Crate dot_graph

A library for generating Graphviz DOT language files.

The very basic three parts of a DOT file and in this library is Graph, Node and Edge. Graph is the entry point of the library. You could generate an empty graph .dot file by simply use:

use dot_graph::{Graph, Kind};

let graph = Graph::new("empty_graph", Kind::Digraph);

let dot_string = graph.to_dot_string().unwrap();

assert_eq!(dot_string,
   r#"digraph empty_graph {
}
"#);

In order to add some basic nodes and edges:

use dot_graph::{Graph, Kind, Node, Edge};

let mut graph = Graph::new("single_edge", Kind::Digraph);

graph.add_node(Node::new("N0"));
graph.add_node(Node::new("N1"));
graph.add_edge(Edge::new("N0", "N1", "E"));

let dot_string = graph.to_dot_string().unwrap();

assert_eq!(dot_string,
r#"digraph single_edge {
    "N0"[label="N0"];
    "N1"[label="N1"];
    "N0" -> "N1"[label="E"];
}
"#);

If you want add some more attributes, like style, arrow, color, you could call these methods in a chain, like:

use dot_graph::{Graph, Kind, Node, Edge, Style};

let mut graph = Graph::new("single_edge", Kind::Digraph);

graph.add_node(Node::new("N0"));
graph.add_node(Node::new("N1"));
graph.add_edge(Edge::new("N0", "N1", "E").style(Style::Bold).color(Some("red")));

assert_eq!(graph.to_dot_string().unwrap(),
r#"digraph single_edge {
    "N0"[label="N0"];
    "N1"[label="N1"];
    "N0" -> "N1"[label="E"][style="bold"][color="red"];
}
"#);

After version 0.2.1, dot_graph support subgraph generation, for example:

#[test]
fn test_subgraph() {
    let mut graph = Graph::new("di", Kind::Digraph);
    let mut c1 = Subgraph::new("cluster_0").label("");
    c1.add_node(Node::new("N0"));
    c1.add_node(Node::new("N1"));
    let mut c2 = Subgraph::new("cluster_1").label("");
    c2.add_node(Node::new("N2"));
    c2.add_node(Node::new("N3"));
    graph.add_subgraph(c1);
    graph.add_subgraph(c2);
    graph.add_edge(Edge::new("N0", "N1", ""));
    graph.add_edge(Edge::new("N0", "N2", ""));
    graph.add_edge(Edge::new("N1", "N3", ""));
    graph.add_edge(Edge::new("N2", "N3", ""));
    

    assert_eq!(graph.to_dot_string().unwrap(),
r#"digraph di {
subgraph cluster_0 {
    label="";
    "N0"[label="N0"];
    "N1"[label="N1"];
}
subgraph cluster_1 {
    label="";
    "N2"[label="N2"];
    "N3"[label="N3"];
}
"N0" -> "N1"[label=""];
"N0" -> "N2"[label=""];
"N1" -> "N3"[label=""];
"N2" -> "N3"[label=""];
}
"#);
}

For more examples, please check the tests.

The library is under active development, we’ll include more dot attributes in the future.

References

• Graphviz

• DOT language

Structs

Arrow

This structure holds all information that can describe an arrow connected to either start or end of an edge.

Edge

Graph’s edge.

Graph

Entry point of this library, use to_dot_string to get the string output.

Node

Graph’s node

Subgraph

Graph’s subgraph

Enums

ArrowShape

This enumeration represents all possible arrow edge as defined in grapviz documentation.

Fill

Arrow modifier that determines if the shape is empty or filled.

Kind

Graph kind determines if digraph or graph is used as keyword for the graph.

Side

Arrow modifier that determines if the shape is clipped. For example Side::Left means only left side is visible.

Style

The style for a node or edge. See http://graphviz.org/doc/info/attrs.html#k:style for descriptions. Note that some of these are not valid for edges.