[mapserver-dev] LABEL BUFFER behavior changes

[Tamas Szekeres]

Hi Devs,

Was that intentional that the BUFFER paramerer for the label depends on
SYMBOLSCALE in mapserver 7?

For mapserver 6.x the buffer has been calculated as follows (in mapdraw.c):

label_buffer = (labelPtr->buffer*image->resolutionfactor);

For mapserver 7.x we use this formula:

textSymbolPtr->label->buffer * textSymbolPtr->scalefactor

where textSymbolPtr->scalefactor is in fact the layer->scalefactor

According to the documentation the buffer should be interpreted in pixels
so the 7.x behaviour is incorrect I think, where the buffer depends on the
actual scale/zoom.

I'm not aware of an RFC which would explain this change.

Let me know if I missed anything in this regard.

Thanks,

Tamas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-dev/attachments/20170717/a08c8a0c/attachment.html>