Adding run-time constants to common expression handling.

[mapserver-bot]

Reporter: sdlime
Date: 2012/02/22 - 16:54
Trac URL: http://trac.osgeo.org/mapserver/ticket/4208
Basically it would be nice to expose a few run-time constants to MapServer logical expressions. Things like computed extent, scale, image size, and cellsize. Syntax would be something like !name! following after the !bbox! hack in PostGIS. While I’m only interested in MapServer logical expressions it’s reasonable that certain drivers could support them as well within their DATA/FILTER statements.

I’m proposing !bbox! (as define in PostGIS code), !minx! (etc…), !scale!, !width!, !height!, and !cellsize!. One use for this would be triggering scaling on parameters passed to style GEOMTRANSFORMs (e.g a buffer).

Steve

[tbonfort]

see #3827 for !bbox! substitutions. removing 6.2 milestone as I suspect it won't be ready in time

[sdlime]

Might as well consider for 7.0/RFC 91. --Steve

[tbonfort]

This won't happen for 7.0

[mapserver-bot]

This is an automated comment

This issue has been closed due to lack of activity. This doesn't mean the issue is invalid, it simply got no attention within the last year. Please reopen with missing/relevant information if still valid.

Typically, issues fall in this state for one of the following reasons:

• Hard, impossible or not enough information to reproduce
• Missing test case
• Lack of a champion with interest and/or funding to address the issue