Facility Monitoring
Review camera evidence and equipment measurements at the fictional West utility plant. Follow a supplied source time or inspect a past event with the camera, equipment details, site map and pressure history synchronized to one cursor. The industrial example uses a generated silent still-scene recording, with source time fixed at 14:31 UTC.
Interactive product exampleOpen workspace ↗
Loading training footage…
Simulation controls
Training fixture · fixed source time 14:31 UTC. Generated silent still-scene footage; equipment reports and camera responses are simulated.
Review an event
Select Pressure above supplied limit in Event history to inspect the report and camera at that moment. Play, pause, scrub, change speed, or step between events. Each seek pauses playback. The chart's solid review marker tracks the requested time independently of its sample inspection. Measurements retain their supplied units; this fixture uses bar.
The equipment Inspector and map use the latest report at or before the cursor. Before the first report, condition, data quality and position remain unavailable. Tracks contain only observations available at that moment. The full pressure history remains visible for context; no reading is interpolated at the review marker.
Review window bounds playback. Return to live follows the application's latest supplied reference. It does not use the browser clock as proof of a fresh report. Playing from the end restarts at the review window start. The training host owns a playback timer, while the reusable PlaybackControls owns no clock.
Camera evidence
The requested review time and the decoded frame time are separate facts. MediaFrame shows the frame's capture time and explicit waiting, retained, unavailable or delayed state. The native-video adapter confirms metadata and seek completion before enabling Capture snapshot. A paused seek that remains unresolved for five seconds reloads the decoder once; capture stays unavailable until the requested frame is confirmed. If recovery also takes five seconds, an error directs the operator to Reload media. Failed decoding and rejected playback remain visible; Reload media retries the selected source.
The pump camera has a recording gap from 14:30:25 through 14:30:35 UTC. Selecting that event leaves equipment and history available and shows No recording at the selected time. The unavailable yard camera demonstrates permission and connection states. Equipment without a camera or position remains accessible through the equipment list.
Camera wall shows decoded previews at the shared review time. Open a camera to inspect its details. Bookmark this time saves a time, camera and equipment for this source during the session; restoring it also restores the complete review window. Snapshots are local PNG captures with their confirmed time and source. They can be downloaded or removed and are lost on reload.
Camera requests
Reset camera view requires a connected camera, supplied permission, a live view and an application adapter. Historical views are read-only. The Reject camera requests option under Simulation controls exercises a simulated refusal. An accepted request means the service accepted it; the UI does not infer completion. Transport failures explain that the outcome could not be confirmed.
State ownership
const [review, setReview] = useState(() => initialReview(snapshot));
<FacilityMonitoring
snapshot={snapshot}
review={review}
onReviewChange={setReview}
onCameraCommand={requestCameraView}
/>;The application supplies camera permissions, connection state, latency, recording intervals, equipment history, events, geometry and the live reference. Recording intervals use absolute milliseconds with an inclusive start and exclusive end; mediaOffset is seconds in the media file. Equipment pressure values use bar in this reference model. Adapt the model and chart together when using another measurement.
The recipe owns local camera/equipment selection, map view, session bookmarks and captures. The demo host advances playback using elapsed time and stops at the review boundary. Consumers own service authorization, transport, retention, timestamp alignment and the lifecycle of source updates. Camera request results from a replaced source or camera are ignored locally; the application still owns any service-side operation.
The media fixture is embedded in the copyable source so the installed demo works without a separate asset server. It is a 65-second, 960×540, 8 fps, silent H.264 still-scene video (344,268 bytes before base64 encoding). Replace it with application recordings for production. The standalone MediaFrame docs use the same asset at /training/facility-pump.mp4.
The map reuses the shared geographic adapter and local vectors. Copying the recipe requires ol@10.10.0, the standard OPERATOR styles and a Tailwind content scan of the installed core package. There are no external camera, map-tile or location requests in this example.
import { FacilityMonitoringDemo } from "./patterns/facility-monitoring";
<FacilityMonitoringDemo />View recipe source (18 files)
Copy all files into your app, preserving their relative paths.
Package imports: @operator-ds/react, ol, react.
patterns/facility-monitoring/index.ts
export { FacilityMonitoring } from "./facility-monitoring";
export { FacilityMonitoringDemo } from "./demo";
export {
initialReview,
transitionReview,
resolveEquipment,
resolveRecording,
reviewAt,
} from "./review-state";
export { createFacilitySnapshot } from "./fixtures";
export type {
FacilitySnapshot,
FacilityReviewState,
FacilityMonitoringProps,
FacilityCamera,
FacilityEquipment,
FacilityRecording,
FacilityBookmark,
CameraCommandRequest,
CameraCommandResult,
} from "./types";
patterns/facility-monitoring/facility-monitoring.tsx
"use client";
import { memo, useCallback, useEffect, useMemo, useReducer, useRef, useState } from "react";
import {
ActionStatus,
AttachmentPreview,
Badge,
Button,
Chart,
EntityPreview,
EventTimeline,
Inspector,
MediaFrame,
PlaybackControls,
TimeRange,
type ActionState,
type MediaFrameProps,
} from "@operator-ds/react";
import { GeoMap } from "../geospatial-workspace/geo-map";
import type { GeoSnapshot } from "../geospatial-workspace/types";
import { formatUtcEpoch } from "../operational-domain";
import { initialFacilityLayers, initialFacilityView } from "./fixtures";
import { resolveEquipment, resolveRecording, reviewAt, transitionReview } from "./review-state";
import {
SynchronizedVideo,
type VideoCaptureHandle,
type VideoFrameState,
} from "./synchronized-video";
import type {
FacilityBookmark,
FacilityCamera,
FacilityMonitoringProps,
FacilitySnapshot,
} from "./types";
/**
* A time as "YYYY-MM-DD HH:MM:SS UTC", always in whole seconds: playback moves the cursor between
* seconds, and nothing here needs sub-second timing. `zone: false` drops the trailing "UTC" for the
* chart, which appends its own unit.
*/
const utc = (time: number, zone = true) => {
const text = formatUtcEpoch(time, { milliseconds: "never" });
return zone ? text : text.replace(/ UTC$/, "");
};
const chartTime = (time: number) => utc(time, false);
/** Shared by every render, so a memoized child sees the same value each time. */
const noAnnotations: readonly never[] = [];
const noop = () => {};
const StableChart = memo(Chart);
const StableEventTimeline = memo(EventTimeline);
type FrameRecord = { key: string; src: string | undefined; value: VideoFrameState };
/**
* Whether a new frame report changes nothing the console shows. The video reports every few
* hundred milliseconds while it plays; the console shows the state, the message, the whole second
* it captured, and whether the frame is close enough to the cursor to count as synchronized.
*/
function sameFrame(previous: FrameRecord, next: FrameRecord, wanted: number | null): boolean {
if (previous.key !== next.key || previous.src !== next.src) return false;
const a = previous.value;
const b = next.value;
if (a.state !== b.state || a.message !== b.message) return false;
if (a.mediaTime === b.mediaTime) return true;
if (a.mediaTime === null || b.mediaTime === null) return false;
const close = (mediaTime: number) => wanted !== null && Math.abs(mediaTime - wanted) <= 0.25;
return (
Math.floor(a.mediaTime) === Math.floor(b.mediaTime) && close(a.mediaTime) === close(b.mediaTime)
);
}
const focusStyle =
"outline-none focus-visible:shadow-oprt-focus forced-colors:focus-visible:outline forced-colors:focus-visible:outline-2";
const titleStyle = "m-0 text-oprt-base font-semibold uppercase tracking-oprt-caps";
/** One application-owned cursor drives camera, equipment, map and trend evidence. */
export function FacilityMonitoring({
snapshot,
review,
onReviewChange,
onCameraCommand,
}: FacilityMonitoringProps) {
const [cameraId, setCameraId] = useState<string | null>(snapshot.cameras[0]?.id ?? null);
const [equipmentId, setEquipmentId] = useState<string | null>(
snapshot.cameras[0]?.equipmentId ?? snapshot.equipment[0]?.id ?? null,
);
const [wall, setWall] = useState(false);
const [showRange, setShowRange] = useState(false);
const [bookmarks, setBookmarks] = useState<FacilityBookmark[]>([]);
const [eventId, setEventId] = useState<string | null>(null);
const [view, setView] = useState(initialFacilityView);
const frameReport = useRef<FrameRecord | null>(null);
const [, redrawForFrame] = useReducer((count: number) => count + 1, 0);
const [retry, setRetry] = useState(0);
const [capture, setCapture] = useState<{ src: string; at: number; camera: string } | null>(null);
const [captureStatus, setCaptureStatus] = useState<{
state: ActionState;
message: string;
} | null>(null);
const [command, setCommand] = useState<{
state: ActionState;
message: string;
requestId?: string;
} | null>(null);
const inspector = useRef<HTMLElement>(null);
const media = useRef<VideoCaptureHandle>(null);
const requestVersion = useRef(0);
const captureVersion = useRef(0);
const bookmarkCount = useRef(0);
const bookmarkList = useRef<HTMLDivElement>(null);
const bookmarkButton = useRef<HTMLButtonElement>(null);
const focusAfterBookmarks = useRef<string | null>(null);
const [bookmarkNote, setBookmarkNote] = useState("");
const sourceKey = JSON.stringify([snapshot.id, snapshot.source]);
const visibleBookmarks = bookmarks.filter((bookmark) => bookmark.sourceKey === sourceKey);
const selectedCamera = snapshot.cameras.find((camera) => camera.id === cameraId);
const time = reviewAt(snapshot, review);
const resolved = useMemo(() => resolveEquipment(snapshot, time), [snapshot, time]);
// The map only needs a new snapshot when the evidence changes, not on every tick of the cursor.
const held = useRef<{ snapshot: FacilitySnapshot; value: GeoSnapshot } | null>(null);
if (
!held.current ||
held.current.snapshot !== snapshot ||
held.current.value.revision !== resolved.revision
)
held.current = { snapshot, value: resolved };
const mapSnapshot = held.current.value;
const selectedEquipment = mapSnapshot.entities.find((entity) => entity.record.id === equipmentId);
const cameraTime =
review.mode === "live" &&
selectedCamera &&
Number.isFinite(selectedCamera.latencyMs) &&
selectedCamera.latencyMs! >= 0
? time - selectedCamera.latencyMs!
: time;
const clip =
selectedCamera && (review.mode === "review" || selectedCamera.connection === "connected")
? resolveRecording(selectedCamera, cameraTime)
: null;
const frameKey = JSON.stringify([
sourceKey,
selectedCamera?.id,
clip?.recording.id,
clip?.recording.start,
clip?.recording.end,
clip?.recording.mediaOffset,
retry,
]);
// The latest report is read here, so a render between two redraws still sees the newest frame.
const frame = frameReport.current;
const actualFrame =
frame?.key === frameKey && frame.src === clip?.recording.src ? frame.value : null;
const wantedMediaTime = useRef<number | null>(null);
wantedMediaTime.current = clip?.mediaTime ?? null;
const synchronized =
!!clip &&
!!actualFrame &&
actualFrame.state === "ready" &&
actualFrame.mediaTime !== null &&
Math.abs(actualFrame.mediaTime - clip.mediaTime) <= 0.25;
const capturedAt =
clip && actualFrame?.mediaTime != null
? clip.recording.start + (actualFrame.mediaTime - clip.recording.mediaOffset) * 1000
: null;
const clipSrc = clip?.recording.src;
const onFrameChange = useCallback(
(value: VideoFrameState) => {
const previous = frameReport.current;
const next = { key: frameKey, src: clipSrc, value };
frameReport.current = next;
if (!previous || !sameFrame(previous, next, wantedMediaTime.current)) redrawForFrame();
},
[frameKey, clipSrc],
);
const currentKey = useRef(frameKey);
currentKey.current = frameKey;
// Keyed to whether a camera service exists, not to the function: a host that passes a new
// function on every render would otherwise clear each confirmation within a quarter second.
const hasCameraService = Boolean(onCameraCommand);
useEffect(() => {
requestVersion.current++;
captureVersion.current++;
setCommand(null);
setCaptureStatus(null);
}, [sourceKey, cameraId, hasCameraService]);
useEffect(
() => () => {
requestVersion.current++;
captureVersion.current++;
},
[],
);
// Handlers that go to memoized children keep one identity and read the latest props from here.
const latest = useRef({ snapshot, review, onReviewChange });
latest.current = { snapshot, review, onReviewChange };
const selectCamera = useCallback((camera: FacilityCamera) => {
setCameraId(camera.id);
setEquipmentId(camera.equipmentId);
}, []);
const cameras = snapshot.cameras;
const selectEquipment = useCallback(
(id: string | null) => {
setEquipmentId(id);
const related = cameras.find((camera) => camera.equipmentId === id);
setCameraId(related?.id ?? null);
},
[cameras],
);
const seek = useCallback((at: number) => {
const current = latest.current;
current.onReviewChange(
transitionReview(current.review, { type: "seek", time: at }, current.snapshot),
);
}, []);
const openFromWall = useCallback(
(camera: FacilityCamera) => {
selectCamera(camera);
setWall(false);
},
[selectCamera],
);
const inspectOnMap = useCallback(
(id: string | null) => {
selectEquipment(id);
inspector.current?.focus();
},
[selectEquipment],
);
const selectFromTimeline = useCallback(
(id: string | null) => {
const { snapshot: current } = latest.current;
const event = current.events.find((item) => item.id === id);
if (!event) return;
setEventId(event.id);
if (event.cameraId) {
const camera = current.cameras.find((item) => item.id === event.cameraId);
if (camera) selectCamera(camera);
} else if (event.equipmentId) selectEquipment(event.equipmentId);
seek(event.start);
},
[selectCamera, selectEquipment, seek],
);
function addBookmark() {
bookmarkCount.current++;
const name = utc(time);
setBookmarks((current) => [
...current,
{
id: `${snapshot.id}:${bookmarkCount.current}`,
name,
cursor: time,
cameraId,
equipmentId,
sourceKey,
},
]);
setBookmarkNote(`Bookmark ${name} added.`);
}
function removeBookmark(bookmark: FacilityBookmark) {
const index = visibleBookmarks.findIndex((item) => item.id === bookmark.id);
const neighbor = visibleBookmarks[index + 1] ?? visibleBookmarks[index - 1];
// Focus moves to the neighboring bookmark, or back to the control that adds one.
focusAfterBookmarks.current = neighbor?.id ?? "add";
setBookmarks((current) => current.filter((item) => item.id !== bookmark.id));
setBookmarkNote(`Bookmark ${bookmark.name} removed.`);
}
useEffect(() => {
const target = focusAfterBookmarks.current;
if (target === null) return;
focusAfterBookmarks.current = null;
const restore = [
...(bookmarkList.current?.querySelectorAll<HTMLElement>("[data-restore-bookmark]") ?? []),
].find((element) => element.dataset.restoreBookmark === target);
(target === "add" ? bookmarkButton.current : restore)?.focus();
}, [bookmarks]);
async function takeSnapshot() {
if (!synchronized || !media.current || !selectedCamera || !clip) return;
const version = ++captureVersion.current;
const key = frameKey;
const cameraName = selectedCamera.name;
setCaptureStatus({ state: "in-progress", message: "Capturing the confirmed frame…" });
try {
const result = await media.current.capture();
if (version !== captureVersion.current || key !== currentKey.current) return;
if (Math.abs(result.mediaTime - clip.mediaTime) > 0.25)
throw new Error("The displayed frame moved. Pause review and try again.");
const at = clip.recording.start + (result.mediaTime - clip.recording.mediaOffset) * 1000;
setCapture({ src: result.src, at, camera: cameraName });
setCaptureStatus({
state: "complete",
message: `Snapshot captured at ${utc(at)}. Stored in this session.`,
});
} catch (error) {
if (version === captureVersion.current && key === currentKey.current)
setCaptureStatus({
state: "failed",
message:
error instanceof Error
? error.message
: "Snapshot unavailable. Try again when the frame is ready.",
});
}
}
const commandReason = !selectedCamera
? "Select a camera to see its controls."
