经典用户界面 > 采用 Creo Elements/Direct Drafting 经典用户界面的 Parametric Design > Working with Parametric Design > Assigning Constraints
Assigning Constraints
Constraints can be assigned manually or automatically to elements in the zone. All constraint tools are in the PARAMETRIC DESIGN 2 menu (referred to as MENU 2 in this manual).
The constraint tools on MENU 2 include:
• Commands: Occupy the top two rows; These are:
Command
Function
AUTO
The Automatic Constraint Generator.
ASSIGN
Manually assign constraints to geometric elements.
FREE
Remove constraints from geometric elements.
SHOW
Show existing constraints by displaying their icons.
CLEAR
Remove selected constraint icons (but not the constraints themselves) from the display.
BAN
Remove selected constraints and prevent them from being re-assigned by AUTO.
• Options: Options limit the actions of SHOW, CLEAR, FREE, and BAN. Available options are:
Option
Limiting Action
New
Act only on constraints added by the most recent AUTO command. New must be used immediately after AUTO. Any intervening command converts new constraints to "system" constraints. New only modifies the actions of SHOW and CLEAR.
User
Act only on constraints assigned manually by the user. If the user modifies a system-generated constraint, it converts to a "user" constraint.
System
Act only on constraints generated by AUTO and unchanged by the user.
Used
Act only on constraints actually used by the solver during the most recent AUTO or SOLVE command.
Unused
Act only on constraints that were not used by the solver during the most recent SOLVE command.
Banned
Act only on constraints that have been banned by the user; i.e., constraints that cannot be assigned by AUTO.
Violated
Act only on constraints marked "violated" by the most recent SOLVE.
• Types: These blocks specify the available constraint types. You must always specify a type for ASSIGN, SHOW, and CLEAR. Types can also be used to limit the actions of FREE and BAN. A generic type, All Types, refers to all the available constraint types. See Constraint Types for a complete description of each type.
The following sections describe each of the constraint assignment commands.
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