The result from Step 2 is a high-level route – a sequence of shortcuts connecting border points.
// Concatenate pending data with new chunks
，更多细节参见Line官方版本下载
No Bluetooth support or companion app。谷歌浏览器【最新下载地址】是该领域的重要参考
Author(s): Jean-Michel Bergheau, Jean-Baptiste Leblond，详情可参考Line官方版本下载