: review.mode !== "live"
? "Camera controls are read-only during historical review."
: !selectedCamera.canControl
? (selectedCamera.controlReason ?? "Camera access is read-only.")
: selectedCamera.connection !== "connected"
? "Camera controls are unavailable while disconnected."
: !onCameraCommand
? "No camera-control integration supplied."
: null;
async function resetCamera() {
if (commandReason || !selectedCamera || !onCameraCommand || command?.state === "in-progress")
return;
const version = ++requestVersion.current;
setCommand({ state: "in-progress", message: "Requesting the configured camera view…" });
try {
const result = await onCameraCommand({
cameraId: selectedCamera.id,
command: "reset-view",
requestedAt: time,
});
if (version === requestVersion.current) setCommand(result);
} catch {
if (version === requestVersion.current)
setCommand({
state: "failed",
message: "Camera request failed. No outcome was confirmed.",
});
}
}
const mediaState: MediaFrameProps["state"] = !clip
? selectedCamera?.connection === "reconnecting"
? "reconnecting"
: "unavailable"
: actualFrame?.state === "error"
? "unavailable"
: !synchronized
? "reconnecting"
: review.mode === "live"
? selectedCamera?.latencyMs === null ||
!Number.isFinite(selectedCamera?.latencyMs) ||
selectedCamera!.latencyMs! < 0
? "recorded"
: selectedCamera && (selectedCamera.latencyMs ?? 0) > 0
? "delayed"
: "live"
: review.playing
? "recorded"
: "paused";
const detail = !selectedCamera
? "No camera is associated with this equipment."
: review.mode === "live" && selectedCamera.connection !== "connected"
? "Camera access is unavailable. Equipment and history remain accessible."
: !clip
? "No recording at the selected time."
: actualFrame?.state === "error"
? (actualFrame.message ?? "Media could not be decoded.")
: !synchronized
? "Waiting for the requested frame. Displayed imagery may be from the previous position."
: review.mode === "live" &&
(selectedCamera.latencyMs === null ||
!Number.isFinite(selectedCamera.latencyMs) ||
selectedCamera.latencyMs < 0)
? "Live alignment unknown. Showing the recording at the requested source time."
: "Generated silent still-scene recording for this training example.";
const pressure = snapshot.equipment.find((equipment) => equipment.id === equipmentId);
const series = useMemo(
() => [
{
id: equipmentId ?? "pressure",
label: pressure?.name ?? "No equipment",
data: pressure?.history.map((report) => ({ x: report.at, y: report.pressure })) ?? [],
},
],
[equipmentId, pressure],
);
const selectedEvent =
snapshot.events.find((event) => event.id === eventId && event.start === time) ??
snapshot.events.find((event) => event.start === time);
return (
<section
aria-label="Facility monitoring"
className="not-prose flex min-w-0 flex-col gap-3u font-sans text-oprt-base text-oprt-text"
>
<header className="flex flex-wrap items-start justify-between gap-2u border-b border-oprt-border pb-2u">
<div className="flex min-w-0 flex-col gap-1u">
<h2 className="m-0 text-oprt-xl font-semibold">
{snapshot.title ?? "West utility plant"}
</h2>
<p className="m-0 text-oprt-text-dim">{snapshot.source}</p>
</div>
<div className="flex flex-col items-end gap-1u">
<Badge
appearance="text"
indicator="none"
variant={review.mode === "live" ? "success" : "info"}
>
{review.mode === "live" ? "Following source" : "Historical review"}
</Badge>
<span className="font-mono">{utc(time)}</span>
</div>
</header>
<div
role="group"
aria-label="Camera selection"
className="flex flex-wrap items-center gap-1u"
>
{snapshot.cameras.map((camera) => (
<Button
key={camera.id}
size="sm"
variant={camera.id === cameraId ? "secondary" : "ghost"}
aria-label={`Select ${camera.name}`}
aria-pressed={camera.id === cameraId}
onClick={() => selectCamera(camera)}
>
{camera.name}
</Button>
))}
<Button size="sm" variant="tertiary" aria-pressed={wall} onClick={() => setWall(!wall)}>
Camera wall
</Button>
</div>
{wall && (
<div
aria-label="Camera wall"
className="grid min-w-0 grid-cols-[repeat(auto-fit,minmax(min(100%,24rem),1fr))] gap-2u"
>
{snapshot.cameras.map((camera) => (
<CameraWallTile
key={`${sourceKey}:${camera.id}`}
camera={camera}
time={time}
historical={review.mode === "review"}
playing={review.mode === "review" && review.playing}
rate={review.playbackRate}
onOpen={openFromWall}
/>
))}
</div>
)}
<div className="flex min-w-0 flex-wrap items-start gap-3u">
<div className="flex min-w-0 flex-[2_1_32rem] flex-col gap-2u">
<MediaFrame
label={selectedCamera?.name ?? "Camera view"}
state={mediaState}
capturedAt={capturedAt}
{...(review.mode === "live" && selectedCamera
? { latencyMs: selectedCamera.latencyMs }
: {})}
{...(selectedCamera ? { source: selectedCamera.source } : {})}
retained={!!clip && !!actualFrame && !synchronized && actualFrame.mediaTime !== null}
detail={detail}
actions={
<>
<Button
size="sm"
variant="secondary"
disabled={!synchronized || captureStatus?.state === "in-progress"}
onClick={takeSnapshot}
>
Capture snapshot
</Button>
<Button
size="sm"
variant="tertiary"
disabled={!selectedCamera || !clip}
onClick={() => setRetry((value) => value + 1)}
>
Reload media
</Button>
</>
}
>
{clip && (
<SynchronizedVideo
key={frameKey}
ref={media}
src={clip.recording.src}
time={clip.mediaTime}
playing={review.mode === "review" && review.playing}
playbackRate={review.playbackRate}
label={`${selectedCamera!.name} footage`}
onFrameChange={onFrameChange}
/>
)}
</MediaFrame>
<div className="flex flex-wrap items-center gap-2u">
<Button
size="sm"
variant="tertiary"
disabled={!!commandReason || command?.state === "in-progress"}
onClick={resetCamera}
>
Reset camera view
</Button>
{commandReason && <p className="m-0 text-oprt-text-dim">{commandReason}</p>}
</div>
{command && <ActionStatus label="Camera request" {...command} />}
{captureStatus && <ActionStatus label="Snapshot" {...captureStatus} />}
</div>
<div className="flex min-w-0 flex-[1_1_21rem] flex-col gap-2u">
<div role="group" aria-label="Equipment list" className="flex flex-wrap gap-1u">
{snapshot.equipment.map((equipment) => (
<Button
key={equipment.id}
size="sm"
variant={equipment.id === equipmentId ? "secondary" : "tertiary"}
aria-pressed={equipment.id === equipmentId}
onClick={() => selectEquipment(equipment.id)}
>
{equipment.name}
</Button>
))}
</div>
<Inspector
ref={inspector}
title="Equipment at review time"
tabIndex={-1}
className={focusStyle}
>
{selectedEquipment ? (
<EntityPreview
entity={{
...selectedEquipment.record,
facts: [
{ id: "review-time", label: "Review time", value: utc(time), mono: true },
...selectedEquipment.record.facts,
],
}}
/>
) : (
<p className="m-0 text-oprt-text-dim">
Select equipment to inspect the available evidence.
</p>
)}
</Inspector>
</div>
</div>
<div className="border-y border-oprt-border py-2u">
<PlaybackControls
label="Review time"
start={review.range.start}
end={review.range.end}
value={time}
playing={review.playing}
onValueChange={seek}
onPlayingChange={(playing) => {
const ready =
playing && time >= review.range.end
? transitionReview(review, { type: "seek", time: review.range.start }, snapshot)
: review;
onReviewChange(transitionReview(ready, { type: "play", playing }, snapshot));
}}
playbackRate={review.playbackRate}
onPlaybackRateChange={(rate) =>
onReviewChange(transitionReview(review, { type: "rate", rate }, snapshot))
}
eventTimes={snapshot.events.map((event) => event.start)}
liveTime={snapshot.liveTime}
followingLive={review.mode === "live"}
onReturnToLive={() =>
onReviewChange(transitionReview(review, { type: "live" }, snapshot))
}
/>
<div className="mt-2u flex flex-wrap gap-1u">
<Button
size="sm"
variant="tertiary"
aria-expanded={showRange}
onClick={() => setShowRange(!showRange)}
>
Review window
</Button>
<Button ref={bookmarkButton} size="sm" variant="tertiary" onClick={addBookmark}>
Bookmark this time
</Button>
</div>
<p
role="status"
aria-label="Bookmarks"
className={`m-0 text-oprt-text-dim ${bookmarkNote ? "mt-2u" : ""}`}
>
{bookmarkNote}
</p>
{showRange && (
<div className="mt-2u">
<TimeRange
label="Review window"
value={review.range}
min={snapshot.range.start}
max={snapshot.range.end}
onValueChange={(range) =>
onReviewChange(transitionReview(review, { type: "range", range }, snapshot))
}
/>
</div>
)}
</div>
{visibleBookmarks.length > 0 && (
<div
ref={bookmarkList}
className="flex flex-col gap-1u"
aria-label="Saved review bookmarks"
>
<h3 className={titleStyle}>Session bookmarks</h3>
{visibleBookmarks.map((bookmark) => (
<div key={bookmark.id} className="flex flex-wrap items-center gap-1u">
<Button
size="sm"
variant="tertiary"
aria-label={`Restore bookmark ${bookmark.name}`}
data-restore-bookmark={bookmark.id}
onClick={() => {
const camera = snapshot.cameras.find((item) => item.id === bookmark.cameraId);
if (camera) selectCamera(camera);
else {
setCameraId(null);
setEquipmentId(bookmark.equipmentId);
}
onReviewChange(
transitionReview(
{ ...review, range: snapshot.range },
{ type: "seek", time: bookmark.cursor },
snapshot,
),
);
}}
>
{bookmark.name} ·{" "}
{snapshot.cameras.find((item) => item.id === bookmark.cameraId)?.name ??
"Equipment review"}
</Button>
<Button
size="sm"
variant="ghost"
aria-label={`Remove bookmark ${bookmark.name}`}
onClick={() => removeBookmark(bookmark)}
>
Remove
</Button>
</div>
))}
</div>
)}
<div className="grid min-w-0 grid-cols-[repeat(auto-fit,minmax(min(100%,28rem),1fr))] gap-3u">
<div className="flex min-w-0 flex-col gap-2u">
<GeoMap
snapshot={mapSnapshot}
entities={mapSnapshot.entities}
selectedId={equipmentId}
onSelectedIdChange={selectEquipment}
view={view}
onViewChange={setView}
layers={initialFacilityLayers}
annotations={noAnnotations}
measurement={noAnnotations}
mode="inspect"
onPoint={noop}
onFrame={noop}
onInspect={inspectOnMap}
/>
<p className="m-0 text-oprt-text-dim">
Locations use reports available at the review time. Equipment without a position remains
in the list.
</p>
</div>
<StableChart
label="Equipment pressure history"
series={series}
xDomain={snapshot.range}
range={review.range}
cursor={time}
cursorLabel="Review time"
unit="bar"
xLabel="Time"
xUnit="UTC"
formatX={chartTime}
description="Supplied samples. Gaps stay missing; the solid review marker does not interpolate a pressure reading."
/>
</div>
<section aria-label="Facility event history" className="flex min-w-0 flex-col gap-2u">
<h3 className={titleStyle}>Event history</h3>
<StableEventTimeline
label="Facility events"
events={snapshot.events}
start={review.range.start}
end={review.range.end}
selectedId={selectedEvent?.id ?? null}
onSelectionChange={selectFromTimeline}
/>
</section>
{capture && (
<AttachmentPreview
label="Captured camera frame"
attachment={{
id: "local-frame",
name: `${capture.camera} · ${utc(capture.at)}`,
sizeBytes: Math.floor(((capture.src.split(",")[1]?.length ?? 0) * 3) / 4),
mediaType: "image/png",
}}
preview={{
kind: "image",
src: capture.src,
alt: `Generated training image from ${capture.camera}, captured ${utc(capture.at)}`,
}}
onDownload={() => {
const anchor = document.createElement("a");
anchor.href = capture.src;
anchor.download = "facility-training-snapshot.png";
anchor.click();
}}
onRemove={() => setCapture(null)}
/>
)}
</section>
);
}
const CameraWallTile = memo(function CameraWallTile({
camera,
time,
historical,
playing,
rate,
onOpen,
}: {
camera: FacilityCamera;
time: number;
historical: boolean;
playing: boolean;
rate: number;
onOpen: (camera: FacilityCamera) => void;
}) {
const [frame, setFrame] = useState<{ src: string; value: VideoFrameState } | null>(null);
const latency =
camera.latencyMs !== null && Number.isFinite(camera.latencyMs) && camera.latencyMs >= 0
? camera.latencyMs
: null;
const clip =
historical || camera.connection === "connected"
? resolveRecording(camera, time - (historical ? 0 : (latency ?? 0)))
: null;
const src = clip?.recording.src ?? "";
const onFrameChange = useCallback((value: VideoFrameState) => setFrame({ src, value }), [src]);
const actual = frame?.src === src ? frame.value : null;
const ready =
!!clip &&
actual?.state === "ready" &&
actual.mediaTime !== null &&
Math.abs(actual.mediaTime - clip.mediaTime) <= 0.25;
const capturedAt =
clip && actual?.mediaTime != null
? clip.recording.start + (actual.mediaTime - clip.recording.mediaOffset) * 1000
: null;
const state =
!clip || actual?.state === "error"
? "unavailable"
: !ready
? "reconnecting"
: historical
? playing
? "recorded"
: "paused"
: latency === null
? "recorded"
: latency > 0
? "delayed"
: "live";
return (
<MediaFrame
label={`${camera.name} overview`}
state={state}
capturedAt={capturedAt}
source={camera.source}
retained={!!clip && capturedAt !== null && !ready}
detail={
!clip
? "No camera image available."
: actual?.state === "error"
? (actual.message ?? "Media could not be decoded.")
: !ready
? "Waiting for the requested frame."
: !historical && latency === null
? "Live alignment unknown."
: "Frame aligned to the shared review time."
