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<p class="MsoNormal"><span style="font-size:11.0pt">Yeah, I saw those sections. I didn’t think we can just set p.dblval in the way the geomtransform code does – or maybe it is that simple - easy enough to test.
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Tamas Szekeres <szekerest@gmail.com>
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<b>Sent:</b> Thursday, March 5, 2026 5:00 PM<br>
<b>To:</b> Lime, Steve D (MNIT) <steve.lime@state.mn.us><br>
<b>Cc:</b> mapserver-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [MapServer-dev] Rendering Openstreetmap data in Mapserver<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In my understanding, the actual value should be provided somewhere here:
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://github.com/MapServer/MapServer/blob/89d81cb8d0fcf5d44e043d53afe70f6e6a785756/src/maputil.c#L713">https://github.com/MapServer/MapServer/blob/89d81cb8d0fcf5d44e043d53afe70f6e6a785756/src/maputil.c#L713</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">in a similar way as the geomtransform code:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://github.com/MapServer/MapServer/blob/89d81cb8d0fcf5d44e043d53afe70f6e6a785756/src/mapgeomtransform.c#L283">https://github.com/MapServer/MapServer/blob/89d81cb8d0fcf5d44e043d53afe70f6e6a785756/src/mapgeomtransform.c#L283</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Tamas<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Lime, Steve D (MNIT) <<a href="mailto:steve.lime@state.mn.us">steve.lime@state.mn.us</a>> ezt írta (időpont: 2026. márc. 5., Cs, 23:17):<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Hmmm… I think this should be possible but I’m not sure exactly what would need to change. The expression parser code is not particularly straightforward.
The map_cellsize token is generally recognized in the parser – so not limited to GEOMTRANSFORM but it’s not clear how it gets its value.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> MapServer-dev <<a href="mailto:mapserver-dev-bounces@lists.osgeo.org" target="_blank">mapserver-dev-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Tamas Szekeres via MapServer-dev<br>
<b>Sent:</b> Thursday, March 5, 2026 2:32 PM<br>
<b>To:</b> <a href="mailto:mapserver-dev@lists.osgeo.org" target="_blank">mapserver-dev@lists.osgeo.org</a><br>
<b>Subject:</b> [MapServer-dev] Rendering Openstreetmap data in Mapserver</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi Devs,
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm trying to create a vector based map for the openstreetmap data in Mapserver by utilizing the mapnik styles provided by the
<a href="https://github.com/openstreetmap-carto/openstreetmap-carto" target="_blank">
openstreetmap-carto</a> project. So far, I could achieve a very good result and the map looks is very similar to the online OSM at all scales, however the only thing I cannot replicate is the concept of the
<b>[way_pixels]</b> attribute conditions, where the feature’s area in pixels at the current map scale should be the part of the class expressions. I don't see such an option in Mapserver as it stands now, but supporting the already existing
<b>[map_cellsize] </b>would be a very close solution I think, however that is only implemented for the GEOMTRANSFORM expressions actually.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">For example the mapnik style expression <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">[way_pixels] > 750 <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">could be provided in a MapServer CLASS expression as somehing like:
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[way_area] > 750 * [map_cellsize] * [map_cellsize]<br>
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Would that be reasonable to implement <b>[map_cellsize]</b> in the CLASS expressions?
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best regards,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Tamas<o:p></o:p></p>
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