1.0.19 • Public • Published


Build Status License: GPL v3 semantic-release Conventional Commits


Graph theory (a.k.a. network) library for analysis and visualisation

Visit our webpage to see the detailed docs and examples.


ccNetViz is a lightweight, high performance javascript library for large network graphs (see graph theory) visualization using WebGL. It enables custom styling of nodes and edges in css like way, curve edges, dynamic changes of the network, a number of layout settings (including force-directed, spectral, hierarchical, circular, versinus, grid and random) and basic graph interactivity. Used for example by Cell Collective project. ccNetViz is open source library available under GPLv3 License.

Basic Example

<!DOCTYPE html>
    <title>ccNetViz example</title>
    <style type="text/css">
      #container {
        width: 500px;
        height: 500px;
    <script src="lib/ccNetViz.js"></script> 
    <canvas id="container" />
      var graph = new ccNetViz(document.getElementById('container'), {
        styles: {
          node: { texture: 'images/node.png', label: { hideSize: 16 } },
          edge: { arrow: { texture: 'images/arrow.png' } },
      var nodes = [{ label: 'Hello' }, { label: 'World' }, { label: '!' }];
      var edges = [
        { source: nodes[0], target: nodes[1] },
        { source: nodes[1], target: nodes[2] },
        { source: nodes[2], target: nodes[1] },
      graph.set(nodes, edges, 'force').then(() => {

In-built support for the multiple layouts

Recommended layout is Force based.

Inbuilt support for multiple layouts such as the Force, Hierarchical, Circular, Spectral, Hive, Grid, Versinus.

Inbuilt support for two modifications of Tree layout.

If you want to use one of our in-built layout ( see the for list of all available ones ), pass it as second parameter into the set function such as:

graph.set(nodes, edges, 'force'); //set the force layout

Advanced Examples


ccNetViz(element, options)

Creates new ccNetViz graph renderer attached to canvas element specified as first argument, styled with styles defined in styles property of options parameter.

Example options

  styles: {
    background: { color: "rgb(0, 0, 0)" },  //background color of canvas, default: "rgb(255, 255, 255)"
    node: { //predefined style
      minSize: 8,   //minimum size of node representation in pixels, default: 6
      maxSize: 16,    //maximum size of node representation in pixels, default: 16
      color: "rgb(255, 0, 0)",  //node color (combined with node image), default: "rgb(255, 255, 255)"
      texture: "images/circle.png",   //node image
      label: {
        backgroundColor: "rgb(255,255,0)", //default: "rgb(255, 255, 255)"
        borderColor: "rgb(0,0,0)",
        color: "rgb(120, 0, 0)",  //label color, default: "rgb(120, 120, 120)"
        font: { //label font
          size: 15,
          family: "Arial, Helvetica, sans-serif", //default: "sans-serif"
          weight: "normal|bold|italic", //default weight: normal
          strokeText: false, //default: false
          alignment: "left|right|center"  //default alignment: left
    edge: {   //predefined style
      width: 2,   //edge width in pixels, default: 1
      color: "rgb(86, 86, 86)",   //edge color, default: "rgb(204, 204, 204)"
      arrow: {
        minSize: 6,   //minimum size of arrow in pixels, default: 6
        maxSize: 12,  //maximum size of arrow, default: 12
        aspect: 2,  //aspect of arrow image, default: 1
        texture: "images/arrow.png",  //arrow image
        hideSize: 2   //minimum size of arrow to be displayed
      type: "line"    //type of edge (supported types - "line", "dashed", "dotted", "chain-dotted")
      // edge animation configuration
      animateType: 'gradient', // type of animation: "basic", "gradient", "none"
      animateSpeed: 2,
      animateEase: 'sin-out', // default is "linear", refer to line_animation_complex in examples
      animateColor: 'rgb(240, 80, 100)', // animation color
    nodeBlue: {   //custom style
      color: "rgb(0, 0, 255)"
    nodeGiant: {  //custom style
      minSize: 16
    nodeWithSmallBlueLabel: {   //custom style
      label: {
        color: "rgb(0, 0, 255)",
        font: { //label font
          type: "Arial, Helvetica, sans-serif",
          size: 11
    nodeWithSDFFont: {   //custom style with rendering SDF fonts
      label: {
        color: "rgb(0, 0, 255)",
        font: {
          type: "sdf",
          texture: "fonts/OpenSans-Regular.png",    //SDF (Signed distance field) texture
          metrics: "fonts/OpenSans-Regular.json",   //SDF metrics
          size: 15,
          outlineColor: "rgb(0,255,255)"            //color of outline - optional ( if it is not setted - background color would be used )
    edgeWideYellow: {   //custom style
      width: 4,
      color: "rgb(255, 255, 0)"
    edgeWithWhiteArrow: {   //custom style
      arrow: {
        color: "rgb(255, 255, 255)"
  onChangeViewport: function(viewport){}, //called every time viewport changes
  onLoad: function(){}, //called when graph loaded
  getNodesCount(){}, //callback to use if you want to force nodes count into this library (used to calculate curve excentricity and other built in options), expecting number as return value
  getEdgesCount(){}, //callback to use if you want to force edges count into this library (used to calculate curve excentricity and other built in options), expecting number as return value
  onDrag: function(viewport){}, //drag event, disable original event in case of return false
  onZoom: function(viewport){}, //zoom event, disable original event in case of return false
  onClick: function(){}, //called on click on graph
  onDblClick: function(){}, //called on double click on graph
  passiveEvts: false, //make mouse events passive for performance reasons ( default false )
  bidirectional: "curves" // ["curves"|"overlap"] how to show bidirectional nodes ( default "curves" ), if overlap then the edges are shown like line with two arrows

