对AutoCAD中点和直线命令的开发研究

Exploiting and Realizing of Commands for Points and Lines in AutoCAD

针对ＡｕｔｏＣＡＤ中原有的点、直线命令不便于投影图和画法几何图解的问题，开发了便于空间点、直线投影显示的新命令，且增设了画平行线、垂直线、求交，或、重影点、直线上定点等功能，为ＡｕｔｏＣＡＤ命令添补了空白，使操作简便，投影正确，效率提高２～３倍，为ＡｕｔｏＣＡＤ在ＣＧ／ＣＩ的应用开辟了一条新途径。

Aiming at the problem that the original point and line commands of AutoCAD aren′t convenient for projections showing and graph in Descriptive Geometry,the new commands have been exploited which are convenient for projections showing,moreover the functions have been added for drawing parellel and perpen-dicular lines in space,finding the points of intersection,superimposition,and points of given lines and so on. It filled the gaps incommands and functions of AutoCAD and makes eperation easy,projections correct and efficiency be promoted by double or three times. The paper makes a new way for application of AutoCAD in CG/CI.