A node representation. Edges are drawn between nodes. The rendering of a node depends upon the options set for it.
Creates a new Node with the params Hash providing settings for all node options. The option_list parameter restricts those options to the list of valid names it contains. The exception to this is the ports option which, if specified, must be an Enumerable containing a list of ports.
# File lib/rgl/rdot.rb, line 233 def initialize (params = {}, option_list = NODE_OPTS) super(params, option_list) @ports = params['ports'] ? params['ports'] : [] end
Returns a string representation of this node which is consumable by the graphviz tools dot and neato. The leader parameter is used to indent every line of the returned string, and the indent parameter is used to additionally indent nested items.
# File lib/rgl/rdot.rb, line 242 def to_s (leader = '', indent = ' ') label_option = nil if @options['shape'] =~ /^M?record$/ && !@ports.empty? then # Ignore the given label option in this case since the ports should each # provide their own name/label. label_option = leader + indent + "#{quote_ID('label')} = #{quote_ID(@ports.collect { |port| port.to_s }.join(" | "))}" elsif @options['label'] then # Otherwise, use the label when given one. label_option = leader + indent + "#{quote_ID('label')} = #{quote_label(@options['label'])}" end # Convert all the options except `label' and options with nil values # straight into name = value pairs. Then toss out any resulting nil # entries in the final array. stringified_options = @options.collect do |name, val| unless name == 'label' || val.nil? then leader + indent + "#{quote_ID(name)} = #{quote_ID(val)}" end end.compact # Append the specially computed label option. stringified_options.push(label_option) unless label_option.nil? # Join them all together. stringified_options = stringified_options.join(",\n") # Put it all together into a single string with indentation and return the # result. if stringified_options.empty? then return leader + quote_ID(@name) unless @name.nil? return nil else return leader + (@name.nil? ? '' : quote_ID(@name) + " ") + "[\n" + stringified_options + "\n" + leader + "]" end end
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