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â– Use object snaps as variables in an expression
â– Convert points between a UCS and the WCS
â– Filter the X, Y, and Z components of a vector
â– Rotate a point around an axis
Evaluating Expressions
CAL evaluates expressions according to standard mathematical rules of
precedence.
Mathematical operators in order of precedence
OperationOperator
Groups expressions( )
Indicates numeric exponent^
Multiplies and divides numbers*, /
Adds and subtracts numbers+, -
Calculating Points
You can use CAL whenever you need to calculate a point or a number within
a command.
For example, you enter (mid+cen)/2 to specify a point halfway between the
midpoint of a line and the center of a circle.
The following example uses CAL as a construction tool. It locates a center
point for a new circle, and then calculates one fifth of the radius of an existing
circle.
194 | Chapter 6 Create and Modify Objects
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