本程序是用C编写的数字地图制图实习的源程序，主要实现四个功能：绘制晕线，晕线填充，绘制土堤以及绘制点状符号-this process is the preparation of the C Digital Cartography internship program, the four main functions : Drawing halo lines, Halo filled with earth berms and the mapping of drawing point symbols

绘制点、线、面等符号的小系统，另外还能够绘制特定的地图符号-Draw points, lines, symbols and other small systems, in addition to drawing a specific map symbols

c语言画的一些简单的符号，如圆、晕线等。计算机地图制图课的实习结果-some symbols，such as circle