[mapserver-users] symbol circle (ellipse) rendered not roundbut
oval
thomas bonfort
thomas.bonfort at gmail.com
Fri Jan 15 04:19:29 EST 2010
yes, it would be nice to have both possibilities: absolute spacing, and
size-scaled spacing. would there be a way to do this without having the need
to add yet another mapfile keyword?
regards,
thomas
On Fri, Jan 15, 2010 at 10:03, Rahkonen Jukka <Jukka.Rahkonen at mmmtike.fi>wrote:
> Hi,
>
> Could there be an alternative to give GAP that is relative to symbol size?
> Like
> RELATIVE_GAP=(x*SYMBOLSIZE) where SYMBOLSIZE is the width of a symbol?
> Should not be too heavy to calculate but would it lead to correct result?
>
> -Jukka Rahkonen-
>
> > Havard Tveite wrote:
> >
> > I think it is very important that there is a strong
> > relationship between the size of the symbols and the
> > spacing between the symbols. That makes scalable
> > patterned symbols possible. So I am happy with the
> > current (intended) behaviour.
> >
> > What is needed is good documentation with examples. I
> > think that there is work in progress on changing some of
> > the mechanisms for symbology in Mapserver. When this
> > work has been "finalised" I will be more than willing
> > to contribute to the documentation.
> >
> > Håvard
> >
> > Oliver Christen wrote:
> > > mmm, in my opinion it would be clearer if the GAP didnt depend from
> > > anything, set the GAP to 10 would make you a spacing of
> > 10px between each
> > > symbols border, whatever the values of the symbol POINTS.
> > > but that may be a change too important ?
> > >
> > > Oliver
> > >
> > >> Stephen Woodbridge wrote:
> > >>> So if I want ten pixel ellipses with a 1, 2, or 3 pixels
> > gap how would
> > >>> you specify that?
> > >>>
> > >>> points 10 10 gap 1 (or 2 or 3)?
> > >> Yes, if the rendering behaviour had been according to my
> > >> preferences,
> > >> POINTS 10 10 END
> > >> GAP 1 (or 2 or 3)
> > >> should do it (if you had specified SIZE 10 in the STYLE).
> > >> You specify the gap, and not the centre to centre distance
> > >> between the ellipses.
> > >>
> > >> But currently, this is not the behaviour.
> > >> Currently (with AGG in 5.6.0) you would have to specify:
> > >> POINTS 10 10 END
> > >> GAP 6 (or 7 or 8)
> > >> to get something close (if you specify SIZE 10 in the STYLE).
> > >>
> > >> Something seems to be wrong when the GAP is close to
> > >> half the diameter specified in POINTS - some of the gaps
> > >> will be as expected, while others are larger (closer to the
> > >> actual number specified in GAP).
> > >>
> > >> Håvard
> > >>
> > >>> -Steve W
> > >>>
> > >>> Havard Tveite wrote:
> > >>>> If Thomas B. agrees, I think it would be reasonable to also
> > >>>> open a bug on the gap calculation.
> > >>>> In my opinion, since the word "gap" is used, the correct
> > >>>> way to specify a symbol with ellipses that has the same
> > >>>> gap between them as the diameter of the ellipses should be
> > >>>> as follows:
> > >>>>
> > >>>> symbol
> > >>>> name dots
> > >>>> type ellipse
> > >>>> points 1 1 end
> > >>>> gap 1
> > >>>> end
> > >>>>
> > >>>> or an equivalent "scaled" version such as:
> > >>>>
> > >>>> symbol
> > >>>> name dots
> > >>>> type ellipse
> > >>>> points 23 23 end
> > >>>> gap 23
> > >>>> end
> > >>>>
> > >>>> The actual size of the ellipses (and the width of the gaps)
> > >>>> should be determined by the SIZE in CLASS-> STYLE. If
> > >>>> SIZE is 10, the ellipses should have a 10 pixel diameter
> > >>>> (and should have a 10 pixel gap between them).
> > >>>>
> > >>>> I have been hesitant to file bugs regarding symbology, since
> > >>>> the documentation on symbology is lacking and there is not
> > >>>> complete agreement on how some of the things that has to do
> > >>>> with symbology should work. There have also been
> > >>>> discussions on changing some behaviour and mechanisms for
> > >>>> symbology.
> > >>>> First we have to agree on how things should work and document
> > >>>> it, then we can file bugs if behaviour is not as expected.
