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fix lat conversion

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This commit is contained in:
cybice 2016-01-29 22:44:34 +03:00
parent 75472d18a3
commit 9ca1407fa0
1 changed files with 4 additions and 2 deletions
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6
src/utils/utils.js
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@ -6,8 +6,8 @@ function latLng2World({lat, lng}) {
const x = (lng / 360 + 0.5);
let y = (0.5 - 0.25 * Math.log((1 + sin) / (1 - sin)) / Math.PI);
y = y < -1 // eslint-disable-line
? -1
y = y < 0 // eslint-disable-line
? 0
: y > 1
? 1
: y;
@ -17,6 +17,8 @@ function latLng2World({lat, lng}) {
function world2LatLng({x, y}) {
const n = Math.PI - 2 * Math.PI * y;
// TODO test that this is faster
// 360 * Math.atan(Math.exp((180 - y * 360) * Math.PI / 180)) / Math.PI - 90;
return {
lat: (180 / Math.PI * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n)))),
lng: x * 360 - 180,