Database Management
Reference Manual
Expressions
:
Positions, Directions and Orientations in Expressions
: Direction
Direction
The basic ways of defining a direction are:
•
Direction attribute plus optional WRT. For example,
HDIR OF /PIPE1 WRT /*
•
Cartesian direction. For example,
N 45 W
•
Cartesian direction WRT to an element.
•
All Cartesian directions are returned in the axis of the owner of the current element. For example:
(U WRT CE )
•
will return the Z axis of the current element relative to its owner.
Q ( Z WRT /SCTN )
•
will return the Z axis direction of /SCTN relative to the owner of the current element. For example, if the result is required in world coordinates the current element must be the World or a Site.
•
FROM pos2 TO pos2. For example
FROM N 50 WRT CE TO N 100
•
Keyword AXES followed by a p-point or pline.
•
The CLOSEST keyword, which will find the closest element in a particular direction. The syntax is:
>- CLOSEST type -+- WITH exp -.
| |
‘------------+- DIRECTION dir -+- EXTENT val -.
| |
‘--------------+-->
cont
continued
>-+- AFTER val -.
| |
‘-------------+- FROM ? -.
| |
‘----------+-->
•
In the above graph the keywords are:
•
EXTENT, which is how far to search in the direction specified, default 10M
•
AFTER, or the distance along vector after which to start search, default 0M
•
FROM, which specifies an alternative start point other than current element. This is of particular use for a branch where you might want to specify the HPOS or TPOS.
•
Examples are:
CLOSEST DIR E
CLOSEST BOX WITH ( PURP EQ ’FLOO’ ) DIR D WRT /* EXTENT 20M
CLOSEST VALVE DIR N 45 U FROM E100 N200 U300
CLOSEST BRAN HANG AFTER 2M
1974 to current year.
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