node-red-contrib-tak-registration
Version:
A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK
79 lines (78 loc) • 2.96 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var meta_1 = require("@turf/meta");
/**
* Takes a GeoJSON Feature or FeatureCollection and truncates the precision of the geometry.
*
* @name truncate
* @param {GeoJSON} geojson any GeoJSON Feature, FeatureCollection, Geometry or GeometryCollection.
* @param {Object} [options={}] Optional parameters
* @param {number} [options.precision=6] coordinate decimal precision
* @param {number} [options.coordinates=3] maximum number of coordinates (primarly used to remove z coordinates)
* @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
* @returns {GeoJSON} layer with truncated geometry
* @example
* var point = turf.point([
* 70.46923055566859,
* 58.11088890802906,
* 1508
* ]);
* var options = {precision: 3, coordinates: 2};
* var truncated = turf.truncate(point, options);
* //=truncated.geometry.coordinates => [70.469, 58.111]
*
* //addToMap
* var addToMap = [truncated];
*/
function truncate(geojson, options) {
if (options === void 0) { options = {}; }
// Optional parameters
var precision = options.precision;
var coordinates = options.coordinates;
var mutate = options.mutate;
// default params
precision =
precision === undefined || precision === null || isNaN(precision)
? 6
: precision;
coordinates =
coordinates === undefined || coordinates === null || isNaN(coordinates)
? 3
: coordinates;
// validation
if (!geojson)
throw new Error("<geojson> is required");
if (typeof precision !== "number")
throw new Error("<precision> must be a number");
if (typeof coordinates !== "number")
throw new Error("<coordinates> must be a number");
// prevent input mutation
if (mutate === false || mutate === undefined)
geojson = JSON.parse(JSON.stringify(geojson));
var factor = Math.pow(10, precision);
// Truncate Coordinates
meta_1.coordEach(geojson, function (coords) {
truncateCoords(coords, factor, coordinates);
});
return geojson;
}
/**
* Truncate Coordinates - Mutates coordinates in place
*
* @private
* @param {Array<any>} coords Geometry Coordinates
* @param {number} factor rounding factor for coordinate decimal precision
* @param {number} coordinates maximum number of coordinates (primarly used to remove z coordinates)
* @returns {Array<any>} mutated coordinates
*/
function truncateCoords(coords, factor, coordinates) {
// Remove extra coordinates (usually elevation coordinates and more)
if (coords.length > coordinates)
coords.splice(coordinates, coords.length);
// Truncate coordinate decimals
for (var i = 0; i < coords.length; i++) {
coords[i] = Math.round(coords[i] * factor) / factor;
}
return coords;
}
exports.default = truncate;