Ok,
I thought of an easier way to ask my question about a capability being removed
in recent Mapserver.
How can a Pick a RGB color and use that as a TRANSPARENT piexel value across
the whole image, doesn't matter if the color is the background color, or a
feature color. I just want to make a particular color transparent.
It doesn't look like I can set transparent to TRUE without the background going
transparent. What I'm after is drawing a feature layer (polygon) as
transparent. Is there a way of setting a layer element transparent??
Bobb
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Basques, Bob
(CI-StPaul)
Sent: Monday, April 20, 2015 4:10 PM
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] Background transparency vs feature (polygon)
transparency.
All,
So I used to be able (MS6.1 and older?) to just define a color and then set
transparency to ON, and that color would be transparent. It didn't matter if
it was the background or a feature that was drawn in that color, it just turned
transparent.
I have a slightly different use case than most users as. I want to maintain a
background color for the image, but filter out polygons (parcels) to be
transparent in color (not opaque) as an overlay. This is to represent all
Public right-of-way areas, or rather, areas that are NOT parcels.
I've been trying for a couple of days now on and off to make the new methods
replicate this capability, to little effect. All the new tools assume a
transparency is going to be applied across the whole image background. I need
to be able to only poke holes in the background where there is a parcel polygon.
Is there a way to make this work like in the good old days (I mean good old
versions ?? :c) of Mapsever??
One suggestion I did find that would likely work, was the use a mask, but then
I need a larger bounding area to contain the mask (Is there a way of defining
an edgeless mask??). Is this the track I should be persuing? I could use our
City Boundary for this as a possible solution. Also, what's all the stuff
about a COMPOSITE block, looks like this is the future of masking type
operations in the future.
Thanks
Bobb
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