[mapserver-users] AGG vs. GD: Label placement problems

[thomas bonfort]

http://trac.osgeo.org/mapserver/ticket/2357

On Tue, Mar 18, 2008 at 1:05 PM, Doyon, Jean-Francois
<jdoyon at nrcan.gc.ca> wrote:
> Thanks Thomas, that'd be great ... is there a ticket open for this, or
>  should I open one? (I'd like to track progress on this issue ...)
>
>  J.F.
>
>
>
>  -----Original Message-----
>  From: mapserver-users-bounces at lists.osgeo.org
>  [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of thomas
>  bonfort
>  Sent: March 18, 2008 03:42
>  Cc: mapserver-users at lists.osgeo.org
>  Subject: Re: [mapserver-users] AGG vs. GD: Label placement problems
>
>  Yes, that's exactly the problem, as there's a difference of a few pixels
>  between the size of the label calculated by gd and the size it actually
>  takes when rendered with agg. I realize now that it can cause some quite
>  visible problems in the case you show here (labels to the left), as in
>  that case the few pixels difference can cause the label to overlap the
>  point symbol. I'll see if I can fix this in the days/weeks to come so
>  this can be included in 5.2
>
>  cheers,
>  thomas
>
>  On Mon, Mar 17, 2008 at 8:25 PM, Daniel Morissette
>  <dmorissette at mapgears.com> wrote:
>  > Doyon, Jean-Francois wrote:
>  >  >
>  >  > Labels that are to the left of the point seem to be placed
>  differently ... Look top-right ("Les Escoumins", "Saint Anne de Port
>  Neuf", etc ...) for an example, though it happens all over the place I
>  think.  Labels to the right of the point however seem ok.
>  >  >
>  >  > Is this a bug? A design change?  Can anything be done from the
>  mapfiel to mitigate this?
>  >  >
>  >
>  >  A few days ago, ThomasB wrote on mapserver-dev that in AGG mode, "gd
>  > is  still used [...] for the calculation of label sizes (thus some
>  > subtle  discreptancies in label placement, mostly visible if using a
>  > label
>  >  backgroundcolor)":
>  >
>  >  http://lists.osgeo.org/pipermail/mapserver-dev/2008-March/006868.html
>  >
>  >  Maybe that's what your running into? Hopefully Thomas will see this
>  > and  comment.
>  >
>  >  Daniel
>  >  --
>  >  Daniel Morissette
>  >  http://www.mapgears.com/
>  >
>  >
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