}
actions={
<Button size="sm" variant="tertiary" onClick={() => onOpen(camera)}>
Open {camera.name}
</Button>
}
>
{clip && (
<SynchronizedVideo
key={clip.recording.id}
src={src}
time={clip.mediaTime}
playing={playing}
playbackRate={rate}
label={`${camera.name} overview footage`}
onFrameChange={onFrameChange}
/>
)}
</MediaFrame>
);
});
patterns/geospatial-workspace/geo-map.tsx
"use client";
import {
memo,
useCallback,
useEffect,
useId,
useLayoutEffect,
useMemo,
useRef,
useState,
type RefObject,
} from "react";
import { Button, EntityPreview, Popover } from "@operator-ds/react";
import type { EngineCallbacks, EngineState, GeoEngine, TileState } from "./engine-contract";
import { isGeoPoint, normalizeGeoView, sameGeoAnchor, sameGeoFrame } from "./geometry";
import { mapDataIssues } from "./renderer-data";
import type {
GeoAnnotation,
GeoEntity,
GeoFrame,
GeoMapProps,
GeoMarkerGroup,
GeoPoint,
} from "./types";
import { UtcStamp } from "./utc-stamp";
/** One shared empty collection, so a host that passes a new `[]` each render changes nothing. */
const NO_ANNOTATIONS: readonly GeoAnnotation[] = [];
const NO_POINTS: readonly GeoPoint[] = [];
const useBrowserLayoutEffect = typeof document === "undefined" ? useEffect : useLayoutEffect;
const finitePixel = (point: readonly number[] | null) =>
point !== null && point.length === 2 && point.every(Number.isFinite);
/** One engine start. Retiring it (dispose, failure, unmount) silences every callback it issued. */
interface EngineInstance {
live: boolean;
}
interface MarkerProps {
group: GeoMarkerGroup;
records: ReadonlyMap<string, GeoEntity>;
isSelected: boolean;
open: boolean;
/** The location choice made inside this group while it is open. */
choice: string | null;
/** The supplied selection, which a choice waits for; only read while the group is open. */
selectedId: string | null;
region: RefObject<HTMLDivElement | null>;
onOpenChange: (groupId: string, open: boolean, singleId: string | null) => void;
onChoose: (groupId: string, entityId: string, origin: HTMLElement) => void;
onPin: (groupId: string, entityId: string) => void;
onCloseAutoFocus: (groupId: string, event: Event) => void;
}
const sameIds = (a: readonly string[], b: readonly string[]) =>
a === b || (a.length === b.length && a.every((item, index) => item === b[index]));
/** A marker is drawn again for what it shows, not for where it is: a pan only moves its wrapper. */
const sameMarker = (previous: MarkerProps, next: MarkerProps) =>
previous.group.id === next.group.id &&
sameIds(previous.group.ids, next.group.ids) &&
previous.records === next.records &&
previous.isSelected === next.isSelected &&
previous.open === next.open &&
previous.choice === next.choice &&
previous.selectedId === next.selectedId &&
previous.region === next.region &&
previous.onOpenChange === next.onOpenChange &&
previous.onChoose === next.onChoose &&
previous.onPin === next.onPin &&
previous.onCloseAutoFocus === next.onCloseAutoFocus;
const ClusterMarker = memo(function ClusterMarker({
group,
records,
isSelected,
open,
choice,
selectedId,
region,
onOpenChange,
onChoose,
onPin,
onCloseAutoFocus,
}: MarkerProps) {
const members = group.ids.flatMap((entityId) =>
records.has(entityId) ? [records.get(entityId)!] : [],
);
const selected =
choice && choice === selectedId && group.ids.includes(choice) ? records.get(choice) : undefined;
const single = members.length === 1 ? members[0] : undefined;
const label = single
? `${single.record.name} — ${single.record.id}`
: `${members.length} equipment at this location`;
return (
<Popover
title={selected ? "Equipment preview" : "Equipment at this location"}
open={open}
onOpenChange={(next) => onOpenChange(group.id, next, single?.record.id ?? null)}
returnFocusRef={region}
onCloseAutoFocus={(event) => onCloseAutoFocus(group.id, event)}
content={
<div className="flex max-w-[calc(var(--oprt-space-8)*5)] flex-col gap-2u">
{selected ? (
<>
<EntityPreview
entity={{
...selected.record,
facts: [
...selected.record.facts.map((fact) => ({
...fact,
id: `entity:${fact.id}`,
})),
{
id: "geo:position",
label: "Position",
value: selected.positionState,
},
{
id: "geo:observed",
label: "Observed",
value: <UtcStamp value={selected.observedAt} />,
mono: true,
},
],
}}
actions={
<Button size="sm" onClick={() => onPin(group.id, selected.record.id)}>
Pin in Inspector
</Button>
}
/>
</>
) : (
<>
<p className="m-0 normal-case">Choose a supplied record to preview its details.</p>
{members.map((entity) => (
<Button
key={entity.record.id}
size="sm"
variant="secondary"
className="!h-auto min-h-[var(--oprt-height-sm)] !whitespace-normal break-words text-left !normal-case"
onClick={(event) => onChoose(group.id, entity.record.id, event.currentTarget)}
>
{entity.record.name} — {entity.record.id}
</Button>
))}
{choice && (
<p role="status" className="normal-case">
Selection requested; waiting for the supplied selection.
</p>
)}
</>
)}
</div>
}
>
<Button
size="sm"
variant={isSelected ? "primary" : "secondary"}
aria-label={label}
aria-pressed={isSelected}
className={`whitespace-nowrap !normal-case${isSelected ? "" : " !bg-oprt-surface-1"}`}
>
{single ? single.record.id : members.length}
</Button>
</Popover>
);
}, sameMarker);
/**
* Optional renderer. All source, view and selection authority stays with its host.
*
* `snapshot`, `entities`, `annotations`, `measurement` and `layers` are compared by identity: the
* renderer redraws when the host supplies a new collection, and not when it supplies an equal one
* (a map of 2,000 reports cannot be compared by value on every pan frame). Keep a collection
* stable between changes, for example in state or memoized.
*/
export const GeoMap = memo(function GeoMap(props: GeoMapProps) {
const id = useId();
const target = useRef<HTMLDivElement>(null);
const region = useRef<HTMLDivElement>(null);
const adapter = useRef<GeoEngine | null>(null);
const instance = useRef<EngineInstance | null>(null);
const anchorFrame = useRef<GeoFrame | null>(null);
// The marker group whose preview or choices are open, for the engine callbacks, which never change
// identity and so cannot read the state.
const openGroupRef = useRef<string | null>(null);
const pinnedGroup = useRef<string | null>(null);
const choiceFocus = useRef<{
id: string;
groupId: string;
origin: HTMLElement;
dialog: HTMLElement;
source: string;
} | null>(null);
const { snapshot, entities, selectedId, layers, mode, tileSource } = props;
const annotations = props.annotations.length ? props.annotations : NO_ANNOTATIONS;
const measurement = props.measurement.length ? props.measurement : NO_POINTS;
// The view is a few numbers, not an object to compare: a pan changes these and nothing else.
const view = normalizeGeoView(props.view);
const [longitude, latitude] = view.center;
const { zoom, bearing } = view;
const tileUrl = tileSource?.url;
const tileAttribution = tileSource?.attribution;
const sourceKey = useMemo(
() => JSON.stringify([snapshot.id, snapshot.revision]),
[snapshot.id, snapshot.revision],
);
// What the engine draws. Its identity changes exactly when one of these inputs does, and it is
// the stamp that tells a current engine callback from one the next update superseded.
const state = useMemo<EngineState>(
() => ({
snapshot,
entities,
selectedId,
view: { center: [longitude, latitude], zoom, bearing },
layers,
annotations,
measurement,
mode,
...(tileUrl !== undefined && tileAttribution !== undefined
? { tileSource: { url: tileUrl, attribution: tileAttribution } }
: {}),
}),
[
snapshot,
entities,
selectedId,
longitude,
latitude,
zoom,
bearing,
layers,
annotations,
measurement,
mode,
tileUrl,
tileAttribution,
],
);
// The supplied data is checked once per change of the data, never for a change of the view.
const issues = useMemo(
() => mapDataIssues({ snapshot, entities, annotations, measurement }),
[snapshot, entities, annotations, measurement],
);
const positionedIds = useMemo(
() =>
new Set(
entities.filter((entity) => isGeoPoint(entity.position)).map((entity) => entity.record.id),
),
[entities],
);
const records = useMemo(
() => new Map(entities.map((entity) => [entity.record.id, entity])),
[entities],
);
const enabled = !props.disabled && !issues.duplicates && snapshot.availability !== "unavailable";
const latest = useRef({ props, state, enabled, positionedIds });
latest.current = { props, state, enabled, positionedIds };
const [attempt, setAttempt] = useState(0);
const [status, setStatus] = useState<"loading" | "ready" | "error">("loading");
const [error, setError] = useState("");
const [frame, setFrame] = useState<GeoFrame | null>(null);
const [tileState, setTileState] = useState<TileState>("loading");
const [openGroup, setOpenGroup] = useState<string | null>(null);
openGroupRef.current = openGroup;
const [choice, setChoice] = useState<string | null>(null);
/** Callbacks for one engine start and one state; they go quiet once either is superseded. */
const makeCallbacks = useCallback(
(expected: EngineState, owner: EngineInstance): EngineCallbacks => {
const current = () =>
owner.live && latest.current.enabled && latest.current.state === expected;
return {
onFrame(next) {
if (!current()) return;
const ids = latest.current.positionedIds;
if (
next.visibleIds.some((entityId) => !ids.has(entityId)) ||
new Set(next.visibleIds).size !== next.visibleIds.length ||
next.groups.some(
(group) =>
!isGeoPoint(group.point) ||
!finitePixel(group.pixel) ||
!group.ids.length ||
group.ids.some((entityId) => !ids.has(entityId)) ||
new Set(group.ids).size !== group.ids.length,
) ||
(next.selectedPixel !== null && !finitePixel(next.selectedPixel)) ||
(next.metersPerPixel !== null &&
(!Number.isFinite(next.metersPerPixel) || next.metersPerPixel <= 0))
)
return;
// What is open belongs to its marker group, not to the pixel it is drawn at. A frame that
// only moves the view (Fit map, a zoom, a pan, or the second frame of the renderer settling)
// moves the marker and what is open from it; it is dismissed when its group is gone or its
// equipment moved on the ground.
const open = openGroupRef.current;
if (open !== null && !sameGeoAnchor(anchorFrame.current, next, open)) {
choiceFocus.current = null;
openGroupRef.current = null;
setOpenGroup(null);
setChoice(null);
}
anchorFrame.current = next;
setFrame((previous) => (sameGeoFrame(previous, next) ? previous : next));
latest.current.props.onFrame(next);
},
onViewChange(next) {
if (current()) latest.current.props.onViewChange(normalizeGeoView(next));
},
onPoint(point) {
if (current() && latest.current.props.mode !== "inspect" && isGeoPoint(point))
latest.current.props.onPoint([point[0], point[1]]);
},
onTileState(next) {
if (current()) setTileState(next);
},
};
},
[],
);
useEffect(() => {
// This start owns the callbacks it issues. Retiring it is a write to its own object, not to a
// counter held in a ref, so the cleanup reads nothing that React might have moved on.
const owner: EngineInstance = { live: true };
instance.current = owner;
anchorFrame.current = null;
choiceFocus.current = null;
setFrame(null);
setOpenGroup(null);
setChoice(null);
latest.current.props.onFrame(null);
if (!enabled || !target.current) return;
setStatus("loading");
setError("");
setTileState("loading");
void import("./engine")
.then(({ createGeoEngine }) => {
if (!owner.live || !latest.current.enabled || !target.current) return;
const current = latest.current;
adapter.current = createGeoEngine(
target.current,
current.state,
makeCallbacks(current.state, owner),
);
setStatus("ready");
})
.catch((cause: unknown) => {
if (!owner.live) return;
owner.live = false;
adapter.current?.dispose();
adapter.current = null;
setError(cause instanceof Error ? cause.message : "Map renderer could not start.");
setStatus("error");
setFrame(null);
latest.current.props.onFrame(null);
});
return () => {
owner.live = false;
adapter.current?.dispose();
adapter.current = null;
latest.current.props.onFrame(null);
};
}, [enabled, attempt, makeCallbacks]);
useEffect(() => {
const owner = instance.current;
if (!adapter.current || !enabled || !owner?.live) return;
try {
adapter.current.update(state, makeCallbacks(state, owner));
} catch (cause: unknown) {
adapter.current.dispose();
adapter.current = null;
owner.live = false;
setError(cause instanceof Error ? cause.message : "Map renderer could not update.");
setStatus("error");
setFrame(null);
latest.current.props.onFrame(null);
}
}, [state, enabled, makeCallbacks]);
useEffect(() => {
const leave = (event: Event) => {
const pending = choiceFocus.current;
if (pending && !pending.dialog.contains(event.target as Node | null))
choiceFocus.current = null;
};
const blur = (event: FocusEvent) => {
const pending = choiceFocus.current;
// A still-connected choice explicitly blurred to nowhere is a departure;
// removing the focused choice during acceptance is handled after commit.
if (
pending &&
event.target === pending.origin &&
pending.origin.isConnected &&
!event.relatedTarget
)
choiceFocus.current = null;
};
document.addEventListener("focusin", leave, true);
document.addEventListener("pointerdown", leave, true);
document.addEventListener("focusout", blur, true);
return () => {
choiceFocus.current = null;
document.removeEventListener("focusin", leave, true);
document.removeEventListener("pointerdown", leave, true);
document.removeEventListener("focusout", blur, true);
};
}, []);
useBrowserLayoutEffect(() => {
const pending = choiceFocus.current;
if (!pending) return;
if (
!enabled ||
status !== "ready" ||
pending.groupId !== openGroup ||
pending.id !== choice ||
pending.source !== sourceKey ||
!pending.dialog.isConnected
) {
choiceFocus.current = null;
return;
}
if (selectedId !== pending.id) return;
choiceFocus.current = null;
const active = document.activeElement;
if (
pending.dialog.contains(active) ||
(active === document.body && !pending.origin.isConnected)
)
pending.dialog.focus({ preventScroll: true });
}, [choice, selectedId, openGroup, enabled, status, sourceKey]);
// The marker handlers read the latest props and write state, so they never change identity and
// a marker is not drawn again because the map around it was.
const onMarkerOpenChange = useCallback(
(groupId: string, open: boolean, singleId: string | null) => {
setOpenGroup(open ? groupId : null);
choiceFocus.current = null;
if (open) {
setChoice(singleId);
if (singleId) latest.current.props.onSelectedIdChange(singleId);
}
},
[],
);
const onMarkerChoose = useCallback(
(groupId: string, entityId: string, origin: HTMLElement) => {
const dialog = origin.closest<HTMLElement>("[role=dialog]");
choiceFocus.current = dialog
? { id: entityId, groupId, origin, dialog, source: sourceKey }
: null;
setChoice(entityId);
latest.current.props.onSelectedIdChange(entityId);
},
[sourceKey],
);
const onMarkerPin = useCallback((groupId: string, entityId: string) => {
pinnedGroup.current = groupId;
setOpenGroup(null);
latest.current.props.onInspect(entityId);
}, []);
const onMarkerCloseAutoFocus = useCallback((groupId: string, event: Event) => {
if (pinnedGroup.current === groupId) {
pinnedGroup.current = null;
event.preventDefault();
}
}, []);
const entityLayer = layers.find((layer) => layer.id === "entities");
const groups =
enabled &&
status === "ready" &&
mode === "inspect" &&
entityLayer?.visible &&
entityLayer.opacity > 0
? (frame?.groups ?? [])
: [];
return (
<section
aria-labelledby={`${id}-title`}
className={`min-w-0 space-y-2u font-sans text-oprt-base text-oprt-text ${props.className ?? ""}`}
>
<h3
id={`${id}-title`}
className="m-0 text-oprt-base font-medium uppercase tracking-oprt-base"
>
Equipment map
</h3>
<p id={`${id}-help`} className="sr-only">
Focus the viewport and use arrow keys to pan, plus or minus to zoom. Use equipment markers
for location choices. Equipment records remain available for inspection, including unknown
positions.
</p>
{issues.invalid > 0 && (
<p role="status">
{issues.invalid} invalid geometr{issues.invalid === 1 ? "y" : "ies"} excluded from the
map. Review supplied coordinates in the table.{" "}
{issues.uncertainty > 0 &&
`${issues.uncertainty} uncertainty footprint${issues.uncertainty === 1 ? " is" : "s are"} excluded because of an invalid radius or unsupported projection bounds.`}
</p>
)}
{issues.unknown > 0 && (
<p>
{issues.unknown} record{issues.unknown === 1 ? " has" : "s have"} an unknown position.
</p>
)}
{issues.duplicates ? (
<p role="alert">
Duplicate or empty IDs prevent unambiguous map selection. Correct the supplied source; the
equipment records remain available.
