Our graph node is represented by a MapTile class, which has information that stores if the current node is walkable or not, which neighboring tiles it is connected to and its x, y coordinates.

• 我们图的节点是由MapTile一流的，它的信息存储，如果当前节点是步行游览或没有，这是周边瓷砖连接和其X，Y坐标。