Penrose – Penrose

• penrose

  21 6,611 9.2 TypeScript

  Create beautiful diagrams just by typing notation in plain text.

  

By the way, just for clarity, note that the comments in this subthread were written before we updated the random seed for that example to result in a much better diagram: https://github.com/penrose/penrose/pull/1700

• d2

  92 15,837 9.8 Go

  D2 is a modern diagram scripting language that turns text to diagrams.

  

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• pikchr

  3 103 7.5 C

  Mirror for Pikchr

• diagrams

  2 0 7.5 Python

Yeah :( To be honest, I think we got a bit overeager about this one, since none of us on the project are chemistry experts. At least for the front page, we should probably replace that with a different diagram from our registry.

I think this is actually a fairly deep issue with our approach where we try to express everything in terms of numerical optimization, pairwise energies on shapes, etc. Especially since Style is not a Turing-complete programming language and also doesn't support calling out to existing libraries written in, e.g., JavaScript, there isn't a way to do actually-correct layout of the caffeine molecule, so instead we do the "lazy" thing and just try to make the atoms not overlap. To anyone who actually knows what a caffeine molecule looks like, obviously this looks ridiculous.

In the same vein as the other HN comment about separation of substance and style, I think we could do a much better job on chemistry diagrams by actually placing the atoms where they should be in 3D space, then projecting onto a 2D SVG diagram. To illustrate what I mean, consider this other diagram in our registry, showing a methane combustion reaction: https://penrose.cs.cmu.edu/try/?examples=structural-formula/...

As you can see on that example, the methane molecule looks weird because all the bonds are drawn "below" the carbon atom, and the carbon dioxide molecule is all bent out of shape. In contrast, you can make the diagram both easier to specify https://github.com/samestep/diagrams/blob/3d7fe855b3a9634d17... (compared to the 70-line Penrose Substance file) and also more correct: https://raw.githubusercontent.com/samestep/diagrams/2c8fb334...

In general I think that a general-purpose text-based diagramming tool needs to support a variety of different layout engines.

• xhorizon

  1 2 6.8 Python

  xhorizon: A python package for the explicit computation and drawing of Penrose diagrams in general relativity.

  

• einsteinpy

  1 583 5.5 Python

  Repository for the EinsteinPy core package :rocket:

  

• mermaid

  122 66,838 10.0 JavaScript

  Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown

  

This feels like the LaTeX version of Mermaid.js [0]. I can do anything with it, but I gotta learn a lot of new syntax. So, really cool! Gonna have to dig into this.

[0] https://mermaid.js.org/

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• processing

  456 6,445 0.0 Java

  Source code for the Processing Core and Development Environment (PDE)

  

• excalidraw

  373 72,707 9.5 TypeScript

  Virtual whiteboard for sketching hand-drawn like diagrams

  

Sketch easy and go back to work...

https://excalidraw.com/

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