2012

reflection line. Objects can be flipped about this reflection line. A flip parameter
displays a value that shows if the block reference has been flipped or not.
Visibility Parameter (BPARAMETER) Adds a visibility parameter to the
dynamic block definition and defines a custom visibility property for the block
reference. With visibility parameter, you can create visibility states and control
the visibility of objects in the block. A visibility parameter always applies to
the entire block and needs no action associated with it. In a drawing, you
click the grip to display a list of visibility states available for the block reference.
In the Block Editor, a visibility parameter displays as text with an associated
grip.
Lookup Parameter (BPARAMETER) Adds a lookup parameter to the dynamic
block definition and defines custom lookup properties for the block reference.
A lookup parameter defines a custom property that you can specify or set to
evaluate to a value from a list or table you define. It can be associated with a
single lookup grip. In the block reference, you click the grip to display a list
of available values. In the Block Editor, a lookup parameter displays as text.
Base Point Parameter (BPARAMETER) Adds a base point parameter to the
dynamic block definition. A base point parameter defines a base point for the
dynamic block reference relative to the geometry in the block. A base point
parameter cannot be associated with any actions, but can belong to an action's
selection set. In the Block Editor, a base point parameter displays as a circle
with crosshairs
Actions Tab (Block Authoring Palettes Window)
Provides tools for adding actions to a dynamic block definition in the Block
Editor. Actions define how the geometry of a dynamic block reference move
or change when the custom properties of a block reference are manipulated
in a drawing. You associate actions with parameters.
Move Action (BACTIONTOOL) Adds a move action to the dynamic block
definition when you associate the action with a point, linear, polar, or XY
parameter. A move action is similar to the MOVE command. In a dynamic
block reference, a move action causes objects to move a specified distance and
angle.
Scale Action (BACTIONTOOL) Adds a scale action to the dynamic block
definition when you associate the action with a linear, polar, or XY parameter.
A scale action is similar to the SCALE command. In a dynamic block reference,
a scale action causes its selection set to scale when the associated parameter
is edited by moving grips or by using the Properties palette.
242 | Chapter 3 B Commands