refine @dc-modules/plot and fix the issue #26

modules/plot/edit/EditRectangle.js

@@ -42,6 +42,9 @@ class EditRectangle extends Edit {
       this._isMoving = false
       if (this._pickedAnchor && this._pickedAnchor.position) {
         let position = this._clampToGround ? e.surfacePosition : e.position
+        if (!position) {
+          return false
+        }
         this._pickedAnchor.position.setValue(position)
         let properties = this._pickedAnchor.properties.getValue(
           Cesium.JulianDate.now()
@@ -57,21 +60,6 @@ class EditRectangle extends Edit {
     }
   }
 
-  _onMouseMove(e) {
-    this._tooltip.showAt(e.windowPosition, '点击锚点移动,右击结束编辑')
-    if (!this._isMoving) {
-      return
-    }
-    if (this._pickedAnchor && this._pickedAnchor.position) {
-      let properties = this._pickedAnchor.properties.getValue(
-        Cesium.JulianDate.now()
-      )
-      let position = this._clampToGround ? e.surfacePosition : e.position
-      this._pickedAnchor.position.setValue(position)
-      this._positions[properties.index] = position
-    }
-  }
-
   _onRightClick(e) {
     this.unbindEvent()
     this._overlay.positions = Transform.transformCartesianArrayToWGS84Array(