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| 1 | +// Geographic Sankey of CBD-bound flows from all NYMTC sectors (NJ, Queens, |
| 2 | +// Brooklyn, Staten Island, 60th-Street boundary). MVP: one ribbon per |
| 3 | +// (sector, mode) routed through representative entry paths defined in |
| 4 | +// `lib/nyc-paths.ts`. See `specs/nyc-flow-map.md` for the bigger picture |
| 5 | +// (subway-line detail, ferry network, drilldowns) — deferred for v2. |
| 6 | + |
| 7 | +import { useEffect, useMemo, useRef, useState } from 'react' |
| 8 | +import MapGL, { Source, Layer, Marker } from 'react-map-gl/maplibre' |
| 9 | +import type { MapRef } from 'react-map-gl/maplibre' |
| 10 | +import { SECTOR_LABELS } from '../lib/nyc-types' |
| 11 | +import 'maplibre-gl/dist/maplibre-gl.css' |
| 12 | +import { useUrlState, codeParam } from 'use-prms' |
| 13 | +import { pxToHalfDeg, ribbonArrow, flowFillPaint } from 'geo-sankey' |
| 14 | +import type { LatLon } from 'geo-sankey' |
| 15 | +import type { CrossingRecord, Direction, TimePeriod } from '../lib/types' |
| 16 | +import { type AppendixIIIRecord, type NycMode, type Sector, NYC_MODE_ORDER } from '../lib/nyc-types' |
| 17 | +import { buildNycRecords } from '../lib/nyc-data' |
| 18 | +import { ENTRY_PATHS, SECTOR_MODE_PATHS } from '../lib/nyc-paths' |
| 19 | +import { DEFAULT_SCHEME } from '../lib/colors' |
| 20 | +import Toggle, { type ToggleOption } from './Toggle' |
| 21 | + |
| 22 | +const REF_LAT = 40.74 |
| 23 | +const ARROW_WING = 1.6 |
| 24 | +const ARROW_LEN = 0.6 |
| 25 | + |
| 26 | +const MODE_COLORS: Record<NycMode, string> = { |
| 27 | + Auto: DEFAULT_SCHEME.mode.Autos, |
| 28 | + Bus: DEFAULT_SCHEME.mode.Bus, |
| 29 | + Subway: DEFAULT_SCHEME.mode.PATH, |
| 30 | + Rail: DEFAULT_SCHEME.mode.Rail, |
| 31 | + Ferry: DEFAULT_SCHEME.mode.Ferries, |
| 32 | +} |
| 33 | + |
| 34 | +// Per-sector label placement: anchors fan labels outward from Manhattan so |
| 35 | +// they don't pile up at the cluster of Lower-Manhattan arrow tips. |
| 36 | +const SECTOR_ANCHORS: Record<Sector, { anchor: 'left' | 'right' | 'top' | 'bottom'; offset: [number, number] }> = { |
| 37 | + nj: { anchor: 'right', offset: [-10, 0] }, // label sits W of NJ Manhattan portals (over Hudson) |
| 38 | + queens: { anchor: 'left', offset: [10, 0] }, // E (toward Queens) |
| 39 | + brooklyn: { anchor: 'left', offset: [10, 8] }, // E + small S, away from MB/BB tips |
| 40 | + '60th_street': { anchor: 'bottom', offset: [0, -8] }, // pushed N into uptown |
| 41 | + staten_island: { anchor: 'top', offset: [0, 8] }, // pushed S toward the harbor |
| 42 | + roosevelt_island: { anchor: 'top', offset: [0, 8] }, |
| 43 | +} |
| 44 | + |
| 45 | +// Map view encompasses all entry points: NJ shore on the W, LIC / Queens on |
| 46 | +// the NE, the four Brooklyn-side bridges/tunnels on the S, SI ferry to the |
| 47 | +// SW, and 60th St inflows along the top of the Manhattan grid. |
| 48 | +function defaultView(): { lat: number; lng: number; zoom: number } { |
| 49 | + const W = typeof window !== 'undefined' ? window.innerWidth : 1400 |