> > >>>>
> > >>>> Håvard
> > >>>>
> > >>>> Oliver Christen wrote:
> > >>>>> Hi Steve
> > >>>>>
> > >>>>> I followed your suggestion and opened a documentation bug
> > >>>>>
> > >>>>> thanks
> > >>>>> Oliver
> > >>>>>
> > >>>>>> Hi guys,
> > >>>>>>
> > >>>>>> I haven't followed this whole thread but I think it
> > should be better
> > >>>>>> documented so people can understand how to use this.
> > Please write a
> > >>>>>> doc bug and put as much information in the bug about
> > how this works as
> > >>>>>> you have been able to discover.
> > >>>>>>
> > >>>>>> Thanks,
> > >>>>>> -Steve W
> > >>>>>>
> > >>>>>> Oliver Christen wrote:
> > >>>>>>> Thank you Håvard
> > >>>>>>> I see you have changed "points 1 1 end" by "points 8 8 end".
> > >>>>>>> Tell me if im wrong, but these values are only used
> > to render the
> > >>>>>>> proportions of the elipse but not it's size, is that correct?
> > >>>>>>> so if I understand correctly, using larger values for
> > the elipse
> > >>>>>>> width/height refine the rendering of the vectorised
> > dot geometry ?
> > >>>>>>>
> > >>>>>>> regards
> > >>>>>>> Oliver
> > >>>>>>>
> > >>>>>>>> Dear Oliver Christen,
> > >>>>>>>>
> > >>>>>>>> Using Mapserver 5.6.0 and AGG rendering, you can achieve what
> > >>>>>>>> you want by using a combination of ellipse size and gap size
> > >>>>>>>> in the symbol definition.
> > >>>>>>>> There is something strange in the calculations (a gap of
> > >>>>>>>> about half the ellipse size seems to produce
> > touching symbols),
> > >>>>>>>> so in your case, you could try to use 8 as the
> > diameter of the
> > >>>>>>>> ellipses, and 20 + 4 (half the ellipse size) = 24 as the
> > >>>>>>>> gap:
> > >>>>>>>>
> > >>>>>>>> symbol
> > >>>>>>>> name dots
> > >>>>>>>> type ellipse
> > >>>>>>>> points 8 8 end
> > >>>>>>>> gap 24
> > >>>>>>>> end
> > >>>>>>>>
> > >>>>>>>>
> > >>>>>>>> Håvard
> > >>>>>>>>
> > >>>>>>>> Oliver Christen wrote:
> > >>>>>>>>> thank you Thomas
> > >>>>>>>>>
> > >>>>>>>>> so if I have a dot of, for example, 8px and I want
> > a space pf 20px
> > >>>>>>>>> between the dots, I need a gap of 20/8 = 2.5
> > >>>>>>>>>
> > >>>>>>>>> but as far as I can see, Mapserver doesnt like
> > none-integer value
> > >>>>>>>>> for gap.
> > >>>>>>>>>
> > >>>>>>>>> what should I do? :(
> > >>>>>>>>>
> > >>>>>>>>> 2010/1/12 thomas bonfort <thomas.bonfort at gmail.com
> > >>>>>>>>> <mailto:thomas.bonfort at gmail.com>>
> > >>>>>>>>>
> > >>>>>>>>> gap in pixels = symbol->gap * style->size
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> On Tue, Jan 12, 2010 at 16:52, Oliver Christen
> > >>>>>>>>> <oliver.christen at camptocamp.com
> > >>>>>>>>> <mailto:oliver.christen at camptocamp.com>> wrote:
> > >>>>>>>>>
> > >>>>>>>>> GAP 20 is really giving unwanted result:
> > >>>>>>>>> http://dev.camptocamp.com/~ochriste/tilecache9.png<http://dev.camptocamp.com/%7Eochriste/tilecache9.png>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache9.png>
> > >>>>>>>>> though using only one style instead of two
> > seems to solve
> > >>>>>>>>> the
> > >>>>>>>>> oval problem (but why ???)
> > >>>>>>>>> style
> > >>>>>>>>> symbol "dots"
> > >>>>>>>>> size 8
> > >>>>>>>>> color 204 102 0
> > >>>>>>>>> outlinecolor 102 51 0
> > >>>>>>>>> end
> > >>>>>>>>> I dont understand how GAP is supposed working:
> > >>>>>>>>> with GAP 2, I had ~10px between dots,
> > >>>>>>>>> with GAP 3, I had ~18px between dots,
> > >>>>>>>>> with GAP 4, I had ~26px between dots
> > >>>>>>>>> whats the logic ?
