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 <[email protected]
<mailto:[email protected]>>
gap in pixels = symbol->gap * style->size
On Tue, Jan 12, 2010 at 16:52, Oliver Christen
<[email protected]
<mailto:[email protected]>> 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:[email protected]>
*To:* Oliver Christen
<mailto:[email protected]>
*Cc:* [email protected]
<mailto:[email protected]>
*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
<[email protected]
<mailto:[email protected]>> 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:[email protected]>
*To:* Oliver Christen
<mailto:[email protected]>
*Cc:* [email protected]
<mailto:[email protected]>
*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
<[email protected]
<mailto:[email protected]>> 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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http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
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
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