| 50 | + // Centered over Manhattan to fit NJ ↔ Queens horizontally and 60th St ↔ |
| 51 | + // Lower Manhattan vertically. SI Ferry is visible but its St-George end |
| 52 | + // intentionally extends out the bottom — the trace direction reads. |
| 53 | + if (W <= 768) return { lat: 40.730, lng: -73.985, zoom: 11.0 } |
| 54 | + return { lat: 40.730, lng: -73.985, zoom: 11.85 } |
| 55 | +} |
| 56 | + |
| 57 | +const dirParam = codeParam<Direction>('entering', [ |
| 58 | + ['entering', 'njny'], ['leaving', 'nynj'], |
| 59 | +]) |
| 60 | +const timeParam = codeParam<TimePeriod>('peak_1hr', [ |
| 61 | + ['peak_1hr', '1h'], ['peak_period', '3h'], ['24hr', '1d'], |
| 62 | +]) |
| 63 | +const DIR_OPTIONS: ToggleOption<Direction>[] = [ |
| 64 | + { value: 'entering', label: 'Entering', tooltip: 'Entering CBD' }, |
| 65 | + { value: 'leaving', label: 'Leaving', tooltip: 'Leaving CBD' }, |
| 66 | +] |
| 67 | +const TIME_OPTIONS: ToggleOption<TimePeriod>[] = [ |
| 68 | + { value: 'peak_1hr', label: '1hr' }, |
| 69 | + { value: 'peak_period', label: '3hr' }, |
| 70 | + { value: '24hr', label: 'day' }, |
| 71 | +] |
| 72 | + |
| 73 | +type Props = { |
| 74 | + appendixIii: AppendixIIIRecord[] |
| 75 | + vehicles: CrossingRecord[] |
| 76 | +} |
| 77 | + |
| 78 | +export default function NycFlowMap({ appendixIii, vehicles }: Props) { |
| 79 | + const [direction, setDirection] = useUrlState('d', dirParam) |
| 80 | + const [timePeriod, setTimePeriod] = useUrlState('t', timeParam) |
| 81 | + |
| 82 | + const mapRef = useRef<MapRef>(null) |
| 83 | + // `useState(defaultView)` evaluated the initializer twice under strict |
| 84 | + // mode and was producing two different objects (different `window` reads), |
| 85 | + // which left MapGL in a never-loaded state. Compute once at mount. |
| 86 | + const initialView = useMemo(defaultView, []) |
| 87 | + const [mapView, setMapView] = useState(initialView) |
| 88 | + const [hoveredKey, setHoveredKey] = useState<string | null>(null) |
| 89 | + |
| 90 | + const records = useMemo(() => buildNycRecords(appendixIii, vehicles), [appendixIii, vehicles]) |
| 91 | + |
| 92 | + // Maplibre sometimes captures the container's size before layout settles |
| 93 | + // (strict-mode double mount + the tall page above) and ends up stuck on |
| 94 | + // a black canvas because basemap tiles never start loading. Drive |
| 95 | + // `resize` + `triggerRepaint` from a ResizeObserver AND poll a few times |
| 96 | + // until the carto basemap source reports loaded. |
| 97 | + const containerRef = useRef<HTMLDivElement>(null) |
| 98 | + useEffect(() => { |
| 99 | + let cancelled = false |
| 100 | + const kick = () => { |
| 101 | + const m = mapRef.current?.getMap() |
| 102 | + if (!m) return |
| 103 | + m.resize() |
| 104 | + m.triggerRepaint() |
| 105 | + } |
| 106 | + const el = containerRef.current |
| 107 | + let ro: ResizeObserver | null = null |
| 108 | + if (el && typeof ResizeObserver !== 'undefined') { |
| 109 | + ro = new ResizeObserver(kick) |
| 110 | + ro.observe(el) |
