--- a/client/src/map/Maplayer.vue	Fri Sep 21 11:02:24 2018 +0200
+++ b/client/src/map/Maplayer.vue	Fri Sep 21 11:03:20 2018 +0200
@@ -64,10 +64,21 @@
       this.interaction = null;
     },
     createInteraction() {
-      return new Draw({
+      var that = this;
+      this.vectorSource.clear();  // start empty
+      var draw = new Draw({
         source: this.vectorSource,
         type: this.drawMode
       });
+      draw.on("drawstart", function(event) {
+        console.log(event);
+        that.vectorSource.clear();  // remove old features when draw starts
+      });
+      draw.on("drawend", this.drawEnd);
+      return draw;
+    },
+    drawEnd(event) {
+      console.log(event);
     },
     activateInteraction() {
       const interaction = this.createInteraction(this.drawMode);