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
145 lines (144 loc) • 4.78 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var meta_1 = require("@turf/meta");
var helpers_1 = require("@turf/helpers");
var clone_1 = __importDefault(require("@turf/clone"));
/**
* Converts a WGS84 GeoJSON object into Mercator (EPSG:900913) projection
*
* @name toMercator
* @param {GeoJSON|Position} geojson WGS84 GeoJSON object
* @param {Object} [options] Optional parameters
* @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
* @returns {GeoJSON} Projected GeoJSON
* @example
* var pt = turf.point([-71,41]);
* var converted = turf.toMercator(pt);
*
* //addToMap
* var addToMap = [pt, converted];
*/
function toMercator(geojson, options) {
if (options === void 0) { options = {}; }
return convert(geojson, "mercator", options);
}
exports.toMercator = toMercator;
/**
* Converts a Mercator (EPSG:900913) GeoJSON object into WGS84 projection
*
* @name toWgs84
* @param {GeoJSON|Position} geojson Mercator GeoJSON object
* @param {Object} [options] Optional parameters
* @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
* @returns {GeoJSON} Projected GeoJSON
* @example
* var pt = turf.point([-7903683.846322424, 5012341.663847514]);
* var converted = turf.toWgs84(pt);
*
* //addToMap
* var addToMap = [pt, converted];
*/
function toWgs84(geojson, options) {
if (options === void 0) { options = {}; }
return convert(geojson, "wgs84", options);
}
exports.toWgs84 = toWgs84;
/**
* Converts a GeoJSON coordinates to the defined `projection`
*
* @private
* @param {GeoJSON} geojson GeoJSON Feature or Geometry
* @param {string} projection defines the projection system to convert the coordinates to
* @param {Object} [options] Optional parameters
* @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
* @returns {GeoJSON} Converted GeoJSON
*/
function convert(geojson, projection, options) {
if (options === void 0) { options = {}; }
// Optional parameters
options = options || {};
var mutate = options.mutate;
// Validation
if (!geojson)
throw new Error("geojson is required");
// Handle Position
if (Array.isArray(geojson) && helpers_1.isNumber(geojson[0]))
geojson =
projection === "mercator"
? convertToMercator(geojson)
: convertToWgs84(geojson);
// Handle GeoJSON
else {
// Handle possible data mutation
if (mutate !== true)
geojson = clone_1.default(geojson);
meta_1.coordEach(geojson, function (coord) {
var newCoord = projection === "mercator"
? convertToMercator(coord)
: convertToWgs84(coord);
coord[0] = newCoord[0];
coord[1] = newCoord[1];
});
}
return geojson;
}
/**
* Convert lon/lat values to 900913 x/y.
* (from https://github.com/mapbox/sphericalmercator)
*
* @private
* @param {Array<number>} lonLat WGS84 point
* @returns {Array<number>} Mercator [x, y] point
*/
function convertToMercator(lonLat) {
var D2R = Math.PI / 180,
// 900913 properties
A = 6378137.0, MAXEXTENT = 20037508.342789244;
// compensate longitudes passing the 180th meridian
// from https://github.com/proj4js/proj4js/blob/master/lib/common/adjust_lon.js
var adjusted = Math.abs(lonLat[0]) <= 180 ? lonLat[0] : lonLat[0] - sign(lonLat[0]) * 360;
var xy = [
A * adjusted * D2R,
A * Math.log(Math.tan(Math.PI * 0.25 + 0.5 * lonLat[1] * D2R)),
];
// if xy value is beyond maxextent (e.g. poles), return maxextent
if (xy[0] > MAXEXTENT)
xy[0] = MAXEXTENT;
if (xy[0] < -MAXEXTENT)
xy[0] = -MAXEXTENT;
if (xy[1] > MAXEXTENT)
xy[1] = MAXEXTENT;
if (xy[1] < -MAXEXTENT)
xy[1] = -MAXEXTENT;
return xy;
}
/**
* Convert 900913 x/y values to lon/lat.
* (from https://github.com/mapbox/sphericalmercator)
*
* @private
* @param {Array<number>} xy Mercator [x, y] point
* @returns {Array<number>} WGS84 [lon, lat] point
*/
function convertToWgs84(xy) {
// 900913 properties.
var R2D = 180 / Math.PI;
var A = 6378137.0;
return [
(xy[0] * R2D) / A,
(Math.PI * 0.5 - 2.0 * Math.atan(Math.exp(-xy[1] / A))) * R2D,
];
}
/**
* Returns the sign of the input, or zero
*
* @private
* @param {number} x input
* @returns {number} -1|0|1 output
*/
function sign(x) {
return x < 0 ? -1 : x > 0 ? 1 : 0;
}