dot

@thi.ng/dot

This project is part of the @thi.ng/umbrella monorepo.

About

Graphviz DOM abstraction as vanilla JS objects & serialization to DOT format. Provides several interfaces covering a large subset of GraphViz options and functions to serialize whole graphs (incl. subgraphs), nodes or edges. Supports both directed and undirected graphs.

Please see the GraphViz DOT guide for further details.

Installation

yarn add @thi.ng/dot

Dependencies

• @thi.ng/api
• @thi.ng/checks

Usage examples

The source code of this example is also available in /test/example.ts.

import * as dot from "@thi.ng/dot";

// node type style presets
const terminal = {
    color: "black",
    fontcolor: "white",
};

// operator nodes use "Mrecord" shape
// with input and output port declarations
const operator = {
    fillcolor: "yellow",
    shape: "Mrecord",
    ins: { 0: "a", 1: "b" },
    outs: { "out": "out" }
};

dot.serializeGraph({
    directed: true, // default
    // graph attributes
    attribs: {
        rankdir: "LR",
        fontname: "Inconsolata",
        fontsize: 9,
        fontcolor: "gray",
        label: "Generated with @thi.ng/dot",
        labeljust: "l",
        labelloc: "b",
        // node defaults
        node: {
            style: "filled",
            fontname: "Inconsolata",
            fontsize: 11
        },
        // edge defaults
        edge: {
            arrowsize: 0.75,
            fontname: "Inconsolata",
            fontsize: 9
        }
    },
    // graph nodes (the keys are used as node IDs)
    // use spread operator to inject style presets
    nodes: {
        x:   { ...terminal, label: "x (12)" },
        y:   { ...terminal, label: "y (23)" },
        res: { ...terminal, label: "result (8050)", peripheries: 2 },
        op1: { ...operator, fillcolor: "green", label: "op1\n(+)" },
        op2: { ...operator, label: "op2\n(*)" },
    },
    // graph edges (w/ optional ports & extra attribs)
    edges: [
        { src: "x", dest: "op1", destPort: 1 },
        { src: "y", dest: "op1", destPort: 0 },
        { src: "y", dest: "op2", destPort: 0, label: "xform", color: "blue" },
        { src: "op1", srcPort: "out", dest: "op2", destPort: 1 },
        { src: "op2", srcPort: "out", dest: "res"},
    ]
});

Resulting output:

digraph g {
rankdir="LR";
node[style="filled", fontname="Inconsolata", fontsize="11"];
edge[arrowsize="0.75", fontname="Inconsolata", fontsize="9"];
"x"[color="black", fontcolor="white", label="x (12)"];
"y"[color="black", fontcolor="white", label="y (23)"];
"op1"[fillcolor="yellow", shape=Mrecord, label="{ <0> a | <1> b } | op1\n(+) | { <out> out }"];
"op2"[fillcolor="yellow", shape=Mrecord, label="{ <0> a | <1> b } | op2\n(*) | { <out> out }"];
"res"[color="black", fontcolor="white", label="res (805)", peripheries="2"];
"x" -> "op1":"1";
"y" -> "op1":"0";
"op1":"out" -> "op2":"1";
"y" -> "op2":"0"[label="xform", color="blue"];
"op2":"out" -> "res";
}

Authors

• Karsten Schmidt

License

© 2018 Karsten Schmidt // Apache Software License 2.0