AutoLISP程序入门教学资料(国外英文资料).doc

AutoLISP程序入门教学资料(国外英文资料) AutoLISP program entry resources material A brief introduction to AutoLISP. (advantages and disadvantages) AutoLISP language is the main tool of the development of Autocad is the combination of LISP language and Autocad, and Autocad in the growth process of development has played an important role. It is an open structure represented by AutoLISP, the Autocad in the CAD software in the long-term competition in an invincible position. AutoLISP is an interpreted language, can be run directly in Autocad, rather than a compiled language with the help of the original program must be compiled and linked to the compiler to generate executable code modules, the user only needs the help of a text editor (such as DOSs EDIT program) can be programmed. AutoLISP (List Processing Language) is a kind of list processing language? Quot; table is the data structure of AutoLISP language unique, widely used in AutoLISP, the table is an effective method for a large amount of data stored in a variable. AutoCAD to three real example (X Y Z) this form to represent 3D point. Two. The valuation method of AutoLISP Unlike most computer languages use infix method to represent program statements (expression) and the prefix . For example: C language for real number X assignment 125, written: X = 125; Operator = on the operation between X and 125. While AutoLISP has written: (setq X 125) Operator setq on X and 125 before operation. Setq is AutoLISPs main assignment function, almost all variables are in accordance with quot; setq to achieve?. Three. How to add a new command to AutoCAD (or how to define a function) The structure and the procedure of loading In the example below, we will understand the general procedure of AutoLISP language structure, how to define a AutoCAD executable function, the use of setq and how loaded in the AutoCAD program. 1: draw a rectangle (file name lesson.lsp) (defun c:draw_sque (P1 P2 / P3 P4) Defun;;; draw_sque function (setvar cmdecho 0) ;;;;