transGPS.js
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/** 转换坐标点工具 */
var TransGPS = function () {
var location = {lng:'', lat:''};
var pi = 3.14159265358979324;
var a = 6378245.0;
var ee = 0.00669342162296594323;
var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
var transGPS = {
getLocation : function(){
return location;
},
locationMake : function(lng, lat) {
var loc = transGPS.getLocation();
loc.lng = lng;
loc.lat = lat;
return loc;
},
outOfChina : function(lat,lng) {
if (lng < 72.004 || lng > 137.8347)
return 1;
if (lat < 0.8293 || lat > 55.8271)
return 1;
return 0;
},
transformLat : function(x, y) {
var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(x > 0 ? x : -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;
},
transformlng : function(x, y) {
var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(x > 0 ? x : -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;
},
transformFromWGSToGCJ : function(wgLoc) {
var mgLoc = {};
if (1 == transGPS.outOfChina(wgLoc.lat, wgLoc.lng)) {
mgLoc = wgLoc;
return mgLoc;
}
var dLat = transGPS.transformLat(wgLoc.lng - 105.0, wgLoc.lat - 35.0);
var dlng = transGPS.transformlng(wgLoc.lng - 105.0, wgLoc.lat - 35.0);
var radLat = wgLoc.lat / 180.0 * pi;
var magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
var sqrtMagic = Math.sqrt(magic);
dLat = parseFloat((dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi));
dlng = parseFloat((dlng * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi)) ;
mgLoc.lat = parseFloat(wgLoc.lat) + dLat;
mgLoc.lng = parseFloat(wgLoc.lng) + dlng;
return mgLoc;
},
bd_encrypt : function(gcLoc) {
var x = gcLoc.lng, y = gcLoc.lat;
var z = Math.sqrt((x*x)+(y*y)) + 0.00002 * Math.sin((y * x_pi));
var theta = Math.atan2(y, x) + 0.000003 * Math.cos((x * x_pi));
var lng = (z*Math.cos(theta)+0.0065);
var lat = (z*Math.sin(theta)+0.006);
return transGPS.locationMake(lng, lat);
},
/*bd_decrypt : function(bdLoc) {
var x = bdLoc.lng - 0.0065, y = bdLoc.lat - 0.006;
var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
return transGPS.locationMake(z * Math.cos(theta), z * Math.sin(theta));
}*/
}
return transGPS;
}();