var cytoscape = require('cytoscape');
var cydagre = require('cytoscape-dagre');

cydagre( cytoscape ); // register extension

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

var defaults = {
  // dagre algo options, uses default value on undefined
  nodeSep: undefined, // the separation between adjacent nodes in the same rank
  edgeSep: undefined, // the separation between adjacent edges in the same rank
  rankSep: undefined, // the separation between adjacent nodes in the same rank
  rankDir: undefined, // 'TB' for top to bottom flow, 'LR' for left to right
  minLen: function( edge ){ return 1; }, // number of ranks to keep between the source and target of the edge
  edgeWeight: function( edge ){ return 1; }, // higher weight edges are generally made shorter and straighter than lower weight edges

  // general layout options
  fit: true, // whether to fit to viewport
  padding: 30, // fit padding
  animate: false, // whether to transition the node positions
  animationDuration: 500, // duration of animation in ms if enabled
  animationEasing: undefined, // easing of animation if enabled
  boundingBox: undefined, // constrain layout bounds; { x1, y1, x2, y2 } or { x1, y1, w, h }
  ready: function(){}, // on layoutready
  stop: function(){} // on layoutstop
};