Catalogues are scene features; their analysis is an app (dark matter, large-scale structure, globular orbits)
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Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 15/100
- Issue type
- Documentation
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- javascript
- Domain
- design, documentation
Research direction
Start with DESIGN.md (the widgets drawer and dock section), design/URLs.md (the "Apps Token" section) and ROADMAP.md, then read js/scene/Colonization.md as the reference app. Done when the catalogue-versus-app rule is written into those three files and a dark-matter app exists, built on the rotation curves from PR #223 and the mass model from #106. The app part is substantial design work, so a newcomer should start with the documentation.
Written by the indexing model from the issue text.
Description
A cross-track decision, raised by the maintainer while reviewing PR #223 (SPARC galaxies): how deep catalogues and their analysis are presented, so controls and permalinks stay organised as the deep-sky catalogues grow (#117).
The rule
- Seeing a catalogue is a plain scene feature. Points, labels and search for galaxies, globulars and deep-sky objects are on as simply as possible:
- a key, as Celestia has (
efor galaxy labels,Efor globular labels); - a Settings checkbox;
- an
s=setting letter in the link.
- a key, as Celestia has (
- Analysing a catalogue is an app in the widgets drawer, as the Human Expansion app is (js/scene/Colonization.md; DESIGN.md, widgets drawer and dock). An app:
- may change the main scene and UI (add layers, swap a model, show plots);
- has its own controls for those changes in its panel;
- keeps its state in
apps.<id>:tokens (design/URLs.md, "Apps Token"), never in new view params ors=letters; - removes everything it added in its
stop, so the scene goes back to plain.
Candidates
-
Galaxy dynamics / dark matter (#106, with SPARC's rotation curves from #221/PR #223):
- the dark-matter halo on or off for the Milky Way and for each SPARC galaxy;
- the observed curve against the baryonic one;
- the radial acceleration relation.
PR #223 put a rotation-curve plot in the info panel; under this rule it moves into this app, and the info panel keeps only the catalogue's values.
-
Large-scale structure (the LSS issue, linked below): the observed web, the reconstructed volume, flows, and real or simulated.
-
Globular orbits (#228, with Baumgardt's Gaia velocities): orbits in the Milky Way's potential.
-
Human expansion (existing): already an app; the reference implementation.
What to write down
- A section in DESIGN.md (widgets drawer and dock): the rule above, and what an app may and may not change.
- A line in design/URLs.md: catalogue visibility is an
s=letter, analysis state isapps.<id>:. - A "Decisions that apply across tracks" entry in ROADMAP.md.
Done when
- The rule is documented in DESIGN.md, design/URLs.md and ROADMAP.md.
- The dark-matter app exists as the first analysis app, built on #223's rotation curves and #106's mass model.
Related: SPARC galaxies #221 / PR #223; globulars #228 (Harris, plus Baumgardt); deep-sky objects from OpenNGC #229; nearby galaxies #230; S4G and ATLAS3D #231; large-scale structure #232; catalogues as scene features, analysis as apps #233; galactic dynamics #106; the Milky Way #116.
Generated by Claude Code
- Dominant language
- JavaScript
- Stars
- 55
- Forks
- 4
- Avg merge
- 10h 12m
- Merged PRs (30d)
- 134
Getting set up
This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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