| 111 | + } |
| 112 | + // Belt-and-suspenders: poll every 200 ms until carto source is loaded. |
| 113 | + const poll = () => { |
| 114 | + if (cancelled) return |
| 115 | + kick() |
| 116 | + const m = mapRef.current?.getMap() |
| 117 | + if (m && m.isSourceLoaded?.('carto')) return |
| 118 | + setTimeout(poll, 200) |
| 119 | + } |
| 120 | + setTimeout(poll, 50) |
| 121 | + return () => { cancelled = true; ro?.disconnect() } |
| 122 | + }, []) |
| 123 | + |
| 124 | + // Active = latest year × current direction × current time period. |
| 125 | + const flows = useMemo(() => { |
| 126 | + const yearSet = new Set(records.map(r => r.year)) |
| 127 | + const latestYear = Math.max(...yearSet) |
| 128 | + return records |
| 129 | + .filter(r => r.year === latestYear && r.direction === direction && r.time_period === timePeriod) |
| 130 | + .filter(r => r.persons > 0) |
| 131 | + }, [records, direction, timePeriod]) |
| 132 | + |
| 133 | + // For width-scaling: maxPersons = the largest (sector, mode) cell. |
| 134 | + const maxPersons = useMemo(() => { |
| 135 | + let m = 0 |
| 136 | + for (const f of flows) m = Math.max(m, f.persons) |
| 137 | + return m |
| 138 | + }, [flows]) |
| 139 | + |
| 140 | + const geojson = useMemo(() => { |
| 141 | + const features: GeoJSON.Feature[] = [] |
| 142 | + const zoom = mapView.zoom |
| 143 | + |
| 144 | + for (const f of flows) { |
| 145 | + const key = `${f.sector}|${f.mode}` as const |
| 146 | + const paths = SECTOR_MODE_PATHS[key] |
| 147 | + if (!paths || paths.length === 0) continue |
| 148 | + const color = MODE_COLORS[f.mode] |
| 149 | + // Width sized in pixels so all sectors share the same scale at any zoom. |
| 150 | + // Split the flow's persons evenly across all paths assigned to this |
| 151 | + // (sector, mode); the rough share isn't accurate but reads cleanly. |
| 152 | + const totalWidthPx = (f.persons / maxPersons) * 60 |
| 153 | + const perPathPx = Math.max(2, totalWidthPx / paths.length) |
| 154 | + |
| 155 | + for (const entryId of paths) { |
| 156 | + let path: LatLon[] = ENTRY_PATHS[entryId] |
| 157 | + if (direction === 'leaving') path = [...path].reverse() |
| 158 | + const halfW = pxToHalfDeg(perPathPx, zoom, 1, REF_LAT) |
| 159 | + const ring = ribbonArrow(path, halfW, REF_LAT, { |
| 160 | + arrowWingFactor: ARROW_WING, |
| 161 | + arrowLenFactor: ARROW_LEN, |
| 162 | + widthPx: perPathPx, |
| 163 | + }) |
| 164 | + if (!ring.length) continue |
| 165 | + features.push({ |
| 166 | + type: 'Feature', |
| 167 | + properties: { |
| 168 | + color, |
| 169 | + width: perPathPx, |
| 170 | + key: `${key}|${entryId}`, |
| 171 | + sectorMode: key, |
| 172 | + entryId, |
| 173 | + persons: f.persons, |
| 174 | + }, |
| 175 | + geometry: { |
| 176 | + type: 'Polygon', |
| 177 | + coordinates: [ring.map(([lon, lat]) => [lon, lat])], |
| 178 | + }, |
| 179 | + }) |
| 180 | + } |
| 181 | + } |
| 182 | + // Sort widest-first so smaller flows draw on top |
| 183 | + features.sort((a, b) => (b.properties?.width ?? 0) - (a.properties?.width ?? 0)) |
