fix: 基准线未添加完退出后无法移动视图的bug

public/static/lib/potree/potree.js

@@ -83523,6 +83523,7 @@ void main()
 				this.viewer.removeEventListener('cancel_insertions', Exit);
 	            //pressExit && this.viewer.inputHandler.removeEventListener('keydown', pressExit);
 	            this.viewer.removeEventListener('global_click', click);
+	            this.viewer.removeEventListener('global_touchstart', click ); 
 	            this.viewer.removeEventListener('global_mousemove', ifAtWrongPlace); 
 	            viewer.dispatchEvent({
 	                type : "CursorChange", action : "remove",  name:"polygon_AtWrongPlace"
@@ -91597,7 +91598,7 @@ void main()
 	                    
 	                    let dir = directions[name];
 	                    if(name == 'top'){
-	                        let baseLine = viewer.scene.measurements.find(e=>e.isBaseLine);  //使基准线在俯视图中水平
+	                        let baseLine = viewer.scene.measurements.find(e=>e.isBaseLine && e.points.length == 2);  //使基准线在俯视图中水平
 	                        let yaw = baseLine ? new Vector2().subVectors(baseLine.points[0], baseLine.points[1]).angle() : 0; 
 	                        dir = baseLine ? {dir: new Vector3(0,0,-1),yaw,pitch: -1.5707963267948966} : directions[name];
 	                    }                        
@@ -91735,7 +91736,7 @@ void main()
 	            
 	            //外部传消息，使进入俯视 
 	            this.addEventListener('enterTopView',()=>{  
-	                let baseLine = viewer.scene.measurements.find(e=>e.isBaseLine);  //使基准线在俯视图中水平
+	                let baseLine = viewer.scene.measurements.find(e=>e.isBaseLine && e.points.length == 2);  //使基准线在俯视图中水平
 	                let yaw = baseLine ? new Vector2().subVectors(baseLine.points[0], baseLine.points[1]).angle() : 0; 
 	                this.switchView('ortho', {dir: new Vector3(0,0,-1),yaw,pitch: -1.5707963267948966}); 
 	            });