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AutoCAD uses an active area paradigm, wherein objects are placed on an interactive drawing canvas. Object placement commands are called "steps," and once activated, any steps for a particular object can be modified, deleted, or added with ease, regardless of what other steps are also active. Step definitions include such elements as line, polyline, arc, circle, ellipse, rectangle, text, dimension, block, loop, and function. A few other commands, such as "fix" (removing errors from the drawing), can be also applied to steps.
Within the viewport, which may be split into different areas, such as a 2D viewport for viewing the drawing, a 3D viewport for viewing the drawing from multiple angles, or a 2D or 3D drafting viewport, the user may select, delete, or modify the visual properties of any 2D object. A 2D object can also be annotated or labelled (described), which is the current focus of the paper.
AutoCAD is written in the programming language Object Pascal. Object Pascal (or simply Object) was designed by Ole-Johan Dahl and Niklaus Wirth, and is a general-purpose, imperative, object-oriented programming language with a focus on software systems, not on user interfaces. The language offers imperative and object-oriented features. This is not to be confused with the related and unrelated programming language Object Basic.
AutoCAD is considered to be a highly sophisticated design program, capable of tasks ranging from construction of architectural blueprints to production of detailed product drawings and cost estimates. As a drafting program, AutoCAD offers an interactive, not necessarily true-to-scale, view of the current drawing, and the ability to draw vector graphics (lines, curves, arcs, and other curves), with resolution at any level of detail.
AutoCAD is available for the Microsoft Windows operating system. It is able to work with three different desktop configurations (two in 3D, one in 2D):
(a) the standard Windows 98 (or NT) desktop,
(b) the Windows 2000 "Workstation" desktop,
(c) the Windows XP "Home" desktop.
Although the latter two operating systems share the same 3D view in the same window, they support different functionalities in a 3D view. AutoCAD 2008 includes the ability to draw in 2D views from the 3D perspective.
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In Windows, AutoCAD allows to generate AutoLISP source code. This code can be compiled and run on any system that supports AutoCAD. AutoLISP can be used for such purposes as creating macros for the drawing program, and for editing and designing documents within AutoCAD.
In Windows, AutoCAD also allows to create macros or macros-like scripts in Visual LISP. This is a special kind of AutoLISP, with an additional GUI, that helps to design drawings and documents.
AutoCAD also allows to create macros or macros-like scripts in Visual Basic for Applications. These are Microsoft Visual Basic scripts that run on Windows operating systems and allow a wide range of AutoCAD tasks. Visual Basic for Applications is the name given to VBA.
 Mac OS X includes a version of AutoCAD called "Académie", which is a generic term for the built-in AutoCAD application for the Mac OS X operating system.
Language features
Autodesk's use of the LISP dialect of the LISP programming language is called "AutoLISP" and this is described in the AutoLISP language reference. AutoLISP supports the following types of LISP statements and syntax:
 Macro definitions: for defining new macros for use in AutoLISP code.
 Macros: for adding/modifying existing LISP code.
 Scripts: for creating new code for use in AutoLISP.
 Closures: for creating functions and scripts.
 General: for adding some features for handling files, memory, strings, lists, etc.
AutoLISP code executes as follows:
 It is saved as a file by using a special command.
 It is executed in the AutoCAD application.
 AutoLISP statements are transformed into AutoCAD commands.
 The transformation is done by using a LISP interpreter.
AutoLISP code can be saved and later loaded into AutoCAD.
One way to create AutoLISP scripts is to use the Command Shell's macro command to add AutoLISP code. This allows the programmer to write code in LISP syntax that will create a standard AutoLISP file.
AutoLISP code can be saved and later loaded into AutoCAD.
Custom LISP (CL) compiler
AutoCAD also includes a custom LIS
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