: To create a custom command that can be typed into the AutoCAD command line, use the defun function with a C: prefix. For instance, (defun C:HELLO () (prompt "\nHello World!")) defines a new command called HELLO .
: Functions like getpoint , getreal , and getstring pause the routine to ask the user for specific data. AutoLISP in AutoCAD
: Use the setq function to assign a value to a variable, such as (setq myWidth 10.5) . Essential Functions for Automation : To create a custom command that can
: In AutoLISP, the function name always comes first, followed by its arguments. For example, to add two numbers, you write (+ 1 2) instead of 1 + 2 . : Use the setq function to assign a
AutoLISP is a powerful, high-level programming language specifically designed to extend and automate the functionality of AutoCAD. Based on the LISP (LISt Processing) language, it was first introduced in 1986 and has since become the most popular tool for CAD users to create custom commands and streamline repetitive drafting tasks. As an interpreted language, you can run code directly from the AutoCAD command line without needing to compile it first. Core Concepts and Syntax
: Common types include integers, real numbers (decimals), strings (text), and lists. Lists are the heart of the language and can store anything from a simple set of coordinates to complex drawing data.