P-line Data

DRAW Reference Manual

Intelligent Text : Accessing Data from the DESIGN or Catalogue Databases : P-line Data

The P-line syntax may refer to the p-line used for annotation (i.e. that defined by the PKEY attribute) or to a specified p-line. A specific codeword defining the p-line precedes strings requesting position, direction and offset.

The syntax for p-lines is

(for PKEY). This syntax on its own is a request for the p-line name (e.g. NA or TOS, stored as the PKEY attribute). #PK may optionally be followed by the p-line name, for example #PKNA for p-line neutral axis. The p-line name (if present) may be 1-4 characters long. #PK may also be followed by MEML (i.e. #PKMEML) if data for the Section’s member-line is required. (This is only valid if the SCTN has its MEML attribute set.)

The p-line name ma

#PK^DIR or #PKNA^POSSU

The last format would mean ‘Upping of Start position of Neutral axis p-line’.

The internal delimiter ^ is necessary to separate the p-line attribute from the p-line name. There is nothing to stop you from having p-line names such as NAPO or even DIR. Names such as these would be impossible to separate from the p-line sub-codeword without this delimiter. Spaces are not permitted between the codeword and sub-codeword.

The following sub-codewords may follow the p-line codeword #PK or #PKname:


^DIR	p-line direction
^POSS	p-line start position
^POSSE	Easting of p-line start position
^POSSN	Northing of p-line start position
^POSSU	Upping of p-line start position
^POSE	line end position
^POSEE	Easting of p-line end position
^POSEN	Northing of p-line end position
^POSEU	Upping of p-line end position
^PKDI	position of point along p line defined by PKDI attribute
^PKDIE	Easting of point along p-line defined by PKDI attribute
^PKDIN	Northing of point along p-line defined by PKDI attribute
^PKDIU	Upping of point along p-line defined by PKDI attribute


#PKNA^POSS	gives the start position of the NA p-line
#PK^DIR	gives the direction of the p-line given by the PKEY attribute

The #PK^PKDI keyword will extract the position along a p-line at which a Label is attached. This will generate the position defined by the PKDI attribute of the label. Thus if PKDI = 0 the Label will be positioned at the start of the p-line (defined by the PKEY attribute) and the start position will be generated. If PKDI = 0.5 it will be at the p-line’s mid-point and its mid-point position generated.

Besides GLABs and SLABs, the VNOT, ADIM, DPPT, RPPT and PPPT elements also possess the PKDI attribute.

Note:

In DRAW p-lines are always cut back by SCTN end-preparations and member-lines are always extended to the ‘working point’. The positions generated by these codewords reflect this functionality.

The transform qualifier (refer to Transforming Position/Direction Data for further information) may be used with any of these sub-codewords, but not for p-line name. For example:


#PKTOS^POSEU<WRT /DATUM>	Gives the upping with respect to /DATUM of the end position of the TOS p-line
#PKTOS^POSEU+<WRT /DATUM>	As above, but gives upping in ‘+/-’ format
#DERPOS[a]	Derived position of a Joint, Fitting or Secondary Node, where a = N for Northing, E for Easting, U for Upping (optional)

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