lib/djvu-tools/djvu-numberer.rb in djvu-tools-0.0.1 vs lib/djvu-tools/djvu-numberer.rb in djvu-tools-0.1.0

@@ -10,24 +10,26 @@
   # Add a labeled section.
   # @param [Hash] section
   # @see file:README.rdoc The Numberer section in the README
   def add_section section
 
+    section[:delta] ||= 1
+
     if section[:start].nil?
       raise ArgumentError, 'Cannot label a range of pages with the same title' if ( section[:range].max - section[:range].min > 0 )
       section[:range].each { |n| @djvu.title_page n, section[:title]  }
     else
       section[:range].each_with_index do |n, i|
-      number = section[:start] + i
-      number =
-        case section[:type]
-        when :arabic
-          number.to_s
-        when :upper_roman
-          RomanNumerals::to_roman(number).upcase
-        when :lower_roman
-          RomanNumerals::to_roman(number).downcase
-        end
+        number = section[:start] + i * section[:delta].to_i
+        number =
+          case section[:type]
+          when :arabic
+            number.to_s
+          when :upper_roman
+            RomanNumerals::to_roman(number).upcase
+          when :lower_roman
+            RomanNumerals::to_roman(number).downcase
+          end
         @djvu.title_page n, "#{number}"
       end
     end
   end
 end
\ No newline at end of file