实现了求最短路径的Dijkstra算法，方便操作，可以自已在程序界面上指定每一个点的位置，在界面上空白的地方每点击一下生成一个点-Achieved for the Dijkstra shortest path algorithm to facilitate the operation of their own in the program interface can be specified on the location of each point in the interface areas

implementing dijkstra algorithm using graph terminology