一个城市公交地图编辑器，通过打开一个.stm文件来编辑地图，可以添加道路，放大地图，设置街道、公交路线、站点等功能。-A city bus map editor, by opening a. Stm file to edit the map, you can add roads, to enlarge the map, set the streets, bus routes, the site functions.