Add duration and easing options to view.fit() for animations

src/ol/view.js

@@ -735,7 +735,6 @@ ol.View.prototype.fit = function(geometry, size, opt_options) {
     }
     resolution = constrainedResolution;
   }
-  this.setResolution(resolution);
 
   // calculate center
   sinAngle = -sinAngle; // go back to original rotation
@@ -745,8 +744,19 @@ ol.View.prototype.fit = function(geometry, size, opt_options) {
   centerRotY += (padding[0] - padding[2]) / 2 * resolution;
   var centerX = centerRotX * cosAngle - centerRotY * sinAngle;
   var centerY = centerRotY * cosAngle + centerRotX * sinAngle;
+  var center = [centerX, centerY];
 
-  this.setCenter([centerX, centerY]);
+  if (options.duration !== undefined) {
+    this.animate({
+      resolution: resolution,
+      center: center,
+      duration: options.duration,
+      easing: options.easing
+    });
+  } else {
+    this.setResolution(resolution);
+    this.setCenter(center);
+  }
 };