用VC编写的程序源代码，用来实现对话框中DEM简化和坐标转换的过程-VC prepared by the program's source code used for dialog and DEM simplify the process of coordinate transformation

基于VC的任意选坐标点直线光栅扫描转换算法实现-VC-based linear coordinate points in any election raster scan conversion algorithm