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const pi = 3.1415926535897932384626;
const xpi = (pi * 3000.0) / 180.0;
const a = 6378245.0;
const ee = 0.00669342162296594323;
export function transformLat(x, y) {
let ret =
-100.0 +
2.0 * x +
3.0 * y +
0.2 * y * y +
0.1 * x * y +
0.2 * Math.sqrt(Math.abs(x));
ret +=
((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) *
2.0) /
3.0;
ret +=
((20.0 * Math.sin(y * pi) + 40.0 * Math.sin((y / 3.0) * pi)) * 2.0) /
3.0;
ret +=
((160.0 * Math.sin((y / 12.0) * pi) + 320 * Math.sin((y * pi) / 30.0)) *
2.0) /
3.0;
return ret;
}
export function transformLng(x, y) {
let ret =
300.0 +
x +
2.0 * y +
0.1 * x * x +
0.1 * x * y +
0.1 * Math.sqrt(Math.abs(x));
ret +=
((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) *
2.0) /
3.0;
ret +=
((20.0 * Math.sin(x * pi) + 40.0 * Math.sin((x / 3.0) * pi)) * 2.0) /
3.0;
ret +=
((150.0 * Math.sin((x / 12.0) * pi) +
300.0 * Math.sin((x / 30.0) * pi)) *
2.0) /
3.0;
return ret;
}
export function BD2GCJ(p) {
const x = p.lng - 0.0065;
const y = p.lat - 0.006;
const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xpi);
const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xpi);
const lng = z * Math.cos(theta);
const lat = z * Math.sin(theta);
return {lng, lat};
}
export function GCJ2BD(p) {
const x = p.lng;
const y = p.lat;
const z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * xpi);
const theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * xpi);
const lng = z * Math.cos(theta) + 0.0065;
const lat = z * Math.sin(theta) + 0.006;
return {lng, lat};
}
export function GPS2GCJ(p) {
let dlat = transformLat(p.lng - 105.0, p.lat - 35.0);
let dlng = transformLng(p.lng - 105.0, p.lat - 35.0);
const radLat = (p.lat / 180.0) * pi;
let magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
const sqrtMagic = Math.sqrt(magic);
dlat = (dlat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * pi);
dlng = (dlng * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi);
return {
lng: p.lng + dlng,
lat: p.lat + dlat,
};
}
export function GCJ2GPS(p) {
const pp = GPS2GCJ(p);
const lng = 2 * p.lng - pp.lng;
const lat = 2 * p.lat - pp.lat;
return {lng, lat};
}
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