</p>
) : props.disabled ? (
<p role="status">Map disabled. Use the table to review equipment.</p>
) : snapshot.availability === "unavailable" ? (
<p role="status">Map source unavailable. Use the table and source recovery controls.</p>
) : null}
<div
ref={region}
role="group"
aria-label="Map viewport"
aria-describedby={`${id}-help`}
tabIndex={enabled && status === "ready" ? 0 : -1}
className="relative h-[calc(var(--oprt-space-8)*8)] min-w-0 overflow-hidden border border-oprt-border bg-oprt-surface-2 outline-none focus-visible:border-oprt-border-focus focus-visible:shadow-oprt-focus focus-visible:outline focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-oprt-border-focus forced-colors:focus-visible:outline-[CanvasText]"
>
<div
ref={target}
aria-hidden="true"
role="presentation"
className="absolute inset-0 [&_.ol-viewport]:!touch-none"
/>
{enabled && status === "loading" && (
<p role="status" className="absolute inset-x-0 top-0 m-0 bg-oprt-surface-1 p-2u">
Loading map renderer…
</p>
)}
{enabled && status === "error" && (
<div className="absolute inset-0 flex flex-col items-start gap-2u bg-oprt-surface-1 p-3u">
<p role="alert">Map renderer unavailable: {error}</p>
<Button size="sm" onClick={() => setAttempt((value) => value + 1)}>
Retry map
</Button>
</div>
)}
{groups.map((group) => {
if (!group.ids.every((entityId) => records.has(entityId))) return null;
const open = openGroup === group.id;
return (
<div
key={group.id}
className="absolute -translate-x-1/2 -translate-y-1/2"
style={{ left: group.pixel[0], top: group.pixel[1] }}
>
<ClusterMarker
group={group}
records={records}
isSelected={selectedId !== null && group.ids.includes(selectedId)}
open={open}
choice={open ? choice : null}
selectedId={open ? selectedId : null}
region={region}
onOpenChange={onMarkerOpenChange}
onChoose={onMarkerChoose}
onPin={onMarkerPin}
onCloseAutoFocus={onMarkerCloseAutoFocus}
/>
</div>
);
})}
</div>
{enabled && tileSource && (
<div className="flex flex-wrap items-center gap-2u text-oprt-text-dim">
<span className="break-words [overflow-wrap:anywhere]">{tileSource.attribution}</span>
{tileState === "loading" && <span role="status">Loading background tiles…</span>}
{tileState === "error" && (
<>
<span role="status">
Background tiles unavailable. Local vectors and the table remain available.
</span>
<Button size="sm" variant="tertiary" onClick={() => setAttempt((value) => value + 1)}>
Retry tiles
</Button>
</>
)}
</div>
)}
</section>
);
});
patterns/geospatial-workspace/engine-contract.ts
import type { GeoFrame, GeoMapProps, GeoPoint, GeoView } from "./types";
export type EngineState = Pick<
GeoMapProps,
| "snapshot"
| "entities"
| "selectedId"
| "view"
| "layers"
| "annotations"
| "measurement"
| "mode"
| "tileSource"
>;
export type TileState = "loading" | "ready" | "error";
export interface EngineCallbacks {
onFrame: (frame: GeoFrame) => void;
onViewChange: (view: GeoView) => void;
onPoint: (point: GeoPoint) => void;
onTileState: (state: TileState) => void;
}
export interface GeoEngine {
update: (state: EngineState, callbacks: EngineCallbacks) => void;
dispose: () => void;
}
patterns/geospatial-workspace/types.ts
import type { EntityPreviewRecord, LayerControlItem } from "@operator-ds/react";
/** WGS84 longitude, latitude in decimal degrees. */
export type GeoPoint = readonly [number, number];
export interface GeoView {
center: GeoPoint;
zoom: number;
bearing: number;
}
export interface GeoEntity {
record: EntityPreviewRecord;
position: GeoPoint | null;
positionState: "reported" | "last-known" | "unknown";
observedAt: string | null;
uncertaintyMeters?: number;
coverage?: readonly GeoPoint[];
track?: readonly { position: GeoPoint; observedAt: string }[];
}
export interface GeoSiteFeature {
id: string;
label: string;
kind: "building" | "road" | "water" | "boundary";
points: readonly GeoPoint[];
}
export interface GeoSnapshot {
id: string;
title?: string;
revision: string;
source: string;
observedAt: string | null;
availability: "current" | "partial" | "offline" | "unavailable";
detail?: string;
entities: readonly GeoEntity[];
site: readonly GeoSiteFeature[];
}
export interface GeoAnnotation {
id: string;
label: string;
position: GeoPoint;
sourceId: string;
createdAt: string;
}
export interface GeoAnnotationDraft {
label: string;
position: GeoPoint;
sourceId: string;
}
export type GeoAnnotationResult =
| { status: "saved"; annotation: GeoAnnotation }
| { status: "failed"; message: string };
export interface GeoBookmark {
id: string;
name: string;
view: GeoView;
layers: readonly LayerControlItem[];
}
export interface GeoMarkerGroup {
id: string;
ids: readonly string[];
point: GeoPoint;
pixel: readonly [number, number];
}
export interface GeoFrame {
view: GeoView;
visibleIds: readonly string[];
groups: readonly GeoMarkerGroup[];
selectedPixel: readonly [number, number] | null;
metersPerPixel: number | null;
}
export interface GeoTileSource {
url: string;
attribution: string;
}
export type GeoMapMode = "inspect" | "measure" | "annotate";
export interface GeoMapProps {
snapshot: GeoSnapshot;
entities: readonly GeoEntity[];
selectedId: string | null;
onSelectedIdChange: (id: string | null) => void;
view: GeoView;
onViewChange: (view: GeoView) => void;
layers: readonly LayerControlItem[];
annotations: readonly GeoAnnotation[];
measurement: readonly GeoPoint[];
mode: GeoMapMode;
onPoint: (point: GeoPoint) => void;
onFrame: (frame: GeoFrame | null) => void;
onInspect: (id: string) => void;
tileSource?: GeoTileSource;
disabled?: boolean;
className?: string;
}
export interface GeospatialWorkspaceProps {
snapshot: GeoSnapshot;
selectedId: string | null;
onSelectedIdChange: (id: string | null) => void;
annotations: readonly GeoAnnotation[];
onCreateAnnotation?: (draft: GeoAnnotationDraft) => Promise<GeoAnnotationResult>;
onRemoveAnnotation?: (id: string) => void;
bookmarks: readonly GeoBookmark[];
onBookmarksChange: (bookmarks: readonly GeoBookmark[]) => void;
initialView?: GeoView;
tileSource?: GeoTileSource;
}
patterns/geospatial-workspace/geometry.ts
import type { MapAction } from "@operator-ds/react";
import type { GeoEntity, GeoFrame, GeoPoint, GeoView } from "./types";
export const MERCATOR_LATITUDE = 85.05112878;
const radians = Math.PI / 180;
const wrap = (value: number, period: number) => ((value % period) + period) % period;
export const normalizeLongitude = (longitude: number) => wrap(longitude + 180, 360) - 180;
const finite = (value: unknown, fallback: number): number =>
typeof value === "number" && Number.isFinite(value) ? value : fallback;
const clamp = (value: number, min: number, max: number) => Math.min(max, Math.max(min, value));
const mercatorY = (latitude: number) =>
Math.log(Math.tan(Math.PI / 4 + (latitude * radians) / 2)) / (2 * Math.PI);
const latitudeFromY = (y: number) =>
(2 * Math.atan(Math.exp(y * 2 * Math.PI)) - Math.PI / 2) / radians;
export function isGeoPoint(value: unknown): value is GeoPoint {
return (
Array.isArray(value) &&
value.length === 2 &&
value.every((axis) => typeof axis === "number" && Number.isFinite(axis)) &&
Math.abs(value[0]) <= 180 &&
Math.abs(value[1]) <= MERCATOR_LATITUDE
);
}
export function normalizeGeoView(view: GeoView): GeoView {
return {
center: [
normalizeLongitude(finite(view?.center?.[0], 0)),
clamp(finite(view?.center?.[1], 0), -MERCATOR_LATITUDE, MERCATOR_LATITUDE),
],
zoom: clamp(finite(view?.zoom, 2), 2, 20),
bearing: wrap(finite(view?.bearing, 0), 360),
};
}
export function distanceMeters(a: GeoPoint, b: GeoPoint): number | null {
if (!isGeoPoint(a) || !isGeoPoint(b)) return null;
const dLat = (b[1] - a[1]) * radians,
dLon = normalizeLongitude(b[0] - a[0]) * radians;
const arc =
Math.sin(dLat / 2) ** 2 +
Math.cos(a[1] * radians) * Math.cos(b[1] * radians) * Math.sin(dLon / 2) ** 2;
return 2 * 6371008.8 * Math.asin(Math.sqrt(clamp(arc, 0, 1)));
}
export function getFitView(entities: readonly GeoEntity[]): GeoView {
const points = entities.flatMap((entity) =>
isGeoPoint(entity.position) ? [entity.position] : [],
);
if (!points.length) return { center: [0, 0], zoom: 2, bearing: 0 };
const longitudes = points.map((point) => wrap(point[0], 360)).sort((a, b) => a - b);
let largestGap = -1,
start = longitudes[0]!;
for (let index = 0; index < longitudes.length; index++) {
const next =
longitudes[(index + 1) % longitudes.length]! + (index === longitudes.length - 1 ? 360 : 0);
const gap = next - longitudes[index]!;
if (gap > largestGap) {
largestGap = gap;
start = next;
}
}
const span = 360 - largestGap;
const ys = points.map((point) => mercatorY(point[1]));
const low = Math.min(...ys),
high = Math.max(...ys);
const fraction = Math.max(span / 360, high - low);
return normalizeGeoView({
center: [start + span / 2, latitudeFromY((low + high) / 2)],
zoom: fraction > 0 ? Math.floor(Math.log2(0.7 / fraction)) : 16,
bearing: 0,
});
}
export function moveGeoView(
view: GeoView,
action: MapAction,
entities: readonly GeoEntity[],
): GeoView {
const next = normalizeGeoView(view);
if (action === "fit") return getFitView(entities);
const step = 0.25 / 2 ** next.zoom;
return normalizeGeoView({
center: [
next.center[0] + (action === "pan-east" ? 1 : action === "pan-west" ? -1 : 0) * step * 360,
latitudeFromY(
mercatorY(next.center[1]) +
(action === "pan-north" ? 1 : action === "pan-south" ? -1 : 0) * step,
),
],
zoom: next.zoom + (action === "zoom-in" ? 1 : action === "zoom-out" ? -1 : 0),
bearing: action === "reset-north" ? 0 : next.bearing,
});
}
/** Approximate spherical footprint. A rejected cap is omitted and counted by the host. */
export function getUncertaintyFootprint(
center: GeoPoint,
radius: number,
): readonly GeoPoint[] | null {
if (!isGeoPoint(center) || !Number.isFinite(radius) || radius < 0) return null;
if (radius === 0) return [];
const angularRadius = radius / 6371008.8;
// Check the complete cap, including its interior, before sampling its boundary.
if (Math.abs(center[1]) + angularRadius / radians > MERCATOR_LATITUDE) return null;
const latitude = center[1] * radians;
const sinLatitude = Math.sin(latitude),
cosLatitude = Math.cos(latitude);
const sinRadius = Math.sin(angularRadius),
cosRadius = Math.cos(angularRadius);
const points: GeoPoint[] = Array.from({ length: 64 }, (_, index) => {
const bearing = (2 * Math.PI * index) / 64;
const nextLatitude = Math.asin(
clamp(sinLatitude * cosRadius + cosLatitude * sinRadius * Math.cos(bearing), -1, 1),
);
const deltaLongitude = Math.atan2(
Math.sin(bearing) * sinRadius * cosLatitude,
cosRadius - sinLatitude * Math.sin(nextLatitude),
);
return [normalizeLongitude(center[0] + deltaLongitude / radians), nextLatitude / radians];
});
return points.every(isGeoPoint) ? points : null;
}
const same = (a: number, b: number) => a === b || (Number.isNaN(a) && Number.isNaN(b));
const samePair = (a: readonly number[], b: readonly number[]) =>
same(a[0]!, b[0]!) && same(a[1]!, b[1]!);
const sameList = (a: readonly string[], b: readonly string[]) =>
a === b || (a.length === b.length && a.every((item, index) => item === b[index]));
/**
* Whether two map frames report the same view, extent, markers and scale. Frames come about every
* animation frame, so this walks them once instead of serializing them to compare the text.
*/
export function sameGeoFrame(a: GeoFrame | null, b: GeoFrame | null): boolean {
if (a === b) return true;
if (!a || !b) return false;
if (
!samePair(a.view.center, b.view.center) ||
!same(a.view.zoom, b.view.zoom) ||
!same(a.view.bearing, b.view.bearing) ||
!sameList(a.visibleIds, b.visibleIds) ||
a.groups.length !== b.groups.length ||
(a.selectedPixel === null) !== (b.selectedPixel === null) ||
(a.selectedPixel !== null && !samePair(a.selectedPixel, b.selectedPixel!)) ||
(a.metersPerPixel === null) !== (b.metersPerPixel === null) ||
(a.metersPerPixel !== null && !same(a.metersPerPixel, b.metersPerPixel!))
)
return false;
return a.groups.every((group, index) => {
const other = b.groups[index]!;
return (
group.id === other.id &&
sameList(group.ids, other.ids) &&
samePair(group.point, other.point) &&
samePair(group.pixel, other.pixel)
);
});
}
/**
* Whether the marker group `groupId` is still anchored in `after`: the frame draws a group with that
* id (made from its members) and, where `before` had it too, at the same point on the ground. Its
* pixel and the view around it are left out on purpose: a marker moves with the map, so whatever is
* open from the marker (a preview, a list of choices) moves with it. An open marker is dismissed when
* its group is gone (out of the viewport, regrouped) or when its equipment has moved on the ground.
*/
export function sameGeoAnchor(before: GeoFrame | null, after: GeoFrame, groupId: string): boolean {
const next = after.groups.find((group) => group.id === groupId);
if (!next) return false;
const previous = before?.groups.find((group) => group.id === groupId);
return !previous || samePair(previous.point, next.point);
}
patterns/geospatial-workspace/renderer-data.ts
import { getUncertaintyFootprint, isGeoPoint } from "./geometry";
import type { EngineState } from "./engine-contract";
/** The inputs the issues depend on. The view, selection and layers do not change them. */
export type MapDataInput = Pick<
EngineState,
"snapshot" | "entities" | "annotations" | "measurement"
>;
export function mapDataIssues(state: MapDataInput): {
duplicates: boolean;
invalid: number;
unknown: number;
uncertainty: number;
} {
const duplicate = (ids: readonly string[]) =>
ids.some((id) => typeof id !== "string" || !id.trim()) || new Set(ids).size !== ids.length;
const duplicates =
duplicate(state.entities.map((entity) => entity.record.id)) ||
duplicate(state.snapshot.entities.map((entity) => entity.record.id)) ||
duplicate(state.snapshot.site.map((feature) => feature.id)) ||
duplicate(state.annotations.map((annotation) => annotation.id));
let invalid = 0,
unknown = 0,
uncertainty = 0;
for (const entity of state.entities) {
if (entity.position === null) unknown++;
else if (!isGeoPoint(entity.position)) invalid++;
if (entity.coverage && (entity.coverage.length < 3 || !entity.coverage.every(isGeoPoint)))
invalid++;
if (
entity.track &&
(entity.track.length < 2 || !entity.track.every((point) => isGeoPoint(point.position)))
)
invalid++;
if (
entity.uncertaintyMeters !== undefined &&
(!Number.isFinite(entity.uncertaintyMeters) ||
entity.uncertaintyMeters < 0 ||
(isGeoPoint(entity.position) &&
getUncertaintyFootprint(entity.position, entity.uncertaintyMeters) === null))
) {
invalid++;
uncertainty++;
}
}
for (const feature of state.snapshot.site)
if (
feature.points.length < (feature.kind === "road" ? 2 : 3) ||
!feature.points.every(isGeoPoint)
)
invalid++;
for (const annotation of state.annotations) if (!isGeoPoint(annotation.position)) invalid++;
for (const point of state.measurement) if (!isGeoPoint(point)) invalid++;
return { duplicates, invalid, unknown, uncertainty };
}
patterns/geospatial-workspace/utc-stamp.tsx
import { formatUtcInstant } from "../operational-domain";
/**
* A supplied instant as "YYYY-MM-DD HH:MM:SS UTC" in a <time> element. The date and the time with
* its zone are separate runs, so a narrow column breaks between them and never inside one. Text
* that is not an exact instant is shown as supplied, so a malformed date is never reinterpreted.
