cytoscape-elk

Description

The elk layout algorithm adapter for Cytoscape.js (demo)

This discrete layout creates good results for most graphs and it supports compound nodes.

Dependencies

• Cytoscape.js ^3.2.0
• elkjs ^0.3.0

Usage instructions

Download the library:

• via npm: npm install cytoscape-elk,
• via bower: bower install cytoscape-elk, or
• 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 elk from 'cytoscape-elk';

cytoscape.use( elk );

CommonJS require:

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

cytoscape.use( elk ); // register extension

AMD:

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

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

API

var options = {
  nodeDimensionsIncludeLabels: false, // Boolean which changes whether label dimensions are included when calculating node dimensions
  fit: true, // Whether to fit
  padding: 20, // Padding on fit
  animate: false, // Whether to transition the node positions
  animateFilter: function( node, i ){ return true; }, // Whether to animate specific nodes when animation is on; non-animated nodes immediately go to their final positions
  animationDuration: 500, // Duration of animation in ms if enabled
  animationEasing: undefined, // Easing of animation if enabled
  transform: function( node, pos ){ return pos; }, // A function that applies a transform to the final node position
  ready: undefined, // Callback on layoutready
  stop: undefined, // Callback on layoutstop
  elk: {
    // All options are available at http://www.eclipse.org/elk/reference.html
    // 'org.eclipse.elk.' can be dropped from the Identifier
    // Or look at demo.html for an example.
    // Enums use the name of the enum e.g.
    // 'searchOrder': 'DFS'
  },
  priority: function( edge ){ return null; }, // Edges with a non-nil value are skipped when geedy edge cycle breaking is enabled
};

cy.layout( options ).run();

Build targets

• npm run test : Run Mocha tests in ./test
• npm run build : Build ./src/** into cytoscape-elk.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.

Publishing instructions

This project is set up to automatically be published to npm and bower. 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 .
6. If publishing to bower for the first time, you'll need to run bower register cytoscape-elk https://github.com/jfstephe/cytoscape.js-elk.git