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+/**
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+ * 判断经纬度是否超出中国境内
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+ */
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+function isLocationOutOfChina(longitude, latitude) {
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+ if (longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271)
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+ return true;
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+ return false;
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+}
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+
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+
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+/**
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+ * 将WGS-84(国际标准)转为GCJ-02(火星坐标):
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+ */
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+function transformFromWGSToGCJ(longitude, latitude) {
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+ var lat = "";
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+ var lon = "";
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+ var ee = 0.00669342162296594323;
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+ var a = 6378245.0;
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+ var pi = 3.14159265358979324;
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+
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+ if (isLocationOutOfChina(longitude, latitude)) {
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+ lat = latitude;
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+ lon = longitude;
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+ }
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+ else {
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+ var adjustLat = transformLatWithXY(longitude - 105.0, latitude - 35.0);
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+ var adjustLon = transformLonWithXY(longitude - 105.0, latitude - 35.0);
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+ var radLat = latitude / 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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+ adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
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+ adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
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+ latitude = latitude + adjustLat;
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+ longitude = longitude + adjustLon;
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+ }
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+ return { latitude: latitude, longitude: longitude };
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+
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+}
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+
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+function transformFromWGSToGCJArr(longitude, latitude) {
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+ var lat = "";
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+ var lon = "";
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+ var ee = 0.00669342162296594323;
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+ var a = 6378245.0;
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+ var pi = 3.14159265358979324;
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+
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+ if (isLocationOutOfChina(longitude, latitude)) {
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+ lat = latitude;
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+ lon = longitude;
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+ }
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+ else {
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+ var adjustLat = transformLatWithXY(longitude - 105.0, latitude - 35.0);
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+ var adjustLon = transformLonWithXY(longitude - 105.0, latitude - 35.0);
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+ var radLat = latitude / 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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+ adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
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+ adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
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+ latitude = latitude + adjustLat;
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+ longitude = longitude + adjustLon;
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+ }
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+ return [longitude, latitude]
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+}
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+
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+/**
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+ * 将GCJ-02(火星坐标)转为百度坐标(DB-09):
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+ */
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+function transformFromGCJToBaidu(longitude, latitude) {
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+ var pi = 3.14159265358979324 * 3000.0 / 180.0;
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+
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+ var z = Math.sqrt(longitude * longitude + latitude * latitude) + 0.00002 * Math.sin(latitude * pi);
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+ var theta = Math.atan2(latitude, longitude) + 0.000003 * Math.cos(longitude * pi);
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+ var a_latitude = (z * Math.sin(theta) + 0.006);
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+ var a_longitude = (z * Math.cos(theta) + 0.0065);
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+
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+ return { latitude: a_latitude, longitude: a_longitude };
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+}
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+
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+/**
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+ * 将百度坐标(DB-09)转为GCJ-02(火星坐标):
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+ */
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+function transformFromBaiduToGCJ(longitude, latitude) {
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+ var xPi = 3.14159265358979323846264338327950288 * 3000.0 / 180.0;
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+
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+ var x = longitude - 0.0065;
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+ var y = latitude - 0.006;
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+ var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xPi);
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+ var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xPi);
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+ var a_latitude = z * Math.sin(theta);
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+ var a_longitude = z * Math.cos(theta);
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+
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+ return { latitude: a_latitude, longitude: a_longitude };
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+}
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+
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+/**
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+ * 将GCJ-02(火星坐标)转为WGS-84(国际标准):
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+ */
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+function transformFromGCJToWGS(longitude, latitude) {
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+ var threshold = 0.00001;
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+
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+ // The boundary
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+ var minLat = latitude - 0.5;
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+ var maxLat = latitude + 0.5;
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+ var minLng = longitude - 0.5;
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+ var maxLng = longitude + 0.5;
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+
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+ var delta = 1;
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+ var maxIteration = 30;
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+
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+ while (true) {
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+ var leftBottom = transformFromWGSToGCJ(minLat, minLng);
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+ var rightBottom = transformFromWGSToGCJ(minLat, maxLng);
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+ var leftUp = transformFromWGSToGCJ(maxLat, minLng);
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+ var midPoint = transformFromWGSToGCJ((minLat + maxLat) / 2, (minLng + maxLng) / 2);
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+ delta = Math.abs(midPoint.latitude - latitude) + Math.abs(midPoint.longitude - longitude);
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+
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+ if (maxIteration-- <= 0 || delta <= threshold) {
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+ return { latitude: (minLat + maxLat) / 2, longitude: (minLng + maxLng) / 2 };
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+ }
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+
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+ if (isContains({ latitude: latitude, longitude: longitude }, leftBottom, midPoint)) {
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+ maxLat = (minLat + maxLat) / 2;
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+ maxLng = (minLng + maxLng) / 2;
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+ }
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+ else if (isContains({ latitude: latitude, longitude: longitude }, rightBottom, midPoint)) {
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+ maxLat = (minLat + maxLat) / 2;
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+ minLng = (minLng + maxLng) / 2;
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+ }
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+ else if (isContains({ latitude: latitude, longitude: longitude }, leftUp, midPoint)) {
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+ minLat = (minLat + maxLat) / 2;
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+ maxLng = (minLng + maxLng) / 2;
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+ }
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+ else {
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+ minLat = (minLat + maxLat) / 2;
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+ minLng = (minLng + maxLng) / 2;
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+ }
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+ }
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+
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+}
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+
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+function isContains(point, p1, p2) {
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+ return (point.latitude >= Math.min(p1.latitude, p2.latitude) && point.latitude <= Math.max(p1.latitude, p2.latitude)) && (point.longitude >= Math.min(p1.longitude, p2.longitude) && point.longitude <= Math.max(p1.longitude, p2.longitude));
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+}
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+
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+function transformLatWithXY(x, y) {
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+ var pi = 3.14159265358979324;
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+ var lat = -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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+ lat += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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+ lat += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
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+ lat += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
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+ return lat;
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+}
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+
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+function transformLonWithXY(x, y) {
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+ var pi = 3.14159265358979324;
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+ var lon = 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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+ lon += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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+ lon += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
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+ lon += (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 lon;
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+}
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+
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+
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+
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+module.exports = {
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+ isLocationOutOfChina: isLocationOutOfChina,
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+ transformFromWGSToGCJ: transformFromWGSToGCJ,
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+ transformFromGCJToBaidu: transformFromGCJToBaidu,
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+ transformFromBaiduToGCJ: transformFromBaiduToGCJ,
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+ transformFromGCJToWGS: transformFromGCJToWGS,
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+ transformFromWGSToGCJArr: transformFromWGSToGCJArr,
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+}
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zhuzhongjie