 @@ namespace mapnik
placement_finder<label_collision_detector4> finder(detector_);
int w = data->width();
int h = data->height();
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
@ -794,19 +797,63 @@ namespace mapnik
if (geom.num_points() > 0) // don't bother with empty geometries
{
path_type path(t_, geom, prj_trans);
placement text_placement(info, sym);
if (sym.get_label_placement() == POINT_PLACEMENT)
{
double label_x;
double label_y;
double z = 0.0;
placement text_placement(info, sym, false);
text_placement.avoid_edges = sym.get_avoid_edges();
geom.label_position(&label_x, &label_y);
prj_trans.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
finder.find_point_placement(text_placement, label_x, label_y);
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
{
double x = text_placement.placements[ii].starting_x;
double y = text_placement.placements[ii].starting_y;
// remove displacement from image label
position pos = sym.get_displacement();
double lx = x - boost::get<0>(pos);
double ly = y - boost::get<1>(pos);
int px = int(lx - (0.5 * w)) ;
int py = int(ly - (0.5 * h)) ;
Envelope<double> label_ext (floor(lx - 0.5 * w), floor(ly - 0.5 * h), ceil (lx + 0.5 * w), ceil (ly + 0.5 * h));
if (detector_.has_placement(label_ext))
{
context.add_image(px, py, *data);
context.add_text(sym, text_placement.placements[ii], face_manager_, faces);
detector_.insert(label_ext);
}
}
finder.update_detector(text_placement);
}
else if (geom.num_points() > 1 && sym.get_label_placement() == LINE_PLACEMENT)
{
placement text_placement(info, sym, true);
text_placement.avoid_edges = sym.get_avoid_edges();
finder.find_point_placements<path_type>(text_placement, path);
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
{
double shield_x = text_placement.placements[ii].starting_x - data->width() / 2;
double shield_y = text_placement.placements[ii].starting_y - data->height() / 2;
double x = text_placement.placements[ii].starting_x;
double y = text_placement.placements[ii].starting_y;
int px = int(x - (w/2));
int py = int(y - (h/2));
context.add_image(shield_x, shield_y, *data);
context.add_image(px, py, *data);
context.add_text(sym, text_placement.placements[ii], face_manager_, faces);
}
finder.update_detector(text_placement);
}
}
}
}
@ -982,6 +1029,7 @@ namespace mapnik
prj_trans.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
finder.find_point_placement(text_placement, label_x, label_y);
finder.update_detector(text_placement);
}
else //LINE_PLACEMENT
{