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
58 lines (55 loc) • 2.09 kB
JavaScript
;Object.defineProperty(exports, "__esModule", {value: true});// index.ts
var _convex = require('@turf/convex');
var _centroid = require('@turf/centroid');
var _helpers = require('@turf/helpers');
var _invariant = require('@turf/invariant');
var _meta = require('@turf/meta');
function centerOfMass(geojson, options = {}) {
switch (_invariant.getType.call(void 0, geojson)) {
case "Point":
return _helpers.point.call(void 0, _invariant.getCoord.call(void 0, geojson), options.properties);
case "Polygon":
var coords = [];
_meta.coordEach.call(void 0, geojson, function(coord) {
coords.push(coord);
});
var centre = _centroid.centroid.call(void 0, geojson, { properties: options.properties });
var translation = centre.geometry.coordinates;
var sx = 0;
var sy = 0;
var sArea = 0;
var i, pi, pj, xi, xj, yi, yj, a;
var neutralizedPoints = coords.map(function(point2) {
return [point2[0] - translation[0], point2[1] - translation[1]];
});
for (i = 0; i < coords.length - 1; i++) {
pi = neutralizedPoints[i];
xi = pi[0];
yi = pi[1];
pj = neutralizedPoints[i + 1];
xj = pj[0];
yj = pj[1];
a = xi * yj - xj * yi;
sArea += a;
sx += (xi + xj) * a;
sy += (yi + yj) * a;
}
if (sArea === 0) {
return centre;
} else {
var area = sArea * 0.5;
var areaFactor = 1 / (6 * area);
return _helpers.point.call(void 0,
[translation[0] + areaFactor * sx, translation[1] + areaFactor * sy],
options.properties
);
}
default:
var hull = _convex.convex.call(void 0, geojson);
if (hull) return centerOfMass(hull, { properties: options.properties });
else return _centroid.centroid.call(void 0, geojson, { properties: options.properties });
}
}
var turf_center_of_mass_default = centerOfMass;
exports.centerOfMass = centerOfMass; exports.default = turf_center_of_mass_default;
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