[mapserver-users] symbol circle (ellipse) rendered not round
but oval
Havard Tveite
havard.tveite at umb.no
Wed Jan 13 12:18:15 EST 2010
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
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>
>
--
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/
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