Auto CAD
14 May 2008AutoCAD is the world’s most popular computer-aided drafting software product for the personal computer available in both DOS and windows by Autodesk, Inc. Anything that can be drawn on a drawing board can be drawn by AutoCAD.
AutoCAD is an interactive drawing system designed to permit a user to construct or edit a drawing on a graphics display screen. It is similar to other word-processing programs except that in this case the thing being processed is a drawing. Each drawing is stored on a disk file, and AutoCAD is only able to edit one drawing at a time. An AutoCAD drawing is made up of entities. All the objects in the drawing space are considered entities such as lines, arcs, circles, text, and so on or blocks (which are groups of entities). The entities are defined geometrically in terms of the normal Cartesian coordinate system (right-handed system with positive X-axis to the right, positive Y-axis up the screen and positive Z-axis coming out of the screen towards the user). For example, lines are defined by their end- point coordinates (x, y and z), while circles are defined by their center coordinates and radius. Each entity also has certain attributes associated with it, such as line style, text font or color.
AutoCAD organizes information in different layers like other programs like Photoshop and Illustrator. This means that any drawing entity can be assigned to any layer of the drawing. This allows separation of portions of the drawing. For example, all parcels could be assigned to one layer and all footprints to another, and so on. This allows plotting selected layers in the drawing.
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