Madison Grubb
aa8a0bd83f
Ingest aircraft and vessel tracks via OSINT feeds and tactical CoT, expose viewport-filtered SSE to the map, and add an OSM ALPR layer with tiled caching and performant marker sync.
38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
const SYNC_KEY = '_kestrelMarkerSync'
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const pointFeatures = (features, keyFor) => (features ?? [])
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.filter(f => f?.geometry?.type === 'Point')
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.map(f => ({ feature: f, key: keyFor(f) }))
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.filter(({ key }) => key != null)
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export function syncFeatureMarkers(layer, features, { keyFor, create, update }) {
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const prev = layer[SYNC_KEY] ?? new Map()
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const next = pointFeatures(features, keyFor).reduce((map, { feature, key }) => {
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const existing = prev.get(key)
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if (existing) {
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update(existing, feature)
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return new Map([...map, [key, existing]])
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}
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const marker = create(feature)
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layer.addLayer(marker)
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return new Map([...map, [key, marker]])
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}, new Map())
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Array.from(prev.entries())
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.filter(([key]) => !next.has(key))
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.forEach(([, marker]) => layer.removeLayer(marker))
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layer[SYNC_KEY] = next
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}
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export function clearFeatureMarkers(layer) {
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if (!layer) return
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const prev = layer[SYNC_KEY]
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if (prev) {
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Array.from(prev.values()).forEach(marker => layer.removeLayer(marker))
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layer[SYNC_KEY] = new Map()
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return
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}
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layer.clearLayers()
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}
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