google-maps-drawing-tools
Version:
Unified drawing tools for Google Maps
24 lines • 4.04 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const d2r = Math.PI / 180; // degrees to radians
const r2d = 180 / Math.PI; // radians to degrees
const earthsRadius = 3963; // 3963 is the radius of the earth in miles
const metersToMilesMultiplier = 0.000621371;
function createCircle({ lat, lng, radius, points = 32, }) {
// radius in miles
radius = radius * metersToMilesMultiplier;
// find the raidus in lat/lon
let rlat = (radius / earthsRadius) * r2d;
let rlng = rlat / Math.cos(lat * d2r);
let path = [];
// one extra here makes sure we connect the
for (let i = 0; i < points + 1; i++) {
let theta = Math.PI * (i / (points / 2));
let ex = lng + rlng * Math.cos(theta); // center a + radius x * cos(theta)
let ey = lat + rlat * Math.sin(theta); // center b + radius y * sin(theta)
path.push(new google.maps.LatLng(ey, ex));
}
return path;
}
exports.default = createCircle;
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