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AutoCAD Architecture
AutoCAD consists of two primary applications: the command line and the graphic user interface (GUI). The command line is available on all AutoCAD platforms and is where all of the commands are accessed and executed. It is possible to place a command on the command line directly by typing the command into the command window. A command window, shown in Figure 1, enables the user to enter commands and parameters and to see the results.
Figure 1. Command Window
The graphic user interface (GUI) is an interactive display that enables the user to make selections and changes to drawings, lay out plans, and configure various functions. The GUI is designed to make drawing easy, and is used by most AutoCAD users. It includes a number of tools and windows, which enable the user to select, draw, and edit objects in a CAD document.
Figure 2. AutoCAD Design View
Entering AutoCAD commands
The AutoCAD command line consists of one or more command entry boxes, which are always available to the user. Commands are entered in a command line window. Commands entered in the command line are preceded by a set of command parameters. For example, the command setp 10,20 50 would enable a user to place a line through the point 10,20 on the screen.
The AutoCAD command line includes a number of command parameters. These parameters provide instructions to AutoCAD that help the user in completing commands. For example, when a line command is given without a line name, the AutoCAD command line includes two line names that are automatically supplied. The parameters include:
Line_name=
No Line_name=
Line_name_1=
Line_name_2=
No_Line_name=
Origin_point=
Destination_point=
No_origin_point=
No_destination_point=
Figure 3. Line Commands
A user interface window, called a command window, appears as a separate window when the user enters a command on the command line. The command window is used to enter parameters, view the results of the command, and control various aspects of the command. A command window includes two windows, called the Command bar and the Command Edit bar.
The Command bar is where the user enters parameters that are not in a normal parameter list format. For example
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The types and semantics of the AutoCAD Product Key data models is important to the design of an application. The Drawing data model is a hierarchical and self-describing data model for a CAD drawing file. The DFM also includes textual and binary data.
The Drawing data model defines the ways in which attributes and classes are defined in a drawing, including: properties, classes, templates, component types, and views.
The Drawing data model is designed to support the generation of usable code based on the DFM. The DFM can also be used directly to generate executable code. There is code generation for Python, Visual Basic, and other languages that can be implemented.
Classes
The Drawing data model is based on an object-oriented design. It uses classes, or class structures, to allow reuse of common groups of properties and methods. There are many classes:
Document and drawing classes are organized into a hierarchy.
Classes of objects with a specific type include:
A component, for example, an arc or line
An attribute, which is a property or attribute of a component, for example:
If the object is an arc, then the position, rotation and arc type properties are attributes of the arc object
A clip object, which is a collection of shapes
A clipping group, which is a collection of clipping objects
A drawing, which is a document
A template, which is a default version of a component or drawing
In the following example, the method drawlines is a property of the Arc class that adds a set of line objects to the drawing.
A template object is a default drawing or component version that is stored in a drawing and is included in every copy of that drawing.
Visual LISP API
AutoCAD supports two programming languages:
AutoLISP, which is an AutoCAD extension language
Visual LISP, which is a Visual Basic-based language
AutoLISP has two forms, one called "AutoLISP 2" and the other called "AutoLISP 1". The AutoLISP 1 is mainly an editing and drawing language. The AutoLISP 2 (also known as "AutoLISP/1.1", "AutoLISP/1.11" or "AutoLISP/2") has many of the capabilities of AutoLISP 2 as well as several enhancements. AutoLISP 1 and AutoLISP 2
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