Adding node and link after render

[hurkanakbiyik]

Is that possible to adding nodes and links to graph after renderGraph function?

How can i do that?

var graph = require('ngraph.graph')();
graph.addLink(1, 2);

var renderGraph = require('ngraph.pixel');
var renderer = renderGraph(graph);

//this is not working
graph.addLink(2, 3);