Autodesk AUTOCAD 2010 - PREVIEW GUIDE User's Guide Page 380

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366 Chapter 5: Altering Objects
Guidelines for Trim and Extend
Consider the following guidelines when using the Trim and Extend commands:
Cutting or boundary edges may be lines, arcs, circles, polylines, ellipses, splines, xlines, regions,
blocks, text, and rays.
If you do not specify a cutting or boundary edge and press ENTER instead at the Select Objects
prompt, all objects become potential cutting edges or boundaries. This is called implied selection.
If you hold down the SHIFT key, you can SHIFT + select to switch between Trim and Extend. For
example, if you are in the Trim command, you can hold down SHIFT and select objects to be
extended to the boundary edge. Similarly, you can be in the Extend command and use SHIFT +
select to trim objects to a cutting edge.
Cutting and boundary edges do not have to intersect the object being trimmed or extended if you
use the Edge option set in the Extend mode. With this setting, you can trim or extend an object
to where it would intersect if the cutting or boundary edges were extended. For example, in the
following illustration, the lower line (2) in the left illustration can be extended as if line (1) really
was extended to point (3) as shown in the illustration on the right.
Extended Edge Mode
Guidelines for Trim and Extend Options
The default edge mode for Trim and Extend is No Extend. Most of the time, you will want to use
these commands with this default setting.
The Trim or Extend Project option is for 3D.
The Trim or Extend eRase option enables you to erase line segments within either of these
commands.
The Trim or Extend Undo option enables you to reverse an action you have made to trim or extend
without exiting either of these commands.
Note: You can right-click to select these options from the shortcut menu or you can type the
capitalized letter of the option at the Command line and press Enter.
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