ADG：自动绘图生成库
ADG基于著名的Cairo矢量图形库，因此能提供质量非常好的2D图形渲染。ADG使用了GObject来提供面向对象机制，并具备Model-View概念，具备很强的定制能力。
软件开发者可以利用ADG来开发出一款具备工业级标准的平面设计软件，当然因为这套库还在开发当中，还不能与已有的CAD系统相比。
The ADG library (Automatic Drawing Generation) is a set of functions focused on automating the drawing of mechanical parts.
It is not a CAD system but a library providing a non-interactive canvas where you can put common CAD entities such as paths, xatches and quotes, to create your technical drawings.
If you want to develop an application that needs to show and print drawings, also complex, where some data change but the overall design is ever the same the ADG library comes in handy. In production factories, this is often a good choice and could help to greatly improve the production in technical offices.
You can reach similar targets using parametric CADs but a custom application provides the following benefits:
- more customizable
if you have to create an application from ground, you can do whatever you want; - not so bloated as a parametric CAD
this honestly depends on your application but, talking in general, ADG doesn't have a lot of stuff a CAD system must have; - can be easily connected to a database
the model-view separation greatly improves the ADG connectivity; - the drawings could be generated on-fly
no needs for user interaction: this feature can be used in a dynamic site throught a web-based application.
This library is developed in C using an object-oriented approach. It is primarily focused on GNU/Linux systems, but a porting to other environments should be easy (if not automatic): all the underlying libraries are known to run on Windows and OSX (at least).
As yet stated, the ADG uses the model-view concept: this helps the data source connection because, whenever you need to change the current part you want to see/check/print, it suffices to change the data inside the model.
