javascript - How do I set the focal node in a D3.js Force Directed Graph? -


i have data set defines number of nodes use in force directed graph. looks like...

  var nodeset = [     {id: "n1", name: "node 1", type: "type 1", hlink: "http://www.if4it.com"},     {id: "n2", name: "node 2", type: "type 3", hlink: "http://www.if4it.com/glossary.html"},     {id: "n3", name: "node 3", type: "type 4", hlink: "http://www.if4it.com/resources.html"},     {id: "n4", name: "node 4", type: "type 5", hlink: "http://www.if4it.com/taxonomy.html"},     {id: "n5", name: "node 5", type: "type 1", hlink: "http://www.if4it.com/disciplines.html"}   ];

how tell force.layout in d3.js library use "node 1" of id = "n1" primary root or focal node?

if want root node can have root property in object , set true, treat node separately. can set root center. here how did (d3 + prototype - @ time - switching d3+jquery+underscore):

getcenter: function() {     var center = {         x : this.width / 2,         y : this.height / 2     };     return center; }  //later in init method: var first = {                 id : id,                 name : name,                 x : this.getcenter().x,                 y : this.getcenter().y,                 root : true,                 //other properties             };  //later in redraw() or other methods might employ... //try find root node later in code using like: var rootnode = this.nodes.detect(function(node) {     return node.root; });  //do root node after have detected it... if (rootnode) {     rootnode.x = rootnode.px = this.getcenter().x;     rootnode.y = rootnode.py = this.getcenter().y;     //some other stuff... }

this how have done it. it's not clear me links in example... little bit puzzled. notice, force directed layout or more complicated animations need use d3+something else (prototype, jquery, underscore) simple methods detect or include or other similar ruby style methods.


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