Refactoring (in progress) to put most of the logic in Redux reducers.

src/lib/geo.ts

@@ -1,4 +1,3 @@
-
 export interface Point {
   x: number;
   y: number;
@@ -11,21 +10,18 @@ export interface geoPoint {
 
 // cf https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#ECMAScript_(JavaScript/ActionScript,_etc.)
 export const lon2tile = (lon: number, zoom: number) => {
-  const real = ((lon + 180) / 360) * Math.pow(2, zoom);
-  const floor = Math.floor(real);
-  return [floor, real - floor];
+  return ((lon + 180) / 360) * Math.pow(2, zoom);
 };
 export const lat2tile = (lat: number, zoom: number) => {
-  const real =
+  return (
     ((1 -
       Math.log(
         Math.tan((lat * Math.PI) / 180) + 1 / Math.cos((lat * Math.PI) / 180)
       ) /
         Math.PI) /
       2) *
-    Math.pow(2, zoom);
-  const floor = Math.floor(real);
-  return [floor, real - floor];
+    Math.pow(2, zoom)
+  );
 };
 
 export function tile2long(x: number, z: number) {