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AutoCAD and Its Applications—Basics
Copyright Goodheart-Willcox Co., Inc.
NOTE NOTE
Use the
eRase
option of the
TRIM
command to erase unwanted
objects, usually objects that cannot be trimmed. Use the
Undo
option
to restore previously trimmed objects without leaving the command.
You must activate the
Undo
option immediately after performing an
unwanted trim. The
Project
option applies to trimming 3D objects, as
explained in AutoCAD and Its Applications—Advanced.
Extending Extending
Use the
EXTEND
command to extend lines, elliptical arcs, rays, open polylines, arcs,
and splines to meet other objects. You cannot extend a closed object because an uncon-
nected endpoint does not exist. Access the
EXTEND
command, pick as many boundary
edges as necessary, and then press [Enter]. Now pick the objects to extend to the boundary
edges. Preview the operation before extending. To exit, press [Enter]. See Figure 11-20.
Automatic windowing is a quick and effective method for extending multiple
objects. The
EXTEND
command also offers
Crossing
and
Fence
options that provide
standard crossing and fence selection. Figure 11-21 shows using the
Crossing
option
to extend multiple objects. Figure 11-22 shows an example of using the
Fence
option
to extend multiple objects.
Extending without Selecting a Boundary Edge
To extend objects to the nearest intersection without selecting a boundary edge,
access the
EXTEND
command and, at the
Select objects or select all:
prompt, press
[Enter]
instead of picking a boundary edge. Then pick the objects to extend. You can
continue selecting objects to extend without restarting the
EXTEND
command. To exit,
press [Enter].
boundary edge:
The edge to which
objects such as
lines, arcs, and
polylines extend.
EXTEND
Ribbon
Home
Modify
Extend
Type
EXTEND
EX
NEW
Figure 11-20.
Using the
EXTEND
command. Note the
boundary edge.
Select the
boundary edge
Select the object
to extend
Step 1 Step 2 Result
Figure 11-21.
Selecting objects to extend using the
Crossing
option. Automatic windowing accomplishes
the same task.
Crossing box
Process Result
Selected boundary edge (rectangle)