Introducing drawing - Introduction to AutoCAD 2011: 2D and 3D Design - page 33

@130,0

@0,20 @0,20

60,210

@50,0 @50,0

c (Close) @0,105

@50,0 @50,0

@0,20 @0,20

@130,0

Fig. 2.7 Third example - Line tool

N o t e s

1. The fi gures typed at the keyboard determining the corners of the
outlines in the above examples are two-dimensional (2D) x,y
coordinate points. When working in 2D, coordinates are expressed in
terms of two numbers separated by a comma.

2. Coordinate points can be shown in positive or negative numbers.

3. The method of constructing an outline as shown in the fi rst two
examples above is known as the absolute coordinate entry method,
where the x,y coordinates of each corner of the outlines are entered
at the command line as required.

4. The method of constructing an outline as in the third example is
known as the relative coordinate entry method - coordinate points
are entered relative to the previous entry. In relative coordinate entry,
the @ symbol is entered before each set of coordinates with the
following rules in mind:

ve x entry is to the right.

v e x entry is to the left.

ve y entry is upwards.

ve y entry is downwards.

5. The next example (the fourth) shows how lines at angles can
be drawn taking advantage of the relative coordinate entry
method. Angles in AutoCAD are measured in 360 degrees in a