# File lib/prawn/svg/interface.rb, line 27
      def initialize(data, prawn, options)
        @data = data
        @prawn = prawn
        @options = options
    
        @options[:at] or raise "options[:at] must be specified"

        prawn.font_families.update(Prawn::Svg::Font.installed_fonts)

        @document = Document.new(data, [prawn.bounds.width, prawn.bounds.height], options)        
      end