imporve @dc-modules/plot

modules/plot/Plot.js

     this._plotEvent.addEventListener(this._completeCallback, this)
   }
 
+  /**
+   *
+   * @param type
+   * @param style
+   * @private
+   */
   _createDrawWorker(type, style) {
     switch (type) {
       case OverlayType.POINT:
     }
   }
 
+  /**
+   *
+   * @param overlay
+   * @private
+   */
   _createEditWorker(overlay) {
     switch (overlay.type) {
       case OverlayType.POINT:
     }
   }
 
-  draw(type, callback, style) {
+  /**
+   *
+   * @param type
+   * @param callback
+   * @param style
+   * @param clampToGround
+   * @returns {Plot}
+   */
+  draw(type, callback, style, clampToGround) {
     this._state = 'draw'
     if (this._drawWorker) {
       this._drawWorker.unbindEvent()
     this._viewer.tooltip.enable = true
     this._bindEvent(callback)
     this._createDrawWorker(type, style)
-    this._drawWorker && this._drawWorker.start(this)
+    this._drawWorker &&
+      this._drawWorker.start(this, clampToGround ?? this._options.clampToGround)
+    return this
   }
 
-  edit(overlay, callback) {
+  /**
+   *
+   * @param overlay
+   * @param callback
+   * @param clampToGround
+   * @returns {Plot}
+   */
+  edit(overlay, callback, clampToGround) {
     this._state = 'edit'
     if (this._editWorker) {
       this._editWorker.unbindEvent()
     this._viewer.tooltip.enable = true
     this._bindEvent(callback)
     this._createEditWorker(overlay)
-    this._editWorker && this._editWorker.start(this)
+    this._editWorker &&
+      this._editWorker.start(this, clampToGround ?? this._options.clampToGround)
+    return this
   }
 
+  /**
+   *
+   * @returns {Plot}
+   */
   destroy() {
     this._plotEvent.removeEventListener(this._completeCallback, this)
     this._viewer.dataSources.remove(this._overlayLayer)
     this._viewer.dataSources.remove(this._anchorLayer)
     this._viewer = undefined
     this._plotEvent = undefined
+    return this
   }
 }
 

modules/plot/draw/Draw.js

     this._viewer.off(MouseEventType.RIGHT_CLICK, this._onRightClick, this)
   }
 
+  /**
+   *
+   * @param position
+   * @param isCenter
+   * @returns {*}
+   */
   createAnchor(position, isCenter = false) {
     return this._layer.add({
       position: position,
     })
   }
 
-  start(plot) {
+  /**
+   *
+   * @param plot
+   * @param clampToGround
+   */
+  start(plot, clampToGround) {
     this._viewer = plot.viewer
     this._tooltip = plot.viewer.tooltip
     this._layer = plot.overlayLayer
     this._plotEvent = plot.plotEvent
     this._options = plot.options
-    this._clampToGround = plot.options.clampToGround ?? true
+    this._clampToGround = clampToGround
     this._mountEntity()
     this.bindEvent()
   }

modules/plot/edit/Edit.js

     this._viewer.off(MouseEventType.RIGHT_CLICK, this._onRightClick, this)
   }
 
+  /**
+   *
+   * @param position
+   * @param index
+   * @param isMid
+   * @param isCenter
+   */
   createAnchor(position, index, isMid = false, isCenter = false) {
     let image = isMid
       ? this._options.icon_midAnchor
     this._anchors.push(anchor)
   }
 
+  /**
+   *
+   * @param p1
+   * @param p2
+   * @returns {Cartesian3}
+   */
   computeMidPosition(p1, p2) {
     let c1 = Cesium.Ellipsoid.WGS84.cartesianToCartographic(p1)
     let c2 = Cesium.Ellipsoid.WGS84.cartesianToCartographic(p2)
     return Cesium.Ellipsoid.WGS84.cartographicToCartesian(cm)
   }
 
-  start(plot) {
+  /**
+   *
+   * @param plot
+   * @param clampToGround
+   */
+  start(plot, clampToGround) {
     this._viewer = plot.viewer
     this._tooltip = plot.viewer.tooltip
     this._layer = plot.overlayLayer
     this._anchorLayer = plot.anchorLayer
     this._plotEvent = plot.plotEvent
     this._options = plot.options
-    this._clampToGround = plot.options.clampToGround ?? true
+    this._clampToGround = clampToGround
     this._mountEntity()
     this._mountAnchor()
     this.bindEvent()