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Study and Application of CAD Secondary Development of VB in the Tunnel Cross-section Design

Wang Hai-shuang

Abstract

According to the requiements of the parameterization drawing,on the base of AutoCAD secondary development methods at present,it combines the strong function that VB faces target's programming,and has introduced the general princidle that AutoCAD carries on secondary development.It is analyzed that VB carries on the realization way of AutoCAD secondary development of VB,Combining the actual conditions,drawing three heart arch tunnel sections in parameter as the example,has stated that the advantage and practicability parameter drawing to the secondary development of AutoCAD of VB.

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Key concepts: Secondary development, Engineering drawing, Development (topology), CAD, Realization (probability), Section (typography), Arch, Base (topology)