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
55 lines (52 loc) • 1.9 kB
JavaScript
;Object.defineProperty(exports, "__esModule", {value: true});// index.ts
var _meta = require('@turf/meta');
var _helpers = require('@turf/helpers');
var _clone = require('@turf/clone');
function toMercator(geojson, options = {}) {
return convert(geojson, "mercator", options);
}
function toWgs84(geojson, options = {}) {
return convert(geojson, "wgs84", options);
}
function convert(geojson, projection, options = {}) {
options = options || {};
var mutate = options.mutate;
if (!geojson) throw new Error("geojson is required");
if (Array.isArray(geojson) && _helpers.isNumber.call(void 0, geojson[0]))
geojson = projection === "mercator" ? convertToMercator(geojson) : convertToWgs84(geojson);
else {
if (mutate !== true) geojson = _clone.clone.call(void 0, geojson);
_meta.coordEach.call(void 0, geojson, function(coord) {
var newCoord = projection === "mercator" ? convertToMercator(coord) : convertToWgs84(coord);
coord[0] = newCoord[0];
coord[1] = newCoord[1];
});
}
return geojson;
}
function convertToMercator(lonLat) {
var D2R = Math.PI / 180, A = 6378137, MAXEXTENT = 20037508342789244e-9;
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[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;
}
function convertToWgs84(xy) {
var R2D = 180 / Math.PI;
var A = 6378137;
return [
xy[0] * R2D / A,
(Math.PI * 0.5 - 2 * Math.atan(Math.exp(-xy[1] / A))) * R2D
];
}
function sign(x) {
return x < 0 ? -1 : x > 0 ? 1 : 0;
}
exports.toMercator = toMercator; exports.toWgs84 = toWgs84;
//# sourceMappingURL=index.cjs.map