# File lib/png/font.rb, line 53 def annotate(string, x, y, font = PNG::Font.default, align = :left, style = :overwrite) case align when :left then # do nothing when :center then x -= string.length * font.width / 2 when :right then x -= string.length * font.width else raise ArgumentError, "Unknown align: #{align.inspect}" end x_offset, width = 0, font.width string.split(//).each do |char| self.composite font[char], x + x_offset, y x_offset += width end end