Add features option to draw interaction

src/objectliterals.jsdoc

@@ -388,7 +388,8 @@
 
 /**
  * @typedef {Object} olx.interaction.DrawOptions
- * @property {ol.source.Vector|undefined} source Destination source for the features.
+ * @property {ol.Collection|undefined} features Destination collection for the drawn features.
+ * @property {ol.source.Vector|undefined} source Destination source for the drawn features.
  * @property {number|undefined} snapTolerance Pixel distance for snapping to the
  *     drawing finish (default is 12).
  * @property {ol.geom.GeometryType} type Drawing type ('Point', 'LineString',

src/ol/interaction/drawinteraction.js

@@ -74,6 +74,13 @@ ol.interaction.Draw = function(options) {
    */
   this.source_ = goog.isDef(options.source) ? options.source : null;
 
+  /**
+   * Target collection for drawn features.
+   * @type {ol.Collection}
+   * @private
+   */
+  this.features_ = goog.isDef(options.features) ? options.features : null;
+
   /**
    * Pixel distance for snapping.
    * @type {number}
@@ -473,6 +480,9 @@ ol.interaction.Draw.prototype.finishDrawing_ = function(event) {
     sketchFeature.setGeometry(new ol.geom.MultiPolygon([coordinates]));
   }
 
+  if (!goog.isNull(this.features_)) {
+    this.features_.push(sketchFeature);
+  }
   if (!goog.isNull(this.source_)) {
     this.source_.addFeature(sketchFeature);
   }