高德坐标转gps坐标

vue3实现高德坐标和gps坐标互转：

/**

 * 高德地图坐标转GPS坐标算法

 */

const pi = 3.1415926535897932384626;

const a = 6378245.0; //长半轴

const ee = 0.00669342162296594323; //扁率

//地球坐标系(WGS-84)转火星坐标系(GCJ)

export function WgsToGcj02(wglng, wglat){

    if (outOfChina(wglng, wglat)) {

        var wglnglat={lng:wglng,lat:wglat};

        return wglnglat;

    }

    let dlat = transformLat(wglng - 105.0, wglat - 35.0);

    let dlng = transformLng(wglng - 105.0, wglat - 35.0);

    let radlat = wglat / 180.0 * pi;

    let magic = Math.sin(radlat);

    magic = 1 - ee * magic * magic;

    let sqrtmagic = Math.sqrt(magic);

    dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * pi);

    dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * pi);

    var lng = wglng + dlng;

    var lat = wglat + dlat;

    var mars_point={lng:lng,lat:lat};

    return mars_point;

}

//火星坐标系(GCJ)转地球坐标系(WGS-84)

export function Gcj02ToWgs(wglng, wglat){

    if (outOfChina(wglng, wglat)) {

        var wglnglat={lng:wglng,lat:wglat};

        return wglnglat;

    }

    let dlat = transformLat(wglng - 105.0, wglat - 35.0);

    let dlng = transformLng(wglng - 105.0, wglat - 35.0);

    let radlat = wglat / 180.0 * pi;

    let magic = Math.sin(radlat);

    magic = 1 - ee * magic * magic;

    let sqrtmagic = Math.sqrt(magic);

    dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * pi);

    dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * pi);

    let mglat = wglat + dlat;

    let mglng = wglng + dlng;

    var lng = wglng * 2 - mglng;

    var lat = wglat * 2 - mglat;

    var mars_point={lng:lng,lat:lat};

    return mars_point;

}

//判断是否在国内

export function outOfChina(wglng, wglat){

    if ((wglng < 73.66|| wglng > 135.05) && (wglat < 3.86  || wglat > 53.55)) {

        return true;

    }

    else {

        return false;

    }

}

//纬度转换

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;

}

//经度转换

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;

}