优化:双指移动时轻微防抖

src/Editor/CameraControls.ts

@@ -1,5 +1,6 @@
 import { Vector3 } from 'three';
 import { KeyBoard, MouseKey } from '../Common/KeyEnum';
+import { equaln } from '../Geometry/GeUtils';
 import { CameraType } from '../GraphicsSystem/CameraUpdate';
 import { Viewer } from '../GraphicsSystem/Viewer';
 import { CommandStore } from '../UI/Store/CommandStore';
@@ -170,8 +171,11 @@ export class CameraControls
                     let dy = event.touches[0].pageY - event.touches[1].pageY;
 
                     let distance = Math.sqrt(dx * dx + dy * dy);
-                    this.Viewer.Zoom(this.DollyStart / distance, this._TouchScaleCenterWCS);
-                    this.DollyStart = distance;
+                    if (!equaln(this.DollyStart / distance, 1, 0.05))//轻微防抖
+                    {
+                        this.Viewer.Zoom(this.DollyStart / distance, this._TouchScaleCenterWCS);
+                        this.DollyStart = distance;
+                    }
 
                     //move
                     let nowCenter = new Vector3((event.touches[0].clientX + event.touches[1].clientX) * 0.5, (event.touches[0].clientY + event.touches[1].clientY) * 0.5, 0);