forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
89651b707c
`ui.view` and the MCP `screenshot` tool only turned to the named views, so
a picture sequence could only cut between them. `Orientation` (render) is a
camera orientation in degrees, {yaw, pitch, distance?}, checked as hostile
input: angles finite, distance finite and above 0, yaw wrapped, pitch
clamped to ±90, distance to 0.001–1e9. `modelcraft_engine::view::orientation`
parses it from JSON for both callers:
- control channel `ui.camera {yaw, pitch, distance?}` turns the app's camera;
- MCP `screenshot {camera}` turns it first (bridged through `ui.camera`,
headless in the CPU render, framed unless a distance is given). `view` and
`camera` are not given together.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
68 lines
8.5 KiB
Markdown
68 lines
8.5 KiB
Markdown
# Control protocol
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`fieldcraft --control PORT` (or `FIELDCRAFT_CONTROL_PORT=PORT`) listens on `127.0.0.1:PORT` for
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JSON lines. Each request is one line `{"id": …, "method": "…", "params": {…}}`; each reply is one
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line `{"id": …, "ok": true, "result": …}` or `{"id": …, "ok": false, "error": "…"}`. Requests are
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handled on the UI thread between frames; pointer and keyboard input is injected as real egui
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events, one pointer event per frame. The protocol has the same shape as SolidCraft's.
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```text
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fieldcraft --sample --control 7070 # or --sample cantilever | impact
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{"id":1,"method":"engine.execute","params":{"command":"model.info","params":{}}}
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→ {"id":1,"ok":true,"result":{"elements":{"hex8":64,"tet4":162},"nodes":199}}
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{"id":2,"method":"ui.render","params":{"path":"/tmp/model.png","width":900,"height":600}}
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```
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The channel is untrusted input. A request line may be at most 16 MiB; a longer one is answered
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with `{"ok": false, "error": "request too large"}` and the connection is closed, as are
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connections that send eight lines that are not JSON. At most 16 connections are served at once,
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at most 64 queued requests run per frame so a flood cannot starve drawing, and a request the UI
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thread has not answered within 60 seconds gets `{"ok": false, "error": "timeout"}`. Numbers are
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checked and clamped (drag steps, wheel lines, window size); `ui.render` refuses an image size out of range.
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## Engine
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| Method | Params | Result |
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|---|---|---|
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| `engine.execute` | `command`: command id, `params`: JSON object | the command's result |
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| `engine.script` | `commands`: `[{command, params}, …]` | stops at the first error; `journal`: commands that changed the model so far |
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| `engine.commands` | — | every command: `id`, `label`, `params` (the parameter documentation) |
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Commands never open forms or file pickers when run this way. `fieldcraft-cli commands` prints the
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same registry. `file.sample {name}` opens a sample (`parts`, `cantilever`, `impact`) and
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`solve.run {}` solves every step; the Results workspace comes up when a result appears.
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## UI
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| Method | Params | Notes |
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|---|---|---|
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| `ui.inspect` | — | view settings (`ui`), camera, viewport rect (points), renderer (`gpu`/`cpu`) and adapter, open command form, status bar, node and element counts, the results display (`results`: what the `results.*` commands reply: view, `stale`, contour range, modes), the probed node (`probe`), `busy` (the background job: a file opening, a solve), `prompt` (`{"unsaved": path}`, `"recover"`, `"samples"`), `recent` (recent files), `selected` (the browser's selected definition), `nav` (the left-drag mode), `layout` (each region of the window drawn last frame as `[x, y, w, h]` in points: `app_bar`, `ribbon`, `workspace_switcher`, `document_tab`, `app_bar:<action>`, `browser`, `viewport`, `nav_bar`, `axis_view`, `context`, `command_line`, `timeline`, `toolbar_dropdown`, `palette`), version |
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| `ui.set` | any view setting: `style` (`shaded_edges`, `shaded`, `wireframe`), `show_nodes`, `show_geometry`, `show_mesh`, `perspective`, `dark`, `show_tree` (the browser), `show_timeline`, `workspace` (`prepare`, `model`, `analysis`, `results`), `tab` (the toolbar tab: `geometry`, `mesh`, `properties`, `assembly`, `steps`, `loads`, `interactions`, `solve`, `results`, `tools`; a tab of another workspace brings that workspace), `palette` (the command search open), `menu` (the open menu: `file`, `help`, `workspace`, `view`, `more`, or a panel's drop-down as `<tab>/<panel>` such as `mesh/Tet`; `null` closes it) | an unknown setting or value is an error; returns the settings |
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| `ui.view` | `view`: `front`, `back`, `left`, `right`, `top`, `bottom`, `iso`, `home` (iso and fit), `fit` | returns the camera |
