machinery-admin/src/pages/MonitoringScreen2/components/map/coordinate.js

/**  
 * 单点坐标纠偏
 */
const pi = 3.14159265358979324;
const a = 6378245.0;
const ee = 0.00669342162296594323;
const x_pi = 3.14159265358979324 * 3000.0 / 180.0;

function outOfChina(lat, lon) {
  if(lon < 72.004 || lon > 137.8347)
      return true;
  if(lat < 0.8293 || lat > 55.8271)
      return true;
  return false;
};

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;
};

function transformLon(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;
};

// wgs84 转 gcj02
export function transform (location) {
  const [wgLon, wgLat] = location.split(',').map(x => x - 0);
  const latlng = [];
  if(outOfChina(wgLat, wgLon)) {
    latlng[0] = wgLon;
    latlng[1] = wgLat;
    return latlng;
  }
  let dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
  let dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
  const radLat = wgLat / 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);
  dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
  latlng[0] = wgLon + dLon;
  latlng[1] = wgLat + dLat;
  return latlng;
};