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| var D2R = 0.01745329251994329577;
| var PrimeMeridian = require('./constants/PrimeMeridian');
| var units = require('./constants/units');
|
| module.exports = function(defData) {
| var self = {};
| var paramObj = {};
| defData.split("+").map(function(v) {
| return v.trim();
| }).filter(function(a) {
| return a;
| }).forEach(function(a) {
| var split = a.split("=");
| split.push(true);
| paramObj[split[0].toLowerCase()] = split[1];
| });
| var paramName, paramVal, paramOutname;
| var params = {
| proj: 'projName',
| datum: 'datumCode',
| rf: function(v) {
| self.rf = parseFloat(v);
| },
| lat_0: function(v) {
| self.lat0 = v * D2R;
| },
| lat_1: function(v) {
| self.lat1 = v * D2R;
| },
| lat_2: function(v) {
| self.lat2 = v * D2R;
| },
| lat_ts: function(v) {
| self.lat_ts = v * D2R;
| },
| lon_0: function(v) {
| self.long0 = v * D2R;
| },
| lon_1: function(v) {
| self.long1 = v * D2R;
| },
| lon_2: function(v) {
| self.long2 = v * D2R;
| },
| alpha: function(v) {
| self.alpha = parseFloat(v) * D2R;
| },
| lonc: function(v) {
| self.longc = v * D2R;
| },
| x_0: function(v) {
| self.x0 = parseFloat(v);
| },
| y_0: function(v) {
| self.y0 = parseFloat(v);
| },
| k_0: function(v) {
| self.k0 = parseFloat(v);
| },
| k: function(v) {
| self.k0 = parseFloat(v);
| },
| a: function(v) {
| self.a = parseFloat(v);
| },
| b: function(v) {
| self.b = parseFloat(v);
| },
| r_a: function() {
| self.R_A = true;
| },
| zone: function(v) {
| self.zone = parseInt(v, 10);
| },
| south: function() {
| self.utmSouth = true;
| },
| towgs84: function(v) {
| self.datum_params = v.split(",").map(function(a) {
| return parseFloat(a);
| });
| },
| to_meter: function(v) {
| self.to_meter = parseFloat(v);
| },
| units: function(v) {
| self.units = v;
| if (units[v]) {
| self.to_meter = units[v].to_meter;
| }
| },
| from_greenwich: function(v) {
| self.from_greenwich = v * D2R;
| },
| pm: function(v) {
| self.from_greenwich = (PrimeMeridian[v] ? PrimeMeridian[v] : parseFloat(v)) * D2R;
| },
| nadgrids: function(v) {
| if (v === '@null') {
| self.datumCode = 'none';
| }
| else {
| self.nadgrids = v;
| }
| },
| axis: function(v) {
| var legalAxis = "ewnsud";
| if (v.length === 3 && legalAxis.indexOf(v.substr(0, 1)) !== -1 && legalAxis.indexOf(v.substr(1, 1)) !== -1 && legalAxis.indexOf(v.substr(2, 1)) !== -1) {
| self.axis = v;
| }
| }
| };
| for (paramName in paramObj) {
| paramVal = paramObj[paramName];
| if (paramName in params) {
| paramOutname = params[paramName];
| if (typeof paramOutname === 'function') {
| paramOutname(paramVal);
| }
| else {
| self[paramOutname] = paramVal;
| }
| }
| else {
| self[paramName] = paramVal;
| }
| }
| if(typeof self.datumCode === 'string' && self.datumCode !== "WGS84"){
| self.datumCode = self.datumCode.toLowerCase();
| }
| return self;
| };
|
|
