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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You should see something that looks like this:. The following are also examples of lists: I suggest creating a directory on your hard drive to keep all of your AutoLisp files in.

When you begin a line with a semicolon, anything you write after will be ignored by AutoLisp. This function prints the expression on the screen and returns the expression.

It looks like a bunch of garbled mess. This always produces the third element of a list. The function princ simply prints to the command line. LISP has been the language of choice for the artificial intelligence in robotics.

AutoLISP Tutorial | AutoLISP Quick Start | CADTutor

What is a variable? So a through z are fair game. Ever try to debug it? If you need to store data, such as a string or integer, you will need to assign a variable name to the data. Defun programimg 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:. Prograimng your arguments together. One can use either real or an integer.

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Assuming the value of variable a is the list 5 10then:. Write notes about your program, what you are doing and what the variables are.

If this is the only place it shows up then my first explanation would be correct. Therefore the exclamation point before the variable name will return nil. Featured blocks of the month Autlisp on bike. To clarify, If I say “type this at the command line: An entity is the smallest object you can place on your screen.

AutoLISP Lesson 1 – Introduction to Lisp Programming

Retrieved from ” http: In fact, you can try this for yourself now. This is a line feed that causes the next printed text to appear on the next line. A program is a list of instructions for your computer to carry out. If you have a variable name for a integer that holds the data for a value that represents a title block selection then I would use something like this setq intTBSelection 3.

AutoLisp echo’s the value to the command line.

AutoLISP Quick Start

The way to get rid of the echo is to use a princ statement without any parameters as the last statement in your program.

The selection set is assigned to variable al. Click the “Files” tab. Lists A list is a variable that has more than one element.

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So, in the example above, to answer Yes to the prompt, you need only type programint but to answer NO, you must type “no”. For example, if a group of items is preceded by an apostrophe, it is treated as a list.

Type this at the command line:.

Erases everything on the drawing screen. AutoLisp uses the setq function to perform this task.

AutoLISP Lesson 1 – Introduction to Lisp Programming –

AutoLisp returned the value of the function you typed in. In the list found in variable b and assigns the new list to b1. What did it return? While inside AutoCAD you can check your variables to see what they are set to. If the value of variable a is the list 2 5 7 9 11then:. Click on the Start button. When I say “type this at the command line” I will put the actual key strokes in red except for the enter key.

Let’s look at the variable CANT. Note the final line inside the function definition: