Autocad Lisp Programs

1. Autocad Autolisp Programs Download
2. Autocad Autolisp Programs Free Download
3. Autocad Lisp Programming Tutorials

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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 3D, AutoCAD Architecture and AutoCAD Mechanical.^[1] Neither the application programming interface (API) nor the interpreter to execute AutoLISP code are included in the AutoCAD LT product line.^[2]

Features[edit]

AutoLISP is a small, dynamically scoped, dynamically typed Lisp language dialect with garbage collection, immutable list structure, and settable symbols, lacking in such regular Lisp features as macro system, records definition facilities, arrays, functions with variable number of arguments or let bindings. Aside from the core language, most of the primitive functions are for geometry, accessing AutoCAD's internal DWG database, or manipulation of graphical entities in AutoCAD. The properties of these graphical entities are revealed to AutoLISP as association lists in which values are paired with AutoCAD group codes that indicate properties such as definitional points, radii, colors, layers, linetypes, etc. AutoCAD loads AutoLISP code from .LSP files.^[3]

AutoLISP code can interact with the user through AutoCAD's graphical editor by use of primitive functions that allow the user to pick points, choose objects on screen, and input numbers and other data. AutoLisp also has a built-in graphical user interface (GUI) mini- or domain-specific language (DSL), the Dialog Control Language, for creating modal dialog boxes with automated layout, within AutoCAD.^[3]

History[edit]

Autocad Autolisp Programs Download

AutoLISP was derived from an early version of XLISP, which was created by David Betz.^[4] The language was introduced in AutoCAD Version 2.18 in January 1986, and continued to be enhanced in successive releases up to release 13 in February 1995. After that, its development was neglected by Autodesk in favor of more fashionable development environments like Visual Basic for Applications (VBA), .NET Framework, and ObjectARX. However, it has remained AutoCAD's main user customizing language.

Vital-LISP, a considerably enhanced version of AutoLISP including an integrated development environment (IDE), debugger, compiler, and ActiveX support, was developed and sold by third party developer Basis Software. Vital LISP was a superset of the existing AutoLISP language that added VBA-like access to the AutoCAD object model, reactors (event handling for AutoCAD objects), general ActiveX support, and some other general Lisp functions. Autodesk purchased this, renamed it Visual LISP, and briefly sold it as an add-on to AutoCAD release 14 released in May 1997. It was incorporated into AutoCAD 2000 released in March 1999, as a replacement for AutoLISP. Since then, Autodesk has ceased major enhancements to Visual LISP and focused more effort on VBA and .NET, and C++. As of January 31, 2014, Autodesk no longer supports VBA versions older than 7.1. This is part of a long-term process of changing from VBA to .NET for user customizing.^[5][6]

AutoLISP has such a strong following that other computer-aided design (CAD) application vendors add it to their products. Bricscad, IntelliCAD and others have AutoLISP functionality, so that AutoLISP users can consider using them as an alternative to AutoCAD. Most development involving AutoLISP since AutoCAD 2000 is performed within Visual LISP since the original AutoLISP engine was replaced with the Visual LISP engine. There are thousands of utilities and applications that have been developed using AutoLISP or Visual LISP (distributed as LSP, FAS and VLX files).^[7][8]

Examples[edit]

Cummins incal software. A simple Hello world program in AutoLISP would be:

Note the final line inside the function definition: when evaluated with no arguments, the princ function returns a null symbol, which is not displayed by the AutoCAD command-line interface. As the AutoCAD command line functions as a read–eval–print loop (REPL), this would normally print 'Hello World!' to the command line, followed immediately by the return value of the call to princ. Therefore, without the final call to the princ function, the result of this would be:

Hello World!'nHello World!'

The prin1 function may also be used to achieve the same result.

A more complex example might be:

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. The name of the function includes a special prefix 'c:', which causes AutoCAD to recognize the function as a regular command. The user, upon typing 'pointlabel' at the AutoCAD command line, would be prompted to pick a point, either by typing the X and Y coordinates, or clicking a location in the drawing. The function would then place a marker at that point, and create a one-line text object next to it, containing the X and Y coordinates of the point expressed relative to the active User Coordinate System (UCS). The function requires no parameters, and contains one local variable ('pnt').

The above example could also be written using built-in AutoCAD commands to achieve the same result, however this approach is susceptible to changes to the command prompts between AutoCAD releases.

References[edit]

1. ^'AutoLISP'. Retrieved 14 April 2014.
2. ^'AutoCAD LT vs. AutoCAD'. Archived from the original on 15 April 2014. Retrieved 14 April 2014.
3. ^ ^ab'AutoLISP Developer's Guide'(PDF). Retrieved 14 April 2014.
4. ^'History of AutoLISP'.
5. ^'Microsoft Visual Basic for Applications Module FAQ'. Retrieved 14 April 2014.
6. ^'VBA support in AutoCAD 2011'. Archived from the original on 15 April 2014. Retrieved 14 April 2014.
7. ^'BricsCAD Compare versions'. Archived from the original on 2014-03-15. Retrieved 14 April 2014.
8. ^'IntelliCAD CAD Platform – Features and Benefits'. Retrieved 14 April 2014.

External links[edit]

Load AutoLISP routines at start up and execute commands or functions at specific times during a drawing session.

AutoCAD-based products load the contents of three user-definable files automatically: acad.lsp, acaddoc.lsp, and the MNL file that accompanies your current customization file.

By default, the acad.lsp file is loaded only once, when the program starts, whereas acaddoc.lsp is loaded with each individual document (or drawing). This lets you associate the loading of the acad.lsp file with application startup, and the acaddoc.lsp file with document (or drawing) startup. The default method for loading these startup files can be modified by changing the setting of the ACADLSPASDOC system variable.

If one of these files defines a function of the special type S::STARTUP, this routine runs immediately after the drawing is fully initialized. As an alternative, the APPLOAD command provides a Startup Suite option that loads the specified applications without the need to edit any files.

The acad.lsp and acaddoc.lsp startup files are not provided with AutoCAD-based products. It is up to the user to create and maintain these files.

Command Autoloader

When you load an AutoLISP file, the command definitions in the file take up memory whether or not you actually use the commands. The AutoLISP autoload function makes a command available without loading the entire routine into memory. Adding the following code to your acaddoc.lsp file automatically loads the commands CMD1, CMD2, and CMD3 from the cmds.lsp file and the NEWCMD command from the newcmd.lsp file.

The first time you enter an automatically loaded command at the Command prompt, AutoLISP loads the entire command definition from the associated file. AutoLISP also provides the autoarxload function for ObjectARX applications.

The ACAD.LSP File

You can create an acad.lsp file if you regularly use specific AutoLISP routines. When you start AutoCAD, it searches the support file search path for an acad.lsp file. If an acad.lsp file is found, it is loaded into memory.

Because the acad.lsp file is intended to be used for application-specific startup routines, all functions and variables defined in an acad.lsp file are only available in the first drawing. You will probably want to move routines that should be available in all documents from your acad.lsp file into the acaddoc.lsp file.

The recommended functionality of acad.lsp and acaddoc.lsp can be overridden with the ACADLSPASDOC system variable. If the ACADLSPASDOC system variable is set to 0 (the default setting), the acad.lsp file is loaded just once: upon application startup. If set to 1, the acad.lsp file is reloaded when a new drawing is created or an existing drawing file is opened.

The acad.lsp file can contain AutoLISP code for one or more routines, or just a series of load function calls. The latter method is preferable, because modification is easier. If you save the following code as an acad.lsp file, the files mysessionapp1.lsp, databasesynch.lsp, and drawingmanager.lsp are loaded every time you start the program.

The ACADDOC.LSP File

The acaddoc.lsp file is intended to be associated with each document (or drawing) initialization. This file is useful if you want to load a library of AutoLISP routines to be available every time you start a new drawing (or open an existing drawing).

Each time a drawing opens, AutoCAD searches the library path for an acaddoc.lsp file. If it finds one, it loads the file into memory. The acaddoc.lsp file is always loaded with each drawing regardless of the settings of ACADLSPASDOC.

Most users will have a single acaddoc.lsp file for all document-based AutoLISP routines. The program searches for an acaddoc.lsp file in the order defined by the library path; therefore, with this feature, you can have a different acaddoc.lsp file in each drawing directory, which would load specific AutoLISP routines for certain types of drawings or jobs.

The acaddoc.lsp file can contain AutoLISP code for one or more routines, or just a series of load function calls. The latter method is preferable, because modification is easier. If you save the following code as an acaddoc.lsp file, the files mydocumentapp1.lsp, build.lsp, and counter.lsp are loaded every time a new document is opened.

MNL Files and AutoLISP Menu Customization

When the program loads a customization (CUI/CUIx) file, it searches for an MNL file with a matching file name. If it finds the file, it loads the file into memory. This function ensures that the AutoLISP functions that are needed for proper operation of user interface elements are loaded.

For example, the customization file acad.cuix looks for the file acad.mnl Chicken hunter game. which might define numerous AutoLISP functions used by user interface elements in the customization file. The MNL file is loaded after the acaddoc.lsp file.

In this example, calls to the princ function can be used to display status messages. The first use of princ displays the following at the command prompt:

Newmenu utilities… Loaded.

The second call to princ exits the AutoLISP function. Without this second call to princ, the message would be displayed twice. As mentioned previously, you can include the onfailure argument with calls to the load function as an extra precaution.

S::STARTUP Function: Postinitialization Execution

You can define an S::STARTUP function to perform any needed setup operations after the drawing is initialized.

The startup LISP files (acad.lsp, acaddoc.lsp, and MNL) are all loaded into memory before the drawing is completely initialized. Typically, this does not pose a problem, unless you want to use the command function, which is not guaranteed to work until after a drawing is initialized.

If the user-defined function S::STARTUP is included in an acad.lsp, acaddoc.lsp, or MNL file, it is called when you enter a new drawing or open an existing drawing. Thus, you can include a definition of S::STARTUP in the AutoLISP startup file to perform any setup operations.

For example, if you want to override the standard HATCH command by adding a message and then switching to the BHATCH command, use an acaddoc.lsp file that contains the following:

Before the drawing is initialized, new definitions for HATCH and OLDHATCH are defined with the defun function. After the drawing is initialized, the S::STARTUP function is called and the standard definition of HATCH is undefined.

Because an S::STARTUP function can be defined in many places (an acad.lsp, acaddoc.lsp, or MNL file or any other AutoLISP file loaded from any of these), it's possible to overwrite a previously defined S::STARTUP function.

The following example shows one method of ensuring that your startup function works with other functions.

.. your startup function ..

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The previous code appends your startup function to that of an existing S::STARTUP function and then redefines the S::STARTUP function to include your startup code. This works properly regardless of the prior existence of an S::STARTUP function.

Autocad Lisp Programming Tutorials