解决绘制箭头面时连续获取同样的坐标时面坐标计算异常的问题

src/Draw/drawAttackArrow.js

@@ -59,12 +59,17 @@ export default class DrawAttackArrow extends Draw {
           return
         }
         into = '3D'
+        let pos84 = this.cartesian3Towgs84(cartesian, this.viewer)
+        let lastPos84 = cache_positions[cache_positions.length - 1]
+        if(lastPos84 && (lastPos84.lng === pos84.lng && lastPos84.lat === pos84.lat)) {
+          return
+        }
         if (!this.entityHasCreated) {
           let polyline_id = DrawAttackArrow.create_arrow_polygon(this)
           this.points_ids.push(polyline_id)
         }
         this.points_ids.push(this.create_point(cartesian))
-        cache_positions.push(this.cartesian3Towgs84(cartesian, this.viewer))
+        cache_positions.push(pos84)
         isMove = false
       })
       this.event.mouse_right((movement, cartesian) => {