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<p class="MsoNormal">Hi all: I’ve got a couple of ideas for minor enhancements I’d like to add into 6.2 and am looking for feedback. I don’t think<o:p></o:p></p>
<p class="MsoNormal">they quite rise to RFC status:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Adding runtime constants to common expression handling:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Basically it would be nice to expose a few runtime constants to MapServer logical expressions. Things like computed
<o:p></o:p></p>
<p class="MsoNormal">extent, scale, image size, and cellsizer. Syntax would be something like !name! following after the !bbox!<o:p></o:p></p>
<p class="MsoNormal">hack in PostGIS. While I’m only interested in MapServer logical expressions it’s reasonable that certain drivers could<o:p></o:p></p>
<p class="MsoNormal">support them as well within their DATA/FILTER statements.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m proposing !bbox! (as define in PostGIS code), !minx! (etc…), !scale!, !width!, !height!, and !cellsize!.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One use for this would be triggering scaling on parameters passed to style GEOMTRANSFORMs (e.g a buffer).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Adding classgroup as a CGI parameter:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve recently discovered the usefulness of class GROUP’s in setting up a mapfile to render nicely with and without an<o:p></o:p></p>
<p class="MsoNormal">image background. It’s very handy to manage 1 layer definition with alternative display configs. What sucks is triggering<o:p></o:p></p>
<p class="MsoNormal">the use of a group. Maybe I’m missing something but I had to do URL-based config on each layer that supported<o:p></o:p></p>
<p class="MsoNormal">the different class groups. It would be helpful to define a classgroup once and then for all layers with classes that use<o:p></o:p></p>
<p class="MsoNormal">it we set the layer CLASSGROUP. If a layer doesn’t use it then no change is made.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thoughts?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Steve<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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