node-red-contrib-tak-registration/node_modules/topojson-server/src/geometry.js

A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK

// Given a hash of GeoJSON objects, returns a hash of GeoJSON geometry objects.
// Any null input geometry objects are represented as {type: null} in the output.
// Any feature.{id,properties,bbox} are transferred to the output geometry object.
// Each output geometry object is a shallow copy of the input (e.g., properties, coordinates)!
export default function(inputs) {
  var outputs = {}, key;
  for (key in inputs) outputs[key] = geomifyObject(inputs[key]);
  return outputs;
}

function geomifyObject(input) {
  return input == null ? {type: null}
      : (input.type === "FeatureCollection" ? geomifyFeatureCollection
      : input.type === "Feature" ? geomifyFeature
      : geomifyGeometry)(input);
}

function geomifyFeatureCollection(input) {
  var output = {type: "GeometryCollection", geometries: input.features.map(geomifyFeature)};
  if (input.bbox != null) output.bbox = input.bbox;
  return output;
}

function geomifyFeature(input) {
  var output = geomifyGeometry(input.geometry), key; // eslint-disable-line no-unused-vars
  if (input.id != null) output.id = input.id;
  if (input.bbox != null) output.bbox = input.bbox;
  for (key in input.properties) { output.properties = input.properties; break; }
  return output;
}

function geomifyGeometry(input) {
  if (input == null) return {type: null};
  var output = input.type === "GeometryCollection" ? {type: "GeometryCollection", geometries: input.geometries.map(geomifyGeometry)}
      : input.type === "Point" || input.type === "MultiPoint" ? {type: input.type, coordinates: input.coordinates}
      : {type: input.type, arcs: input.coordinates}; // TODO Check for unknown types?
  if (input.bbox != null) output.bbox = input.bbox;
  return output;
}