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Lineage, world files, trails, sweeps and a dark theme - #5
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Living birds only carry their parent's id, and the parent is usually long dead by the time anyone asks. `Lineage` keeps one record per bird ever born (parent, species, generation, birth and death ticks, cause of death, chick count) and answers the questions the inspector needs: the chain of ancestors, the chicks, and how many living birds descend from a bird. `relatives` picks the living birds that share a grandparent, which is what the map highlights. The log is compacted every 4096 ticks to the records still reachable from a living bird, so memory follows the population rather than the age of the world. It never touches the RNG and is not part of the checksum, so the golden value is unchanged. Snapshots now carry the log, which changes their layout; the crates move to 0.2.0 so older snapshots are rejected by the version check instead of misread.
`run --resume` and `verify --resume` start from a snapshot file instead of a seed, so a world saved in the browser can be continued headless, and `verify --resume world --ticks 0` prints the checksum the app showed when it was saved. `sweep` runs the cartesian product of `--set field=v1,v2,...` across seeds in parallel and writes one CSV row per run: final and second-half mean populations, minima, immigration counts, extinction ticks, mean field of view and checksum. Fields are set on the config JSON by dotted path, so a misspelt name is an error rather than a silently unchanged run.
`Sim` now remembers which bird is selected. While one is selected it records that bird's position every tick into a trail and flags its relatives in every packed frame, so the page only has to say when the selection changes. New methods: `select`, `selected`, `family`, `refreshRelatives` and `introduce` (release a bird from a saved genome file). The frame grows a fifth header float (trail length) and two floats per bird (speed as a fraction of top speed, and the kin flag), and carries the trail after the patches. The worker follows the facade: it forwards selection, sends the family and relative count about once a second alongside the frame, restores worlds from bytes, exports them, and releases genomes. The protocol, client, type mirrors and the Node test of the wasm are updated with it.
The inspector gains a Family block: ancestors back to a founder (older generations collapsed into a count) with how long each lived, how many chicks it had and how it died; living chicks as clickable chips; living descendants; and how many relatives the map is highlighting. Living ancestors and chicks select on click. The renderer draws a soft halo under every relative of the selected bird and the selected bird's trail as fading dots, one per tick, with a toggle and the T key. A bird that is not moving now holds its wings level instead of flapping on the spot. The wedge outline is wrapped relative to the bird, so an outline crossing the torus edge no longer draws a line across the map.
"Save world" downloads the running world as a .world file, the same bytes `rustywings run --resume` reads. "Open", or dropping the file on the map, restores it; a bad file leaves the running world alone and says why. Dropping a saved genome .json, or "Release a saved genome" in the empty inspector, adds that bird to the world and selects it.
System, light and dark, chosen in the settings and remembered. The effective theme lands on <html data-theme> before first paint; the CSS switches its variables, and the canvas field, the selection and trail ink and the chart colours are read back from those variables so nothing is defined twice. The dark series colours are steps of the same three hues, chosen to keep colour-vision separation and 3:1 contrast on the dark surface.
Two pointers on the map zoom about their midpoint while the midpoint pans; one still drags and taps. Trackpad pinches, which arrive as ctrl+wheel with small deltas, get a larger zoom factor.
Type-aware ESLint (typescript-eslint's recommendedTypeChecked plus consistent type imports, exhaustive switches, eqeqeq and no stray console output) and Prettier at 140 columns. Both run in CI after the wasm build so the generated declarations are available. The stylesheet and index.html are excluded from Prettier: one rule per line reads better than its expansion. The findings were small: a few unnecessary casts, a promise handed to an event handler, and a redundant union member.
A screenshot of the app, a recording of following a bird (trail, field of view, relatives' halos) and the family panel, captured from the built site. The README describes the browser features, the world and genome files, `--resume` and `sweep`; the web README lists the new modules and the file formats.
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`libs/` and `www/` were the tutorial-derived crates and webpack site the project started from. Everything deployed now lives in `crates/` and `web/`, so the workspace is just `crates/*`, and CI formats, lints and tests the whole workspace instead of naming the crates one by one. The Vercel project must point its Root Directory at the repository root before this merges: the old site's directory no longer exists.
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Remove the legacy app
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Stacked on #4. The world gets a memory of who begat whom, files that move worlds and birds between the browser and the CLI, a
sweepsubcommand for tuning, and the frontend gets the family view, trails, a dark theme, pinch zoom and lint tooling. The golden checksum is unchanged: nothing in the simulation's arithmetic moved.Core
Lineage: one record per bird ever born (parent, generation, birth and death ticks, cause, chicks), compacted every 4096 ticks to the records reachable from living birds. Answers ancestors, chicks, living descendants and "relatives" (birds sharing a grandparent). It never touches the RNG and is not hashed. Snapshots carry it, so the crates are 0.2.0 and older snapshots are rejected by the version check instead of misread.CLI
run --resume/verify --resumestart from a snapshot file;verify --resume world --ticks 0prints the checksum the app showed when the file was saved.sweep --set field=v1,v2 --set other=a,b --seeds N --ticks T --out sweep.csv: cartesian product across seeds in parallel, one CSV row per run (final and second-half means, minima, immigration, extinction ticks, field of view, checksum). Fields are set by dotted path on the config JSON, so a misspelt one is an error.wasm facade
Simowns the selection: it records the selected bird's trail every tick and flags its relatives in every frame. New:select,selected,family,refreshRelatives,introduce(release a bird from a saved genome). Frame layout: header 5, 10 floats per bird (speed fraction, kin flag), trail after the patches;protocol.tsmirrors it.Browser
T), and resting birds hold their wings level. The selected bird's wedge outline no longer spans the map when it crosses the torus edge..worldfiles; drop a saved genome to release that bird.index.htmlare hand-laid-out and excluded from Prettier.Docs
.github/media/; the web README lists the new modules and file formats.Performance, looked at and left alone. A native profile puts about three quarters of a tick in the two sensing queries. A cell-ordered, batch-filtered grid was tried: bit-identical, but no faster (8.4 vs 8.3 ms/tick at ~4k birds), so it was dropped. The remaining levers (sensing cadence, SIMD, cheaper angle wrapping) all change bits or need nightly.
Checks
cargo test --workspace, fmt, clippy (native and wasm32), golden checksum1065c218b08af910.pnpm build,lint,format:check,test(27 tests, wasm loaded in Node).vite previewin headless Brave (SwiftShader), light and dark.Action needed at merge time. As with #4, the Vercel project's Root Directory must be changed from
wwwto the repository root, or the Vercel check keeps failing.