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node_modules/proj4/lib/projections/eqc.js

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+import adjust_lon from '../common/adjust_lon';
+import adjust_lat from '../common/adjust_lat';
+
+export function init() {
+
+  this.x0 = this.x0 || 0;
+  this.y0 = this.y0 || 0;
+  this.lat0 = this.lat0 || 0;
+  this.long0 = this.long0 || 0;
+  this.lat_ts = this.lat_ts || 0;
+  this.title = this.title || "Equidistant Cylindrical (Plate Carre)";
+
+  this.rc = Math.cos(this.lat_ts);
+}
+
+// forward equations--mapping lat,long to x,y
+// -----------------------------------------------------------------
+export function forward(p) {
+
+  var lon = p.x;
+  var lat = p.y;
+
+  var dlon = adjust_lon(lon - this.long0);
+  var dlat = adjust_lat(lat - this.lat0);
+  p.x = this.x0 + (this.a * dlon * this.rc);
+  p.y = this.y0 + (this.a * dlat);
+  return p;
+}
+
+// inverse equations--mapping x,y to lat/long
+// -----------------------------------------------------------------
+export function inverse(p) {
+
+  var x = p.x;
+  var y = p.y;
+
+  p.x = adjust_lon(this.long0 + ((x - this.x0) / (this.a * this.rc)));
+  p.y = adjust_lat(this.lat0 + ((y - this.y0) / (this.a)));
+  return p;
+}
+
+export var names = ["Equirectangular", "Equidistant_Cylindrical", "eqc"];
+export default {
+  init: init,
+  forward: forward,
+  inverse: inverse,
+  names: names
+};