2021 | Autocad

Diving Into AutoCAD 2021: Fundamentals and Key Features Released by Autodesk, AutoCAD 2021 remains a staple for professionals in architecture and engineering due to its robust toolset for 2D drafting and 3D modeling. This version introduced several refinements to workflows, particularly in how users interact with external data and manage drawing precision. Core Functionality and Interface

Q: Are the file formats different from AutoCAD 2020? A: No. AutoCAD 2021 uses the same DWG file format as 2020, 2019, and 2018. Files are fully compatible with those versions without the need for conversion. AutoCAD 2021

4. Customization & extensibility

• ObjectARX (C++): native SDK to create custom entities, reactors, and database extensions. Key patterns: extend AcDbEntity, implement worldDraw/viewportDraw, and register ARX commands. Compile against matching ObjectARX version for binary compatibility.
• .NET API (managed): Autodesk.AutoCAD.DatabaseServices, ApplicationServices, EditorInput, Runtime, and Windows.Forms interop. Use DocumentLock when modifying documents on non-UI threads; transactions via TransactionManager.
• AutoLISP & Visual LISP: quick scripting, access to ActiveX/COM and VLISP extensions. For complex UI and performance, prefer .NET/ObjectARX.
• APIs: Commands can be added via CommandMethod (.NET) or ARX command macros. Use DBObject’s XData/XRecords for attaching custom metadata; for robust storage prefer extension dictionaries and DxfRecords.

Improved Design Quality: With its extensive library of tools and features, AutoCAD 2021 empowers users to create detailed, precise designs that meet the highest standards of quality. Diving Into AutoCAD 2021: Fundamentals and Key Features