Introduction This tutorial is aimed at the AutoCAD users who would like to start learning AutoLisp. I suggest that you go through this tutorial along with the AutoCAD Programmers Reference Guide.
Autocad Lisp Commands
You can then lookup the relevant AutoLisp commands for a more detailed explanation. Hope this helps you and Good Luck in your Lisping - Kenny Ramage Principles of Programming All AutoLisp programs must contain the suffix '.LSP' otherwise AutoCAD will not access them when loading. Use a simple text processor such as Notepad to create and edit your lisp files.
Function (which is simply the program) Is a pre-defined set of instructions that describes a set of actions that AutoLisp is to perform, divided into three sections:. OPERATOR - Getting input. ARGUMENT - Manipulating the input. COMMAND - Using the manipulated input.
Charting Draw out or write out in English what you want your program to do. Variables These are like empty boxes in which to store data, to be used later. In AutoLisp, variables may be a collection of letters or numbers as long as they begin with the letters. Example of legal variables are as follows:. A. ARC1.
POINT1. PNT1. D3 An AutoLisp variable may contain more than one value in a single variable.
A value can be anything, such as:. Real number. String. Integer. Pickset Therefore a variable can store just about anything. Structuring Structure your program in such a way that it is easy to understand, by yourself and everyone else. Keep input statements together.
Keep your arguments together. Keep your commands together.
Track your work with the semicolon. When you begin a line with a semicolon, anything you write after will be ignored by AutoLisp. It is used for documentation and explanation of your program. Write notes about your program, what you are doing and what the variables are. A semicolon does not have to begin the line. (prompt 'This line will print'); This is a comment From where the semicolon begins, the remainder of the line is a comment statement. Parentheses ( ) Parentheses are vital to writing AutoLisp programs.
All commands are surrounded by parentheses. AutoLisp uses parentheses to nest, allowing you to write a command that acts on (evaluates) another command. In turn, that command can act on another.
How to install wiixplorer channel. As you add parentheses, you're nesting commands become deeper and deeper. Remember to come out of the nest with an equal number of parentheses.
Note: Always close what you open. Defun (Define Function) In AutoLisp the name of the program or function must be defined in the first statement, which is done by using the command: (defun functionname body of program ) Defun is the first actual command and is followed by the name of the function (or program). 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:. (defun drawline The first way, you are saying that all variables you plan to use in the program are GLOBAL, which are variables that do not lose their value after the program ends. (defun drawline (/ pntl pnt2) The second way, you are saying that the variables you are using are LOCAL variables, which are variables that have value only for that program and while that program is running. (defun C:drawline The third way, as the first BUT the C: tells AutoCAD to treat that function as any other AutoCAD command.
(defun C:drawline (/ pntl pnt2) The fourth way, as the second, but an AutoCAD command. (defun drawline (a / pntl pnt2) The last, variable a receives the first value to it from outside the program. Data Types Integers Are numbers ranging between -32768 and +32767 without decimal points eg: 1 Reals Are numbers with a decimal point eg: 1.0 Strings Strings are bits of text and can be up to a maximum length of 100 characters eg: Point 1 Lists A list is a variable that has more than one element. A point in your drawing is described by the value of the X co-ordinate and the value of the Y co-ordinate. 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: ( 7 10 ). The following are also examples of lists: ( 5 9 7 2 ) and ( 1.5 2.3 4.9 ). Atoms If a variable has a single indivisible value it is an atom.
For example, each element in the lists above is an atom e.g. 6 or A The type function will return the data type of a variable. For example: (type 'My name') Will return STR meaning 'string'.
In fact, you can try this for yourself now. Type the code above at the AutoCAD command prompt and hit enter. Input Commands (getting info from the user) AutoLisp provides a number of options for getting different types of data from the user. Input Commands getpoint Needs you to pick a point on the screen. Getint Needs an Integer eg: 1.
Getreal Needs a real number eg: 10.00. Getcorner Needs a second point on the screen and draws an elastic window from a previous point.
Getstring Needs a string of text. Getdist Needs a value either by picking on the screen or a number from the keyboard. Getangle Needs an angle either by pointing on the screen or by typing an angle, which will be returned in radians. Getkword Needs a keyword from the user.
Autocad Lisp Commands Free Download
Getvar Will get the value of an AutoCAD system variable. Initget Establishes various options for use by the next getxxx function. Getorient Is similar to the GETANGLE but is affected by the zero-degree base and the direction.
