🍬 Pretty Treemaps

Looking to run this for Go coverage? Check https://github.com/nikolaydubina/go-cover-treemap

Uses "Squarified Treemaps" (Mark Bruls, Kees Huizing, and Jarke J. van Wijk., 2000) algorithm.

$ go install github.com/nikolaydubina/treemap/cmd/treemap@latest 
$ echo '
Africa/Algeria,33333216,72
Africa/Angola,12420476,42
Africa/Benin,8078314,56
...
' | treemap > out.svg

Adjusting size

$ ... | treemap -w 1080 -h 360 > out.svg

$ ... | treemap -w 1080 -h 1080 > out.svg

Imputing heat

$ ... | treemap -impute-heat > out.svg

Different colorscheme

$ ... | treemap -color RdYlGn > out.svg

Tree-Hue coloring when there is no heat

$ ... | treemap -color balanced > out.svg

Without color

$ ... | treemap -color none > out.svg

Format

Size and heat is optional.

</ delimitered path>,<size>,<heat>

Algorithms

• Squarified algorithm for treemap layout problem. This is very common algorithm used in Plotly and most of visualization packages. "Squarified Treemaps", Mark Bruls, Kees Huizing, and Jarke J. van Wijk, 2000
• Tree-Hue Color algorithm for generating colors for nodes in treemap. The idea is to represent hierarchical structure by recursively painting similar hue to subtrees. Nikolay Dubina, 2021

Contributions

Welcomed!

References

• Plotly treemaps: https://plotly.com/python/treemaps/
• go-colorful: https://github.com/lucasb-eyer/go-colorful
• D3 treemap is using Squerified: https://github.com/d3/d3-hierarchy
• Interactive treemap: https://github.com/vasturiano/treemap-chart
• Squerified in Rust: https://github.com/bacongobbler/treemap-rs
• Squerified in JavaScript: https://github.com/clementbat/treemap
• Squerified in Python: https://github.com/laserson/squarify
• Treemap Go tool: https://github.com/willpoint/treemap
• Plotly color scales: https://plotly.com/python/builtin-colorscales
• Plotly color scales source: https://github.com/plotly/plotly.py/blob/master/packages/python/plotly/_plotly_utils/colors/colorbrewer.py
• Colorbrewer project, that is used in Plotly: http://colorbrewer2.org

Appendix A: Long Roots

When roots have one child multiple times it takes extra vertical space, which is very useful for narrow final dimensions.

Can collapse them into one node

Long roots without collapsing somewhere deep inside

Long roots with collapsing somewhere deep inside

Appendix B: Less Illustrative Examples

Large dimensions and large tree (e.g. github.com/golang/go)

$ ... | treemap -w 4096 -h 4096 > out.svg