Respect metersPerUnit in ScaleLine control

externs/olx.js

@@ -275,7 +275,7 @@ olx.interaction.InteractionOptions;
  * Method called by the map to notify the interaction that a browser event was
  * dispatched to the map. If the function returns a falsy value,
  * propagation of the event to other interactions in the map's interactions
- * chain will be prevented (this includes functions with no explicit return). See 
+ * chain will be prevented (this includes functions with no explicit return). See
  * {@link https://developer.mozilla.org/en-US/docs/Glossary/Falsy}
  * @type {function(ol.MapBrowserEvent):boolean}
  * @api

src/ol/control/scaleline.js

@@ -174,6 +174,9 @@ ol.control.ScaleLine.prototype.updateElement_ = function() {
     ol.proj.Units.METERS;
   var pointResolution =
       ol.proj.getPointResolution(projection, viewState.resolution, center, pointResolutionUnits);
+  if (units != ol.control.ScaleLineUnits.DEGREES) {
+    pointResolution *= projection.getMetersPerUnit();
+  }
 
   var nominalCount = this.minWidth_ * pointResolution;
   var suffix = '';

test/spec/ol/control/scaleline.test.js

@@ -1,9 +1,9 @@
-
-
+goog.require('ol');
 goog.require('ol.Map');
 goog.require('ol.View');
 goog.require('ol.control.ScaleLine');
 goog.require('ol.proj');
+goog.require('ol.proj.Projection');
 
 describe('ol.control.ScaleLine', function() {
   var map;
@@ -265,6 +265,40 @@ describe('ol.control.ScaleLine', function() {
       var innerHtml4326 = ctrl.element_.innerHTML;
       expect(innerHtml4326).to.not.be(innerHtml3857);
     });
+
+    it('Projection\'s metersPerUnit affect scale for non-degree units', function() {
+      var ctrl = new ol.control.ScaleLine();
+      ctrl.setMap(map);
+      map.setView(new ol.View({
+        center: [0, 0],
+        zoom: 0,
+        resolutions: [1],
+        projection: new ol.proj.Projection({
+          code: 'METERS',
+          units: 'm',
+          getPointResolution: function(r) {
+            return r;
+          }
+        })
+      }));
+      map.renderSync();
+      expect(ctrl.element_.innerText).to.be('100 m');
+      map.setView(new ol.View({
+        center: [0, 0],
+        zoom: 0,
+        resolutions: [1],
+        projection: new ol.proj.Projection({
+          code: 'PIXELS',
+          units: 'pixels',
+          metersPerUnit: 1 / 1000,
+          getPointResolution: function(r) {
+            return r;
+          }
+        })
+      }));
+      map.renderSync();
+      expect(ctrl.element_.innerText).to.be('100 mm');
+    });
   });
 
   describe('latitude may affect scale line in EPSG:4326', function() {