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AutoCAD has since evolved into a comprehensive vector graphics design tool, and is available for both PCs and Macs. It is designed to provide comprehensive features for 2D drafting, 2D and 3D modeling, 2D annotation, 2D and 3D rendering, and support for specialized 2D and 3D file formats. It includes many of the features found in other Autodesk products, such as 2D and 3D graphic and mechanical design, data management, engineering, architectural and information visualization, and animation. The software is now used throughout the engineering, manufacturing, construction, and architectural industries.
AutoCAD has become the dominant CAD program in the industry, and is the most popular commercial CAD program, with market share of roughly 50%. Autodesk’s revenue from AutoCAD has been estimated at approximately $4.8 billion per year as of 2014. AutoCAD’s market share has grown rapidly since its introduction, from a roughly 1% share in 1985 to a more than 50% share in 2014.
From a programming standpoint, AutoCAD is primarily written in C++, with less than 5% of the source code written in C. It is one of Autodesk’s proprietary programming languages, and is not related to any industry standard language. AutoCAD’s code is distributed as a header file, with the rest of the code stored in a proprietary binary format called Dynamic Link Libraries (DLLs). AutoCAD’s functionality is implemented as an object-oriented programming (OOP) system.
This article explains the basic concepts of programming with AutoCAD using the C++ programming language.
What is C++ programming language?
C++ is a general purpose programming language developed by Bjarne Stroustrup and produced and maintained by the University of Wisconsin-Madison. The language design philosophy was one of concurrency, safety, and efficiency. The language’s syntax is designed to be as similar as possible to C, while being more powerful. C++ evolved from the C programming language, which was developed in 1979.
The C++ language is used for programming application, libraries, and operating system services. C++ code can be compiled to generate executables, as well as run in an interpreted mode. C++ is generally used for high-level programming, whereas C is used for low-level programming.
C++ features such as
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Windows version
On December 4, 2019, Autodesk announced that Autodesk AutoCAD 2018 for Windows will be the last major release of the 32-bit version of AutoCAD. All future releases of AutoCAD will be for 64-bit and are natively supported on Windows.
File formats
The original file formats for AutoCAD were the design and drafting file format DGN and the CAD drawing file format DWG. They are now proprietary and restricted formats that can only be read by the AutoCAD program. In a move by Autodesk in the 1990s to facilitate sharing designs among designers, the format was changed to the native AutoCAD format DXF. In 2002, this design was changed to the native drawing exchange format DWG and the two are commonly referred to as DXF and DWG.
The native file formats of AutoCAD are now either the native drawing exchange format DWG or the native format DXF. There is also a format for exporting to the VectorWorks rendering system, VE, which is referred to as VE format. DWG files are still supported for import to AutoCAD, but are no longer valid for export. DXF files are valid for both export and import.
Autodesk released the R14 file format in 2007, but discontinued it in 2011. R13 had only one real benefit over R14, which is that it could handle larger files, since it didn't rely on fixed-size fields for its variable-sized features. However, R13 had many other problems, such as file corruption from a failed action, an undesirable lag in drawing performance, a perception that it was unreliable, and an inability to import large objects. R14 was improved in a number of areas, including better responsiveness to mouse clicks, support for large files, and the ability to import some of the geometry from R13 models. However, it was often missing important data, and did not provide an option to import the data of an R13 file into an R14 model. Autodesk has stated that the support for R14 was discontinued due to users not taking advantage of the improved functionality.
AutoCAD applications and services
There are many third-party applications and services that provide editing and rendering capability. AutoLISP, Visual LISP, VBA,.NET and ObjectARX are commonly used for customization and automation.
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