[mapserver-users] symbol circle (ellipse) rendered not round
but oval
Stephen Woodbridge
woodbri at swoodbridge.com
Thu Jan 14 09:11:13 EST 2010
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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