Autodesk AUTOSKETCH 8, Руководство пользователя

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Chapter 23 Trimming Entities
5 Enter a point to specify the depth of the alcove.
Joining Entities
You can join several entities into a single poly-entity. For example, if your
drawing contains two polylines that share a common endpoint, you can join
them to form a single polyline. Once you have joined them, you can select,
move, or edit the entity as a single entity rather than having to perform the
same tasks on multiple entities. Joining entities also reduces the redraw time
and decreases the size of the drawing file.
In AutoSketch you can join any line, polyline, or arc to any other line,
polyline, or arc if the two entities share an endpoint. You can also join a series
of lines, polylines, or arcs together if each entity shares an endpoint with the
next entity. If the entities do not share an endpoint, you must trim them to
a corner before you join them. For information on trimming entities to a
corner, refer to page 286.
Pressing CTRL while joining entities causes AutoSketch to join all the entities
in a series, until it encounters an ambiguous intersection with another entity.
AutoSketch searches both directions from the point you enter, and continues
until it finds an ambiguous intersection in both directions.