> > >>>>>>>>>
> > >>>>>>>>> ----- Original Message -----
> > >>>>>>>>> *From:* thomas bonfort
> > >>>>>>>>> <mailto:thomas.bonfort at gmail.com>
> > >>>>>>>>> *To:* Oliver Christen
> > >>>>>>>>> <mailto:oliver.christen at camptocamp.com>
> > >>>>>>>>> *Cc:* mapserver-users at lists.osgeo.org
> > >>>>>>>>> <mailto:mapserver-users at lists.osgeo.org>
> > >>>>>>>>> *Sent:* Tuesday, January 12, 2010 4:36 PM
> > >>>>>>>>> *Subject:* Re: [mapserver-users] symbol circle
> > >>>>>>>>> (ellipse)
> > >>>>>>>>> rendered not round but oval
> > >>>>>>>>>
> > >>>>>>>>> symbol
> > >>>>>>>>> name dots
> > >>>>>>>>> type ellipse
> > >>>>>>>>> points 1 1 end
> > >>>>>>>>> gap 20
> > >>>>>>>>> end
> > >>>>>>>>>
> > >>>>>>>>> ...
> > >>>>>>>>>
> > >>>>>>>>> style
> > >>>>>>>>> symbol "dots"
> > >>>>>>>>> size 8
> > >>>>>>>>> color r g b
> > >>>>>>>>> outlinecolor r g b
> > >>>>>>>>> end
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> On Tue, Jan 12, 2010 at 16:31, Oliver Christen
> > >>>>>>>>> <oliver.christen at camptocamp.com
> > >>>>>>>>> <mailto:oliver.christen at camptocamp.com>> wrote:
> > >>>>>>>>>
> > >>>>>>>>> Hi Thomas :)
> > >>>>>>>>> thanks for the answer, but sadely
> > it didnt solve
> > >>>>>>>>> my problem:
> > >>>>>>>>> here are a few tests I did:
> > >>>>>>>>> using GAP 20 gave me really weird result:
> > >>>>>>>>>
> > >>>>>>>>> http://dev.camptocamp.com/~ochriste/tilecache6_gap_20.png<http://dev.camptocamp.com/%7Eochriste/tilecache6_gap_20.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache6_gap_20.png>
> > >>>>>>>>> using PATTERN 1 22 END gave me
> > better result, but
> > >>>>>>>>> the
> > >>>>>>>>> dot are still slightly oval:
> > >>>>>>>>>
> > >>>>>>>>> http://dev.camptocamp.com/~ochriste/tilecache7_pattern.png<http://dev.camptocamp.com/%7Eochriste/tilecache7_pattern.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache7_pattern.png>
> > >>>>>>>>> I wondered if the visual effect
> > may have come from
> > >>>>>>>>> the
> > >>>>>>>>> fact im pilling up two circle one
> > over the other,
> > >>>>>>>>> but
> > >>>>>>>>> even when trying to display only
> > the outer or inner
> > >>>>>>>>> circles, the circle are still slightly off:
> > >>>>>>>>>
> > >>>>>>>>>
> > http://dev.camptocamp.com/~ochriste/tilecache4_outercircle.png<http://dev.camptocamp.com/%7Eochriste/tilecache4_outercircle.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache4_outercircle.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > http://dev.camptocamp.com/~ochriste/tilecache5_innercircle.png<http://dev.camptocamp.com/%7Eochriste/tilecache5_innercircle.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache5_innercircle.png>
> > >>>>>>>>> (both at once
> > >>>>>>>>>
> > >>>>>>>>>
> > http://dev.camptocamp.com/~ochriste/tilecache3_bothcircle.png<http://dev.camptocamp.com/%7Eochriste/tilecache3_bothcircle.png>
> > >>>>>>>>>
> > >>>>>>>>>
> > <http://dev.camptocamp.com/%7Eochriste/tilecache3_bothcircle.png>)
> > >>>>>>>>> any other idea? ^_^
> > >>>>>>>>>
> > >>>>>>>>> ----- Original Message -----
> > >>>>>>>>> *From:* thomas bonfort
> > >>>>>>>>> <mailto:thomas.bonfort at gmail.com>
> > >>>>>>>>> *To:* Oliver Christen
> > >>>>>>>>> <mailto:oliver.christen at camptocamp.com>
> > >>>>>>>>> *Cc:* mapserver-users at lists.osgeo.org
> > >>>>>>>>> <mailto:mapserver-users at lists.osgeo.org>
> > >>>>>>>>> *Sent:* Tuesday, January 12,
> > 2010 3:18 PM
> > >>>>>>>>> *Subject:* Re:
> > [mapserver-users] symbol circle
> > >>>>>>>>> (ellipse) rendered not round but oval
> > >>>>>>>>>
> > >>>>>>>>> hi Oliver :)
> > >>>>>>>>>
> > >>>>>>>>> try with GAP 20 instead of
> > STYLE 1 20 END
> > >>>>>>>>> (which is
> > >>>>>>>>> deprecated btw, use PATTERN now)
> > >>>>>>>>>
> > >>>>>>>>> cheers,
> > >>>>>>>>> thomas
> > >>>>>>>>>
> > >>>>>>>>> On Tue, Jan 12, 2010 at 15:04,
> > Oliver Christen
> > >>>>>>>>> <oliver.christen at camptocamp.com
> > >>>>>>>>>
> > <mailto:oliver.christen at camptocamp.com>> wrote:
> > >>>>>>>>>
> > >>>>>>>>> hello
> > >>>>>>>>>
> > >>>>>>>>> I have a weird problem with
> > symbology.