*/
export function UtcStamp({
value,
fallback = "Time unknown",
}: {
value: string | null | undefined;
fallback?: string;
}) {
if (!value) return <>{fallback}</>;
const text = formatUtcInstant(value);
if (text === value) return <>{value}</>;
return (
<time dateTime={new Date(value).toISOString()}>
<span className="inline-block">{text.slice(0, 10)}</span>{" "}
<span className="inline-block">{text.slice(11)}</span>
</time>
);
}
patterns/operational-domain.ts
/** Fixture context used by reusable application recipes. */
export type OperationalDomain = "military" | "industrial";
export interface UtcInstantOptions {
/**
* Whether the milliseconds are shown. "auto" (the default) shows them only when the supplied
* instant carries a non-zero fraction, because sub-second timing matters only where it exists.
*/
milliseconds?: "auto" | "always" | "never";
}
const INSTANT =
/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{1,3}))?(Z|[+-]\d{2}:\d{2})$/;
/**
* Reads an ISO 8601 instant as "YYYY-MM-DD HH:MM:SS UTC", with ".mmm" after the seconds where the
* options ask for it. Text that is not a real instant (an invented date such as 30 February, or
* free text) is returned as supplied rather than reinterpreted. It never uses Intl, so the server
* and every browser print the same characters.
*/
export function formatUtcInstant(value: string, options: UtcInstantOptions = {}): string {
const parts = INSTANT.exec(value);
if (!parts) return value;
const [year, month, day, hour, minute, second] = parts.slice(1, 7).map(Number) as [
number,
number,
number,
number,
number,
number,
];
const calendar = new Date(Date.UTC(year, month - 1, day));
// Date rolls an invented day into the next month; compare it back to what was written.
if (
calendar.getUTCFullYear() !== year ||
calendar.getUTCMonth() !== month - 1 ||
calendar.getUTCDate() !== day ||
hour > 23 ||
minute > 59 ||
second > 59
)
return value;
const fraction = (parts[7] ?? "").padEnd(3, "0");
const parsed = new Date(`${value.slice(0, 19)}.${fraction}${parts[8]}`);
if (Number.isNaN(parsed.getTime())) return value;
const { milliseconds = "auto" } = options;
const showFraction = milliseconds === "always" || (milliseconds === "auto" && fraction !== "000");
const iso = parsed.toISOString();
return `${iso.slice(0, 10)} ${iso.slice(11, showFraction ? 23 : 19)} UTC`;
}
/**
* Reads epoch milliseconds as "YYYY-MM-DD HH:MM:SS UTC", with the same options as
* formatUtcInstant. A value that is not a real time reads "Unknown time" rather than throwing.
*/
export function formatUtcEpoch(ms: number, options: UtcInstantOptions = {}): string {
const date = new Date(ms);
if (!Number.isFinite(ms) || Number.isNaN(date.getTime())) return "Unknown time";
return formatUtcInstant(date.toISOString(), options);
}
patterns/geospatial-workspace/engine.ts
import Map from "ol/Map.js";
import View from "ol/View.js";
import Feature from "ol/Feature.js";
import Point from "ol/geom/Point.js";
import LineString from "ol/geom/LineString.js";
import Polygon from "ol/geom/Polygon.js";
import Geometry from "ol/geom/Geometry.js";
import VectorLayer from "ol/layer/Vector.js";
import TileLayer from "ol/layer/Tile.js";
import VectorSource from "ol/source/Vector.js";
import Cluster from "ol/source/Cluster.js";
import XYZ from "ol/source/XYZ.js";
import Style from "ol/style/Style.js";
import Fill from "ol/style/Fill.js";
import Stroke from "ol/style/Stroke.js";
import CircleStyle from "ol/style/Circle.js";
import Text from "ol/style/Text.js";
import { defaults as interactions } from "ol/interaction/defaults.js";
import KeyboardPan from "ol/interaction/KeyboardPan.js";
import KeyboardZoom from "ol/interaction/KeyboardZoom.js";
import { fromLonLat, getPointResolution, toLonLat } from "ol/proj.js";
import { unByKey } from "ol/Observable.js";
import type { EventsKey } from "ol/events.js";
import type { Coordinate } from "ol/coordinate.js";
import type { StyleLike } from "ol/style/Style.js";
import type { EngineCallbacks, EngineState, GeoEngine } from "./engine-contract";
import { createFeatureTracker, unwrapLongitude, type FeatureData } from "./feature-data";
import { isGeoPoint, normalizeGeoView, normalizeLongitude, sameGeoFrame } from "./geometry";
import type { GeoFrame, GeoPoint, GeoView } from "./types";
const layerIds = [
"site",
"coverage",
"uncertainty",
"tracks",
"entities",
"measurement",
"annotations",
] as const;
type LayerId = (typeof layerIds)[number];
const radian = Math.PI / 180;
const publicPoint = (coordinate: Coordinate): GeoPoint => {
const point = toLonLat(coordinate);
return [normalizeLongitude(point[0]!), point[1]!];
};
const near = (a: number, b: number) => Math.abs(a - b) < 0.0000001;
const sameView = (a: GeoView, b: GeoView) =>
near(a.center[0], b.center[0]) &&
near(a.center[1], b.center[1]) &&
near(a.zoom, b.zoom) &&
near(a.bearing, b.bearing);
/** Loaded only by GeoMap's enabled client effect. It never creates a remote source by default. */
export function createGeoEngine(
target: HTMLElement,
initial: EngineState,
initialCallbacks: EngineCallbacks,
): GeoEngine {
let state = initial,
callbacks = initialCallbacks,
disposed = false;
let pendingFrame = 0,
lastFrame: GeoFrame | null = null,
tileKey = "",
tileFailed = false,
tileLoads = 0;
const keys: EventsKey[] = [],
tileKeys: EventsKey[] = [];
const features = createFeatureTracker();
const theme = getComputedStyle(target);
const token = (name: string) => theme.getPropertyValue(`--oprt-${name}`).trim();
const forced = window.matchMedia("(forced-colors: active)").matches;
const colors = {
text: forced ? "CanvasText" : token("text"),
muted: forced ? "CanvasText" : token("text-dim"),
surface: forced ? "Canvas" : token("surface-2"),
line: forced ? "CanvasText" : token("border-strong"),
accent: forced ? "Highlight" : token("accent"),
info: forced ? "CanvasText" : token("info"),
warning: forced ? "CanvasText" : token("warning"),
water: forced ? "Canvas" : token("info-subtle"),
};
if (Object.values(colors).some((value) => !value))
throw new Error("OPERATOR theme tokens are unavailable.");
const lineWidth = parseFloat(token("chart-stroke-width"));
const pointRadius = parseFloat(token("space-0-5"));
if (![lineWidth, pointRadius].every((value) => Number.isFinite(value) && value > 0))
throw new Error("OPERATOR geometry tokens are unavailable.");
const font = `${token("weight-sm")} ${token("type-base")} ${token("font-sans")}`;
const stroke = (color: string, dashed = false) =>
new Stroke({
color,
width: lineWidth,
...(dashed ? { lineDash: [pointRadius, pointRadius] } : {}),
});
const pointStyle = new Style({
image: new CircleStyle({
radius: pointRadius,
stroke: stroke(colors.accent),
fill: new Fill({ color: colors.surface }),
}),
});
// Styles are built once. OpenLayers asks for a style per feature on every render, so a function
// that built new objects would allocate a Stroke or Fill for each feature on each frame of a pan.
const coverageStyle = new Style({ stroke: stroke(colors.info, true) });
const uncertaintyStyle = new Style({ stroke: stroke(colors.warning, true) });
const markStyle = (color: string) =>
new Style({
stroke: stroke(color),
image: new CircleStyle({ radius: pointRadius, fill: new Fill({ color: colors.warning }) }),
});
const tracksStyle = markStyle(colors.accent);
const measurementStyle = markStyle(colors.warning);
// Site and annotation styles depend on the feature's kind and label (and on the zoom, for the
// site's labels), so they are kept by those values and shared between features.
const siteStyles = new globalThis.Map<string, Style>();
const annotationStyles = new globalThis.Map<string, Style>();
const siteStyle = (kind: string, label: string, labeled: boolean) => {
const key = labeled ? `${kind}\n${label}` : kind;
let style = siteStyles.get(key);
if (!style) {
style = new Style({
stroke: stroke(colors.line, kind === "boundary"),
fill: new Fill({ color: kind === "water" ? colors.water : colors.surface }),
...(labeled
? {
text: new Text({
text: label,
font,
placement: kind === "road" ? "line" : "point",
fill: new Fill({ color: colors.muted }),
stroke: new Stroke({ color: colors.surface, width: lineWidth * 3 }),
}),
}
: {}),
});
siteStyles.set(key, style);
}
return style;
};
const annotationStyle = (label: string) => {
let style = annotationStyles.get(label);
if (!style) {
style = new Style({
image: new CircleStyle({
radius: pointRadius,
fill: new Fill({ color: colors.warning }),
stroke: stroke(colors.text),
}),
text: new Text({
text: label,
font,
offsetY: -pointRadius * 3,
fill: new Fill({ color: colors.text }),
stroke: new Stroke({ color: colors.surface, width: lineWidth * 3 }),
}),
});
annotationStyles.set(label, style);
}
return style;
};
const sources = Object.fromEntries(
layerIds.map((id) => [id, new VectorSource<Feature<Geometry>>({ wrapX: false })]),
) as Record<LayerId, VectorSource<Feature<Geometry>>>;
const clusters = new Cluster({
source: sources.entities,
distance: 40,
minDistance: 0,
wrapX: false,
});
const layerStyles: Record<LayerId, StyleLike> = {
entities: pointStyle,
coverage: coverageStyle,
uncertainty: uncertaintyStyle,
tracks: tracksStyle,
measurement: measurementStyle,
site: (feature) =>
siteStyle(
feature.get("kind") as string,
feature.get("label") as string,
view.getZoom()! >= 16,
),
annotations: (feature) => annotationStyle(feature.get("label") as string),
};
const layers = Object.fromEntries(
layerIds.map((id) => [
id,
new VectorLayer({
source: id === "entities" ? clusters : sources[id],
declutter: id === "site" || id === "annotations" ? id : false,
style: layerStyles[id],
}),
]),
) as Record<LayerId, VectorLayer>;
const tileLayer = new TileLayer({ zIndex: -1 });
const normalized = normalizeGeoView(initial.view);
const view = new View({
center: fromLonLat([...normalized.center]),
zoom: normalized.zoom,
rotation: normalized.bearing * radian,
minZoom: 2,
maxZoom: 20,
constrainResolution: false,
multiWorld: true,
});
const keyboardTarget = target.parentElement ?? target;
const keyboardCondition = (event: import("ol/MapBrowserEvent.js").default) =>
event.originalEvent.target === keyboardTarget;
const controls = interactions({
keyboard: false,
altShiftDragRotate: false,
pinchRotate: false,
zoomDuration: 0,
});
controls.extend([
new KeyboardPan({ condition: keyboardCondition, duration: 0 }),
new KeyboardZoom({ condition: keyboardCondition, duration: 0 }),
]);
const map = new Map({
target,
view,
layers: [tileLayer, ...layerIds.map((id) => layers[id])],
controls: [],
interactions: controls,
keyboardEventTarget: keyboardTarget,
});
const actualView = (): GeoView =>
normalizeGeoView({
center: publicPoint(view.getCenter() ?? [0, 0]),
zoom: view.getZoom() ?? 2,
bearing: view.getRotation() / radian,
});
const worldLongitude = () => {
const extent = view.getProjection().getExtent();
return ((view.getCenter()?.[0] ?? 0) * 360) / (extent[2]! - extent[0]!);
};
const project = (point: GeoPoint, center: number) =>
fromLonLat([unwrapLongitude(point[0], center), point[1]]);
const lineCoordinates = (points: readonly GeoPoint[], center: number): Coordinate[] => {
let previous = center;
return points.map((point) => {
const longitude = previous + normalizeLongitude(point[0] - previous);
previous = longitude;
return fromLonLat([longitude, point[1]]);
});
};
const polygon = (points: readonly GeoPoint[], center: number) => {
const ring = lineCoordinates(points, center);
ring.push([...ring[0]!]);
return new Polygon([ring]);
};
function emitFrame() {
pendingFrame = 0;
if (disposed) return;
const size = map.getSize();
if (!size || size[0]! <= 0 || size[1]! <= 0) return;
const inViewport = (pixel: Coordinate | null): pixel is Coordinate =>
!!pixel &&
pixel.every(Number.isFinite) &&
pixel[0]! >= 0 &&
pixel[1]! >= 0 &&
pixel[0]! <= size[0]! &&
pixel[1]! <= size[1]!;
const visibleIds: string[] = [];
let selectedPixel: readonly [number, number] | null = null;
for (const feature of sources.entities.getFeatures()) {
const coordinate = (feature.getGeometry() as Point).getCoordinates();
const pixel = map.getPixelFromCoordinate(coordinate);
if (!inViewport(pixel)) continue;
const id = feature.get("entityId") as string;
visibleIds.push(id);
if (
id === state.selectedId &&
layers.entities.getVisible() &&
layers.entities.getOpacity() > 0
)
selectedPixel = [pixel[0]!, pixel[1]!];
}
const groupIds = new Set<string>();
const groups =
layers.entities.getVisible() && layers.entities.getOpacity() > 0
? clusters.getFeatures().flatMap((feature) => {
const coordinate = (feature.getGeometry() as Point).getCoordinates();
const pixel = map.getPixelFromCoordinate(coordinate);
if (!inViewport(pixel)) return [];
const ids = (feature.get("features") as Feature[])
.map((child) => child.get("entityId") as string)
.sort();
let hash = 2166136261;
for (const character of JSON.stringify(ids)) {
hash ^= character.charCodeAt(0);
hash = Math.imul(hash, 16777619);
}
const baseId = `equipment:${ids.length}:${(hash >>> 0).toString(36)}`;
let id = baseId,
suffix = 0;
while (groupIds.has(id)) id = `${baseId}:${++suffix}`;
groupIds.add(id);
return [
{ id, ids, point: publicPoint(coordinate), pixel: [pixel[0]!, pixel[1]!] as const },
];
})
: [];
const center = view.getCenter(),
resolution = view.getResolution();
const metersPerPixel =
center && resolution
? getPointResolution(view.getProjection(), resolution, center, "m")
: null;
const frame = {
view: actualView(),
visibleIds: visibleIds.sort(),
groups,
selectedPixel,
metersPerPixel,
};
if (!sameGeoFrame(lastFrame, frame)) {
lastFrame = frame;
callbacks.onFrame(frame);
}
}
const scheduleFrame = () => {
if (!disposed && !pendingFrame) pendingFrame = requestAnimationFrame(emitFrame);
};
function updateVectors(data: FeatureData) {
// Reproject at the current longitude so dateline neighbors remain adjacent.
