铁路信号系统中的铁路战场图绘制部分的源程序，接触网运营检修系统演示版的源代码，程序源代码可在VC++6.0下顺利编译。可以绘制一些线路支点、一些特殊用途的符号等-The railway signaling system in the railway battlefield mapping part of the source, the source code of the demo version of OCS operators maintenance system source code c