Reference constraints (read-only) - Read-only dimensional constraints (either dynamic or annotational).Annotational constraints - Used to create associative variables, offset distances, and so on.Dynamic constraints (default) - Used to constrain objects and are displayed on demand.The main dimensional constraints are: dynamic, annotational, and reference constraints. Dimensional constraints control distances or angles between 2D geometric objects in a drawing.Constraint bars are visible only when you place your cursor over the highlighted nodes. Use constraint bars to view the geometric constraints applied to objects. Geometric constraints determine the relationships between 2D geometric objects or points on objects relative to each other.There are two general types of constraints supported: Geometric and Dimensional. A single variable change can cause all related objects to change automatically, enabling you to run through design iterations simply and effectively.

Using constraints, you can enforce requirements while experimenting with different designs.Ī constrained object will move in a predictable manner when edited or moved. Some of the drawings that you work with will contain design requirements enforced within the drawing itself through the use of constraints.

Autodesk autocad lt 2019