stop map animation on zoomstart, fix #1002

Author: fuzhenn

src/map/Map.Anim.js

@@ -165,6 +165,9 @@ Map.include(/** @lends Map.prototype */{
     },
 
     _animateTo(view, options = {}, step) {
+        if (this._mapAnimPlayer) {
+            this._stopAnim(this._mapAnimPlayer);
+        }
         this._isInternalAnimation = true;
         this._mapAnimPlayer = this.animateTo(view, options, step);
         delete this._isInternalAnimation;

src/map/Map.Zoom.js

@@ -52,6 +52,9 @@ Map.include(/** @lends Map.prototype */{
 
     onZoomStart(nextZoom, origin) {
         if (!this.options['zoomable'] || this.isZooming()) { return; }
+        if (this._mapAnimPlayer) {
+            this._stopAnim(this._mapAnimPlayer);
+        }
         this._zooming = true;
         this._startZoomVal = this.getZoom();
         this._startZoomCoord = this._containerPointToPrj(origin);