src/bilevel-sunburst.js
function(p) {

            var self = this;

            if (p.depth > 1) p = p.parent;
            // no children
            if (!p.children) return;

            //console.log("zoom in p.value = " + p.value);
            //console.log("zoom in p.name = " + p.name);
            self.updateExplanation(p.value, p.name);

            self.zoom(p, p);
        }
function(p) {

            var self = this;

            if (p.depth > 1) p = p.parent;
            // no children
            if (!p.children) return;

            //console.log("zoom in p.value = " + p.value);
            //console.log("zoom in p.name = " + p.name);
            self.updateExplanation(p.value, p.name);

            self.zoom(p, p);
        }
function ( p ) { var self = this ; if ( p . depth > 1 ) p = p . parent ; // no children if ( ! p . children ) return ; //console.log("zoom in p.value = " + p.value); //console.log("zoom in p.name = " + p.name); self . updateExplanation ( p . value , p . name ) ; self . zoom ( p , p ) ; }
handle zoomin, it happen on arcs.
handle zoomin it happen on arcs .