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node_modules/proj4/lib/projections/sterea.js

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+import gauss from './gauss';
+import adjust_lon from '../common/adjust_lon';
+
+export function init() {
+  gauss.init.apply(this);
+  if (!this.rc) {
+    return;
+  }
+  this.sinc0 = Math.sin(this.phic0);
+  this.cosc0 = Math.cos(this.phic0);
+  this.R2 = 2 * this.rc;
+  if (!this.title) {
+    this.title = "Oblique Stereographic Alternative";
+  }
+}
+
+export function forward(p) {
+  var sinc, cosc, cosl, k;
+  p.x = adjust_lon(p.x - this.long0);
+  gauss.forward.apply(this, [p]);
+  sinc = Math.sin(p.y);
+  cosc = Math.cos(p.y);
+  cosl = Math.cos(p.x);
+  k = this.k0 * this.R2 / (1 + this.sinc0 * sinc + this.cosc0 * cosc * cosl);
+  p.x = k * cosc * Math.sin(p.x);
+  p.y = k * (this.cosc0 * sinc - this.sinc0 * cosc * cosl);
+  p.x = this.a * p.x + this.x0;
+  p.y = this.a * p.y + this.y0;
+  return p;
+}
+
+export function inverse(p) {
+  var sinc, cosc, lon, lat, rho;
+  p.x = (p.x - this.x0) / this.a;
+  p.y = (p.y - this.y0) / this.a;
+
+  p.x /= this.k0;
+  p.y /= this.k0;
+  if ((rho = Math.sqrt(p.x * p.x + p.y * p.y))) {
+    var c = 2 * Math.atan2(rho, this.R2);
+    sinc = Math.sin(c);
+    cosc = Math.cos(c);
+    lat = Math.asin(cosc * this.sinc0 + p.y * sinc * this.cosc0 / rho);
+    lon = Math.atan2(p.x * sinc, rho * this.cosc0 * cosc - p.y * this.sinc0 * sinc);
+  }
+  else {
+    lat = this.phic0;
+    lon = 0;
+  }
+
+  p.x = lon;
+  p.y = lat;
+  gauss.inverse.apply(this, [p]);
+  p.x = adjust_lon(p.x + this.long0);
+  return p;
+}
+
+export var names = ["Stereographic_North_Pole", "Oblique_Stereographic", "Polar_Stereographic", "sterea","Oblique Stereographic Alternative","Double_Stereographic"];
+export default {
+  init: init,
+  forward: forward,
+  inverse: inverse,
+  names: names
+};