Awesome

🍬 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

example

Adjusting size

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

example-narrow

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

example-square

Imputing heat

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

example-narrow

Different colorscheme

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

example-RdYlGn

Tree-Hue coloring when there is no heat

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

example-balanced

Without color

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

example-no-color

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.

example-long-roots

Can collapse them into one node example-long-roots-collapse

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

example-large