DRAW Reference Manual
Dimensioning
: Dimensioning Skewed Pipe in Isometric Views
Dimensioning Skewed Pipe in Isometric Views
Dimensions on skewed Pipe in isometric views can have misleading graphics. This can be avoided by using a constructed Dimension Point, whose position is defined by a RULE set which gets one coordinate of position from one Component and the remainder from another. This constructed Dimension Point can then be used with either Component to draw Dimensions with sensible graphics.
For example, an elevation Dimension is required between a Valve and an Elbow in skewed pipe. Sensible graphics can be achieved by the following:
NEW LDIM
FROM valve_id
NEW DPOI
RULE SET POS
(E (POS(1) OF <valve_id> WRT /* ) $
(N (POS(2) OF <valve_id> WRT /* ) $
(U (POS(3) OF <elbow_id> WRT /* )
RULE EXEC POS
A copy of this Dimension Point can be used in other Dimensions to dimension between the Elbow and the Easting/Northing of the Valve.
Refer to
Representation
further information about
rule sets
.
1974 to current year.
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