[mapserver-users] mapserver 5.6beta1: mindistance notworkingproperly?

[Alan Boudreault]

Hi Michael,

A similar problem has already been reported. tbonfort, danmo and I are 
currently working on that.

http://trac.osgeo.org/mapserver/ticket/3157

Thanks
Alan

On October 9, 2009 06:46:43 am Michael Schulz wrote:
> Hi Steve, Hi Alan,
> 
> while I was trying to put together a test case, I realized where the
> problem is: the use of sizeunits! The labels were drawn with sizeunits
> set to meters, so it seems that the calculation of the distance of the
> labels in pixel in this case goes wrong . Maybe this information helps
> to find out, what causes the effect.
> 
> Cheers, Michael
> 
> 2009/10/2 Michael Schulz <mschulz at webgis.de>:
> > Hi Steve, Hi Alan,
> >
> > exactly, that was the change I also noted in trac. When I realized the
> > effect, I reverted the last condition in maplabel.c. line 515, to its
> > previous state, only comparing the distance of the points with
> > mindistance. With the expected results, that I even got some more
> > labels. So basically the change is working, but I see a lot more
> > labels than with 54.
> >
> > Here are three screenshots of the effect:
> > - http://img35.imageshack.us/img35/7871/mindistlabelsms54.png
> > - http://img39.imageshack.us/img39/1130/mindistlabelsms56.png
> > - http://img32.imageshack.us/img32/5196/mindistlabelsms56wolabe.png
> > (MS56 without taking the labelsize into account)
> >
> > The maps are based on the osm data example, and as you can see it
> > renders flawlessly with mapserver 54. Maybe someone who also uses this
> > example can have a try with mapserv56 and see if it is the same. The
> > mindistance used is 150 px. The calls to images were getMap requests.
> >
> > Thanks, Michael
> >
> > 2009/10/1 Steve Lime <Steve.Lime at dnr.state.mn.us>:
> >> Michael, can you describe the effect you're seeing? The change Alan
> >> refers to should cause you to see fewer labels but your original message
> >> leads me to believe that's not the case. If you remove that option with
> >> the 5.6 beta does the map look different?
> >>
> >> Steve
> >>
> >>>>> Alan Boudreault <aboudreault at mapgears.com> 10/01/09 10:49 AM >>>
> >>
> >> In fact, that ticket changed the label distance calculation. Before,
> >> only the distance between label1 point and label2 point was calculated.
> >> Now, the label size is taken into account for the distance calculation.
> >> So, we are now sure that there is really the "mindistance" value between
> >> our labels.
> >>
> >> Thanks,
> >> Alan
> >>
> >> On October 1, 2009 10:20:11 am Alan Boudreault wrote:
> >>> Hi,
> >>>
> >>> Could you check that ticket please:
> >>> http://trac.osgeo.org/mapserver/ticket/3050
> >>>
> >>> Let me informed.
> >>>
> >>> Thanks,
> >>> Alan
> >>>
> >>> On October 1, 2009 10:12:57 am Steve Lime wrote:
> >>> > I'm not aware of any changes in that area of the code although
> >>> > something tells me there was a small change but will try and create a
> >>> > test case. Thanks for the testing...
> >>> >
> >>> > Steve
> >>> >
> >>> > >>> Michael Schulz <mschulz at webgis.de> 09/30/09 5:32 AM >>>
> >>> >
> >>> > Hi,
> >>> >
> >>> > thanks for the 5.6 beta1. I'm pretty curious about the new mapfile
> >>> > xml-format.
> >>> >
> >>> > I have a mapfile that uses MINDISTANCE in label objects, the maps and
> >>> > labels are generated fine with mapserver- 5.4, with
> >>> > mapserver-5.6-beta1 the MINDISTANCE value seems not to be taken into
> >>> > account. Can anyone confirm this behaviour?
> >>> >
> >>> > Cheers, Michael
> >>
> >> --
> >> Alan Boudreault
> >> Mapgears
> >> http://www.mapgears.com
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-- 
Alan Boudreault
Mapgears
http://www.mapgears.com