It will always give you the absolute angle using 0 degree base as EAST. Input Command Examples In each of the following examples, enter the code at the AutoCAD prompt to see what happens. (getpoint ' nPick a POINT on the screen:') Pick a point when prompted and AutoCAD will return the value (X Y Z) of that point. Tip: n is a special escaped character that takes you to the next line (like a carriage return). The forward slash character tells AutoLisp to interpret the following character as a special character rather than just as a letter 'n'. The 'n' must be always be lower case. The use of ' n' is purely cosmetic (it doesn't change the way the program works) but it does make everything much easier to read for the user by starting each prompt on a new line.
Caution: Your prompt must always be between quotes, ' prompt' otherwise you will get an error. (getint ' nEnter your age:') Type an integer (such as 34) and AutoLisp will return that number. (getreal ' nEnter a number:') Type a real number (such as 10.51) and AutoLisp will return that number. (getcorner pnt1 ' nPick second point:') Will create an elastic window from the variable called 'pnt1', which must already be defined. (getstring ' nWhat is the day today?:') Type some text and Autolisp will return that text. Or (getstring T ' nWhat is your full name?:') This prompt allows you to enter a string of words separated by spaces. Ordinarily, AutoCAD will interpret a space in the same way it interprets a carriage return.
The T is a special AutoLisp symbol that means 'true' it is used to allow spaces in string input. In fact, you can use any positive integer (such as 1) in place of T but the T symbol helps to make the code more understandable. (getdist ' nHow long is the line?:') Pick two points or type a length and AutoLisp will return that length. (getangle ' nWhat is the angle?:') Pick two points for the angle or type an angle and AutoLisp will return that angle in radians. (initget 1 'Yes NO') (getkword ' nAre you going? (Yes or NO):') Initget will control the next getxxx function and is used to specify a list of valid options or keywords, getkword will accept only one of the words specifies using initget. In this case, the options are 'Yes' or 'No'.
The 1 is an initget bitcode and it means that a null response is not allowed. See the section below for more details. Tip: Just as in native AutoCAD commands, any valid option keyword can be entered simply by typing the upper case part of the keyword. So, in the example above, to answer Yes to the prompt, you need only type 'y' but to answer NO, you must type 'no'. This is used to avoid potential ambiguities when 2 or more options begin with the same letter.
(getvar 'FILLETRAD') Would return the set value of the FILLETRAD system variable (fillet radius) eg: 0. 5. (getorient ' nWhat is the angle?:') Pick two points for the angle or type an angle and AutoLisp will return an angle in radians relative to 0 degrees at East. Initget Bit Codes The number 1 after the initget function in code example 8, above is known as an initget bit code. Initget bit codes can be used to control what type of inputs are allowed.
In this example, 1 is used to disallow a null input. This forces the user to enter one of the specified option keywords rather than just hitting carriage return. Initget Bit Codes 1 Disallow null input. 2 Disallow zero values. 4 Disallow negative values. 8 DO not check limits, even if LIMECHECK is on.
16 Return 3D points rather than 2D points. 32 Use dashed lines when drawing rubber band or box. Example: (initget (+ 1 2 4)) (getint ' nHow old are you?:') Will only accept a positive, non-zero Integer eg: 21 Setq Command Short for (Set Equal) or make one thing equal to another. (setq) is an assignment command, eg: it assigns the value of one variable or constant to another variable. Note: (setq) is the primary assignment command in AutoLisp. The '=' (equals character) is not used as an assignment in AutoLisp.
The equals character is used, but only as a non assignment statement. It does not have the ability to make one variable equal to another as it does in some other programming languages (it is used for a comparison of variables, numbers or strings). (setq a b) This statement assigns the value of b to the variable a so that a becomes the same as b and b is unchanged. Note: The first variable after the (setq) is the one that receives the value.
Watch out for this because it is a potential cause of confusion. Print Commands Prompt (prompt 'Maybe you need a rest') This command is used simply to print a message on the command line. A line feed ( n) is not included so two consecutive prompt commands will print both messages on the same line and without any spaces between them. Therefore, any printing after the prompt must be preceeded by the (terpri) function or n. Terpri This is a line feed that causes the next printed text to appear on the next line. It generally follows the prompt command.
Eg: (prompt 'Hello, how are you?' )(terpri) or (prompt ' nHello, how are you?'
