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Graph drawing library for JavaScript
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README.md

VivaGraphJS - JavaScript Graph Drawing Library

VivaGraphJS is a free graph drawing library for JavaScript. It is designed to be extensible and to support different rendering engines and layout algorithms. At the moment it supports rendering graphs using either SVG or CSS formats. Layout algorithms currently implemented are:

  • Force Directed - based on Barnes-Hut simulation and optimized for JavaScript language this algorithm gives N * lg(N) + V performance per iteration.
  • PDF download GEM - Graph Embedder algorithm created by Arne Frick, Andreas Ludwig and Heiko Mehldau. Estimated compleixity of this algorithm is O(|V|^3) - though I must have made a mistake somewhere, because force directed algorithm almost always produces better results faster. This algorithm is included to demonstrate how one can implement a new layout algorithm.

Library provides API which tracks graph changes and reflect changes on the rendering surface accordingly.

Enough talking. Show me the demo!

To start using the library include vivagraph.js script from the dist folder. The following code is the minimum required to render a graph with two nodes and one edge:

var graph = Viva.Graph.graph();
graph.addLink(1, 2);

var renderer = Viva.Graph.View.renderer(graph);
renderer.run();

This will produce the following layout:

Simple graph

The code above adds a link to the graph between nodes 1 and 2. Since nodes are not yet in the graph they will be created. It's equivalent to

var graph = Viva.Graph.graph();
graph.addNode(1);
graph.addNode(2);
graph.addLink(1, 2);

var renderer = Viva.Graph.View.renderer(graph);
renderer.run();

Customization

VivaGraphJS is all about customization. You can easily change nodes and links appearance, switch layouting algorithm and medium used to display elements of the graph. For example to use CSS-based rendering (instead of default SVG) the following code is required:

var graph = Viva.Graph.graph();
graph.addLink(1, 2);

var graphics = Viva.Graph.View.cssGraphics();

var renderer = Viva.Graph.View.renderer(graph, 
    {
        graphics : graphics
    });
renderer.run();

graphics class is responsible for rendering nodes and links on the page. And renderer orchestrates the process. To change nodes appearance tell graphics how to represent them. Here is an example of graph with six people whom I follow at github:

var graph = Viva.Graph.graph();

// Construct the graph
graph.addNode('anvaka', {url : 'https://secure.gravatar.com/avatar/91bad8ceeec43ae303790f8fe238164b'});
graph.addNode('manunt', {url : 'https://secure.gravatar.com/avatar/c81bfc2cf23958504617dd4fada3afa8'});
graph.addNode('thlorenz', {url : 'https://secure.gravatar.com/avatar/1c9054d6242bffd5fd25ec652a2b79cc'});
graph.addNode('bling', {url : 'https://secure.gravatar.com/avatar/24a5b6e62e9a486743a71e0a0a4f71af'});
graph.addNode('diyan', {url : 'https://secure.gravatar.com/avatar/01bce7702975191fdc402565bd1045a8?'});
graph.addNode('pocheptsov', {url : 'https://secure.gravatar.com/avatar/13da974fc9716b42f5d62e3c8056c718'});
graph.addNode('dimapasko', {url : 'https://secure.gravatar.com/avatar/8e587a4232502a9f1ca14e2810e3c3dd'});

graph.addLink('anvaka', 'manunt');
graph.addLink('anvaka', 'thlorenz');
graph.addLink('anvaka', 'bling');
graph.addLink('anvaka', 'diyan');
graph.addLink('anvaka', 'pocheptsov');
graph.addLink('anvaka', 'dimapasko');

// Set custom nodes appearance
var graphics = Viva.Graph.View.svgGraphics();
graphics.node(function(node) {
       // The function is called every time renderer needs a ui to display node
       return Viva.Graph.svg('image')
             .attr('width', 24)
             .attr('height', 24)
             .link(node.data.url); // node.data holds custom object passed to graph.addNode();
    })
    .placeNode(function(nodeUI, pos){
        // Shift image to let links go to the center:
        nodeUI.attr('x', pos.x - 12).attr('y', pos.y - 12);
    });

var renderer = Viva.Graph.View.renderer(graph, 
    {
        graphics : graphics
    });
renderer.run();

The result is:

Custom nodes

Tuning layout algorithm

Graphs vary by their nature. Some graphs has hundreds of nodes and few edges (or links), others connect every node with each other. To get the best layout tuning is usually required. Consider the following example:

var graphGenerator = Viva.Graph.generator();
var graph = graphGenerator.grid(3, 3);
var renderer = Viva.Graph.View.renderer(graph);
renderer.run();

Graph generators are part of the library, which can produce classic graphs. grid generator creates a grid with given number of columns and rows. But with default parameters the rendering is pretty ugly:

Grid 3x3 bad

Let's tweak original code:

var graphGenerator = Viva.Graph.generator();
var graph = graphGenerator.grid(3, 3);

var layout = Viva.Graph.Layout.forceDirected(graph, {
    springLength : 10,
    springCoeff : 0.0005,
    dragCoeff : 0.02,
    gravity : -1.2
});

var renderer = Viva.Graph.View.renderer(graph, {
    layout : layout
});
renderer.run();

Now result is much better:

Grid 3x3

Tuning layout algorithm is definitely one of the hardest part of using this library. It has to be improved in future to simplify usage. Each of the force directed algorithm parameters are described in the source code.

TODO: Add more examples and library API to wiki

I need your feedback

Disclaimer: I wrote this library to learn JavaScript. By no means I pretend to be an expert in the language and choosen approach to design may not be the optimal. I would love to hear your feedback and suggestions.

Though I implemented this library from scratch, I went through many existing libraries to pick the best (at my view) out of them. If you are evaluating libraries for your project make sure to check them out as well:

My goal is to create highly performant javascript library which serves in the field of graph drawing. To certain extent I ahcieved it. But I have no doubt there is much more to improve here.

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