[mapserver-users] symbol circle (ellipse) rendered not round but oval

Oliver Christen oliver.christen at camptocamp.com
Thu Jan 14 07:20:36 PST 2010


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/
>>>
>>
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