Positioning and Orienting Labels

When a Label is created, its origin (held as the XYPS attribute) is placed at a fixed offset (default x 25mm, y 25mm) from its attachment point. The Label origin (and hence the Label) may be moved by the AT @ command, which resets XYPS to the position specified by the cursor. This command calls up the Point Construction Option form, which contains the point construction Option list button which allows positions to be defined in terms of end-points, intersection points,

If the Label’s OSET attribute is TRUE then the origin is held as an offset from the attachment point; if OSET is FALSE then the Label origin is held as an absolute Sheet coordinate.

Note that the coordinates specified with the AT command (whether explicit or from cursor input) are always taken to be absolute coordinates, irrespective of the OSET setting. To avoid any potential confusion when positioning labels explicitly, several alternatives are available. For example:

Note: When a Pipe element is labelled directly, the Pipe origin is assumed to be the position of the HEAD of the first Branch visible in the VIEW region, if any. If no Branch HEADs are visible in the VIEW region, then the position of the HEAD of the first Branch is used.

Constructed points (see Point and Line Construction) may also be used for Label positioning operations. See Summary of Commands section at the end of this Chapter for examples.

Labels may be oriented by the ANGLE command, which sets the Label’s ADEG attribute if an angle is specified explicitly, or the PPDI attribute if the orientation is specified as a p-point direction. (The p-point must belong to the associated Design item DDNM but need not be the same as the Label’s attachment point). For example:

Figure 13:4. Label Orientation