io / proto-apollo-geojson
src/io/proto/apolloGeoJson.ts is a lightweight helper used by the "import preview / auto fitBounds" path. It walks every point in a raw Apollo Map (after lon/lat projection) and returns a WGS84 bounding box [[minX, minY], [maxX, maxY]].
Despite the filename, the file does not compile GeoJSON features today. Editor GeoJSON compilation lives in
src/core/geometry/compile.ts+apolloCompile/features.ts. This module exposes onlycomputeApolloMapBounds.
Exported symbol
export function computeApolloMapBounds(
map: RawApolloMap,
): [[number, number], [number, number]] | null;Source:
src/io/proto/apolloGeoJson.ts:1-158.
RawApolloMap is a private structural type covering exactly the shape needed for bbox computation. Each RawXxx carries only the fields the sweep visits.
Implementation
A simple min/max sweep over:
lane.central_curve+lane.left_boundary.curve+lane.right_boundary.curvecrosswalk.polygon,junction.polygon,clear_area.polygon,parking_space.polygonroad.section[*].boundary.outer_polygon.edge[*].curvesignal.boundary+signal.stop_line[*]stop_sign.stop_line[*]speed_bump.position[*]
Each point's x and y must be number to participate (defensive against malformed input). Returns null when no point qualifies; the caller skips map.fitBounds in that case.
Usage
import { computeApolloMapBounds } from '@/io/proto/apolloGeoJson';
const bounds = computeApolloMapBounds(lonLatMap as Parameters<typeof computeApolloMapBounds>[0]);
if (bounds) {
map.fitBounds(bounds, { padding: 64, duration: 600 });
}apolloIO.worker calls this at the end of runImport and emits the result as IMPORT_RESULT.bounds. The main thread stores it on apolloMapStore.bounds, which triggers viewport convergence.
See also
- Import / Parse Base Map — caller.
- Geo / Lane Geometry — feature compilation lives in
core/geometry/compile.ts, not here.
Contributors
kent