DRAW Reference Manual
Graphical Representation : Representation Rules
Representation Rules
The Representation Ruleset owns a series of Representation Rules, each of which contains a reference to a different Representation Style. A Ruleset can therefore be used to produce several graphical representations of the same VIEW. An example of the commands for setting up a Ruleset is:
NEW RRST /RSET1
- create Ruleset
NEW RRUL /R11 
- create Rule
USE /S2 FOR crit
- set Style reference (STYF). /S2 must already exist;
crit = Design element name or selection criteria
When more than one Rule is created, the order of the command sequence is important. Consider the command sequences:
Sequence 1
Sequence 2
NEW RRUL /R1
NEW RRUL /R1
USE /S2 FOR ALL EQUIP
USE /S2 FOR ALL NOZZ
NEW RRUL /R2
NEW RRUL /R2
USE /S2 FOR ALL NOZZ
USE /S1 FOR ALL EQUIP
Sequence 1 results in Nozzles being drawn according to style /S1, sequence 2 produces Nozzles in style /S2.
You can also assign a style reference to an individual named Design element or a series of named elements, for example:
USE /S2 FOR /PUMP1-1 /VESS1
Note:
The Design element must have a name: identifiers, for example, CE, FIRST EQUI or STRU 4 cannot be used.
Representation Rules can reference IDLIsts, using expressions if required. For example:
USE /STYLE1 FOR /LIST24 /LIST25
USE /STYLE2 FOR ALL IDLISTS WITH ( FUNC EQ 'STEAM' )
Once a Rule has been created, and a style set, the selection criteria can be changed without specifying the style by giving the command:
USE FOR crit
 
Example: 
USE FOR ALL BRAN WITH ( HBORE LE 80 )
Alternatively, the CRIT attribute can be set explicitly;
Example: 
CRIT ALL BRAN WITH ( HBORE LE 80 )
You can set up a rule to omit elements from a selection. For example, the Rules (in the given order) have the effect of drawing all Branches in Style S2 except small bore Branches, which is not drawn at all:
NEW RRUL /SMALLBORE
OMIT ALL BRAN WITH ( HBORE LE 80 AND TBORE LT 30 )
NEW RRUL /BRANCHES
USE /S2 FOR ALL BRAN
Named elements can also be omitted:
Example: 
OMIT /EQUIP99
The OMIT command sets the OMITFG attribute of the Rule, which automatically unsets the STYF of the Rule.
DRAW determines the style to use from a particular element by scanning through the list of RRULs (in database order) until a selection criteria is matched. If DRAW is unable to find a relevant rule for a component the default style is used. The default style is:
Tube Off
Centreline On
Profile Off
Pline On
Drawing Level 0
Ffstyle SOLID
Ffcolour 1
Clstyle CHAINED
Clcolour 1
Other drawing styles Off
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