void text_layout::evaluate_properties(feature_impl const& feature, attributes const& attrs)
{
// dx,dy
double dx = util::apply_visitor(extract_value<value_double>(feature,attrs), properties_.dx);
double dy = util::apply_visitor(extract_value<value_double>(feature,attrs), properties_.dy);
displacement_ = evaluate_displacement(dx,dy, properties_.dir);
std::string wrap_str = util::apply_visitor(extract_value<std::string>(feature,attrs), properties_.wrap_char);
if (!wrap_str.empty()) wrap_char_ = wrap_str[0];
wrap_width_ = util::apply_visitor(extract_value<value_double>(feature,attrs), properties_.wrap_width);
double angle = util::apply_visitor(extract_value<value_double>(feature,attrs), properties_.orientation);
orientation_.init(angle * M_PI/ 180.0);
wrap_before_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), properties_.wrap_before);
repeat_wrap_char_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), properties_.repeat_wrap_char);
rotate_displacement_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), properties_.rotate_displacement);
valign_ = util::apply_visitor(extract_value<vertical_alignment_enum>(feature,attrs),properties_.valign);
halign_ = util::apply_visitor(extract_value<horizontal_alignment_enum>(feature,attrs),properties_.halign);
jalign_ = util::apply_visitor(extract_value<justify_alignment_enum>(feature,attrs),properties_.jalign);
}
text_layout::text_layout(face_manager_freetype & font_manager,
feature_impl const& feature,
attributes const& attrs,
double scale_factor,
text_symbolizer_properties const& properties,
text_layout_properties const& layout_defaults,
formatting::node_ptr tree)
: font_manager_(font_manager),
scale_factor_(scale_factor),
itemizer_(),
width_map_(),
width_(0.0),
height_(0.0),
glyphs_count_(0),
lines_(),
layout_properties_(layout_defaults),
properties_(properties),
format_(std::make_unique<detail::evaluated_format_properties>())
{
double dx = util::apply_visitor(extract_value<value_double>(feature,attrs), layout_properties_.dx);
double dy = util::apply_visitor(extract_value<value_double>(feature,attrs), layout_properties_.dy);
displacement_ = evaluate_displacement(dx,dy, layout_properties_.dir);
std::string wrap_str = util::apply_visitor(extract_value<std::string>(feature,attrs), layout_properties_.wrap_char);
if (!wrap_str.empty()) wrap_char_ = wrap_str[0];
wrap_width_ = util::apply_visitor(extract_value<value_double>(feature,attrs), layout_properties_.wrap_width);
double angle = util::apply_visitor(extract_value<value_double>(feature,attrs), layout_properties_.orientation);
orientation_.init(angle * M_PI/ 180.0);
wrap_before_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), layout_properties_.wrap_before);
repeat_wrap_char_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), layout_properties_.repeat_wrap_char);
rotate_displacement_ = util::apply_visitor(extract_value<value_bool>(feature,attrs), layout_properties_.rotate_displacement);
valign_ = util::apply_visitor(extract_value<vertical_alignment_enum>(feature,attrs),layout_properties_.valign);
halign_ = util::apply_visitor(extract_value<horizontal_alignment_enum>(feature,attrs),layout_properties_.halign);
jalign_ = util::apply_visitor(extract_value<justify_alignment_enum>(feature,attrs),layout_properties_.jalign);
// Takes a feature and produces formatted text as output.
if (tree)
{
format_properties const& format_defaults = properties_.format_defaults;
format_->text_size = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.text_size);
format_->character_spacing = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.character_spacing);
format_->line_spacing = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.line_spacing);
format_->text_opacity = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.text_opacity);
format_->halo_opacity = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.halo_opacity);
format_->halo_radius = util::apply_visitor(extract_value<value_double>(feature,attrs), format_defaults.halo_radius);
format_->fill = util::apply_visitor(extract_value<color>(feature,attrs), format_defaults.fill);
format_->halo_fill = util::apply_visitor(extract_value<color>(feature,attrs), format_defaults.halo_fill);
format_->text_transform = util::apply_visitor(extract_value<text_transform_enum>(feature,attrs), format_defaults.text_transform);
format_->face_name = format_defaults.face_name;
format_->fontset = format_defaults.fontset;
format_->ff_settings = util::apply_visitor(extract_value<font_feature_settings>(feature,attrs), format_defaults.ff_settings);
// Turn off ligatures if character_spacing > 0.
if (format_->character_spacing > .0 && format_->ff_settings.count() == 0)
{
format_->ff_settings.append(font_feature_liga_off);
}
tree->apply(format_, feature, attrs, *this);
}
else
{
MAPNIK_LOG_WARN(text_properties) << "text_symbolizer_properties can't produce text: No formatting tree!";
}
}
