cytoscape-multilayer

Description

This is a layout extension for Cytoscape.js.

The multilayer layout organises the graph using a DAG (directed acyclic graph) system, written by Zachary Bolt. Contributions from [Caleb Chase] (http://www.linkedin.com/in/calebchase03) and [Mark Barnes] (https://www.linkedin.com/in/mark-barnes-243b1529/) . It is especially suitable for DAGs and trees with large numbers of children. For more information, please refer to its Dagre's documentation. It has been structured to also group children into boxes and add a maximum width for the graph. In addition this accepts compound nodes. The first child of a compound node parent will float above the rest. Adjust the nodeXSep and nodeYSep options to fit.

Dependencies

• Cytoscape.js ^3.2.0
• potpackweighted ^1.0.2

Usage instructions

Download the library:

• via npm: npm install cytoscape-multilayer,
• via direct download in the repository (probably from a tag).

Import the library as appropriate for your project:

ES import:

import cytoscape from 'cytoscape';
import multilayer from 'cytoscape-multilayer';

cytoscape.use( multilayer );

CommonJS require:

let cytoscape = require('cytoscape');
let multilayer = require('cytoscape-multilayer');

cytoscape.use( multilayer ); // register extension

AMD:

require(['cytoscape', 'cytoscape-multilayer'], function( cytoscape, multilayer ){
  multilayer( cytoscape ); // register extension
});

Plain HTML/JS has the extension registered for you automatically, because no require() is needed.

API

Call the layout, e.g. cy.layout({ name: 'multilayer', ... }).run(), with options:

var defaults = {
  // multilayer algo options, uses default value on undefined
  nodeXSep: 200, // the X axis space between adjacent nodes in the same rank
  nodeYSep: 100, // the Y axis space between adjacent nodes in the same rank
  groupSep: 150, // the space between adjacent parent/children groups
  layoutWidth: 6000, //the maximum width of the layout
  weightFunction: function (a, b) {if(b == undefined && a == undefined) return 0; if (b._private.data.weight == undefined) b._private.data.weight = 0; if (a._private.data.weight == undefined) a._private.data.weight = 0; return b._private.data.weight - a._private.data.weight;}, //formula applied to each node to organize them by weight.  currently has error checking to avoid undefined errors.
};

Build targets

• npm run test : Run Mocha tests in ./test
• npm run build : Build ./src/** into cytoscape-multilayer.js
• npm run watch : Automatically build on changes with live reloading (N.b. you must already have an HTTP server running)
• npm run dev : Automatically build on changes with live reloading with webpack dev server
• npm run lint : Run eslint on the source

N.b. all builds use babel, so modern ES features can be used in the src.

Development usage from another package

• cd my-other-package

• npm install --save <path-to-cytoscape-multilayer>

  This creates a link in my-other-package to the local version of cytoscape-multilayer.

• Modify cytoscape-multilayer to add features/fix bugs

• npm run build

  To rebuild the cytoscape-multilayer.js library - my-other-package automatically picks up the updated library.

• Alternatively run npm run watch in cytoscape-multilayer.js to automatically rebuild on every file save.

Publishing instructions

This project is set up to automatically be published to npm. To publish:

1. Build the extension : npm run build:release
2. Commit the build : git commit -am "Build for release"
3. Bump the version number and tag: npm version major|minor|patch
4. Push to origin: git push && git push --tags
5. Publish to npm: npm publish .