) Prin1 This function prints the expression on the screen and returns the expression. It can be any expression and need not only be a string. The expression can also be written to a file and will appear in the file exactly as it would on the screen. (prin1 'Hello') would print 'Hello'. (prin1 a) would print the value of variable a. (prin1 a f) would print the value of variable a to an open file named in variable f. Princ Is the same as prin1 except that the control characters (') are not printed.
Can also be used to print a blank line by using no statement after princ. (princ 'Hello') would print Hello. Print Same as prin1 except that a new line is printed before the expression and a space is printed after the expression. Setvar This function sets an AutoCAD system variable to a given value and returns that value. The variable name must be in double quotes. Eg: (setvar 'blipmode' 0) returns 0 and will switch blipmode off. 1 would switch it on again.
Doing Arithmetic AutoLisp provides a number of arithmetic functions and although the format of these functions is consistent with other AutoLisp functions (function first, followed by values), it is not one we are familiar with from school. The important thing to remember is that the order of the values is consistent with what we already know.
In other words (/ 27 3) is the same as 27 divided by 3. (+ 1 1) returns 2. (- 2 1) returns 1. (. 2 2) returns 4. (/ 2 1) returns 2. (1+ 1) returns 2 (Incremented).
(1- 2) returns 1 (Decremented). Polar This function returns the point at an angle (in radians) and distance from a given point.
(polar pnt1 ang1 dist1) where pnt1, ang1 and dist1 are 3 previously assigned variables. Inters Examines two lines and returns the point where they intersect even if they do not physically cross one another. (inters pnt1 pnt2 pnt3 pnt4) where pnt1 and pnt2 are the end points of one line and pnt3 and pnt4 are the end points of another. AutoCAD commands in AutoLISP Any AutoCAD command can be used inside your lisp program BUT one must remember that they have to be used exactly as you would in AutoCAD and your RETURN is a double set of Quotes (').
Eg: (command 'line' pnt1 pnt2 ') draws a line from pnt1 to pnt2 and the ' acts as a return to terminate the command. Not all commands require termination since some, like circle are self terminating.
(command 'circle' cen cir) where cen is the centre of the circle and cir is a point on the circumference. You can try this out using some values at the command prompt to see how this works: (command 'circle' '100,100' '150,150') Note: values in expressions must be enclosed in quotes whereas variable names are not. The following code will draw a square using a polyline, specifying 4 points and then C to close: (command 'pline' '50,50' '50,70' '70,70' '70,50' 'c') Elements from a List When you used (setq a (getpoint)) you assigned the X and Y coordinate numbers to variable a. That Variable now is a list that may look like (5 10).
If you want to look at the list in variable a, AutoLISP gives you a convenient way to do that from the command line.!a Placing the! (exclamation mark character) in front of the variable will display the value or values of that variable. Car (X co-ordinate or 1st element) The primary command for taking a list apart, (car) gives you the first element of a list. If the value of variable a is the list (5 10), then: (setq b (car a)) would assign to the variable b the value of the first element in a which is 5. Cdr (second and remaining elements) This is the secondary command for taking a list apart. (cdr) gives you the second and remaining elements of the list, in other words; everything after the first element.
If the value of variable a is the list (2 5 7 9 11), then: (setq b (cdr a)) would assign to variable b the second and remaining elements of the list in variable a which is (5 7 9 11). Cadr (Y co-ordinate or 2nd element) This always produces the second element of a list. Assuming the value of variable a is the list (5 10), then: (setq b (cadr a)) would give b the value 10. Caddr (Z co-ordinate or 3rd element) This always produces the third element of a list. Assuming the value of variable a is the list (3 7 5) then: (setq c (caddr a)) would assign the value 5 to variable c.
Free Lisp Programs- Important! Join our Telegram channel we have tons of others free LISP Templates Coupons Productivity Tools and more. No spam, fast download, mobile and desktop perfect sync. This page is dedicated to LISP programs, some were found online and other are written by KIM talented programmers. Some LISP will be in.FAS or.VLX format and others in readable.LSP. Anyway, they are all loaded through APPLOAD command. If you find this site useful and would like to support it, you can do so simply by clicking the Donate button (Donations are Possible Through PayPal or Through Credit Card) Donations will go for site maintenance and improving its free content, also to support the LISP developers to keep up the good work.
