Voronoi Treemap
d3-voronoi-treemap
https://gyazo.com/1803e4213668764da5ec9e1bccdc9037
https://github.com/Kcnarf/d3-voronoi-treemap
https://gyazo.com/3de247efd7781531b617484631c2be0b
Voronoi Treemap | Tableau Exchange
論文レビュー StoryGem: Voronoi treemap Approach for Semantics-Preserving Text Visualization