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Show HN: Infinite canvas notes in the non-Euclidean Poincaré disk

https://uonr.github.io/poincake/
22•uonr•4d ago
Hi!

This is an infinite canvas note-taking tool where notes are laid out in a non-Euclidean, hyperbolic geometric space. As you drag and navigate through the view, you’ll experience a unique fluid distortion that naturally leverages your brain's spatial memory.

I’ve been obsessed with the concept of space in HCI for years. Many modern UI patterns are essentially workarounds for the lack of screen real estate. While researching zoom-based UIs a while back, I stumbled upon old HCI papers that used the Poincaré disk model of the hyperbolic plane to organize data. It elegantly projects an infinite space into a finite disk, keeping everything contextually visible.

I wanted to build an experimental app around this concept years ago, but the non-Euclidean math was a significant roadblock. Recently, I decided to give it a shot with the help of LLMs. It turns out that LLMs can handle the mathematical heavy lifting quite well, specifically in designing the coordinate systems and optimization algorithms, provided that you guide them with a solid architectural design.

This is still an experimental demo, but I hope it leaves an impression. I’d love to know if you find this paradigm practical for organizing your thoughts.

Comments

sys-ronin•3d ago
Nice concept. really unique experience. so smooth.
isoprophlex•54m ago
It's Greg Egan's notebook!
gatane•38m ago
You might as well look at HyperRogue, where the whole game happens to be on the same model.
OneDeuxTriSeiGo•23m ago
I really like the approach but it'd certainly be nice to be able to use alternate topologies.

Also it'd be nice if there was an underlying grid plotting the metric/distance function to help conceptualize distance/relationships better when you get to the edges.

levmiseri•19m ago
Loving the smoothness of this. One concerning thing is overlapping notes – I don't want to be fucking around with trying to move the canvas just right to read a note under another note and there doesn't seem to be any other simple mechanism to resolve this (especially for larger blocks/images). The 'untangle' feature doesn't really solve this.

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Show HN: Infinite canvas notes in the non-Euclidean Poincaré disk

https://uonr.github.io/poincake/
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