2012

Table Of Contents
DIMCONSTRAINTICON
Displays the lock icon next to the text for dimensional constraints.
Constrain a Design with Formulas and Equations
You can control geometry using mathematical expressions that include the
names of dimensional constraints, user variables, and functions.
Overview of Formulas and Equations
NOTE This topic has been included for AutoCAD-compatibility purposes only. In
AutoCAD LT, parametric drawing technology is limited to displaying and hiding
constraints, editing constrained geometry, and changing values in the Parameters
Manager.
Formulas and equations can be represented either as expressions within
dimensional constraint parameters or by defining user variables. For example,
the following illustration represents a design that constrains a circle to the
center of the rectangle with an area equal to that of the rectangle.
The Length and Width dimensional constraint parameters are set to constants.
The d1 and d2 constraints are simple expressions that reference the Length
and Width. The Radius dimensional constraint parameter is set to an expression
that includes the square root function, parentheses to determine the
precedence of operations, the Area user variable, the division operator, and
the constant, PI. These parameters are all displayed in the Parameters Manager.
740 | Chapter 19 Add Constraints to Geometry