2011

There are two general types of constraints supported: Geometric and
Dimensional.
■ Geometric constraints determine the relationships between 2D geometric
objects or points on objects relative to each other.
Use constraint bars to view the geometric constraints applied to objects.
Constraint bars are visible only when you place your cursor over the
highlighted nodes.
■ Dimensional constraints control distances or angles between 2D geometric
objects in a drawing.
The main dimensional constraints are: dynamic, annotational, and
reference constraints.
■ Dynamic constraints (default) - Used to constrain objects and are
displayed on demand.
■ Annotational constraints - Used to create associative variables, offset
distances, and so on.
■ Reference constraints (read-only) - Read-only dimensional constraints
(either dynamic or annotational).
When you place your cursor over a constrained object, you will see a glyph
denoting the object is constrained.
With AutoCAD LT, you can do the following:
■ View drawings containing constraints created using AutoCAD.
■ View and edit the geometric and dimensional constraints.
NOTE You cannot create constraints within AutoCAD LT.
Work with Dynamic Blocks
In AutoCAD, you can add new constraint parameters to a dynamic block in
the Block Editor. In AutoCAD LT, you can open drawings which include a
block definition containing geometric or dimensional constraints or a block
properties table but cannot add new parameters to the block definition.
When you work with constrained dynamic blocks in the Block Editor in
AutoCAD LT, you can modify the constraint values and delete constraints but
cannot add constraints in the Block Editor. You can manage the constraints
while in the Block Editor from the Parametric tab.
936 | Chapter 33 Work with Data in Other Formats