World Countries Tree
This interactive treemap displays the hierarchical structure of Tsinghua University, showing its schools and their constituent departments. The visualization uses a horizontal tree layout with curved links, rendered as SVG paths. It reads from a local `data.json` file, and the code uses D3 v5’s `tree`, `hierarchy`, `linkHorizontal`, and `zoom` APIs to compute the layout and enable pan/zoom functionality. Text labels adjust their font size based on depth level.