Any suggestions for new lisp are very welcome and we will do our best to make it public for free. For Custom Development of LISP Programs Please Contact Us By Email at [email protected] If its your first time using LISP please check this one for simple instruction: or search youtube for “load autocad lisp”. If you haven’t seen yet AutoLayout Plug-in, better check out this. Command Name What It Does? Link To Download Page With Animated GIF ZLABEL Auto labeling of z values CBRK CBRKA Divide a circle (or an arc) into equal parts LPL Sum polyline length & create text label for the summation RECDIMS Count Rectangle Dimension & arrange them in a table SS Select Similar by Object Type, Layer, Color and linetype XPIPE Create pipes in 3D based on Diameter Input S2 Sum Numbers (Text Entities) place the Result PUT Insert Block At Specified Distance works on Polyline, Line, Spline & Arc.
TBG Change Autocad Background Color (Black To White and Vice Versa) LEGEND Create Automatic Legend Based on user selected layers BAD Break Polyline At Specified Distance LAYLENGTH Sum Polyline Length, Create Table Containing The Sum For Each Layer PIPES Sum up 3D Pipes Length Based On Diameter JB Simple Break LISP LL Label Line / Polyline With Layer Name AD Automatic Dimension multiple lines, Polylines and polylines with arcs SRE Sweep Rectangular Profile Lisp BOXCOUNT Sum Length Of Extruded Rectangles 3D Solid NL Create New Layer Very Very Fast! CX Crop any Xref (image, pdf, dwg) and create a comics style bubble (callout) SPEED Calculate Dirt Jump -Trajectory of a projectile RMO Rotate Multiple Objects Around Their Center DBN ‘Dog Bone’ Transition For CNC Router GW Set Global Width To 0 For All Entities.
Due to its relative simplicity and historical integration within the AutoCAD environment, LISP is a natural first programming language for CAD managers. In this course, Josh Modglin walks through the fundamentals of LISP for AutoCAD, so that you can start using this language to simplify tedious tasks and ease the implementation of standardization. Josh explains what LISP is, the differences between AutoLISP and Visual LISP, how to write it, as well as how to create objects and store information that you can use later. Plus, throughout the course, he shares coding best practices that can help you work efficiently with this functional language. Instructor. By: Shaun Bryant course.
2h 13m 52s. 1,928 viewers. Course Transcript - Josh Hi, I'm Josh Modglin and welcome to LISP fundamentals for AutoCAD. Your desire to watch this course shows you are truly interested to take your AutoCAD skills to the next level.
Whether you have programming skills or not, this course will guide you or any with a basic knowledge of AutoCAD into the world of programming using AutoCAD's first programming language. In this course, we're going to travel through what is LISP and how to write it. So then you can then interact with the user. We're going to create objects and we'll even store information for later use. During the course, you will also learn the basic understanding of good coding practice using this functional language. All of this will give you the ability to simplify tasks especially monotonous ones, and easy implementation of standardization right within your company.
Ultimately, you will have taken your skills with AutoCAD to the next level. Practice while you learn with exercise files. Watch this course anytime, anywhere. Course Contents. Introduction Introduction.
1. LISP Formatting 1. LISP Formatting. 2. LISP Functionality 2. LISP Functionality. 3.
Visual LISP Introduction 3. Visual LISP Introduction.
4. Working with Strings 4.
Working with Strings. 5. Working with Lists 5. Working with Lists. 6. Getting Data From Users 6.
Getting Data From Users. 7. Loops.
8. Selection Sets 8. Selection Sets. 9. Working with Geometry 9.
Working with Geometry. 10. Creating and Editing Graphic Entities 10.
Creating and Editing Graphic Entities. 11. Creating and Editing Non-Graphic Entities 11. Creating and Editing Non-Graphic Entities. 12. Storing Data 12. Storing Data.
13. Loading LISPs and Error Trapping 13. Loading LISPs and Error Trapping.
Conclusion Conclusion.
Job Search Lisp is the second-oldest high-level programming language after Fortran and has changed a great deal since its early days, and a number of dialects have existed over its history. Today, the most widely known general-purpose Lisp dialects are Common Lisp and Scheme. Lisp was invented by John McCarthy in 1958 while he was at the Massachusetts Institute of Technology (MIT). This reference will take you through simple and practical approach while learning LISP Programming language. Audience This reference has been prepared for the beginners to help them understand the basic to advanced concepts related to LISP Programming language.
Prerequisites Before you start doing practice with various types of examples given in this reference, I'm making an assumption that you are already aware about what is a computer program and what is a computer programming language?
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