| 184 | + return { type: 'FeatureCollection' as const, features } |
| 185 | + }, [flows, maxPersons, mapView.zoom, direction]) |
| 186 | + |
| 187 | + // One label per sector at the arrow tip of that sector's largest mode. |
| 188 | + // Avoids cluttering the map with up to 5 labels per sector. |
| 189 | + const sectorLabels = useMemo(() => { |
| 190 | + type Item = { sector: Sector; pos: LatLon; persons: number; topMode: NycMode; topModePersons: number } |
| 191 | + const bySector = new Map<Sector, Item>() |
| 192 | + for (const f of flows) { |
| 193 | + const key = `${f.sector}|${f.mode}` as const |
| 194 | + const paths = SECTOR_MODE_PATHS[key] |
| 195 | + if (!paths || paths.length === 0) continue |
| 196 | + const path = ENTRY_PATHS[paths[0]] |
| 197 | + const tip = direction === 'leaving' ? path[0] : path[path.length - 1] |
| 198 | + const existing = bySector.get(f.sector) |
| 199 | + if (!existing) { |
| 200 | + bySector.set(f.sector, { |
| 201 | + sector: f.sector, pos: tip, persons: f.persons, |
| 202 | + topMode: f.mode, topModePersons: f.persons, |
| 203 | + }) |
| 204 | + } else { |
| 205 | + existing.persons += f.persons |
| 206 | + if (f.persons > existing.topModePersons) { |
| 207 | + existing.pos = tip |
| 208 | + existing.topMode = f.mode |
| 209 | + existing.topModePersons = f.persons |
| 210 | + } |
| 211 | + } |
| 212 | + } |
| 213 | + return [...bySector.values()] |
| 214 | + }, [flows, direction]) |
| 215 | + |
| 216 | + const dirLabel = direction === 'entering' ? 'Entering CBD' : 'Leaving CBD' |
| 217 | + const timeLabel = timePeriod === 'peak_1hr' ? (direction === 'entering' ? '8-9am' : '5-6pm') : |
| 218 | + timePeriod === 'peak_period' ? (direction === 'entering' ? '7-10am' : '4-7pm') : '24hr' |
| 219 | + const totalPersons = flows.reduce((s, f) => s + f.persons, 0) |
| 220 | + |
| 221 | + return ( |
| 222 | + <div className="geo-sankey"> |
| 223 | + <h2>NYC-wide CBD flows</h2> |
| 224 | + <p className="chart-subtitle">{dirLabel}, {timeLabel}, {Math.round(totalPersons / 1000)}k total · 2024</p> |
| 225 | + <div ref={containerRef} style={{ width: '100%', height: 820, position: 'relative', borderRadius: 8, overflow: 'hidden' }}> |
| 226 | + <MapGL |
| 227 | + ref={mapRef} |
| 228 | + mapStyle="https://basemaps.cartocdn.com/gl/dark-matter-gl-style/style.json" |
| 229 | + style={{ width: '100%', height: '100%' }} |
| 230 | + longitude={mapView.lng} |
| 231 | + latitude={mapView.lat} |
| 232 | + zoom={mapView.zoom} |
| 233 | + onMove={e => setMapView({ lat: e.viewState.latitude, lng: e.viewState.longitude, zoom: e.viewState.zoom })} |
| 234 | + onLoad={() => mapRef.current?.getMap()?.scrollZoom.disable()} |
| 235 | + interactiveLayerIds={['flow-fills']} |
| 236 | + onMouseMove={e => { |
| 237 | + const f = e.features?.[0] |
| 238 | + setHoveredKey((f?.properties?.sectorMode as string) ?? null) |
| 239 | + }} |
| 240 | + onMouseLeave={() => setHoveredKey(null)} |
| 241 | + > |
| 242 | + <Source id="flows" type="geojson" data={geojson}> |
| 243 | + <Layer |
| 244 | + id="flow-fills" |
| 245 | + type="fill" |
| 246 | + paint={flowFillPaint({ |
| 247 | + 'fill-opacity': hoveredKey |
| 248 | + ? ['case', ['==', ['get', 'sectorMode'], hoveredKey], 0.95, 0.18] |
| 249 | + : 0.82, |
| 250 | + }) as any} |
| 251 | + /> |
| 252 | + </Source> |
| 253 | + {/* One inline label per sector at the largest-mode arrow tip. |
| 254 | + Anchor placement is hand-tuned per sector so labels don't pile |
| 255 | + up at the Manhattan core. */} |
| 256 | + {sectorLabels.map(s => { |
| 257 | + const a = SECTOR_ANCHORS[s.sector] |
| 258 | + return ( |
| 259 | + <Marker |
| 260 | + key={s.sector} |
| 261 | + longitude={s.pos[1]} |
| 262 | + latitude={s.pos[0]} |
| 263 | + anchor={a.anchor} |
| 264 | + offset={a.offset} |
| 265 | + style={{ pointerEvents: 'none' }} |
| 266 | + > |
| 267 | + <div |
| 268 | + style={{ |
| 269 | + background: 'rgba(0,0,0,0.82)', color: '#eee', |
| 270 | + padding: '3px 8px', borderRadius: 4, fontSize: 12, |
| 271 | + whiteSpace: 'nowrap', borderLeft: `3px solid ${MODE_COLORS[s.topMode]}`, |
| 272 | + }} |
| 273 | + > |
| 274 | + <strong>{SECTOR_LABELS[s.sector]}</strong>{' '} |
| 275 | + <span style={{ opacity: 0.85 }}>{(s.persons / 1000).toFixed(0)}k</span> |
| 276 | + </div> |
| 277 | + </Marker> |
| 278 | + ) |
| 279 | + })} |
| 280 | + </MapGL> |
| 281 | + {/* Floating tooltip when a flow is hovered */} |
| 282 | + {hoveredKey && (() => { |
| 283 | + const f = flows.find(x => `${x.sector}|${x.mode}` === hoveredKey) |
| 284 | + if (!f) return null |
| 285 | + const sectorPretty = ({ |
| 286 | + nj: 'NJ', queens: 'Queens', brooklyn: 'Brooklyn', |
| 287 | + '60th_street': '60th St', staten_island: 'Staten Island', roosevelt_island: 'Roosevelt Is.', |
| 288 | + } as Record<string, string>)[f.sector] ?? f.sector |
| 289 | + return ( |
| 290 | + <div style={{ |
| 291 | + position: 'absolute', top: 10, left: 10, padding: '6px 10px', |
| 292 | + background: 'rgba(0,0,0,0.78)', color: '#eee', borderRadius: 4, fontSize: 13, |
| 293 | + pointerEvents: 'none', |
| 294 | + }}> |
| 295 | + <strong>{sectorPretty} · {f.mode}</strong>: {f.persons.toLocaleString()} persons |
| 296 | + </div> |
| 297 | + ) |
| 298 | + })()} |
| 299 | + </div> |
| 300 | + <div style={{ display: 'flex', flexWrap: 'wrap', gap: 8, justifyContent: 'center', alignItems: 'center', marginTop: 8 }}> |
| 301 | + <Toggle options={DIR_OPTIONS} value={direction} onChange={setDirection} /> |
| 302 | + <Toggle options={TIME_OPTIONS} value={timePeriod} onChange={setTimePeriod} /> |
| 303 | + <span style={{ fontSize: '0.85rem', color: 'var(--text-muted)' }}> |
| 304 | + {NYC_MODE_ORDER.map(m => ( |
| 305 | + <span key={m} style={{ marginRight: 12 }}> |
| 306 | + <span style={{ |
| 307 | + display: 'inline-block', width: 10, height: 10, borderRadius: 2, |
| 308 | + background: MODE_COLORS[m], marginRight: 4, verticalAlign: 'middle', |
| 309 | + }} /> |
| 310 | + {m} |
| 311 | + </span> |
| 312 | + ))} |
| 313 | + </span> |
| 314 | + </div> |
| 315 | + </div> |
| 316 | + ) |
| 317 | +} |
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