1.2.2 Guard

Guard is a special parameter that is used to deactivate or activate objects based on the parameters set.

In this example, column types are enumerated in a Group Object named Column Type. Then based on the value selected in ColumnType Parameter in the Input Group Object the geometry will generate either a rectangular column if ColumnType = Rectangular or a circular column if ColumnType = Circular.

Example:

<O N="Column Design" T="Project">

<O N="Column Type" T="Group">

<P N="Rectangular" V="1" />

<P N="Circular" V="2" />

</O>

<O N="Input" T="Group">

<P N="W" V="10" D="column width" Role="Input" Category="Input" />

<P N="L" V="10" D="column length" Role="Input" Category="Input" />

<P N="D" V="10" D="column diameter" Role="Input" Category="Input" />

<P N="H" V="100" D="column height" Role="Input" Category="Input" />

<P N="ColumnType" V="Circular" Role="Input" Category="Input" />

</O>

<O N="Geometry" T="Group">

<O T="Surface" Z="0">

<P N="Guard" V="ColumnType .EQ. Rectangular" />

<P N="Thickness" V="H" />

<O T="Point" X="0" Y="0" />

<O T="Point" X="W" Y="0" />

<O T="Point" X="W" Y="L" />

<O T="Point" X="0" Y="L" />

</O>

<O T="Circle" Z="0">

<P N="Guard" V="ColumnType .EQ. Circular" />

<P N="Thickness" V="H" />

<P N="Radius" V="D/2" />

</O>

</O>

</O>

List of Logical Operators

Here is a list of logical operators that can be used inside the expressions of Guard parameters.

• .AND.: and &&

• .OR.: or ||

• .LT.: less than <

• .LE.: less than or equal to <=

• .GT.: greater than >

• .GE.: greater than or equal to >=

• .EQ.: equal to ==

• .NE.: not equal to !=

• .NOT.: not !