+++ /dev/null
-
-Proj4js.Proj.gauss = {
-
- init : function() {
- sphi = Math.sin(this.lat0);
- cphi = Math.cos(this.lat0);
- cphi *= cphi;
- this.rc = Math.sqrt(1.0 - this.es) / (1.0 - this.es * sphi * sphi);
- this.C = Math.sqrt(1.0 + this.es * cphi * cphi / (1.0 - this.es));
- this.phic0 = Math.asin(sphi / this.C);
- this.ratexp = 0.5 * this.C * this.e;
- this.K = Math.tan(0.5 * this.phic0 + Proj4js.common.FORTPI) / (Math.pow(Math.tan(0.5*this.lat0 + Proj4js.common.FORTPI), this.C) * Proj4js.common.srat(this.e*sphi, this.ratexp));
- },
-
- forward : function(p) {
- var lon = p.x;
- var lat = p.y;
-
- p.y = 2.0 * Math.atan( this.K * Math.pow(Math.tan(0.5 * lat + Proj4js.common.FORTPI), this.C) * Proj4js.common.srat(this.e * Math.sin(lat), this.ratexp) ) - Proj4js.common.HALF_PI;
- p.x = this.C * lon;
- return p;
- },
-
- inverse : function(p) {
- var DEL_TOL = 1e-14;
- var lon = p.x / this.C;
- var lat = p.y;
- num = Math.pow(Math.tan(0.5 * lat + Proj4js.common.FORTPI)/this.K, 1./this.C);
- for (var i = Proj4js.common.MAX_ITER; i>0; --i) {
- lat = 2.0 * Math.atan(num * Proj4js.common.srat(this.e * Math.sin(p.y), -0.5 * this.e)) - Proj4js.common.HALF_PI;
- if (Math.abs(lat - p.y) < DEL_TOL) break;
- p.y = lat;
- }
- /* convergence failed */
- if (!i) {
- Proj4js.reportError("gauss:inverse:convergence failed");
- return null;
- }
- p.x = lon;
- p.y = lat;
- return p;
- }
-};
-