[mapserver-users] symbol circle (ellipse) rendered not
roundbut oval
Rahkonen Jukka
Jukka.Rahkonen at mmmtike.fi
Fri Jan 15 04:03:43 EST 2010
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>
> >>>>>>>>> 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>
> >>>>>>>>> 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>
> >>>>>>>>> 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/~ochriste/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>)
> >>>>>>>>> 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>
> >>>>>>>>>
> >>>>>>>>> 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
>
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