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| `ui.camera` | `yaw`, `pitch` (degrees), `distance?` (model units) | turns the camera to any orientation about its target: `yaw` about Z (0 looks along +Y, the front view; −45 is the iso view's, −90 the right view's), `pitch` the elevation above the XY plane; `distance` moves the eye (the zoom of an orthographic view). Angles must be finite and the distance above 0: the yaw is wrapped, the pitch clamped to ±90 and the distance to 0.001–10⁹; anything else is an error. A sequence of calls orbits smoothly. Returns the camera (`ui.inspect`'s, angles in radians) |
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| `ui.toolbar` | — | the ribbon: `workspace`, `workspaces`, `tab`, `tabs` (the workspace's), `menu` (the open menu), `panels` (each panel label's `menu` key and `rect`), and every catalogue entry (docs/features.md) with `id`, `label`, `tab`, `panel`, `command` (null while coming soon), `more` (its related commands), `coming_soon` (the milestone, or null), `fit` — `full` (a button), `collapsed` (its panel is one button), `more` (its panel is in the » menu) or `menu` (in its panel's drop-down) — and `rect` (screen points, last frame, on the shown tab; for `menu` entries the row while the drop-down is open) |
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| `ui.start` | `command`: a command or toolbar entry id | like a click on the toolbar, a drop-down row or a search result: a command without parameters runs, one with parameters opens its form in the context panel; an entry that is coming soon is an error naming its milestone. Never opens a native file picker: file entries (open, save as, write deck) open their command's form |
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| `ui.select` | `kind` (`set`, `material`, `section`, `step`, `boundary_condition`, `load`, `reference_point`, `coupling`, `fluid_domain`), `name`; nothing to deselect | selects a definition as a browser click does; its properties (with Edit and Delete) show in the context panel |
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| `ui.prompt` | `answer`: for `unsaved` `save`, `discard` or `cancel`; for `recover` `recover` (with `id` from `file.recovery.list`) or `close`; for `samples` `open` (with `name`) or `close` | answers the window's question (`ui.inspect`'s `prompt`) |
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| `ui.dialog` | `params?` (JSON object, fills the form), `run?`, `cancel?` | drives the open command form; `run` returns the command's result and closes the form on success |
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| `ui.click` | `x`, `y` (screen points), `button?`: `left`/`right`/`middle`, `shift?`, `ctrl?`, `alt?`, `double?` | real pointer input; a click on a results plot probes the nearest node of the face under it (`solve.probe`; `ui.inspect` shows the values) |
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| `ui.move` | `x`, `y` | |
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| `ui.drag` | `x0`, `y0`, `x1`, `y1`, `button?`, `shift?`, `ctrl?`, `steps?` (1–200) | press, move, release: in the viewport a left drag orbits, a right or middle drag (or Shift + left) pans |
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| `ui.scroll` | `x`, `y`, `delta?` (wheel lines, −100–100; positive zooms in) | zooms at the point |
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| `ui.key` | `key` (egui key name, `Enter`, `Escape`…), `cmd?`, `shift?` | `F` over the viewport frames the model |
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| `ui.text` | `text` | typed text (into the focused field) |
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| `ui.worldToScreen` | `points`: `[[x, y, z]…]` (at most 1000) | screen points in the viewport drawn last frame (null when not on screen) |
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| `ui.resize` | `width`, `height` | window inner size in points |
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| `ui.fullscreen` | `on?` (default true) | into or out of full screen; on macOS the title bar's left group moves into the traffic lights' room while there are none |
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| `ui.screenshot` | `path?` | PNG of the window, taken a few frames later; waits for a presented frame; when none comes within 8 seconds (a hidden window, a locked screen) it answers with `ui.capture`'s offscreen picture (`"offscreen": true`). Without `path`: `fieldcraft-shot.png` in the temporary folder |
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| `ui.capture` | `path?`, `width?`, `height?` (points; default the window's), `scale?` (pixels per point, 0.5–4; default the window's) | PNG of the whole window (title bar, ribbon, open menus and search, panels, forms and the viewport) drawn offscreen, without fade-in animations: the UI pass runs in a separate egui context and is rasterised on the CPU, so it works with the window hidden, minimised or the screen locked. At most 8192 pixels a side and 16 megapixels. Without `path`: `fieldcraft-shot.png` in the temporary folder |
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| `ui.render` | `path`, `width?` (default 1280), `height?` (default 800): whole pixels, each 1–8192 and at most 16 megapixels in all | CPU render of the model with the current camera and view settings (no window or GPU needed). A size out of range, or a scene over 20 million primitives, is an error |
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| `app.quit` | — | closes the window |
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## Files
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User clicks (title bar File menu, toolbar entries, Cmd/Ctrl+O, S, Shift+S), drops on the window and
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files named on the command line go through native file pickers and open in the background
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(`ui.inspect`'s `busy`); commands sent here take their paths as parameters and run at once
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(`file.open`, `file.save_as`, `geometry.open`, `geometry.import.mesh`, `deck.write`).
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