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Graphvix

Build Status

Graphviz in Elixir

Installation

If available in Hex, the package can be installed as:

  1. Add graphvix to your list of dependencies in mix.exs:
def deps do
  [{:graphvix, "~> 1.0.0"}]
end

Usage

See the wiki for examples.

API Overview

  • Create a new graph

    Graphvix.Graph.new/0

  • Add a vertex to a graph

    Graphvix.Graph.add_vertex/2 Graphvix.Graph.add_vertex/3

  • Add an edge between two vertices

    Graphvix.Graph.add_edge/3 Graphvix.Graph.add_edge/4

  • Create a vertex with type record

    Graphvix.Record.new/1 Graphvix.Record.new/2

  • Add a record vertex to a graph

    Graphvix.Graph.add_record/2

  • Create a vertex using HTML table markup

    Graphvix.HTMLRecord.new/1 Graphvix.HTMLRecord.new/2

  • Add an HTML table vertex to a graph

    Graphvix.Graph.add_html_record/2

  • Save a graph to disk in .dot format

    Graphvix.Graph.write/2

  • Save and compile a graph (defaults to .png)

    Graphvix.Graph.compile/2 Graphvix.Graph.compile/3

  • Save, compile and open a graph (defaults to .png and your OS's default image viewer)

    Graphvix.Graph.graph/2 Graphvix.Graph.graph/3

Basic Usage

  1. Alias the necessary module for ease of use

    alias Graphvix.Graph
  2. Create a new graph.

    graph = Graph.new()
  3. Add a simple vertex with a label

    {graph, vertex_id} = Graph.add_vertex(graph, "vertex label")
  4. Add a vertex with a label and attributes

    {graph, vertex2_id} = Graph.add_vertex(
      graph,
      "my other vertex",
      color: "blue", shape: "diamond"
    )
  5. Add an edge between two existing vertices

    {graph, edge_id} = Graph.add_edge(
      graph,
      vertex_id, vertex2_id,
      label: "Edge", color: "green"
    )
  6. Add a cluster containing one or more nodes

    {graph, cluster_id} = Graph.add_cluster(graph, [vertex_id, vertex2_id])

Records

  1. Alias the necessary module for ease of use

    alias Graphvix.Record
  2. Create a simple record that contains only a row of cells

    record = Record.new(Record.row(["a", "b", "c"]))
    • A record with a top-level row can also be created by just passing a list

      record = Record.new(["a", "b", "c"])
  3. Create a record with a single column of cells

    record = Record.new(Record.column(["a", "b", "c"]))
  4. Create a record with nested rows and columns

    import Graphvix.Record, only: [column: 1, row: 1]
    
    record = Record.new(row([
      "a",
      column([
        "b",
        row(["c", "d", "e"]),
        "f"
      ]),
      "g"
    ])
    

Ports

  1. Ports can be attached to record cells by passing a tuple of {port_name, label}

    import Graphvix.Record, only: [column: 1, row: 1]
    
    record = Record.new(row([
      {"port_a", "a"},
      column([
        "b",
        row(["c", {"port_d", "d"}, "e"]),
        "f"
      ]),
      "g"
    ])
    
  2. Edges can be drawn from specific ports on a record

    {graph, record_id} = Graph.add_record(graph, record)
    
    {graph, _edge_id} = Graph.add_edge({record_id, "port_a"}, vertex_id)

HTML Table Records

  1. Alias the necessary modules for ease of use

    alias Graphvix.HTMLRecord
  2. Create a simple table

    record = HTMLRecord.new([
      tr([
        td("a"),
        td("b"),
        td("c")
      ]),
      tr([
        td("d", port: "port_d"),
        td("e"),
        td("f")
      ])
    ])
  3. Or a more complex table

    record = HTMLRecord.new([
      tr([
        td("a", rowspan: 3),
        td("b", colspan: 2),
        td("f", rowspan: 3)
      ]),
      tr([
        td("c"),
        td("d")
      ])
      tr([
        td("e", colspan: 2)
      ])
    ])

Cells can also use the font/2 and br/0 helper methods to add font styling and forced line breaks. See the documentation for Graphvix.HTMLRecord for examples.

Output

  1. Convert the graph to DOT format

    Graph.to_dot(graph)
    """
    digraph G {
      cluster c0 {
        v0 [label="vertex label"]
        v1 [label="my other vertex",color="blue",shape="diamond"]
    
        v0 -> v1 [label="Edge",color="green"]
      }
    }
    """
  2. Save the graph to a .dot file, with an optional filename

    Graph.write(graph, "first_graph") #=> creates "first_graph.dot"
  3. Compile the graph to a .png or .pdf using the dot command

    ## creates first_graph.dot and first_graph.png
    Graph.compile(graph, "first_graph")
    
    ## creates first_graph.dot and first_graph.pdf
    Graph.compile(graph, "first_graph", :pdf)
  4. Compile the graph using the dot command and open the resulting file

    ## creates first_graph.dot and first_graph.pdf; opens first_graph.png
    Graph.graph(graph, "first_graph")
    
    ## creates first_graph.dot and first_graph.pdf; opens first_graph.pdf
    Graph.graph(graph, "first_graph", :pdf)

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Graphviz for Elixir

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