From cffeae7829fd6b9e8478e30150ab950aa4d19624 Mon Sep 17 00:00:00 2001
From: Sebastien Savater <savater.sebastien@gmail.com>
Date: Wed, 29 May 2019 09:24:29 +0200
Subject: [PATCH] Allow overriding of GeoJSON output

---
 spec/suites/layer/GeoJSONSpec.js | 41 ++++++++++++++++++++++++++++++++
 src/layer/GeoJSON.js             |  4 ++--
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/spec/suites/layer/GeoJSONSpec.js b/spec/suites/layer/GeoJSONSpec.js
index 944e9edc522..41f16271193 100644
--- a/spec/suites/layer/GeoJSONSpec.js
+++ b/spec/suites/layer/GeoJSONSpec.js
@@ -471,3 +471,44 @@ describe("L.LayerGroup#toGeoJSON", function () {
 		});
 	});
 });
+
+describe("Overriding #toGeoJSON formatting", function () {
+	it("is possible to overwrite output of #toGeoJSON coordinates", function () {
+		var marker = new L.Marker([-1.4837191022531273, 43.49222084042808]),
+		    layerGroup = new L.LayerGroup([marker]);
+
+		expect(layerGroup.toGeoJSON()).to.eql({
+			type: 'FeatureCollection',
+			features: [{
+				type: 'Feature',
+				properties: {},
+				geometry: {
+					type: 'Point',
+					coordinates: [43.492221, -1.483719]
+				}
+			}]
+		});
+
+		L.GeoJSON.latLngToCoords = function (latlng, precision) {
+			if (typeof precision === 'number') {
+				return latlng.alt !== undefined ?
+					[L.Util.formatNum(latlng.lng, precision), L.Util.formatNum(latlng.lat, precision), L.Util.formatNum(latlng.alt, precision)] :
+					[L.Util.formatNum(latlng.lng, precision), L.Util.formatNum(latlng.lat, precision)];
+			} else {
+				return latlng.alt !== undefined ? [latlng.lng, latlng.lat, latlng.alt] : [latlng.lng, latlng.lat];
+			}
+		};
+
+		expect(layerGroup.toGeoJSON()).to.eql({
+			type: 'FeatureCollection',
+			features: [{
+				type: 'Feature',
+				properties: {},
+				geometry: {
+					type: 'Point',
+					coordinates: [43.49222084042808, -1.4837191022531273]
+				}
+			}]
+		});
+	});
+});
diff --git a/src/layer/GeoJSON.js b/src/layer/GeoJSON.js
index 2efe7b4bd17..07e95518d56 100644
--- a/src/layer/GeoJSON.js
+++ b/src/layer/GeoJSON.js
@@ -258,7 +258,7 @@ export function latLngsToCoords(latlngs, levelsDeep, closed, precision) {
 	for (var i = 0, len = latlngs.length; i < len; i++) {
 		coords.push(levelsDeep ?
 			latLngsToCoords(latlngs[i], levelsDeep - 1, closed, precision) :
-			latLngToCoords(latlngs[i], precision));
+			GeoJSON.latLngToCoords(latlngs[i], precision));
 	}
 
 	if (!levelsDeep && closed) {
@@ -292,7 +292,7 @@ var PointToGeoJSON = {
 	toGeoJSON: function (precision) {
 		return getFeature(this, {
 			type: 'Point',
-			coordinates: latLngToCoords(this.getLatLng(), precision)
+			coordinates: GeoJSON.latLngToCoords(this.getLatLng(), precision)
 		});
 	}
 };