Class: MOSAIK::Graph::Visualizer

Inherits:
Object
  • Object
show all
Defined in:
lib/mosaik/graph/visualizer.rb

Overview

Visualize the graph

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options, graph) ⇒ Visualizer

Returns a new instance of Visualizer.



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# File 'lib/mosaik/graph/visualizer.rb', line 11

def initialize(options, graph)
  @options = options
  @graph = graph
end

Instance Attribute Details

#graph ⇒ Object (readonly)

Returns the value of attribute graph.



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# File 'lib/mosaik/graph/visualizer.rb', line 9

def graph
  @graph
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/mosaik/graph/visualizer.rb', line 9

def options
  @options
end

Instance Method Details

#to_dot ⇒ Object 



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# File 'lib/mosaik/graph/visualizer.rb', line 16

def to_dot
  # Set of visited edges (to avoid duplicates in undirected graphs)
  visited = Set.new

  # List of vertices with incoming or outgoing edges
  coupled_vertices = graph
    .vertices
    .values
    .select { |v| v.edges.any? } + graph
      .vertices
      .values
      .map { |v| v.edges.keys }
      .flatten(2)
      .uniq
      .map { |id| graph.find_vertex(id) }

  [
    graph.directed ? "digraph {" : "graph {",
    (if graph.clusters.any?
       graph
         .clusters
         .values
         .filter_map do |cluster|
         next unless options[:show_uncoupled] || (cluster.vertices.any? { |vertex| vertex.edges.any? })

         [
           "subgraph \"#{cluster.id}\" {",
           "  cluster = true",
           "  label = \"#{cluster.id}\"",
           '  color = "gray"',
           *cluster.vertices.map { |vertex| "  \"#{vertex.id}\"" },
           "}",
         ]
       end.join("\n  ").prepend("  ")
     end),
    graph
      .vertices
      .values
      .map do |vertex|
      [
        ("\"#{vertex.id}\" [shape=circle, width=1, fixedsize=true, fontsize=12, style=filled, fillcolor=lightblue]" if options[:show_uncoupled] || vertex.in?(coupled_vertices)),
        *vertex
          .edges
          .flat_map do |key, edges|
          edges.map do |edge|
            next if edge.in? visited

            visited << edge

            [
              "\"#{vertex.id}\" ",
              graph.directed? ? "->" : "--",
              " \"#{key}\"",
              options[:show_labels] && edge.attributes.any? ? " [label=\"#{edge.attributes.map { |ek, ev| "#{ek}: #{ev}" }.join(', ')}\"]" : nil,
            ].compact.join
          end
        end,
      ].compact_blank.join("\n  ")
    end.compact_blank.join("\n  ").prepend("  "),
    "}\n",
  ].compact.join("\n")
end

#to_png(file) ⇒ Object 



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# File 'lib/mosaik/graph/visualizer.rb', line 79

def to_png(file)
  File.write("#{file}.gv", to_dot)
  system("#{options.fetch(:renderer, 'dot')} -x -Goverlap=scale -Tpng #{file}.gv -o #{file}.png#{' 2> /dev/null' unless options[:debug]}")
end

#to_svg(file) ⇒ Object 



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# File 'lib/mosaik/graph/visualizer.rb', line 84

def to_svg(file)
  File.write("#{file}.gv", to_dot)
  system("#{options.fetch(:renderer, 'dot')} -x -Goverlap=scale -Tsvg #{file}.gv -o #{file}.svg#{' 2> /dev/null' unless options[:debug]}")
end