All,
My solution below turned out to not be correct either. It just ramps down from
RED to the color WHITE, no transparency.
Here is the layer block I’m using that I’m trying to fade to a transparent
feature:
MAP
TRANSPARENT true
IMAGECOLOR 254 254 254
<more stuff>
LAYER
METADATA
"ows_title" "bbox"
"gml_include_items" "all"
END
GROUP 'users'
NAME 'bbox'
STATUS ON
TYPE LINE
<DB connections stuff>
## the following greabs a 5 min chunk of data (BBOX geoms from the database
from 28 hrs ago and assigns a seq and elapsed time column to the result.
DATA "bbox from (
SELECT
row_number() over (order by accessed_at nulls last) as seq,
date_part('epoch', (now() - INTERVAL '28 hours' - accessed_at)::interval) as
elapsed,
id, accessed_at, bbox
FROM
layer_metrics
Where
accessed_at < (NOW() - INTERVAL '28 hours')
AND
accessed_at >= (NOW() - INTERVAL '28 hours' -
INTERVAL '5 minute')
) as subquery using unique id using
srid=200068"
LABELITEM "elapsed"
CLASS
#NAME "5 Minute Trail"
EXPRESSION ([elapsed] >= 0 AND [elapsed] < 300) ## 0-5min
STYLE
OUTLINECOLOR 0 0 0
OUTLINEWIDTH 1
#COLOR 0 255 0
COLORRANGE 255 0 0 254 254 254 ##red to opaque (see IMAGECOLOR in the MAP block
above)
DATARANGE 0 300
RANGEITEM "elapsed"
END
END
END
END
bobb
On Jun 2, 2015, at 4:27 PM, Ben Madin
<[email protected]<mailto:[email protected]>> wrote:
Bob,
Nice, I never knew that such a colorrange option existed (at least, I couldn’t
find it documented anywhere?) but I would have presumed maybe you could specify
the colour using the alpha like any other colour?
COLORRANGE 255 0 0 255 255 255 255 0 ## red -> transparent
Alternatively, if you had a common background colour, you could fade to that?
cheers
Ben
On 2015-06-03, at 04:48 , Basques, Bob (CI-StPaul)
<[email protected]<mailto:[email protected]>> wrote:
All,
Anyone know how to use a transparent color on one end of the coloring option?
COLORRANGE 255 0 0 ??? ??? ??? ## red -> transparent
It there a RGB color to use for Transparency to fade to? I basically want to
fade a line based on age to nothing.
Thanks
bobb
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Western Australia
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