There are three predefined styles:

  • node: default style used for all nodes
  • edge: default style used for all edges
  • background: default style used for canvas background

All default property values of these styles can be overriden (as in example above).

Besides overriding default styles (used for all nodes / edges) it is possible to define custom styles (like "nodeBlue" etc. in example above) and then use this style just for specified subsets of nodes / edges (see bellow how to define style for given node / edge). Property values specified for given custom style override default style values.

All of our texts are rendered with as a Signed Distance Field fonts which make them high qualty with keeping the performance high.

set(nodes, edges, layout, layout_options = {})

Sets the data to be displayed by given ccNetViz instance. "nodes" argument is an array of objects describing graph nodes. Each node can have following properties:

  • label (optional): text label for given node (displayed if node labels are enabled by node label style)
  • x, y (optional): predefined position for given node (if "layout" argument is not specified these positions will be used for graph layout)
  • color (optional): ccNetViz.color object defining color for this given node (use this in case of coloring each node separately, for coloring groups of nodes use color property of node style)
  • style (optional): name of custom style class used for this node (for example: "nodeBlue" see above section for how to define custom styles)

"edges" argument is an array of objects describing directed graph edges. Each edge has following properties:

  • source: pointer to given source node object
  • target: pointer to given target node object
  • style (optional): name of custom style class used for this edge

Optional "layout" argument defines layout used to render this graph. Possible values: circular", "force", "grid", "hierarchical", "hierarchical2", "hive", "random", "spectral", "spectral2", "tree", "treeT", "versinus". If not specified, positions are taken from each node x, y properties.

Special layout options, such as margin and flip, are routed through the layout_options argument. See Advanced circular layout for an example of further layout options.

find(x, y, radius, nodes, edges)

findArea(x1, y1, x2, y2, nodes, edges)


Renders current data.


Adjust graph for current canvas size.


Reset zoom and panning.


Set graph viewport.

"viewport" argument is an object with keys to modify (all of keys are optional)

  "x": 0.123, //x offset of viewport (number in range 0-1), optional
  "y": 0.326, //y offset of viewport (number in range 0-1), optional
  "size": 0.98, //size value of viewport (number in range 0-1) - the amount of original screen that is visible, optional


Get number of nodes


Get number of edges


Clear graph and remove internal events from DOM.


Property to access nodes data of given graph. Use this just to read current values, for modification use "set" method instead.


Property to access edges data of given graph. Use this just to read current values, for modification use "set" method instead.

Plugin's Documentation

Development in ccNetViz

Please follow the below instructions to get started with development in ccNetViz:

You need to have Node and yarn .

  1. Clone the repository.
  2. Run yarn install inside the cloned repository to install dependencies.
  3. Run yarn dev and go to http://localhost:8080. From here go to any of the examples or tests.
  4. Making any changes to the src/ directory will trigger an auto reload and build of the webpage.
  5. Finally when you are done with the changes run yarn build to create the final build.

Note: if your having any problem with seeing changes, clear the browser cache.


If you are looking to contribute to ccNetViz, fork the ccNetViz repo, follow all the above steps (i.e. Development in ccNetViz), commit the changes(ccNetViz follows the conventional commits specification, please adhere to this format of commits in your Pull Requests) to your fork and make a pull request to ccNetViz.

Developing new layouts

We recommend adding new/other layouts to src/layouts/ directory and allowing its usage by routing in src/layouts/layouts.js like implemented to the builtin layouts.

See the wiki pages for more information on the layouts implemented and that are possible.

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npm i ccnetviz

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