Chapter 6 Basic Geometric Constructions 189
Duplicate a
Plane Figure
with Irregular Curves
CAD
Using Reference Points
(Manual Procedure)
1. The plane fi gure to be duplicated is fi
given, Figure 6-39A.
2. Draw a rectangle to enclose the plane
figure. fi
3. Select points on the irregular curve that
locate strategic points or changes in
direction and draw lines connecting the
points, Figure 6-39B.
4. Reproduce the rectangle and reference
points in the new position. Draw the
straight lines and irregular curves
between the reference points,
Figure 6-39C.
Figure 6-39. Using reference points and lines to duplicate a plane fi gure with an irregular curve.
A B C
Using the Copy Command
(CAD Procedure)
A plane figure with irregular curves can fi
be copied to a new location by using the
Copy
command. You can copy the entire fi gure or fi
one of the individual curves making up the
figure. Refer to fi Figure 6-39A. After entering
the command, select the objects to copy,
select a base point, and specify a second
point. As is the case with other editing com-
mands, the
Copy
command provides several
ways to select objects for the operation. For
example, if you are copying lines or curves
from a complex object, you may want to use
a window, fence line, or polygon outline
to select the individual objects to copy. A
selection option is normally entered prior to
selecting objects.