const center = worldLongitude();
for (const source of Object.values(sources)) source.clear(true);
siteStyles.clear();
annotationStyles.clear();
const batches = Object.fromEntries(
layerIds.map((id) => [id, [] as Feature<Geometry>[]]),
) as Record<LayerId, Feature<Geometry>[]>;
for (const spec of data.specs) {
const geometry =
spec.shape === "point"
? new Point(project(spec.points[0]!, center))
: spec.shape === "line"
? new LineString(lineCoordinates(spec.points, center))
: polygon(spec.points, center);
batches[spec.layer].push(new Feature({ geometry, ...spec.properties }));
}
for (const id of layerIds) sources[id].addFeatures(batches[id]);
}
function updateTiles() {
const next = JSON.stringify(state.tileSource ?? null);
if (next === tileKey) return;
tileKey = next;
unByKey(tileKeys.splice(0));
tileLayer.getSource()?.dispose();
tileLayer.setSource(null);
tileFailed = false;
tileLoads = 0;
if (!state.tileSource) return;
try {
const url = new URL(state.tileSource.url, window.location.href);
if (!["http:", "https:"].includes(url.protocol) || !state.tileSource.attribution.trim())
throw new Error("Invalid tile source");
const source = new XYZ({ url: state.tileSource.url, crossOrigin: "anonymous", wrapX: true });
tileKeys.push(
source.on("tileloadstart", () => {
if (!disposed) {
tileLoads++;
if (!tileFailed) callbacks.onTileState("loading");
}
}),
source.on("tileloadend", () => {
if (!disposed) {
tileLoads = Math.max(0, tileLoads - 1);
if (!tileFailed && tileLoads === 0) callbacks.onTileState("ready");
}
}),
source.on("tileloaderror", () => {
if (!disposed) {
tileLoads = Math.max(0, tileLoads - 1);
tileFailed = true;
callbacks.onTileState("error");
}
}),
);
tileLayer.setSource(source);
callbacks.onTileState("loading");
} catch {
callbacks.onTileState("error");
}
}
function update(next: EngineState, nextCallbacks: EngineCallbacks) {
if (disposed) return;
state = next;
callbacks = nextCallbacks;
// The new callbacks have not been given a frame yet. One that the previous callbacks were
// refused (GeoMap ignores a callback superseded by this update) is delivered again.
lastFrame = null;
const requested = normalizeGeoView(state.view);
if (!sameView(actualView(), requested)) {
view.cancelAnimations();
view.setCenter(project(requested.center, requested.center[0]));
view.setZoom(requested.zoom);
view.setRotation(requested.bearing * radian);
}
// Features are redrawn when their inputs change, or when the view center crosses the seam at
// which one of them is drawn on another copy of the world. A pan inside a seam changes neither.
const redraw = features.sync(state, worldLongitude());
if (redraw) updateVectors(redraw);
for (const id of layerIds) {
const index = state.layers.findIndex((layer) => layer.id === id),
supplied = state.layers[index];
const validOpacity =
supplied &&
Number.isFinite(supplied.opacity) &&
supplied.opacity >= 0 &&
supplied.opacity <= 1;
layers[id].setVisible(!!supplied?.visible && !!validOpacity);
layers[id].setOpacity(validOpacity ? supplied.opacity : 0);
layers[id].setZIndex(index < 0 ? 0 : state.layers.length - index);
}
updateTiles();
map.updateSize();
map.render();
scheduleFrame();
}
keys.push(
map.on("postrender", scheduleFrame),
map.on("moveend", () => {
if (disposed) return;
const next = actualView();
if (!sameView(next, normalizeGeoView(state.view))) callbacks.onViewChange(next);
scheduleFrame();
}),
map.on("singleclick", (event) => {
if (disposed || state.mode === "inspect") return;
const point = publicPoint(event.coordinate);
if (isGeoPoint(point)) callbacks.onPoint(point);
}),
);
const observer = new ResizeObserver(() => {
if (!disposed) {
map.updateSize();
scheduleFrame();
}
});
observer.observe(target);
const dispose = () => {
if (disposed) return;
disposed = true;
observer.disconnect();
if (pendingFrame) cancelAnimationFrame(pendingFrame);
unByKey(keys);
unByKey(tileKeys);
clusters.setSource(null);
map.setTarget(undefined);
map.dispose();
clusters.dispose();
tileLayer.getSource()?.dispose();
tileLayer.dispose();
for (const id of layerIds) {
sources[id].dispose();
layers[id].dispose();
}
};
try {
update(initial, initialCallbacks);
} catch (error) {
dispose();
throw error;
}
return { update, dispose };
}
patterns/geospatial-workspace/feature-data.ts
import type { EngineState } from "./engine-contract";
import { getUncertaintyFootprint, isGeoPoint, normalizeLongitude } from "./geometry";
import type { GeoPoint } from "./types";
/** What the map draws and from where. Pure data: no OpenLayers, so it is unit-testable. */
export type FeatureLayer =
| "site"
| "coverage"
| "uncertainty"
| "tracks"
| "entities"
| "measurement"
| "annotations";
export interface FeatureSpec {
layer: FeatureLayer;
shape: "point" | "line" | "polygon";
/** A point has one position. A line or polygon ring is unwrapped from its first vertex. */
points: readonly GeoPoint[];
properties?: Readonly<Record<string, unknown>>;
}
export interface FeatureData {
/** In draw order: entities by ID, then site, annotations and measurement. */
specs: readonly FeatureSpec[];
/** The longitude each spec is wrapped from, one per spec. */
anchors: Float64Array;
}
type FeatureInputs = Pick<EngineState, "snapshot" | "entities" | "annotations" | "measurement">;
const compareIds = new Intl.Collator().compare;
/** The copy of a longitude that is nearest the view center, so shapes stay adjacent across ±180°. */
export const unwrapLongitude = (longitude: number, center: number) =>
center + normalizeLongitude(longitude - center);
/**
* How many whole turns separate a longitude from its nearest copy to the center. It is an integer
* that never decreases as the center moves east, and changes at exactly the center where
* {@link unwrapLongitude} switches to another copy (it uses the same arithmetic).
*/
const turns = (longitude: number, center: number) =>
Math.round((unwrapLongitude(longitude, center) - longitude) / 360);
/**
* Sums {@link turns} over every anchor. Each term only grows as the center moves east, so the sum
* is the same for two centers exactly when no feature is drawn on another copy of the world. A
* pan inside one seam leaves it alone; crossing a feature's seam changes it.
*/
export function seamSignature(anchors: Float64Array, center: number): number {
let sum = 0;
for (let index = 0; index < anchors.length; index++) sum += turns(anchors[index]!, center);
return sum;
}
/** Everything the supplied inputs draw, in the order the previous renderer added it. */
export function buildFeatureData(input: FeatureInputs): FeatureData {
const specs: FeatureSpec[] = [];
const entities = [...input.entities].sort((a, b) => compareIds(a.record.id, b.record.id));
for (const entity of entities) {
if (isGeoPoint(entity.position)) {
specs.push({
layer: "entities",
shape: "point",
points: [entity.position],
properties: { entityId: entity.record.id },
});
if (entity.uncertaintyMeters !== undefined) {
const footprint = getUncertaintyFootprint(entity.position, entity.uncertaintyMeters);
if (footprint?.length)
specs.push({ layer: "uncertainty", shape: "polygon", points: footprint });
}
}
if (entity.coverage && entity.coverage.length >= 3 && entity.coverage.every(isGeoPoint))
specs.push({ layer: "coverage", shape: "polygon", points: entity.coverage });
if (
entity.track &&
entity.track.length >= 2 &&
entity.track.every((sample) => isGeoPoint(sample.position))
)
specs.push({
layer: "tracks",
shape: "line",
points: entity.track.map((sample) => sample.position),
});
}
for (const feature of input.snapshot.site) {
if (
!feature.points.every(isGeoPoint) ||
feature.points.length < (feature.kind === "road" ? 2 : 3)
)
continue;
specs.push({
layer: "site",
shape: feature.kind === "road" ? "line" : "polygon",
points: feature.points,
properties: { kind: feature.kind, label: feature.label },
});
}
for (const annotation of input.annotations)
if (annotation.sourceId === input.snapshot.id && isGeoPoint(annotation.position))
specs.push({
layer: "annotations",
shape: "point",
points: [annotation.position],
properties: { label: annotation.label },
});
if (input.measurement.length && input.measurement.every(isGeoPoint)) {
for (const point of input.measurement)
specs.push({ layer: "measurement", shape: "point", points: [point] });
if (input.measurement.length >= 2)
specs.push({ layer: "measurement", shape: "line", points: input.measurement });
}
const anchors = new Float64Array(specs.length);
specs.forEach((spec, index) => {
anchors[index] = spec.points[0]![0];
});
return { specs, anchors };
}
/**
* Decides when the drawn features are out of date. The inputs are compared by identity (a host
* that changes a collection supplies a new one), the view only through {@link seamSignature}. It
* answers with the data to draw, or null when the features on the map are still right.
*/
export function createFeatureTracker() {
let inputs: FeatureInputs | null = null;
let data: FeatureData | null = null;
let signature = NaN;
return {
sync(next: FeatureInputs, center: number): FeatureData | null {
const sameInputs =
inputs !== null &&
data !== null &&
inputs.snapshot.id === next.snapshot.id &&
inputs.snapshot.revision === next.snapshot.revision &&
inputs.snapshot.site === next.snapshot.site &&
inputs.entities === next.entities &&
inputs.annotations === next.annotations &&
inputs.measurement === next.measurement;
if (!sameInputs || data === null) {
data = buildFeatureData(next);
inputs = {
snapshot: next.snapshot,
entities: next.entities,
annotations: next.annotations,
measurement: next.measurement,
};
signature = seamSignature(data.anchors, center);
return data;
}
const seams = seamSignature(data.anchors, center);
if (seams === signature) return null;
signature = seams;
return data;
},
};
}
patterns/facility-monitoring/fixtures.ts
import type { LayerControlItem } from "@operator-ds/react";
import { utilitySite } from "../geospatial-workspace/fixtures";
import { formatUtcEpoch } from "../operational-domain";
import type { GeoEntity, GeoPoint, GeoView } from "../geospatial-workspace/types";
import type { FacilityEquipment, FacilitySnapshot } from "./types";
export const facilityStart = Date.parse("2026-10-01T14:30:00Z");
export const initialFacilityView: GeoView = { center: [-122.3004, 37.8], zoom: 16, bearing: 0 };
export const initialFacilityLayers: readonly LayerControlItem[] = [
{ id: "entities", label: "Equipment", visible: true, opacity: 1 },
{ id: "tracks", label: "Reported tracks", visible: true, opacity: 0.8 },
{ id: "uncertainty", label: "Position uncertainty", visible: true, opacity: 0.65 },
{ id: "coverage", label: "Reported coverage", visible: true, opacity: 0.4 },
{ id: "site", label: "Local site plan", visible: true, opacity: 1 },
];
const source = "Harbor facility / synthetic training reference";
const at = (seconds: number) => facilityStart + seconds * 1_000;
const iso = (seconds: number) => new Date(at(seconds)).toISOString();
/** Operator-facing text reads "YYYY-MM-DD HH:MM:SS UTC", never the raw ISO string. */
const stamp = (seconds: number) => formatUtcEpoch(at(seconds), { milliseconds: "never" });
/** A number stays with its unit: the no-break space keeps "6.2" and "bar" on one line. */
const bar = (value: number) => `${value}\u00A0bar`;
const pumpPosition: GeoPoint = [-122.3018, 37.8005];
const yardPosition: GeoPoint = [-122.299, 37.7995];
function report(
id: string,
name: string,
seconds: number,
pressure: number | null,
position: GeoPoint | null,
quality: "current" | "stale" | "unknown" = "current",
capturedSeconds = seconds,
reportSource = source,
): FacilityEquipment["history"][number] {
const entity: GeoEntity = {
record: {
id,
name,
typeLabel: id === "PUMP-01" ? "Pump" : "Valve",
summary: "Supplied exercise report. Conditions and limits are application assertions.",
condition: {
label:
pressure === null
? "Pressure unknown"
: pressure > 7
? "Above supplied limit"
: "Within supplied range",
variant: pressure === null ? "neutral" : pressure > 7 ? "warning" : "success",
},
quality: {
state: quality,
source: reportSource,
updatedAt: at(capturedSeconds),
detail:
quality === "stale"
? `Report received at ${stamp(seconds)}; captured at ${stamp(capturedSeconds)} and explicitly marked stale by the fixture.`
: "Synthetic observation; no connection to deployed equipment.",
},
facts: [
{
id: "pressure",
label: "Pressure",
value: pressure === null ? "Unknown" : bar(pressure),
mono: true,
},
{ id: "limit", label: "Supplied upper limit", value: bar(7), mono: true },
{ id: "received", label: "Report received", value: stamp(seconds), mono: true },
],
},
position,
positionState: position === null ? "unknown" : quality === "stale" ? "last-known" : "reported",
observedAt: quality === "unknown" ? null : iso(capturedSeconds),
};
return { at: at(seconds), entity, pressure };
}
/** The supplied 65-second local clip keeps the 60-second review endpoint decodable. */
export function createFacilitySnapshot(mediaSrc: string): FacilitySnapshot {
return {
id: "facility-training-01",
title: "West utility plant",
source,
range: { start: facilityStart, end: at(60) },
liveTime: at(60),
equipment: [
{
id: "PUMP-01",
name: "Intake pump 01",
history: [
report("PUMP-01", "Intake pump 01", 0, 0, pumpPosition),
report("PUMP-01", "Intake pump 01", 10, 5.8, pumpPosition),
report("PUMP-01", "Intake pump 01", 20, 8.2, pumpPosition),
report("PUMP-01", "Intake pump 01", 35, 6.4, pumpPosition),
report("PUMP-01", "Intake pump 01", 40, 6.4, pumpPosition, "stale", 35),
report(
"PUMP-01",
"Intake pump 01",
50,
6.1,
pumpPosition,
"current",
50,
"Maintenance logger / alternate exercise source",
),
report("PUMP-01", "Intake pump 01", 60, 6.2, pumpPosition),
],
},
{
id: "VALVE-02",
name: "Yard isolation valve 02",
history: [
report("VALVE-02", "Yard isolation valve 02", 0, null, null, "unknown"),
report("VALVE-02", "Yard isolation valve 02", 15, 0, yardPosition),
report("VALVE-02", "Yard isolation valve 02", 40, null, yardPosition, "stale", 15),
],
},
{ id: "GAUGE-03", name: "Unreported portable gauge 03", history: [] },
],
cameras: [
{
id: "CAM-ALPHA",
name: "Pump room alpha",
equipmentId: "PUMP-01",
position: pumpPosition,
connection: "connected",
latencyMs: 0,
source,
canControl: true,
recordings: [
{
id: "alpha-before-gap",
start: facilityStart,
end: at(25),
src: mediaSrc,
mediaOffset: 0,
},
{ id: "alpha-after-gap", start: at(35), end: at(65), src: mediaSrc, mediaOffset: 35 },
],
},
{
id: "CAM-BRAVO",
name: "Yard bravo",
equipmentId: "VALVE-02",
position: yardPosition,
connection: "unavailable",
latencyMs: null,
source,
recordings: [],
canControl: false,
controlReason: "Camera control permission is not available for this exercise role.",
},
],
events: [
{
id: "pressure-rise",
label: "Pressure above supplied limit",
start: at(20),
severity: "warning",
lane: "Equipment",
equipmentId: "PUMP-01",
cameraId: "CAM-ALPHA",
description: `Synthetic pressure report: ${bar(8.2)} against the supplied ${bar(7)} limit.`,
},
{
id: "recording-gap",
label: "Recording unavailable",
start: at(25),
end: at(35),
severity: "neutral",
lane: "Camera",
equipmentId: "PUMP-01",
cameraId: "CAM-ALPHA",
description: "No recording was supplied for this interval. Review retains the shared time.",
},
{
id: "stale-report",
label: "Equipment report marked stale",
start: at(40),
severity: "warning",
lane: "Equipment",
equipmentId: "PUMP-01",
cameraId: "CAM-ALPHA",
description: `The report received at ${stamp(40)} retains the ${stamp(35)} observation.`,
},
{
id: "alternate-source",
label: "Alternate equipment source",
start: at(50),
severity: "info",
lane: "Equipment",
