# File lib/graphviz.rb, line 393
393:   def self.default( hOpts )
394:     hOpts.each do |k, v|
395:       case k.to_s
396:         when "use"
397:           @@prog = v
398:         when "path"
399:           @@path = v
400:         when "output"
401:           @@format = v
402:         else
403:           warn "Invalide option #{k}!"
404:       end
405:     end
406:   end