Merge pull request #6039 from plotly/mapbox-getview-scale

Fix mapbox getView scale for Retina display

Author: alexcjohnson

Diff for: draftlogs/6039_fix.md

@@ -0,0 +1 @@
+ - Fix mapbox derived coordinate for Retina displays [[#6039](https://github.com/plotly/plotly.js/pull/6039)]

Diff for: src/plots/mapbox/mapbox.js

@@ -722,11 +722,14 @@ proto.project = function(v) {
 proto.getView = function() {
     var map = this.map;
     var mapCenter = map.getCenter();
-    var center = { lon: mapCenter.lng, lat: mapCenter.lat };
+    var lon = mapCenter.lng;
+    var lat = mapCenter.lat;
+    var center = { lon: lon, lat: lat };
 
     var canvas = map.getCanvas();
-    var w = canvas.width;
-    var h = canvas.height;
+    var w = parseInt(canvas.style.width);
+    var h = parseInt(canvas.style.height);
+
     return {
         center: center,
         zoom: map.getZoom(),