Since its release, AutoCAD has remained a popular CAD program. The latest version (v2019), released on May 6, 2019, has the third highest overall rating on the Mac App Store for a general-purpose CAD application, and AutoCAD is one of the best-selling Mac apps overall.
There are over 500 add-ons for AutoCAD, such as plugins, styles, buttons, templates, decals, and specialty tools. Autodesk also offers an annual subscription to AutoCAD Extended that adds new features, with all updates usually appearing within two months of the initial release.
AutoCAD is one of the best applications in its category.
AutoCAD is a commercial CAD program intended for the creation of drawings, and has three main functions:
Creating 2D drawings, such as plans, views, and sections
Creating 3D models and animations
Importing and exporting data from other CAD applications
Before AutoCAD, most commercial CAD applications ran on mainframe computers or minicomputers. AutoCAD was developed as a desktop app running on microcomputers with internal graphics controllers. The objective of this approach was to allow multiple users to share the same workspace and easily switch back and forth between different types of drawings.
However, as a result of the simplicity of working in 2D, CAD had a steep learning curve and was very time consuming, and the production rate of projects was often slow.
The introduction of AutoCAD in 1983 was a breakthrough, as the design process changed drastically. In this approach, 3D models are built from 2D drafting components that are then edited and converted to other types of drawings. This approach removes the time lag that is usually associated with traditional CAD workflows, and a single user can work at several different levels at the same time, from working out the design in 2D, to creating 3D models, and then to working out the engineering details.
On AutoCAD’s original introduction, it was released as a classic desktop application that ran on a personal computer with a 24-bit color graphics display, and it was available only as a serial or terminal product. The growth of AutoCAD’s popularity as a desktop CAD program led to the release of AutoCAD LT, which was first released in 1987 as an «easy-to-learn» version of AutoCAD, and was then extended to other operating systems, including Mac
User-defined scripts (UDS) are used for customization and automation. They are written using AutoLISP, Visual LISP, or a visual scripting language called Freehand.
AutoCAD can read files in other formats such as BMP, CAD, GIF, JPEG, ICO, PNG, TIFF, JPEG, PDF and SVG.
In addition to the current version of AutoCAD, there are other AutoCAD versions: AutoCAD 2000, AutoCAD 2002, AutoCAD 2007, AutoCAD 2010, AutoCAD 2011, AutoCAD LT, AutoCAD 2013 and AutoCAD 2015
AutoCAD is one of the main development and application tools used by companies to perform computer aided design.
AutoCAD supports customization and automation using AutoLISP, Visual LISP, Visual Basic for Applications (VBA),.NET, or ObjectARX. Scripts written in those languages can access AutoCAD’s API. The interfaces for.NET and VBA are language independent, whereas the interfaces for AutoLISP and Visual LISP are language specific.
AutoLISP is a visual programming language for developing computerized applications using the AutoCAD drawing program. AutoLISP scripts are written in AutoLISP, and must be compiled before they can be executed. AutoLISP can access a number of AutoCAD’s functions, such as DYMNET, DYMREAD, DYMWRITE, DYMSET, DYMSET, DYMREAD and DYMWRITE.
AutoLISP scripts can access the following AutoCAD functions:
Open Autocad and make sure that you have the latest update.
Open the Autocad application (start -> program -> Autocad) and select **File** -> **Save** and type a file name and save it.
Now go to the [Autocad > Legacy] folder under the [program] folder. This is where Autocad generates the file and stores it. Now copy the file to where you saved the *.accdr file.
Do this for both *.accdr and *.acddr files.
Sometimes if you are copying the file, you will get a message saying that there is an error in the *.accdr file, click on **OK**.
Now when you start Autocad from the legacy folder you can see the *.accdr and *.acddr files.
If you want to use *.accdr instead of *.acddr click on **File** -> **Open** -> **File** and browse for the *.accdr file.
**注意**：本文主要介绍 Poseidon 自定义计算时间格式，请看 [Kafka上的Poseidon实现](../Poseidon-kafka/java/README.md)
Kafka（信息交换协议）的实际实现也包含了自定义计算时间格式的功能，但是在文档上提及的时间格式和 Kafka 中的时间格式不兼容，仅限于提及，并非进行了详细介绍。
Markup Assist will import and help you complete markup blocks by adding segments, thickenings, annotations, and dimension lines to your drawings. You can export a completed drawing to a 2D PDF. (video: 1:39 min.)
Complete the job faster with enhanced assistance. Find what you’re looking for in one place. Instantly get to the drawing information you need with new and improved command shortcuts. (video: 1:48 min.)
In addition to support for drafting in all three axis directions (X, Y and Z), the new AutoCAD software includes additions and improvements for 2D drafting as well as new and improved functionality for 3D drafting and 3D modeling.
In AutoCAD, you can now simulate 3D space views. You can also use 2D drafting tools to create 3D surfaces, analyze and compare drawings, and more.
View Space tool improvements include the ability to select more objects, and to toggle between view space and plot space using the Selection icon on the status bar. You can also use the New Point feature, which lets you create new points anywhere on the model by holding down the Ctrl key, and then clicking. The AutoFit feature lets you create circular splines for cutting and creating curved surfaces. The command Edit Surface Allows you to edit and modify the surface of an existing 3D model. The Edit Surface feature is now available for 3D models only.
Use new and improved commands. The functionality of new and existing commands has been expanded and refined. In addition to improved usability, there are also enhancements to the functionality of some of the most used commands. A new Feature View command lets you visualize the location of features in 3D, and a new Editor command lets you create 3D structures and edit their appearance.
AutoCAD for 2D drafting supports Drafting Profiles and can be used to:
Create line and polygon features in the x- and y-axis direction (X, Y) in 2D space. You can also add points to a 2D drawing, and create circular splines by holding down the Ctrl key and clicking.
Freeze and edit a 2D drawing. You can freeze selected drawing objects, and then edit them as one drawing element. This is particularly helpful for drawing and editing a 2D profile from a 2D drawing. You can use the 2D drawing tools to edit all objects in the drawing at the same time, or select specific objects
OS: Windows XP/ Vista
CPU: Intel Pentium III 700 Mhz, 1 GHz or AMD Athlon XP, 1.5 GHz or better
RAM: 512 MB or more
DirectX: Version 9.0
Hard Drive: 800 MB free disk space
Video: NVIDIA GeForce 3 or better, ATI Radeon 7000 or better, Intel Integrated GMA 950 or better
Other: VGA compatible video card or better
Sound Card: Soundblaster compatible
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