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Correctly handle glyph clusters.

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This commit is contained in:
Hermann Kraus 2012-08-06 01:26:24 +02:00
parent b7ac16d460
commit 3db18cfa50
3 changed files with 30 additions and 15 deletions
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2
include/mapnik/text/layout.hpp
View file

@ -99,6 +99,8 @@ public:
const_iterator end() const;
unsigned size() const;
double cluster_width(unsigned cluster) const;
private:
void break_line(text_line_ptr line, double wrap_width, unsigned text_ratio);
void shape_text(text_line_ptr line);

7
src/text/layout.cpp
View file

@ -242,6 +242,13 @@ unsigned text_layout::size() const
return lines_.size();
}
double text_layout::cluster_width(unsigned cluster) const
{
std::map<unsigned, double>::const_iterator width_itr = width_map_.find(cluster);
if (width_itr != width_map_.end()) return width_itr->second;
return 0;
}
/*********************************************************************************************/
text_line::text_line(unsigned first_char, unsigned last_char)

36
src/text/placement_finder_ng.cpp
View file

@ -338,31 +338,37 @@ bool placement_finder_ng::single_line_placement(vertex_cache &pp, text_upright_e
offset -= (*line_itr)->height();
pp.set_offset(offset);
double last_glyph_angle = 999;
double last_cluster_angle = 999;
// signed current_cluster = -1;
double angle, sina, cosa;
text_line::const_iterator glyph_itr = (*line_itr)->begin(), glyph_end = (*line_itr)->end();
for (; glyph_itr != glyph_end; glyph_itr++)
{
double angle = normalize_angle(pp.angle(sign * glyph_itr->width));
double sina = sin(angle);
double cosa = cos(angle);
if (glyph_itr->width > 0)
{
//Only calculate new angle at the start of each cluster!
angle = normalize_angle(pp.angle(sign * glyph_itr->width));
sina = sin(angle);
cosa = cos(angle);
if ((info_->properties.max_char_angle_delta > 0) && (last_cluster_angle != 999) &&
fabs(normalize_angle(angle-last_cluster_angle)) > info_->properties.max_char_angle_delta)
{
pp.restore_state(s);
return false;
}
last_cluster_angle = angle;
// current_cluster = glyph_itr->char_index;
}
if (abs(angle) > M_PI/2) upside_down_glyph_count++;
pixel_position pos = pp.current_position();
//Center the text on the line
pos.y = -pos.y - char_height/2.0*cosa;
pos.x = pos.x + char_height/2.0*sina;
if (abs(angle) > M_PI/2) upside_down_glyph_count++;
if ((info_->properties.max_char_angle_delta > 0) && (last_glyph_angle != 999) &&
fabs(normalize_angle(angle-last_glyph_angle)) > info_->properties.max_char_angle_delta)
{
pp.restore_state(s);
return false;
}
last_glyph_angle = angle;
glyphs->push_back(*glyph_itr, pos, angle); //TODO: Store cosa, sina instead
if (glyph_itr->width)
if (glyph_itr->width > 0)
{
//Only advance if glyph is not part of a multiple glyph sequence
pp.move(sign * (glyph_itr->width + glyph_itr->format->character_spacing));