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53 lines
1.8 KiB
53 lines
1.8 KiB
var pi = 3.14159265358979324
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var a = 6378245.0
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var ee = 0.00669342162296594323
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/**
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* WGS84坐标转换GCJ02坐标
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* @param wgLat：wgs纬度
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* @param wgLon：wgs经度
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* @return Array[lat:gcj纬度,lon:gcj经度]
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*/
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function wgs84togcj02(wgLat, wgLon) {
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var mgLat, mgLon
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if (outOfChina(wgLat, wgLon)) {
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mgLat = wgLat
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mgLon = wgLon
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return
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}
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var dLat = transformLat(wgLon - 105.0, wgLat - 35.0)
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var dLon = transformLon(wgLon - 105.0, wgLat - 35.0)
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var radLat = (wgLat / 180.0) * pi
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var magic = Math.sin(radLat)
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magic = 1 - ee * magic * magic
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var 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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mgLat = wgLat + dLat
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mgLon = wgLon + dLon
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var arr = {}
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arr['lat'] = mgLat
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arr['lon'] = mgLon
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return arr
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}
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function outOfChina(lat, lon) {
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if (lon < 72.004 || lon > 137.8347) return true
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if (lat < 0.8293 || lat > 55.8271) return true
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return false
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}
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function transformLat(x, y) {
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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))
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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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}
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function transformLon(x, y) {
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var 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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export default wgs84togcj02
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