场景新增isAdsorb属性，控制吸附功能

persagy-web-big-edit/src/SBaseEditScene.ts

@@ -240,8 +240,7 @@ export class SBaseEditScene extends SGraphEditScene {
      * @return 新增的管道
      */
     addBasePipe(event: SMouseEvent, legendObj: any): SBasePipe {
-        const anc = this.clickIsAnchor(event);
-
+        const anc = this.isAdsorb ? this.clickIsAnchor(event) :null;
         // 锚点时否存在
         if (anc) {
             const p = anc.mapToScene(0, 0);