Hi All,
So, as of r7923 MapServer can now render some super thin lines using
the subpixel rendering of AGG. The change allows you to enter values
for the WIDTH parameter as doubles/fractions which can give the result
I've been looking for.
I think is really cool, and if anyone is interested in the different
results you can check out the image comparisons I've posted on this
ticket:
http://trac.osgeo.org/mapserver/ticket/2745#comment:6
Thanks dmorrissette, sdlime, and tbonfort for making this happen!
Dane
On Sep 4, 2008, at 7:10 PM, Dane Springmeyer wrote:
Thomas,
Thanks for the tip, but I think I don't quite understand the right
syntax.
First of all, I'm running the mac binary from kyngchaos, version 5.2.0
I've tried to add two style blocks like:
LAYER
NAME world_opacity
DATA world_borders.shp
STATUS ON
TYPE POLYGON
CLASS
NAME "World"
STYLE
COLOR 242 239 249
OUTLINECOLOR -1 -1 -1
END
STYLE
COLOR -1 -1 -1
OUTLINECOLOR 127 127 127
OPACITY 50
WIDTH 1
END
END # class
END # layer
to create this full mapfile:
http://mapnik-utils.googlecode.com/svn/trunk/tutorials/hello_world/mapserver_comparison/mapfile_config/world.map
But that does not produce a result more akin to WIDTH 0.5, from what
I can tell. It simply lightens the color of the outline, and in this
case make it 'seem' even thicker. It is as if the opacity is not
working as a true alpha opacity.
Here is the example output with OPACITY 50:
http://mapnik-utils.googlecode.com/svn/trunk/tutorials/hello_world/mapserver_comparison/mapfile_config/map/hello_world_with_mapserver_mapfile_opacity.png
Is this the expected behavior or have I made an error in my mapfile
syntax (highly likely). Perhaps I am not correctly turning off the
outline for the first style?
The issue may also be with my OUTPUTFORMAT, which is not using the
RGBA:
OUTPUTFORMAT
NAME 'AGG'
DRIVER AGG/PNG
IMAGEMODE RGB
MIMETYPE "image/png"
END
I also tried with:
OUTPUTFORMAT
NAME 'AGGA'
DRIVER AGG/PNG
IMAGEMODE RGBA
MIMETYPE "image/png"
END
but I get an error when I add the 'AGGA' (based on reading http://mapserver.gis.umn.edu/docs/howto/agg-rendering-specifics)
:
msPostMapParseOutputFormatSetup(): General error message. Unable to
select IMAGETYPE `AGG'.
Any thoughts?
Thanks,
Dane
On Aug 31, 2008, at 2:50 PM, thomas bonfort wrote:
hi.
yes, you need two style blocks inside your class
cheers,
thomas
On Sun, Aug 31, 2008 at 9:43 PM, Dane Springmeyer
<[EMAIL PROTECTED]> wrote:
Hi Thomas,
Thanks for the followup.
The OPACITY keyword seems to apply to both the polyon fill (COLOR)
and the
outline (OUTLINECOLOR).
What is the trick to apply it to only the outline? I tried
OUTLINEOPACITY,
which of course does not exist.
Do I need to pull out a style class for just the outline?
Here is the mapfile I am working from:
http://mapnik-utils.googlecode.com/svn/trunk/tutorials/hello_world/mapserver_comparison/mapfile_config/world.map
Thanks,
Dane
On Aug 30, 2008, at 12:22 AM, thomas bonfort wrote:
Sorry for not hopping into the thread earlier, blame holidays :)
For the time being, you can achieve similar output with mapserver
5.2,
by using the OPACITY keyword at the style level
STYLE
COLOR r g b
OPACITY 50 # essentially the same as WIDTH 0.5
WIDTH 1
END
cheers,
thomas
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