INTRODUCTION
TO AUTOCAD
AutoCAD allows you to have access to a large number of
commands. A general rule is that you will use 20% of the commands 80% of the
time.
The important thing to remember is that AutoCAD will
expect you give it information in a very particular order. The most frustrating
thing when you begin using this program is that you will try to do something,
but AutoCAD will 'not work'. In most cases, it means that you are trying to
input information at the wrong time. This is why it is very important to be in the habit of looking at the
command line.
AutoCAD uses points to determine where an
object is located. There is an origin where it begins counting from. This point
is (0,0). Every object is located in relation to the origin. If you were to draw
a line straight out to the right from the origin, this would be considered the
positive X-axis. If you were to draw a line straight up, this would be the
positive Y-axis. The picture above shows a point located at (9,6). This means
that the point is 9 units over in the X-axis and 6 units up in the Y-axis. When
you are working with points, X always comes first. The other point shown is
(-10,-4). This means that the point is 10 units in the negative X-axis (left)
and 4 units in the negative Y-axis (down).
A line has two points, a start point and an
end point. AutoCAD works with the points to display the line on the screen.
Move your cursor over the picture above and you will see line drawn from the absolute points
of (-10,-4) to (9,6).
Most of the time we will not have an
indication of where the origin is. You may need to draw a line from the
endpoint of an existing line. To do this you use relative points.
These work the same way, but you have to add the@ symbol
(shift+2) to tell AutoCAD that this next point is relative from the last point
entered.
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