Function _firstCoordinate

src/mapml/handlers/QueryHandler.js:24–43

(json)

// Extract the first [x, y] coordinate pair from a GeoJSON object,
// drilling into FeatureCollection → Feature → Geometry → coordinates.
function _firstCoordinate(json) {
  if (!json) return null;
  let type = json.type && json.type.toUpperCase();
  if (type === 'FEATURECOLLECTION') {
    if (json.features && json.features.length > 0)
      return _firstCoordinate(json.features[0]);
  } else if (type === 'FEATURE') {
    return _firstCoordinate(json.geometry);
  } else if (json.coordinates) {
    // Unwrap nested arrays until we reach a [number, number] pair
    let coords = json.coordinates;
    while (Array.isArray(coords) && Array.isArray(coords[0])) {
      coords = coords[0];
    }
    if (coords.length >= 2 && typeof coords[0] === 'number') return coords;
  } else if (type === 'GEOMETRYCOLLECTION' && json.geometries) {
    if (json.geometries.length > 0) return _firstCoordinate(json.geometries[0]);
  }
  return null;
}

export var QueryHandler = Handler.extend({
  addHooks: function () {