> > >>>>>>>>> Im rendering a line with
> > dots, but the dots
> > >>>>>>>>> are
> > >>>>>>>>> not round but slightly
> > oval, see image
> > >>>>>>>>>
> > >>>>>>>>> http://dev.camptocamp.com/~ochriste/tilecache.png<http://dev.camptocamp.com/%7Eochriste/tilecache.png>
> > >>>>>>>>>
> > >>>>>>>>> <http://dev.camptocamp.com/%7Eochriste/tilecache.png>
> > >>>>>>>>>
> > >>>>>>>>> Any idea what could be the cause ?
> > >>>>>>>>>
> > >>>>>>>>> Here is my symbol definition:
> > >>>>>>>>>
> > >>>>>>>>> SYMBOL
> > >>>>>>>>> NAME "linie-gepunkt10"
> > >>>>>>>>> TYPE ELLIPSE
> > >>>>>>>>> POINTS
> > >>>>>>>>> 1 1
> > >>>>>>>>> END
> > >>>>>>>>> STYLE
> > >>>>>>>>> 1 20
> > >>>>>>>>> END
> > >>>>>>>>> FILLED TRUE
> > >>>>>>>>> END
> > >>>>>>>>>
> > >>>>>>>>> and my layer's class definition:
> > >>>>>>>>>
> > >>>>>>>>> CLASS
> > >>>>>>>>> EXPRESSION "3"
> > >>>>>>>>> MAXSCALEDENOM 200001
> > >>>>>>>>> STYLE
> > >>>>>>>>> SYMBOL "linie-gepunkt10"
> > >>>>>>>>> SIZE 10
> > >>>>>>>>> COLOR 102 51 0
> > >>>>>>>>> END
> > >>>>>>>>> STYLE
> > >>>>>>>>> SYMBOL "linie-gepunkt10"
> > >>>>>>>>> SIZE 8
> > >>>>>>>>> COLOR 204 102 0
> > >>>>>>>>> END
> > >>>>>>>>> END
> > >>>>>>>>>
> > >>>>>>>>> and the map outputformat:
> > >>>>>>>>>
> > >>>>>>>>> OUTPUTFORMAT
> > >>>>>>>>> NAME png
> > >>>>>>>>> DRIVER "AGG/PNG"
> > >>>>>>>>> MIMETYPE "image/png"
> > >>>>>>>>> IMAGEMODE RGBA
> > >>>>>>>>> EXTENSION "png"
> > >>>>>>>>> FORMATOPTION "INTERLACE=OFF"
> > >>>>>>>>> END
> > >>>>>>>>>
> > >>>>>>>>> _______________________________________________
> > >>>>>>>>> mapserver-users mailing list
> > >>>>>>>>> mapserver-users at lists.osgeo.org
> > >>>>>>>>>
> > <mailto:mapserver-users at lists.osgeo.org>
> > >>>>>>>>>
> > >>>>>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>> --
> > >>>>>>>> Håvard Tveite
> > >>>>>>>> Department of Mathematical Sciences and Technology, UMB
> > >>>>>>>> Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
> > >>>>>>>> Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/
> > >>>>>>>>
> > >>>>>>> _______________________________________________
> > >>>>>>> mapserver-users mailing list
> > >>>>>>> mapserver-users at lists.osgeo.org
> > >>>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > >>>>> _______________________________________________
> > >>>>> mapserver-users mailing list
> > >>>>> mapserver-users at lists.osgeo.org
> > >>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > >>>>>
> > >>>
> > >> --
> > >> Håvard Tveite
> > >> Department of Mathematical Sciences and Technology, UMB
> > >> Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
> > >> Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/
> > >>
> > >
> > >
> >
> > --
> > Håvard Tveite
> > Department of Mathematical Sciences and Technology, UMB
> > Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
> > Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/
> > _______________________________________________
> > mapserver-users mailing list
> > mapserver-users at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >
> _______________________________________________
> mapserver-users mailing list
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>
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