Object
Provides font information and helper functions.
Shortcut interface for constructing a font object. Filenames of the form *.ttf will call Font::TTF.new, *.dfont Font::DFont.new, and anything else will be passed through to Font::AFM.new()
# File lib/prawn/font.rb, line 241 def self.load(document,name,options={}) case name when /\.ttf$/ then TTF.new(document, name, options) when /\.dfont$/ then DFont.new(document, name, options) when /\.afm$/ then AFM.new(document, name, options) else AFM.new(document, name, options) end end
Registers the given subset of the current font with the current PDF page. This is safe to call multiple times for a given font and subset, as it will only add the font the first time it is called.
# File lib/prawn/font.rb, line 320 def add_to_current_page(subset) @references[subset] ||= register(subset) @document.state.page.fonts.merge!(identifier_for(subset) => @references[subset]) end
The size of the font ascender in PDF points
# File lib/prawn/font.rb, line 264 def ascender @ascender / 1000.0 * size end
The size of the font descender in PDF points
# File lib/prawn/font.rb, line 270 def descender -@descender / 1000.0 * size end
Gets height of current font in PDF points at current font size
# File lib/prawn/font.rb, line 312 def height height_at(size) end
Gets height of current font in PDF points at the given font size
# File lib/prawn/font.rb, line 305 def height_at(size) @normalized_height ||= (@ascender - @descender + @line_gap) / 1000.0 @normalized_height * size end
# File lib/prawn/font.rb, line 280 def identifier_for(subset) "#{@identifier}.#{subset}".to_sym end
# File lib/prawn/font.rb, line 284 def inspect "#{self.class.name}< #{name}: #{size} >" end
The size of the recommended gap between lines of text in PDF points
# File lib/prawn/font.rb, line 276 def line_gap @line_gap / 1000.0 * size end
Normalizes the encoding of the string to an encoding supported by the font. The string is expected to be UTF-8 going in. It will be re-encoded and the new string will be returned. For an in-place (destructive) version, see normalize_encoding!.
# File lib/prawn/font.rb, line 292 def normalize_encoding(string) raise NotImplementedError, "subclasses of Prawn::Font must implement #normalize_encoding" end
Destructive version of normalize_encoding; normalizes the encoding of a string in place.
# File lib/prawn/font.rb, line 299 def normalize_encoding!(str) str.replace(normalize_encoding(str)) end
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