const mapCommon = {}
/**
* @description: 经纬度转墨卡托投影坐标
*/
mapCommon.lonlatTomercator = (lonlat, wkid) => {
const mercator = {
type: 'point',
spatialReference: {
wkid: wkid
},
x: 0,
y: 0
}
const x = parseFloat(lonlat.x) * 20037508.34 / 180
let y = Math.log(Math.tan((90 + parseFloat(lonlat.y)) * Math.PI / 360)) / (Math.PI / 180)
y = y * 20037508.34 / 180
mercator.x = x
mercator.y = y
return mercator
}
/**
* @description: 墨卡托投影坐标转经纬度坐标
*/
mapCommon.mercatorTolonlat = (mercator) => {
const lonlat = {
type: 'point',
x: 0,
y: 0
}
const x = parseFloat(mercator.x) / 20037508.34 * 180
let y = parseFloat(mercator.y) / 20037508.34 * 180
y = 180 / Math.PI * (2 * Math.atan(Math.exp(y * Math.PI / 180)) - Math.PI / 2)
lonlat.x = x
lonlat.y = y
return lonlat
}
/**
* @description: 墨卡托投影坐标转经纬度坐标
*/
mapCommon.mercatorExtentToGeoextent = (extent) => {
const Geoextent = {
xmax: 0,
xmin: 0,
ymax: 0,
ymin: 0
}
const xmax = extent.xmax / 20037508.34 * 180
let ymax = extent.ymax / 20037508.34 * 180
const xmin = extent.xmin / 20037508.34 * 180
let ymin = extent.ymin / 20037508.34 * 180
ymax = 180 / Math.PI * (2 * Math.atan(Math.exp(ymax * Math.PI / 180)) - Math.PI / 2)
ymin = 180 / Math.PI * (2 * Math.atan(Math.exp(ymin * Math.PI / 180)) - Math.PI / 2)
Geoextent.xmax = xmax
Geoextent.ymax = ymax
Geoextent.xmin = xmin
Geoextent.ymin = ymin
return Geoextent
}
/* 地球坐标系(WGS-84)转火星坐标系(GCJ) ---- 开始 ---- */
const pi = 3.14159265358979324
const a = 6378245.0
const ee = 0.00669342162296594323
/**
* @description: 判断是否在国内，不在国内则不做偏移
*/
mapCommon.outOfChina = (lon, lat) => {
if ((lon < 72.004 || lon > 137.8347) && (lat < 0.8293 || lat > 55.8271)) {
return true
} else {
return false
}
}
mapCommon.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
}
mapCommon.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
}
mapCommon.transform = (wgLat, wgLon) => {
const mars_point = {lon: 0, lat: 0}
if (mapCommon.outOfChina(wgLat, wgLon)) {
mars_point.lat = wgLat
mars_point.lon = wgLon
return
}
let dLat = mapCommon.transformLat(wgLon - 105.0, wgLat - 35.0)
let dLon = mapCommon.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)
mars_point.lat = wgLat + dLat
mars_point.lon = wgLon + dLon
}
/* 地球坐标系(WGS-84)转火星坐标系(GCJ) ----结束---- */
const x_pi = 3.14159265358979324 * 3000.0 / 180.0
mapCommon.marsTobaidu = (mars_point) => {
const baidu_point = {lon: 0, lat: 0}
const x = mars_point.lon
const y = mars_point.lat
const z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi)
const theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi)
baidu_point.lon = z * Math.cos(theta) + 0.0065
baidu_point.lat = z * Math.sin(theta) + 0.006
return baidu_point
}
export default mapCommon