Hi Matthew: That functionality was indeed removed as part of 8.0. I kind of expect that we might build back something for more limited use cases if necessary, Does SLD support opacity/transparency?
--Steve On Tue, Feb 21, 2023 at 10:52 AM Matthew Graber <graber...@gmail.com> 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, 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 > 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 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 > _______________________________________________ > MapServer-users mailing list > MapServer-users@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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