equipmentId: "PUMP-01",
cameraId: "CAM-ALPHA",
description:
"Equipment evidence came from the maintenance logger; camera footage keeps its own source.",
},
],
site: utilitySite,
};
}
patterns/geospatial-workspace/fixtures.ts
import type { LayerControlItem } from "@operator-ds/react";
import type { GeoEntity, GeoPoint, GeoSiteFeature, GeoSnapshot, GeoView } from "./types";
export const initialGeoView: GeoView = { center: [-122.3, 37.8], zoom: 16, bearing: 0 };
export const initialGeoLayers: readonly LayerControlItem[] = [
{ id: "annotations", label: "Annotations", visible: true, opacity: 1 },
{ id: "measurement", label: "Measurement", visible: true, opacity: 1 },
{ id: "entities", label: "Equipment", visible: true, opacity: 1 },
{ id: "uncertainty", label: "Position uncertainty", visible: true, opacity: 0.65 },
{ id: "tracks", label: "Last-known tracks", visible: true, opacity: 0.8 },
{ id: "coverage", label: "Reported coverage", visible: true, opacity: 0.4 },
{ id: "site", label: "Local site plan", visible: true, opacity: 1 },
];
export const fixtureObservedAt = "2026-09-30T12:00:00Z";
const point = (x: number, y: number): GeoPoint => [-122.3 + x, 37.8 + y];
function rectangle(x: number, y: number, width: number, height: number): readonly GeoPoint[] {
return [
point(x, y),
point(x + width, y),
point(x + width, y + height),
point(x, y + height),
point(x, y),
];
}
const buildings: GeoSiteFeature[] = [
{
id: "pump-house",
label: "Pump house",
kind: "building",
points: rectangle(-0.0021, 0.00025, 0.0006, 0.0005),
},
{
id: "control-room",
label: "Control room",
kind: "building",
points: rectangle(-0.0009, -0.0008, 0.0006, 0.0004),
},
{
id: "workshop",
label: "Workshop",
kind: "building",
points: rectangle(0.0008, -0.00075, 0.001, 0.00045),
},
{
id: "power-house",
label: "Power house",
kind: "building",
points: rectangle(0.0011, 0.0008, 0.0008, 0.00045),
},
{
id: "stores",
label: "Stores",
kind: "building",
points: rectangle(-0.0008, 0.0007, 0.0008, 0.00035),
},
{
id: "treatment-a",
label: "Treatment A",
kind: "building",
points: rectangle(-0.002, -0.0012, 0.0006, 0.0006),
},
{
id: "treatment-b",
label: "Treatment B",
kind: "building",
points: rectangle(-0.002, -0.002, 0.0006, 0.0006),
},
{
id: "tank-a",
label: "Storage A",
kind: "building",
points: rectangle(0.0008, 0.00165, 0.0004, 0.0004),
},
{
id: "tank-b",
label: "Storage B",
kind: "building",
points: rectangle(0.0014, 0.00165, 0.0004, 0.0004),
},
];
export const utilitySite: readonly GeoSiteFeature[] = [
{
id: "site-boundary",
label: "Utility district",
kind: "boundary",
points: rectangle(-0.003, -0.0027, 0.006, 0.0055),
},
{
id: "water-channel",
label: "Water channel",
kind: "water",
points: [
point(-0.004, -0.004),
point(-0.0032, -0.004),
point(-0.0032, 0.004),
point(-0.004, 0.004),
point(-0.004, -0.004),
],
},
{
id: "service-road",
label: "Service road",
kind: "road",
points: [
point(-0.0025, -0.003),
point(-0.0011, -0.0023),
point(0.0001, -0.0018),
point(0.0001, 0.0017),
point(0.0026, 0.0026),
],
},
{
id: "west-access",
label: "West access",
kind: "road",
points: [point(-0.003, 0.00005), point(0.0001, 0.00005), point(0.0028, 0.00005)],
},
...buildings,
];
function equipment(
id: string,
name: string,
typeLabel: string,
position: GeoPoint | null,
condition: string,
variant: "success" | "warning" | "neutral",
detail: string,
): GeoEntity {
return {
record: {
id,
name,
typeLabel,
summary: detail,
condition: { label: condition, variant },
quality: {
state: position === null ? "unknown" : "current",
source: "Utility survey / local fixture",
updatedAt: Date.parse(fixtureObservedAt),
detail: "Supplied fictional observation; no live equipment connection.",
},
facts: [
{ id: "area", label: "Area", value: "Harbor utility district" },
{ id: "reference", label: "Reference", value: id, mono: true },
],
},
position,
positionState: position === null ? "unknown" : "reported",
observedAt: position === null ? null : fixtureObservedAt,
};
}
const vehicle: GeoEntity = {
...equipment(
"VEH-07",
"Service vehicle 07",
"Maintenance",
point(0.0021, -0.0017),
"Last-known normal",
"neutral",
"Position is retained from the last report; current movement is unknown.",
),
positionState: "last-known",
observedAt: "2026-09-30T11:42:00Z",
uncertaintyMeters: 65,
track: [
{ position: point(-0.0009, -0.0022), observedAt: "2026-09-30T11:36:00Z" },
{ position: point(0.0001, -0.0018), observedAt: "2026-09-30T11:38:00Z" },
{ position: point(0.0011, -0.00175), observedAt: "2026-09-30T11:40:00Z" },
{ position: point(0.0021, -0.0017), observedAt: "2026-09-30T11:42:00Z" },
],
};
vehicle.record = {
...vehicle.record,
quality: {
...vehicle.record.quality,
state: "stale",
updatedAt: vehicle.observedAt === null ? null : Date.parse(vehicle.observedAt),
detail: "Last report received at 11:42 UTC. Position uncertainty supplied as 65 m.",
},
};
export const utilityEntities: readonly GeoEntity[] = [
equipment(
"PUMP-01",
"Intake pump 01",
"Pump",
point(-0.0018, 0.0005),
"Ready for service",
"success",
"Duty pump operating normally. Intake valve shares the pump-house location.",
),
equipment(
"VALVE-01",
"Intake valve 01",
"Valve",
point(-0.0018, 0.0005),
"Inspection due",
"warning",
"Quarterly seal inspection due at 13:00 UTC. Pump operation remains available.",
),
equipment(
"SENSOR-11",
"Pressure sensor 11",
"Sensor",
point(0.00032, 0.0003),
"Nominal",
"success",
"Reported pressure 6.2 bar. Operating limits belong to the source application.",
),
equipment(
"SENSOR-12",
"Flow sensor 12",
"Sensor",
point(0.00038, 0.00033),
"Nominal",
"success",
"Reported flow 48 L/s. Nearby sensors remain individually selectable.",
),
equipment(
"POWER-02",
"Power house 02",
"Power",
point(0.0015, 0.00105),
"Nominal",
"success",
"Supplied equipment position within the eastern service block.",
),
{
...equipment(
"CAM-03",
"Perimeter camera 03",
"Camera",
point(-0.0007, -0.0006),
"Available",
"success",
"Reported observation footprint covers the southern service road.",
),
coverage: [
point(-0.0007, -0.0006),
point(-0.0027, -0.0017),
point(-0.0017, -0.0025),
point(0.0006, -0.0024),
point(-0.0007, -0.0006),
],
},
vehicle,
equipment(
"GAUGE-04",
"Portable gauge 04",
"Gauge",
null,
"Location unknown",
"neutral",
"Present in the supplied inventory without geographic coordinates.",
),
equipment(
"PUMP-REMOTE",
"Remote pump station",
"Pump",
point(0.027, 0.014),
"Inspection due",
"warning",
"Remote station east of the main facility. Seal inspection due at 13:00 UTC.",
),
];
export const utilitySnapshot: GeoSnapshot = {
title: "Harbor utilities · field operations",
id: "harbor-utility",
revision: "survey-1",
source: "Harbor utility district / exercise survey",
observedAt: fixtureObservedAt,
availability: "current",
entities: utilityEntities,
site: utilitySite,
};
patterns/facility-monitoring/types.ts
import type { TimelineEvent, TimeRangeValue } from "@operator-ds/react";
import type { GeoEntity, GeoPoint, GeoSiteFeature } from "../geospatial-workspace/types";
export interface FacilityReviewState {
mode: "live" | "review";
range: { start: number; end: number };
cursor: number;
playing: boolean;
playbackRate: number;
}
export interface FacilityRecording {
id: string;
/** Inclusive absolute start and exclusive absolute end, in milliseconds. */
start: number;
end: number;
src: string;
/** Position in the media at start, in seconds. */
mediaOffset: number;
}
export interface FacilityCamera {
id: string;
name: string;
equipmentId: string;
position: GeoPoint | null;
connection: "connected" | "reconnecting" | "unavailable";
latencyMs: number | null;
source: string;
recordings: readonly FacilityRecording[];
canControl: boolean;
controlReason?: string;
}
export interface FacilityEquipment {
id: string;
name: string;
history: readonly { at: number; entity: GeoEntity; pressure: number | null }[];
}
export interface FacilityEvent extends TimelineEvent {
equipmentId?: string;
cameraId?: string;
}
export interface FacilitySnapshot {
id: string;
title?: string;
source: string;
range: TimeRangeValue;
liveTime: number;
equipment: readonly FacilityEquipment[];
cameras: readonly FacilityCamera[];
events: readonly FacilityEvent[];
site: readonly GeoSiteFeature[];
}
export interface FacilityBookmark {
id: string;
name: string;
cursor: number;
cameraId: string | null;
equipmentId: string | null;
sourceKey: string;
}
export interface CameraCommandRequest {
cameraId: string;
command: "reset-view";
requestedAt: number;
}
export interface CameraCommandResult {
state: "accepted" | "rejected" | "failed" | "complete";
message: string;
requestId?: string;
}
export interface FacilityMonitoringProps {
snapshot: FacilitySnapshot;
review: FacilityReviewState;
onReviewChange: (review: FacilityReviewState) => void;
onCameraCommand?: (request: CameraCommandRequest) => Promise<CameraCommandResult>;
}
patterns/facility-monitoring/review-state.ts
import type { TimeRangeValue } from "@operator-ds/react";
import type { GeoEntity, GeoSnapshot } from "../geospatial-workspace/types";
import type {
FacilityCamera,
FacilityEquipment,
FacilityRecording,
FacilityReviewState,
FacilitySnapshot,
} from "./types";
export type FacilityReviewAction =
| { type: "seek"; time: number }
| { type: "play"; playing: boolean }
| { type: "rate"; rate: number }
| { type: "range"; range: TimeRangeValue }
| { type: "live" }
| { type: "tick"; elapsedMs: number };
export const facilityPlaybackRates = [0.5, 1, 2, 4] as const;
const validTime = (time: number) =>
Number.isFinite(time) && !Number.isNaN(new Date(time).getTime());
const validRange = ({ start, end }: TimeRangeValue) =>
validTime(start) && validTime(end) && start < end;
const supportedRate = (rate: number) => facilityPlaybackRates.some((value) => value === rate);
const clamp = (time: number, range: TimeRangeValue) =>
validTime(time) ? Math.min(range.end, Math.max(range.start, time)) : range.start;
/** Invalid review preferences fall back to the supplied recording bounds. */
function reviewRange(snapshot: FacilitySnapshot, range: TimeRangeValue): TimeRangeValue | null {
if (!validRange(snapshot.range)) return null;
if (!validRange(range)) return { ...snapshot.range };
const bounded = {
start: Math.max(snapshot.range.start, range.start),
end: Math.min(snapshot.range.end, range.end),
};
return validRange(bounded) ? bounded : { ...snapshot.range };
}
export function initialReview(snapshot: FacilitySnapshot): FacilityReviewState {
const range = validRange(snapshot.range) ? { ...snapshot.range } : { start: 0, end: 0 };
return {
mode: "live",
range,
cursor: clamp(snapshot.liveTime, range),
playing: false,
playbackRate: 1,
};
}
/** The caller owns liveTime. Review never reads a clock or advances that reference. */
export function reviewAt(snapshot: FacilitySnapshot, review: FacilityReviewState): number {
const range = reviewRange(snapshot, review.range);
if (!range) return Number.NaN;
return clamp(review.mode === "live" ? snapshot.liveTime : review.cursor, range);
}
export function transitionReview(
review: FacilityReviewState,
action: FacilityReviewAction,
snapshot: FacilitySnapshot,
): FacilityReviewState {
const range = reviewRange(snapshot, review.range);
if (!range) return { ...review, playing: false };
const cursor = reviewAt(snapshot, review);
switch (action.type) {
case "seek":
return validTime(action.time)
? { ...review, mode: "review", range, cursor: clamp(action.time, range), playing: false }
: review;
case "play":
return {
...review,
mode: action.playing ? "review" : review.mode,
range,
cursor,
playing: action.playing && cursor < range.end && supportedRate(review.playbackRate),
};
case "rate":
return supportedRate(action.rate) ? { ...review, playbackRate: action.rate } : review;
case "range": {
if (!validRange(action.range)) return review;
const nextRange = {
start: Math.max(snapshot.range.start, action.range.start),
end: Math.min(snapshot.range.end, action.range.end),
};
return validRange(nextRange)
? {
...review,
mode: "review",
range: nextRange,
cursor: clamp(cursor, nextRange),
playing: false,
}
: review;
}
case "live":
return {
...initialReview(snapshot),
playbackRate: supportedRate(review.playbackRate) ? review.playbackRate : 1,
};
case "tick": {
if (
review.mode !== "review" ||
!review.playing ||
!Number.isFinite(action.elapsedMs) ||
action.elapsedMs <= 0
)
return review;
if (!supportedRate(review.playbackRate)) return { ...review, playing: false };
// Compare remaining time first so a very large finite tick cannot overflow.
const remaining = range.end - cursor;
const atEnd = action.elapsedMs >= remaining / review.playbackRate;
return {
...review,
range,
cursor: atEnd ? range.end : cursor + action.elapsedMs * review.playbackRate,
playing: !atEnd,
};
}
}
}
/** Date.parse accepts rolled-over dates such as February 30; reject those. */
function observationTime(value: string): number {
const time = Date.parse(value);
const calendar = /^\d{4}-\d{2}-\d{2}T/.exec(value)?.[0].slice(0, 10);
if (!validTime(time) || !calendar) return Number.NaN;
const midnight = Date.parse(`${calendar}T00:00:00Z`);
return validTime(midnight) && new Date(midnight).toISOString().startsWith(calendar)
? time
: Number.NaN;
}
function availableFrame(frame: FacilityEquipment["history"][number], at: number): boolean {
if (!validTime(frame.at) || frame.at > at) return false;
const captured = frame.entity.observedAt;
if (captured !== null) {
const capturedAt = observationTime(captured);
if (!validTime(capturedAt) || capturedAt > at) return false;
}
const updated = frame.entity.record.quality.updatedAt;
return updated == null || (validTime(updated) && updated <= at);
}
function missingEntity(equipment: FacilityEquipment, source: string): GeoEntity {
return {
record: {
id: equipment.id,
name: equipment.name,
facts: [],
quality: {
state: "unavailable",
source,
updatedAt: null,
detail: "No equipment report is available at this review time.",
},
},
position: null,
positionState: "unknown",
observedAt: null,
};
}
export function resolveEquipment(snapshot: FacilitySnapshot, at: number): GeoSnapshot {
const ceiling =
validTime(at) && validRange(snapshot.range) ? Math.min(at, snapshot.range.end) : Number.NaN;
const evidence: (readonly [
string,
number | null,
number | null,
string | null,
string | null,
])[] = [];
let available = 0;
let latestObservation: number | null = null;
const entities = snapshot.equipment.map((equipment) => {
let frame: FacilityEquipment["history"][number] | undefined;
let frameIndex: number | null = null;
if (validTime(ceiling))
equipment.history.forEach((candidate, index) => {
// Last supplied frame wins ties, allowing a corrected observation.
if (availableFrame(candidate, ceiling) && (!frame || candidate.at >= frame.at)) {
frame = candidate;
frameIndex = index;
}
});
if (!frame) {
evidence.push([equipment.id, null, null, null, null]);
return missingEntity(equipment, snapshot.source);
}
available += 1;
const entity = frame.entity;
evidence.push([
equipment.id,
frame.at,
frameIndex,
entity.record.quality.source ?? null,
entity.observedAt,
]);
if (entity.observedAt !== null) {
const observed = observationTime(entity.observedAt);
if (latestObservation === null || observed > latestObservation) latestObservation = observed;
}
return {
...entity,
record: { ...entity.record, id: equipment.id },
...(entity.track
? {
track: entity.track.filter((point) => {
const observed = observationTime(point.observedAt);
return validTime(observed) && observed <= ceiling;
}),
}
: {}),
};
});
return {
id: snapshot.id,
// Stable while the evidence is unchanged; source replacement creates a new frame.
