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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Now lets substitute 20 for the 5 in the variable c. Therefore the exclamation point before the variable name will return nil. Also, assume variable h contains the real number One can use either real or pdograming integer.

AutoLISP Quick Start

Entity 1 is Index 0Entity 2 is Index 1etc. Man with bag walking. That is why you ended up with Jeff”Jeff” on the command line. Go to the “Tools” drop qutolisp menu and go to “Preferences”. Articles containing potentially dated statements from January All articles containing potentially dated statements.

Let’s look at the variable CANT. Substitutes the new d2 layer for the old d1 layer in the entity list a1and assigns it to the new entity list b3. Why did it print Jeff?


The AutoLisp Beginner’s Tutorial

By using this site, you agree to the Terms of Use and Privacy Policy. This saves room in RAM and also keeps your program from getting corrupted by other programs that do not reset the variables to nil.

AutoLisp provides a number of arithmetic functions and although the format of these functions is consistent with other AutoLisp functions function first, followed by valuesit is not one we are familiar with from school. Archived from the original on You have successfully created an AutoLisp program.

Personal tools Create an account or log in – Approved Editors Only. To use that angle in AutoCAD you have to convert it back to decimal degrees. Defun encloses the entire program and its closing bracket comes after the main body of the program There are different ways of starting a function for example:.

Allows prograaming to substitute one aspect for another. Lets you secure the name of the entity. Assuming the value of variable a is the list 3 7 5 then:.

You can use any variable name you want.

AutoLISP Lesson 1 – Introduction to Lisp Programming

However, it has remained AutoCAD’s main user customizing language. How do you know which ones are being used by AutoCAD? It is used for documentation and explanation of your program. That’s what conditionals are all about; they allow your program to make decisions. Prkgraming everything on the drawing screen.


The function princ simply prints to the command line. Constructs a new list with the new element placed at the begining. AutoLisp returned the value of the function you typed in. Changes a string of text from lower case to upper case, leaving upper case characters as they are. You can’t add nil to 1.

If you want to look at the list in variable aAutoLISP gives you a convenient way to do that from the command line. That Variable now is a list that may look like 5 While inside AutoCAD you can check your variables to see what they are set to. Come and have a chat at our drafters forum. Allows you to select the objects to be changed. There are some other differences, we will get to that in the advanced levels.

NotePad has a bad habit of assuming you want to save it as a text file with the extension txt.