GDDM-GKS V1R1 Programming Guide and Reference
GDDM-GKS V1R1 Programming Guide and Reference
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GSSGP GDDM-GKS V1R1 Programming Guide and Reference SC33-0334-00 |
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Purpose
Function: To set segment priority. Segment function. Sets the priority for a segment. Parameters sgna (specified by user) (fullword integer)
prior (specified by user) (short floating point)
Operating states WSOP, WSAC, SGOP Related functions Create segment (GCRSG), Inquire segment attributes (GQSGA), Inquire dynamic modification of segment attributes (GQDSGA) Description This function sets "front-to-back" display priority for segment sgna. The segment priority in the segment state list for the segment is set to the value given by prior. If displayed segments overlap, precedence is given to segments with higher priority. Segments with lower priority are displayed as being behind overlapping segments with a greater priority. If segments with the same priority overlap, the last segment drawn is placed on top. Segment priority also affects pick input. When overlapping or intersecting segments are picked, the segment with the higher priority is delivered. The following illustrations show the effect of the hierarchy of segment priorities. In the first display, the segments are drawn in the order in which they were created. Higher-numbered panels overlap lower-numbered ones. The second display shows the effect of GSSGP when lower-numbered segments are assigned higher priorities. When segment priorities are set using this function, an implicit regeneration of the display may be required at workstations where the segment is displayed. If the implicit regeneration mode of a workstation is suppressed, you can call Redraw all segments on workstation (GRSGWK) to ensure a true representation of the graphics picture, including segment priority. Principal errors
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 Copyright IBM Corporation 1990, 2012 |
