修复bug： 测量工具没有正确释放的问题

src/app/babylon/tool/measure-tool.ts

@@ -2,6 +2,7 @@ import { EventState, Mesh, MeshBuilder, PickingInfo, PointerEventTypes, PointerI
 import { Button, Container, Control, Ellipse, MultiLine, Rectangle, TextBlock } from "@babylonjs/gui";
 import { UIManager } from "../controller/ui-manager";
 import { BabylonUIStyleTool } from "./babylon-ui-style-tool";
+import { TsTool } from "./ts-tool";
 
 /**
  * 测量工具
@@ -114,13 +115,24 @@ export class MeasureTool {
      * 清除测量内容
      */
     clearMeasure() {
-
         for (let i = 0; i < this.allMeasureInfo.length; i++) {
             this.allMeasureInfo[i].dispose();
         }
         this.allMeasureInfo = [];
     }
 
+    /**
+     * 释放某个测量info
+     * @param info 
+     */
+    disposeMeasureInfo(info: MeasureInfo) {
+        TsTool.arrayRemove(MeasureTool.instance.allMeasureInfo, info);
+        if (this.currentMeasureInfo == info) {
+            this.currentMeasureInfo = null;
+        }
+        info.dispose();
+    }
+
     /**
  * 添加测量点
  */
@@ -296,7 +308,7 @@ export class MeasureInfo {
             this.btn_dispose.verticalAlignment = Control.VERTICAL_ALIGNMENT_TOP;
             let instance = this;
             this.btn_dispose.onPointerClickObservable.add(() => {
-                instance.dispose();
+                MeasureTool.instance.disposeMeasureInfo(instance);
             });
             this.btn_dispose.background = BabylonUIStyleTool.c_color_3d_blueBg;
             this.btn_dispose.color = BabylonUIStyleTool.c_color_3d_blue;