"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _layer = require("ol/layer");
var _proj = require("ol/proj");
var _source = require("ol/source");
// 导入proj控件,使用其方法注入gcj02坐标系

var PI = Math.PI;
var AXIS = 6378245.0;
var OFFSET = 0.00669342162296594323; // (a^2 - b^2) / a^2

function delta(wgLon, wgLat) {
  var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
  var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
  var radLat = wgLat / 180.0 * PI;
  var magic = Math.sin(radLat);
  magic = 1 - OFFSET * magic * magic;
  var sqrtMagic = Math.sqrt(magic);
  dLat = dLat * 180.0 / (AXIS * (1 - OFFSET) / (magic * sqrtMagic) * PI);
  dLon = dLon * 180.0 / (AXIS / sqrtMagic * Math.cos(radLat) * PI);
  return [dLon, dLat];
}
function outOfChina(lon, lat) {
  if (lon < 72.004 || lon > 137.8347) {
    return true;
  }
  if (lat < 0.8293 || lat > 55.8271) {
    return true;
  }
  return false;
}
function transformLat(x, y) {
  var 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) {
  var 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;
}
var forEachPoint = function forEachPoint(func) {
  return function (input, opt_output, opt_dimension) {
    var len = input.length;
    var dimension = opt_dimension || 2;
    var output;
    if (opt_output) {
      output = opt_output;
    } else if (dimension !== 2) {
      output = input.slice();
    } else {
      output = new Array(len);
    }
    for (var offset = 0; offset < len; offset += dimension) {
      func(input, output, offset);
    }
    return output;
  };
};
var gcj02 = {
  toWGS84: forEachPoint(function (input, output, offset) {
    var lng = input[offset];
    var lat = input[offset + 1];
    if (!outOfChina(lng, lat)) {
      var deltaD = delta(lng, lat);
      lng = lng - deltaD[0];
      lat = lat - deltaD[1];
    }
    output[offset] = lng;
    output[offset + 1] = lat;
  }),
  fromWGS84: forEachPoint(function (input, output, offset) {
    var lng = input[offset];
    var lat = input[offset + 1];
    if (!outOfChina(lng, lat)) {
      var deltaD = delta(lng, lat);
      lng = lng + deltaD[0];
      lat = lat + deltaD[1];
    }
    output[offset] = lng;
    output[offset + 1] = lat;
  })
};
var projzh = {
  ll2smerc: (0, _proj.getTransform)('EPSG:4326', 'EPSG:3857'),
  smerc2ll: (0, _proj.getTransform)('EPSG:3857', 'EPSG:4326')
};

// wgs84 -> gcj02
projzh.ll2gmerc = function (input, opt_output, opt_dimension) {
  var output = gcj02.fromWGS84(input, opt_output, opt_dimension);
  return projzh.ll2smerc(output, output, opt_dimension);
};
// gcj02 -> wgs84
projzh.gmerc2ll = function (input, opt_output, opt_dimension) {
  var output = projzh.smerc2ll(input, input, opt_dimension);
  return gcj02.toWGS84(output, opt_output, opt_dimension);
};
// 3857 -> gcj02
projzh.smerc2gmerc = function (input, opt_output, opt_dimension) {
  var output = projzh.smerc2ll(input, input, opt_dimension);
  output = gcj02.fromWGS84(output, output, opt_dimension);
  return projzh.ll2smerc(output, output, opt_dimension);
};
// gcj02 -> 3857
projzh.gmerc2smerc = function (input, opt_output, opt_dimension) {
  var output = projzh.smerc2ll(input, input, opt_dimension);
  output = gcj02.toWGS84(output, output, opt_dimension);
  return projzh.ll2smerc(output, output, opt_dimension);
};

// 定义GCJ02墨卡托投影坐标系
var gcj02Mecator = new _proj.Projection({
  code: 'GCJ-02',
  // extent不能缺少，OpenLayers frame 渲染的时候需要
  extent: [-20037508.342789244, -20037508.342789244, 20037508.342789244, 20037508.342789244],
  units: 'm'
});

// 将GCJ02墨卡托投影坐标系注册进OpenLayers
(0, _proj.addProjection)(gcj02Mecator);

// 覆盖默认的转换方法
(0, _proj.addCoordinateTransforms)('EPSG:4326', gcj02Mecator, projzh.ll2gmerc, projzh.gmerc2ll);
(0, _proj.addCoordinateTransforms)('EPSG:3857', gcj02Mecator, projzh.smerc2gmerc, projzh.gmerc2smerc);
var getSource = function getSource() {
  return new _source.XYZ({
    projection: gcj02Mecator,
    maxZoom: 18,
    url: '//webrd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}',
    crossOrigin: 'anonymous'
  });
};
var getLayer = function getLayer(_ref) {
  var dark = _ref.dark;
  var mapLayer = new _layer.Tile({
    source: getSource(),
    className: dark && 'ol-map-dark',
    zIndex: 0
  });
  return [mapLayer];
};

// 转换方法
var transform = function transform(coordinate) {
  return (0, _proj.transform)(coordinate, 'EPSG:4326', 'GCJ-02');
};
var _default = exports["default"] = {
  mercator: gcj02Mecator,
  gcj02: gcj02,
  transform: transform,
  getSource: getSource,
  getLayer: getLayer
};
//# sourceMappingURL=AmapImageryProvider.js.map
