[mapserver-users] symbol circle (ellipse) rendered not round
but oval
Oliver Christen
oliver.christen at camptocamp.com
Thu Jan 14 10:20:36 EST 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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