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AutoCAD Architecture
The AutoCAD application consists of four core layers: Core, Interface, DataBase, and Utilities. The Core Layer consists of the software logic and data structures that provide the AutoCAD user interface, viewing, and drawing capabilities. The Interface Layer supports the user interface by providing a set of windows, menus, and dialog boxes, and by applying standard window formatting such as title bars, border lines, and color. The DataBase Layer supports the database interface and provides a set of tools that interact with and manipulate the database. The Utilities Layer provides support for the user interface by providing additional features and tools to help the user perform specific tasks.
Views and windows, layers and blocks
In AutoCAD, the Core Layer includes three views: Graphical, Drafting, and Annotation. The Drafting view supports standard design conventions for drawing shapes and blocks, plus adds AutoCAD functionality for setting features, annotating, and working with sections. The Graphical view contains standard commands for creating new drawings, adding or modifying blocks, and performing a variety of other editing tasks. The Annotation view displays text and numbers, showing a two-dimensional drawing as a composition of text, text boxes, drawings, and annotations.
The Interface Layer contains six main windows: the Window (Core), the Dynamic Input (Core), the Drafting (Core), the Block List (Core), the Drawing (Core), and the Snap (Core). The Window displays graphics, text, or annotations that allow the user to interact with the application. The Dynamic Input window contains commands, such as dialog boxes, that provide additional user options or allow additional tasks to be performed. The Drafting window supports standard geometric design conventions by showing a 2D drawing as a set of shapes. The Block List window displays the named objects in the drawing, enabling the user to change or modify them. The Drawing window provides an overall graphic view of the drawing. The Snap window shows the user's current view of the drawing and allows the user to switch to another view, or switch to a different part of the drawing.
The Utilities Layer includes two main toolsets: Blocks and Properties. The Block Set contains ready-to-use geometric design elements, such as circles, rectangles, and arcs, as well as design primitives that are made up of multiple shapes, such as compound curves and surfaces. The Properties toolset provides properties to help the user assign
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