function n(n,i){function o(n,t){var r=n.children,u=n._tree;if(r&&(i=r.length)){for(var i,a,s,l=r[0],f=l,h=-1;++h<i;)s=r[h],o(s,a),f=c(s,a,f),a=s;vi(n);var g=.5*(l._tree.prelim+s._tree.prelim);t?(u.prelim=t._tree.prelim+e(n,t),u.mod=u.prelim-g):u.prelim=g}else t&&(u.prelim=t._tree.prelim+e(n,t))}function a(n,t){n.x=n._tree.prelim+t;var e=n.children;if(e&&(r=e.length)){var r,u=-1;for(t+=n._tree.mod;++u<r;)a(e[u],t)}}function c(n,t,r){if(t){for(var u,i=n,o=n,a=t,c=n.parent.children[0],s=i._tree.mod...

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github.com/philhofer/fwd
https://github.com/philhofer/fwd
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Copyright (c) 2014-2015, Philip Hofer