Topic: Autodesk
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AutoCAD 2D Tutorial: Draw Commands
AutoCAD provides the user with an infinite two dimensional area to work
with. Any entities place on the working two dimensional plane can be
defined relative to the Cartesian coordinate system. ...
The Cartesian coordinate system divides a two dimensional plane with two
perpendicular axis. The X axis runs horizontal across the bottom of the
screen. The Y axis runs vertically along the left side of the screen. These
two axis intersect at the bottom left corner of the screen.
Each of these axis is further divided into segments. Each segment is given
a value. The X axis segments increase in value to the right. The positive X
values are to the right of the intersection of the two axis. The negative X
values are to the left. The positive Y values are above the intersection
and increase up. The negative Y values are below.
Aliases are shortcuts or alternative names for commands that you enter at
the keyboard. They are stored in a file called ACAD.PGP and are often
(but not always) the first letter of the AutoCAD command. For example,
copy is CO or CP because C is already used by the Circle command.
...
Source: fetweb.ju.edu.jo
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