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AutoCAD is aimed at the professional market, and currently the most-used commercial CAD program by both architects and engineers. Although similar in concept to Freehand (see below), AutoCAD was designed from the ground up to be a true CAD program, and is not merely a digital version of traditional drafting techniques.
AutoCAD's most basic function is the design of two-dimensional (2D) objects such as houses, cars, and circuit boards. The objects can be outlined, filled, and then moved, rotated, and scaled. They can be annotated with predefined blocks, which are geometric shapes, text strings, dimensions, and mechanical attributes, such as material properties, drill points, and edge creases. In practice, most designs are created and edited with a combination of blocks, drawing views, and a set of tools. These tools provide common drafting functions such as extrusion, section, and hatch. More specialized tools, such as building information modeling (BIM) and engineering functionality, are not part of the base software. AutoCAD also supports three-dimensional (3D) models, which can be linked to 2D objects. AutoCAD's functionality is complemented by a number of technical and user tools. Its drawing standard is DWG (drawing), and the format for 2D and 3D files is DXF (drawing exchange format).
Designs are stored in a native format, which is independent of the design software used to create them. The native format is similar to DWG, but includes a distinct set of file formats, including DXF, PDF, DWF, DGN, and others, which are used to format data, annotate objects, and export or embed data. File names and file structures are completely independent of design software, and are therefore not limited to a DWG–like format. AutoCAD can read and write all of these formats. Other file formats, such as VRML and DGN, are proprietary and used by other design software.
Through the use of the AutoCAD Productivity Center (ACC), other programs can work with AutoCAD drawings. Various applications can be bundled together, and use the AutoCAD drawing formats. For example, the Office Suite includes the Word and Excel programs, which both use the.doc and.xls file formats. AutoCAD can also export design drawings to AutoCAD X, which are more capable than the original design file. This enables AutoC
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The AutoLISP API, introduced in AutoCAD Download With Full Crack 2000, was the first native and cross-platform programming language for AutoCAD.  Visual LISP, and now AutoLISP, is more popular and accessible than the previous Visual LISP. In contrast, VBA is available on most operating systems, but not directly accessible in AutoCAD. VBA is primarily a tool for spreadsheet programs (such as Microsoft Excel) and a macro scripting language (designed for programming a keyboard or mouse) but is more widely used and accessible than AutoLISP. With the introduction of AutoLISP v2.0 in AutoCAD R13 and the establishment of a more robust development environment, Visual LISP can now be used with AutoCAD as an integrated language within AutoCAD. AutoLISP is the most popular user interface language for AutoCAD.  AutoLISP provides the highest level of functionality to allow user interactions with a program.  Most recent additions to AutoLISP have been made with an emphasis on standardizing and minimizing the language's deficiencies.
The ObjectARX programming API was introduced in AutoCAD R15 and has been included in AutoCAD since then. This API supports the implementation of C++ libraries through DirectAIK. AutoCAD was built from the ground up to be compatible with Microsoft Windows, and now runs on both 32-bit and 64-bit Windows.  AutoCAD R15 also added the concept of "Preference Packs" (AutoCAD.PreferencePacks). The objects defined in a preference pack are loaded at start up, meaning that the user does not have to re-load them each time they use the program.  This concept greatly reduces the number of times objects have to be reloaded when a preference pack is updated.
The ObjectARX development environment includes a plugin architecture for writing AutoCAD extensions. AutoCAD's open-source community project ListARX allows extension of Autodesk's list (or table) objects with customizable table properties. ListARX uses ListARX-Autodesk libraries to define the table properties.
In addition, AutoCAD has a free and open-source development platform named Eclipse, which is used for developing extensions, tools, and applications. Eclipse includes the AutoCAD Toolbox, which provides a set of reusable items for AutoCAD to handle AutoCAD development.
To facilitate interoperability between other
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