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- const mapCommon = {}
-
- /**
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- * @description: 经纬度转墨卡托投影坐标
-
- */
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- mapCommon.lonlatTomercator = (lonlat, wkid) => {
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- const mercator = {
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- type: 'point',
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- spatialReference: {
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- wkid: wkid
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- },
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- x: 0,
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- y: 0
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- }
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- const x = parseFloat(lonlat.x) * 20037508.34 / 180
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- let y = Math.log(Math.tan((90 + parseFloat(lonlat.y)) * Math.PI / 360)) / (Math.PI / 180)
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- y = y * 20037508.34 / 180
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- mercator.x = x
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- mercator.y = y
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- return mercator
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- }
-
-
-
- /**
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- * @description: 墨卡托投影坐标转经纬度坐标
-
- */
-
- mapCommon.mercatorTolonlat = (mercator) => {
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- const lonlat = {
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- type: 'point',
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- x: 0,
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- y: 0
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- }
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- const x = parseFloat(mercator.x) / 20037508.34 * 180
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- let y = parseFloat(mercator.y) / 20037508.34 * 180
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- y = 180 / Math.PI * (2 * Math.atan(Math.exp(y * Math.PI / 180)) - Math.PI / 2)
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- lonlat.x = x
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- lonlat.y = y
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- return lonlat
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- }
-
-
-
- /**
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- * @description: 墨卡托投影坐标转经纬度坐标
-
- */
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- mapCommon.mercatorExtentToGeoextent = (extent) => {
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- const Geoextent = {
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- xmax: 0,
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- xmin: 0,
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- ymax: 0,
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- ymin: 0
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- }
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- const xmax = extent.xmax / 20037508.34 * 180
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- let ymax = extent.ymax / 20037508.34 * 180
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- const xmin = extent.xmin / 20037508.34 * 180
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- let ymin = extent.ymin / 20037508.34 * 180
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- ymax = 180 / Math.PI * (2 * Math.atan(Math.exp(ymax * Math.PI / 180)) - Math.PI / 2)
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- ymin = 180 / Math.PI * (2 * Math.atan(Math.exp(ymin * Math.PI / 180)) - Math.PI / 2)
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- Geoextent.xmax = xmax
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- Geoextent.ymax = ymax
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- Geoextent.xmin = xmin
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- Geoextent.ymin = ymin
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- return Geoextent
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- }
-
-
-
- /* 地球坐标系(WGS-84)转火星坐标系(GCJ) ---- 开始 ---- */
-
- const pi = 3.14159265358979324
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- const a = 6378245.0
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- const ee = 0.00669342162296594323
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- /**
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- * @description: 判断是否在国内,不在国内则不做偏移
-
- */
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- mapCommon.outOfChina = (lon, lat) => {
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- if ((lon < 72.004 || lon > 137.8347) && (lat < 0.8293 || lat > 55.8271)) {
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- return true
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- } else {
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- return false
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- }
-
- }
-
-
-
- mapCommon.transformLat = (x, y) => {
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- 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))
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- ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0
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- ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0
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- ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0
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- return ret
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- }
-
-
-
- mapCommon.transformLon = (x, y) => {
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- let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
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- ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0
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- ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0
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- ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0
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- return ret
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- }
-
-
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- mapCommon.transform = (wgLat, wgLon) => {
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- const mars_point = {lon: 0, lat: 0}
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- if (mapCommon.outOfChina(wgLat, wgLon)) {
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- mars_point.lat = wgLat
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- mars_point.lon = wgLon
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- return
-
- }
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- let dLat = mapCommon.transformLat(wgLon - 105.0, wgLat - 35.0)
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- let dLon = mapCommon.transformLon(wgLon - 105.0, wgLat - 35.0)
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- const radLat = wgLat / 180.0 * pi
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- let magic = Math.sin(radLat)
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- magic = 1 - ee * magic * magic
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- const sqrtMagic = Math.sqrt(magic)
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- dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi)
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- dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi)
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- mars_point.lat = wgLat + dLat
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- mars_point.lon = wgLon + dLon
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- }
-
- /* 地球坐标系(WGS-84)转火星坐标系(GCJ) ----结束---- */
-
-
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- const x_pi = 3.14159265358979324 * 3000.0 / 180.0
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- mapCommon.marsTobaidu = (mars_point) => {
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- const baidu_point = {lon: 0, lat: 0}
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- const x = mars_point.lon
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- const y = mars_point.lat
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- const z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi)
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- const theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi)
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- baidu_point.lon = z * Math.cos(theta) + 0.0065
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- baidu_point.lat = z * Math.sin(theta) + 0.006
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- return baidu_point
-
- }
-
- export default mapCommon
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