revision: JSON.stringify([snapshot.source, evidence]),
source: snapshot.source,
observedAt: latestObservation === null ? null : new Date(latestObservation).toISOString(),
availability:
available === 0
? "unavailable"
: entities.every((entity) => entity.record.quality.state === "current")
? "current"
: "partial",
detail: "Equipment reports at or before the shared review cursor.",
entities,
site: snapshot.site,
};
}
/** No nearest-recording fallback: a gap is unavailable footage. */
export function resolveRecording(
camera: FacilityCamera,
at: number,
): { recording: FacilityRecording; mediaTime: number } | null {
if (!validTime(at)) return null;
let recording: FacilityRecording | undefined;
for (const candidate of camera.recordings) {
if (
!validRange(candidate) ||
!candidate.src.trim() ||
!Number.isFinite(candidate.mediaOffset) ||
candidate.mediaOffset < 0
)
continue;
if (
candidate.start <= at &&
at < candidate.end &&
(!recording || candidate.start >= recording.start)
)
recording = candidate;
}
if (!recording) return null;
const mediaTime = recording.mediaOffset + (at - recording.start) / 1_000;
return Number.isFinite(mediaTime) ? { recording, mediaTime } : null;
}
patterns/facility-monitoring/synchronized-video.tsx
"use client";
import { forwardRef, useImperativeHandle, useLayoutEffect, useRef } from "react";
export type VideoFrameState = {
state: "loading" | "seeking" | "ready" | "waiting" | "ended" | "error";
mediaTime: number | null;
message?: string;
};
export type VideoCaptureHandle = {
capture: () => Promise<{ src: string; mediaTime: number }>;
};
export type SynchronizedVideoProps = {
src: string | null;
/** Requested position in seconds from the start of this recording. */
time: number;
playing: boolean;
playbackRate: number;
label: string;
onFrameChange: (frame: VideoFrameState) => void;
};
type VideoSession = {
applyControls: () => void;
capture: VideoCaptureHandle["capture"];
};
// This recipe's tolerance is an integration choice, not a core component default.
const synchronizationTolerance = 0.25;
const pausedSeekDeadlineMs = 5_000;
export const SynchronizedVideo = forwardRef<VideoCaptureHandle, SynchronizedVideoProps>(
({ src, time, playing, playbackRate, label, onFrameChange }, ref) => {
const videoRef = useRef<HTMLVideoElement>(null);
const sessionRef = useRef<VideoSession | null>(null);
const latest = useRef({ src, time, playing, playbackRate, onFrameChange });
latest.current = { src, time, playing, playbackRate, onFrameChange };
useImperativeHandle(
ref,
() => ({
capture: async () => {
if (!sessionRef.current)
throw new Error("No synchronized frame is available to capture.");
return sessionRef.current.capture();
},
}),
[],
);
useLayoutEffect(() => {
const video = videoRef.current;
if (!video) return;
let active = true;
let frame: VideoFrameState | null = null;
let confirmedTime: number | null = null;
let pendingSeek = false;
let waiting = false;
let failed = false;
let failureKind: "source" | "request" | "playback" = "source";
let lastPlaying = latest.current.playing;
let ended = false;
let playRequested = false;
let playAttempt = 0;
let seekDeadline: number | undefined;
let seekTarget: number | null = null;
let seekRetried = false;
const clearSeekDeadline = () => {
window.clearTimeout(seekDeadline);
seekDeadline = undefined;
};
const isCurrent = () => active && videoRef.current === video && latest.current.src === src;
const matchesSource = () =>
Boolean(src && video.currentSrc && video.currentSrc === video.src);
const drawable = () => video.readyState >= 2 && video.videoWidth > 0 && video.videoHeight > 0;
const synchronized = () =>
Number.isFinite(video.currentTime) &&
Math.abs(video.currentTime - latest.current.time) <= synchronizationTolerance;
const emit = (next: VideoFrameState) => {
if (!isCurrent()) return;
if (
frame?.state === next.state &&
frame.mediaTime === next.mediaTime &&
frame.message === next.message
)
return;
frame = next;
latest.current.onFrameChange(next);
};
const fail = (message: string, kind: typeof failureKind = "source") => {
clearSeekDeadline();
failed = true;
failureKind = kind;
playAttempt += 1;
playRequested = false;
video.pause();
emit({ state: "error", mediaTime: confirmedTime, message });
};
const armSeekDeadline = () => {
if (latest.current.playing || failed || seekDeadline !== undefined) return;
const target = latest.current.time;
seekDeadline = window.setTimeout(() => {
seekDeadline = undefined;
if (!isCurrent() || failed || latest.current.playing || latest.current.time !== target)
return;
if (!pendingSeek && !video.seeking && frame?.state === "ready") return;
if (seekRetried) {
fail("Recording seek did not complete. Reload media to try again.");
return;
}
// A native paused seek can stall without an error or a seeked event.
// Restart this decoder once; only fresh decoder observations can recover it.
seekRetried = true;
pendingSeek = false;
waiting = false;
ended = false;
confirmedTime = null;
playAttempt += 1;
playRequested = false;
emit({
state: "loading",
mediaTime: null,
message: "Recording seek stalled. Reloading the selected recording once.",
});
video.pause();
video.load();
armSeekDeadline();
}, pausedSeekDeadlineMs);
};
const playIfRequested = () => {
if (
!isCurrent() ||
!latest.current.playing ||
failed ||
pendingSeek ||
video.seeking ||
playRequested ||
video.readyState < 1
)
return;
playRequested = true;
const attempt = ++playAttempt;
try {
const promise = video.play();
// Older implementations can return undefined from play().
promise?.catch((error: unknown) => {
if (!isCurrent() || attempt !== playAttempt || !latest.current.playing) return;
fail(
`Playback failed: ${error instanceof Error ? error.message : "the browser rejected playback."}`,
"playback",
);
});
} catch (error) {
if (isCurrent() && attempt === playAttempt)
fail(
`Playback failed: ${error instanceof Error ? error.message : "the browser rejected playback."}`,
"playback",
);
}
};
const applyControls = () => {
if (!isCurrent()) return;
const request = latest.current;
if (request.time !== seekTarget || request.playing) {
clearSeekDeadline();
seekTarget = request.time;
// A target change must not abandon a decoder reload still awaiting metadata.
if (request.playing || video.readyState >= 1) seekRetried = false;
}
const retryPlayback = !lastPlaying && request.playing;
lastPlaying = request.playing;
if (!src) {
fail("No recording is available at this position.");
return;
}
if (!Number.isFinite(request.time) || request.time < 0) {
fail("Requested recording time is invalid.", "request");
return;
}
if (!Number.isFinite(request.playbackRate) || request.playbackRate <= 0) {
fail("Requested playback rate is invalid.", "request");
return;
}
if (!request.playing) {
playAttempt += 1;
playRequested = false;
video.pause();
}
try {
video.playbackRate = request.playbackRate;
} catch {
fail("The browser does not support the requested playback rate.", "request");
return;
}
if (video.readyState < 1) {
if (seekRetried) armSeekDeadline();
return;
}
if (!Number.isFinite(video.duration) || request.time > video.duration) {
fail("Requested position is outside the recording range.", "request");
return;
}
const reconfirmRequest = failed && failureKind === "request";
if (reconfirmRequest || (failed && failureKind === "playback" && retryPlayback)) {
failed = false;
}
if (failed) return;
if (reconfirmRequest || !synchronized()) {
pendingSeek = true;
ended = false;
emit({
state: "seeking",
mediaTime: confirmedTime,
message: "Waiting for the requested frame to decode.",
});
try {
video.currentTime = request.time;
armSeekDeadline();
} catch {
fail("The browser could not seek to the requested frame.", "request");
}
} else {
if (pendingSeek || video.seeking) armSeekDeadline();
playIfRequested();
}
};
// Only decoder observations confirm actual frame time. Setting currentTime
// is a request and does not establish that the displayed frame changed.
const confirmFrame = () => {
if (!isCurrent() || failed || ended || waiting || pendingSeek || video.seeking) return;
if (!drawable()) {
emit({
state: "loading",
mediaTime: confirmedTime,
message: "Waiting for a decoded frame.",
});
return;
}
if (!matchesSource()) {
fail("Decoded frame source does not match the selected recording.");
return;
}
if (!synchronized()) {
// Native playback can lead a host's sampled cursor between clock ticks.
// Only a control update requests a seek; decoder events never rewind it.
emit({
state: "seeking",
mediaTime: confirmedTime,
message: "Displayed frame is outside the requested position; awaiting synchronization.",
});
return;
}
clearSeekDeadline();
confirmedTime = video.currentTime;
emit({ state: "ready", mediaTime: confirmedTime });
playIfRequested();
};
const onMetadata = () => applyControls();
const onData = () => confirmFrame();
const onSeeking = () => {
if (!isCurrent() || failed) return;
pendingSeek = true;
emit({
state: "seeking",
mediaTime: confirmedTime,
message: "Waiting for the requested frame to decode.",
});
};
const onSeeked = () => {
if (!isCurrent() || failed) return;
pendingSeek = false;
waiting = false;
ended = false;
confirmFrame();
};
const onWaiting = () => {
if (!isCurrent() || failed) return;
waiting = true;
emit({
state: "waiting",
mediaTime: confirmedTime,
message: "Recording is buffering; the last confirmed frame may be retained.",
});
};
const onCanPlay = () => {
if (!isCurrent() || failed) return;
waiting = false;
playIfRequested();
};
const onEnded = () => {
if (!isCurrent() || failed) return;
clearSeekDeadline();
ended = true;
playRequested = false;
emit({ state: "ended", mediaTime: confirmedTime, message: "Recording ended." });
};
const onError = () => {
if (isCurrent()) fail(video.error?.message || "Recording could not be loaded or decoded.");
};
const listeners: [string, EventListener][] = [
["loadedmetadata", onMetadata],
["loadeddata", onData],
["seeking", onSeeking],
["seeked", onSeeked],
["timeupdate", confirmFrame],
["waiting", onWaiting],
["canplay", onCanPlay],
["playing", onCanPlay],
["ended", onEnded],
["error", onError],
];
for (const [event, listener] of listeners) video.addEventListener(event, listener);
const session: VideoSession = {
applyControls,
capture: async () => {
if (
!isCurrent() ||
frame?.state !== "ready" ||
failed ||
waiting ||
ended ||
pendingSeek ||
video.seeking ||
!matchesSource() ||
!drawable() ||
!synchronized()
) {
throw new Error(
"A decoded, synchronized frame is required to capture. Wait for seeking or buffering to finish.",
);
}
const canvas = document.createElement("canvas");
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
const context = canvas.getContext("2d");
if (!context) throw new Error("Canvas capture is unavailable in this browser.");
const mediaTime = video.currentTime;
context.drawImage(video, 0, 0, canvas.width, canvas.height);
const image = canvas.toDataURL("image/png");
if (!image.startsWith("data:image/png;base64,"))
throw new Error("The browser could not encode the captured frame as PNG.");
return { src: image, mediaTime };
},
};
sessionRef.current = session;
emit({ state: "loading", mediaTime: null, message: "Loading the selected recording." });
if (src) {
// Cleanup releases the decoder; StrictMode can then reuse the same node.
video.setAttribute("src", src);
video.load();
}
applyControls();
return () => {
active = false;
clearSeekDeadline();
playAttempt += 1;
for (const [event, listener] of listeners) video.removeEventListener(event, listener);
video.pause();
video.removeAttribute("src");
video.load();
if (sessionRef.current === session) sessionRef.current = null;
};
}, [src]);
useLayoutEffect(() => {
sessionRef.current?.applyControls();
}, [src, time, playing, playbackRate]);
return (
<video
key={src ?? "no-recording"}
ref={videoRef}
src={src ?? undefined}
muted
playsInline
preload="auto"
aria-label={label}
className="h-full w-full object-contain"
/>
);
},
);
SynchronizedVideo.displayName = "SynchronizedVideo";
patterns/facility-monitoring/demo.tsx
"use client";
import { useCallback, useEffect, useMemo, useState } from "react";
import { Checkbox, Field } from "@operator-ds/react";
import { FacilityMonitoring } from "./facility-monitoring";
import { createFacilitySnapshot } from "./fixtures";
import { initialReview, transitionReview } from "./review-state";
import type { CameraCommandResult } from "./types";
/**
* The training clip is a 459 KB base64 string. It is imported on demand, so it travels in its own
* chunk and no page that merely imports the demo carries it. `null` while it loads.
*/
function useTrainingMedia(): { media: string | null; failed: boolean } {
const [loaded, setLoaded] = useState<{ media: string | null; failed: boolean }>({
media: null,
failed: false,
});
useEffect(() => {
let live = true;
import("./training-media").then(
(module) => live && setLoaded({ media: module.facilityTrainingMedia, failed: false }),
() => live && setLoaded({ media: null, failed: true }),
);
return () => {
live = false;
};
}, []);
return loaded;
}
export function FacilityMonitoringDemo() {
const { media, failed } = useTrainingMedia();
const [rejectCommands, setRejectCommands] = useState(false);
return (
<div className="flex w-full min-w-0 flex-col gap-3u">
{media ? (
<TrainingConsole media={media} rejectCommands={rejectCommands} />
) : failed ? (
<p role="alert" className="m-0 text-oprt-error">
The training footage could not be loaded. Reload the page to try again.
</p>
) : (
<p role="status" className="m-0 text-oprt-text-dim">
Loading training footage…
</p>
)}
<details className="border-t border-oprt-border pt-2u text-oprt-text-dim">
<summary className="min-h-[var(--oprt-height-sm)] cursor-pointer py-1u text-oprt-base font-medium focus-visible:outline focus-visible:outline-2 focus-visible:outline-oprt-border-focus">
Simulation controls
</summary>
<div className="flex flex-col gap-2u">
<p className="m-0 text-oprt-base text-oprt-text-dim">
Training fixture · fixed source time 14:31 UTC. Generated silent still-scene footage;
equipment reports and camera responses are simulated.
</p>
<Field label="Reject camera requests">
<Checkbox
checked={rejectCommands}
onCheckedChange={(checked) => setRejectCommands(checked === true)}
/>
</Field>
</div>
</details>
</div>
);
}
function TrainingConsole({ media, rejectCommands }: { media: string; rejectCommands: boolean }) {
const snapshot = useMemo(() => createFacilitySnapshot(media), [media]);
const [review, setReview] = useState(() => initialReview(snapshot));
useEffect(() => {
if (review.mode !== "review" || !review.playing) return;
let previous = performance.now();
const interval = window.setInterval(() => {
const now = performance.now();
const elapsedMs = now - previous;
previous = now;
setReview((current) => transitionReview(current, { type: "tick", elapsedMs }, snapshot));
}, 250);
return () => window.clearInterval(interval);
}, [review.mode, review.playing, snapshot]);
// One function per setting: a new one on every 250 ms tick would read as a new camera service.
const onCameraCommand = useCallback(
async (): Promise<CameraCommandResult> =>
rejectCommands
? {
state: "rejected",
message: "Training service rejected the camera request. The view was not changed.",
}
: {
state: "accepted",
message:
"Training service accepted the camera request. Completion has not been reported.",
},
[rejectCommands],
);
return (
<FacilityMonitoring
snapshot={snapshot}
review={review}
onReviewChange={setReview}
onCameraCommand={onCameraCommand}
/>
);
}
patterns/facility-monitoring/training-media.ts
Generated media module (448 KB of embedded data). Copy it with the other files by running operator-ds add facility-monitoring, or read it in @operator-ds/manifest/manifest.json.