-require 'ostruct'
-
require 'logger'
$log = Logger.new(STDERR)
$log.level = Logger::WARN
edge << vertex1 << vertex2
end
+ def to_dot(opts = {})
+ vertex_args = opts[:vertex_args] || {}
+ vertex_block = opts[:vertex_block] || nil
+ edge_args = opts[:edge_args] || {}
+ edge_block = opts[:edge_block] || nil
+ dot = "graph {\n"
+ self.vertices.each do |v|
+ if vertex_block.nil?
+ dot << v.to_dot(vertex_args)
+ else
+ dot << v.to_dot(&vertex_block)
+ end
+ dot << "\n"
+ end
+ self.edges.each do |e|
+ if edge_block.nil?
+ dot << e.to_dot(edge_args)
+ else
+ dot << e.to_dot(&edge_block)
+ end
+ dot << "\n"
+ end
+ dot << '}'
+ end
+
# Form a product graph of this graph and the other.
# Return the product graph.
def product(other)