AutoLISP is a dialect of the programming language Lisp built specifically for use with the full version of AutoCAD and its derivatives, which include AutoCAD Map . Lisp is a family of programming languages, first conceived in and finally implemented in This makes it is the second oldest language still in common. This course is your ultimate guide to learning AutoLISP Programming. You will learn by example with lots of programs.

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The type function will return the data type of a variable. Archived from the original on A loop is necessary if you want to repeat a command.

AutoLISP – Wikipedia

This is part of a long-term process of changing from VBA to. Therefore, without the final call to the princ function, the result of this would be:.

The data for a single line contains the following info:. If you hit the F2 button to bring up the text screen, you should see something that looks like this:.

Let’s rewrite the program using the princ function to stop the echo. Every defined function begins with the declaration defun. Featured blocks of the month Man on bike.


You might find out what a “car of a cdr” is. From Wikipedia, the free encyclopedia.

AutoLISP Quick Start

So, in the example above, to answer Yes to the prompt, you need only type “y” but to answer NO, you must type “no”. Remember that a selection set may contain more than one entity name. You can modify any of the above aitolisp. What is a program?

AutoLISP Lesson 1 – Introduction to Lisp Programming

A program is a list of instructions for your computer to carry out. As you add parentheses, you’re nesting commands become deeper and deeper. The expression can also be written to a file and will appear in the file exactly as it would on the screen.

Can also be used to print a blank line by using no statement after princ. An example of this is defun C: This is very handy when debugging a program. Change the “Save in: If you found this tutorial useful, you might like to consider making a donation.

Lets assume variable a is the selection set and variable i is set to 0. Let’s get to it.

When you used setq a getpoint you assigned the X and Y coordinate numbers to variable a. The way to get rid of the echo is to use a princ statement without any ajtolisp as the last statement in your program. Type in the directory you saved the “myProg” lisp file in. This statement gets the entity list from a2.


The variable name must be in double quotes.

In AutoLisp, that point can be described by a single variable, a list of two elements, the first being the X value and the second being the Y value eg: This is a line feed that causes the next printed text to appear on the next line.

It is built into AutoCAD. To clarify, If I say “type this at the command line: Now lets substitute 20 for the 5 in programung variable c. It looks like a bunch of garbled mess. The above code defines a new function which generates an AutoCAD point object at a given point, with a one-line text object displaying the X and Y coordinates beside it.

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