利用泰森多边形剖分算法划分单元格来展示层级数据与数值。单元格大小对应数值，因迭代计算面积可能存在微小近似。
层级结构占比与构成
用在线工具做一张沃罗诺伊树图 →It displays hierarchically structured data and a related quantitative dimension. It is composed of an area divided into small cells, representing the last level of the tree structure, computed using the Voronoi tessellation. The cells’ size depends on the quantitative dimension. the dimensions are calculated iteratively, therefore area could be not fully representative of the mapped value.
在 RAWGraphs 里制作沃罗诺伊树图只要四步：①把 Excel / CSV 表格数据复制粘贴进工具；②在图表列表里选择「Treemap (Voronoi)」；③把左侧的数据字段拖到右侧对应的映射区（如维度、数值、颜色）；④在 Customize 里调颜色与标签，最后导出 SVG 或 PNG，SVG 还能放进 Illustrator 继续精修。全程数据只在浏览器本地处理，不上传。