OpenLayers LineString


### polyline
stroke feature - image 아니라 stroke

[OpenLayers Smoothing LineString](https://texonom.com/openlayers-smoothing-linestring-f74af1f80bc0406db37b7551dcd75a52)


```typefunction makeStyle() {  /**   * @summary - Make Diverse Style   * @function   */  let styles = {}  let lBlueI = new Stroke({ color: BLUE, width: DFT_WIDTH })  styles = {    strokeBlue: new Style({ stroke: lBlueI })  }  return styles}```







