Autodesk AUTOSKETCH 8, User Manual

Page: 263 / 400

Using the Selection Modifier
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There are four logical operators:
Enclosing part of the selection statement in parentheses causes AutoSketch
to evaluate that portion before the parts that are outside the parentheses. For
example, the following statement selects all entities on the Electrical layer
that are either red or blue:
Layer=’Electrical’ AND (Color =’Red’ OR Color=’Blue’)
Changing the parentheses in a selection statement can dramatically change
which entities are selected. The following statement uses the same qualifiers
and operators as the previous statement, but selects all entities that are either
on the Electrical layer and are red, or all entities that are blue:
(Layer=’Electrical’ AND Color=’Red’) OR Color=’Blue’
Once you create a selection statement, you can choose to add the entities it
describes to the selection set or subtract them. For the duration of the current
drawing session, the Selection Modifier retains the last selection statement
for each open drawing. At any point, you can clear the selection statement
and start over, or you can cancel the Selection Modifier entirely.
To add a qualifier that selects all entities
1 On the Edit menu, click Select, Modify Selection, or click the Modify
Selection button on the All-In-One toolbar.
2 On the Selection Modifier menu bar, click Qualifier, All. The word ALL is
added to the selection statement.
Logical operators used in selection statements
Operator Description
AND Connects two qualifiers. Entities that meet the criteria of both qualifiers
are selected.
OR Connects two qualifiers. Entities that meet the criteria of either qualifier
are selected.
NOT Precedes a qualifier and reverses its meaning. Only entities that do not
meet the criteria are selected.
BUT Connects two qualifiers with AND NOT. Entities that meet the criteria
of the first qualifier but not the second are selected.