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node_modules/proj4/lib/projections/mill.js

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+import adjust_lon from '../common/adjust_lon';
+
+/*
+  reference
+    "New Equal-Area Map Projections for Noncircular Regions", John P. Snyder,
+    The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.
+  */
+
+
+/* Initialize the Miller Cylindrical projection
+  -------------------------------------------*/
+export function init() {
+  //no-op
+}
+
+/* Miller Cylindrical forward equations--mapping lat,long to x,y
+    ------------------------------------------------------------*/
+export function forward(p) {
+  var lon = p.x;
+  var lat = p.y;
+  /* Forward equations
+      -----------------*/
+  var dlon = adjust_lon(lon - this.long0);
+  var x = this.x0 + this.a * dlon;
+  var y = this.y0 + this.a * Math.log(Math.tan((Math.PI / 4) + (lat / 2.5))) * 1.25;
+
+  p.x = x;
+  p.y = y;
+  return p;
+}
+
+/* Miller Cylindrical inverse equations--mapping x,y to lat/long
+    ------------------------------------------------------------*/
+export function inverse(p) {
+  p.x -= this.x0;
+  p.y -= this.y0;
+
+  var lon = adjust_lon(this.long0 + p.x / this.a);
+  var lat = 2.5 * (Math.atan(Math.exp(0.8 * p.y / this.a)) - Math.PI / 4);
+
+  p.x = lon;
+  p.y = lat;
+  return p;
+}
+
+export var names = ["Miller_Cylindrical", "mill"];
+export default {
+  init: init,
+  forward: forward,
+  inverse: inverse,
+  names: names
+};