SQUARIFIEDPLUS
Implementation of the Squarified+ algorithm. It is described in:
Cesarano A, Ferrucci F, Torre M. A heuristic extending the Squarified treemapping algorithm. arXiv preprint arXiv:1609.00754. 2016 Sep 2.
A heuristic extending the squarified algorithm with better aspect ratios and higher homogeneity among items.
Complexity: O(n), where n is the number of nodes in the tree.