Graphics Programs Reference
In-Depth Information
2.
Enter
@-3,0
↵. Metric users should enter
@ -9,0
↵. This distance is also in X,Y values, but
here you use a negative value to specify the X distance. The result is a drawing that looks
like Figure 2.8.
FIGURE 2.8
These three sides
of the door were
drawn by using the
Line tool. Points
are specified by
using either rela-
tive Cartesian or
polar coordinates.
Rubber-banding line
Positive values in the Cartesian coordinate system are from left to right and from bottom to
top (see Figure 2.9). (You may remember this from your high school geometry class!) If you
want to draw a line from right to left, you must designate a negative value. It's also helpful
to know where the origin of the drawing lies. In a new drawing, the origin—or coordinate
0,0—is in the lower-left corner of the drawing.
FIGURE 2.9
Positive and
negative
Cartesian
coordinate
directions
Coordinate 5, 4
The AutoCAD drawing area
in a new file (approximate)
Origin O, O
Coordinate -5, -4
3.
Type
C
↵. This
C
stands for the Close option. It closes a sequence of line segments. A line
connecting the first and last points of a sequence of lines is drawn (see Figure 2.10), and
the Line command terminates. The rubber-banding line also disappears, telling you that
