Wonderful to hear that you are using the MapServer.pdf! (I actually put
much effort into maintaining that PDF output, that but I never hear
feedback...until someone reports a problem, like you did now, ha).
Sometimes my updates differ from website rebuilds, will be sure to
update the PDF for the upcoming 8.0.1 release.
Again, thanks for this report!
(also, don't be afraid to report doc issues like this at
https://github.com/MapServer/MapServer-documentation/issues )
thanks again for the report!
-jeff
--
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/
On 2023-02-21 12:52 p.m., Matthew Graber wrote:
Hello all!
With MapServer 8, I'm wondering what the proper way to change the
opacity of a single layer in a multilayer WMS request is.
For example, the following URL excerpt shows the old way of
accomplishing this that worked while using MapServer 7:
SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&LAYERS=test_a,test_b&map.layer[test_b]=OPACITY+50
My understanding is that this would have the same effect as adding
"OPACITY 50" to the test_b layer in the mapfile. The mapfile containing
test_a and test_b did not have OPACITY included when they were written.
Obviously, this no longer works with MapServer 8, and now that request
has the same results as omitting the "&map.layer[test_b]=OPACITY+50"
portion entirely.
Based on https://mapserver.org/fr/MIGRATION_GUIDE.html
<https://mapserver.org/fr/MIGRATION_GUIDE.html>, I see that OPACITY now
belongs inside a COMPOSITE object. I tried the following modifications
to the request URL:
SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&LAYERS=test_a,test_b&map.layer[test_b].composite=OPACITY+50
SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&LAYERS=test_a,test_b&map.layer[test_b].composite[0]=OPACITY+50
I also tried this both with the mapfile left as-is, and with an empty
COMPOSITE object being included in each layer object, and each time I
got the same unsuccessful result as before.
Is there a way to accomplish this in MapServer 8?
Also, does this map.layer[layername]=... syntax still work in MapServer
8? The documentation at
https://mapserver.org/cgi/controls.html#using-mapserver-version-8
<https://mapserver.org/cgi/controls.html#using-mapserver-version-8>
suggests it might no longer work for MapServer 8 (based on the heading
"Using MapServer version < 8"), but the documentation at
https://mapserver.org/pdf/MapServer.pdf
<https://mapserver.org/pdf/MapServer.pdf> shows the same examples with
the heading "Using MapServer version <= 8" on page 1065 of the PDF, so
I'm unsure if this is still intended to work in MapServer 8.
Thank you,
Matt
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