Thanks Steve for confirming this. I'm wondering why we don't support
both attribute binding and expressions. It seems like a logical thing to
support.
Here is the map I was working on:
http://imaptools.com:8080/demo/australia.html
If you zoom in to the 1:250,000 there is detailed topographic map which
has about 90 layers in it.
The use case for expressions in the bindings is that getting the symbol
scaling and styling to look good takes some playing around with the
data. Since I was working with shapefiles, every time I needed to change
something I loaded the file mucked with it and exported it. I suppose
that I could have loaded all the data into postgis first and worked out
the rendering issues from postgis but I like working with shapefiles.
The way I typically work is to get the styling working the way I want it
to be then work to optimize if for performance.
For example the above mapfile has 3522 lines and 750 lines in the
symbols.txt, and only really has the styling correct for 1:250,000 in
spite of the fact that it starts rendering the topo maps at 1:2M and
you can see that it it too crowded at that level and the symbol sizes
and density need to be thinned out as you zoom out from 1:250K, which
will eventually double or triple the mapfile size.
Anyway, this is based on nice data from the Australian government. Once
I have my geocoder working the address bar will work also.
-Steve W
On 11/4/2016 10:57 AM, Lime, Steve D (MNIT) wrote:
Steve: A width value can be a double or a reference to an attribute
only (an attribute binding). It can't be an expression... You'd need
to do that computation elsewhere, obviously easy with a database.
Steve
-----Original Message----- From: mapserver-users
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen
Woodbridge Sent: Friday, November 04, 2016 9:44 AM To:
mapserver-users <mapserver-users@lists.osgeo.org> Subject:
[mapserver-users] Can Mapserver expressions contain parens?
I'm trying to use a style like:
STYLE COLOR "#000000" WIDTH (([FEATWIDTH]+.4)*10) END
but I'm getting:
getSymbol(): Symbol definition error. Parsing error near
(([FEATWIDTH]+.4)*10):(line 1620)
MapServer version 6.4.1 OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ
SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=CAIRO SUPPORTS=SVG_SYMBOLS
SUPPORTS=SVGCAIRO SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER
SUPPORTS=WFS_SERVER SUPPORTS=WCS_SERVER SUPPORTS=FASTCGI
SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL
INPUT=SHAPEFILE
-Steve W
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