Hi, Robert,
A simple approach would be to generate a pseudo-random color based upon a value
unique to each record in your source data. For example, in the following
example the source data, pulled from a Microsoft Sql Server database, has an
integer column named "ShapeID":
layer
name "mupolygon"
status on
connectiontype plugin
plugin "C:/ms4w/Apache/specialplugins/msplugin_mssql2008.dll"
processing "CLOSE_CONNECTION=DEFER"
connection "server=...;"
projection 'init=epsg:4269' END # NAD83
units DD
DATA "shapeGeometry from soilmu_a_wy721_nad83 using unique shapeID using
SRID=4269"
type polygon
opacity 40
class
name "mupoly"
style
COLOR [convert(varchar(3), (128 + shapeID) % 253) + ' ' +
convert(varchar(3), (200 + shapeID) % 254) + ' ' + convert(varchar(3), (64 +
shapeID) % 255)]
outlinecolor 0 0 0
outlinewidth 1
end
end # of class "mupoly"
end # of layer "mupolygon"
In the context used above, the content of COLOR's specification (everything
between the square brackets) is passed on as part of the SQL statement
generated and transmitted to the database engine. Many variations are possible.
Note that this approach does not provide any protection against the unlikely
case where adjacent polygons display the same color.
I cannot speak to using data from other data sources. Best of luck with this.
- Phil Anzel
Web Soil Survey developer
Vistronix Inc for USDA/NRCS/ITC
-----Original Message-----
------------------------------
Message: 4
Date: Wed, 06 Jul 2011 09:08:28 +1200
From: "Robert Sanson" <[email protected]>
Subject: [mapserver-users] Random colours for polygon fill?
To: <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear Mapserver users
Just wondering if it is possible to colour a polygon Shape file layer with each
distinct polygon having a different colour?
Many thanks,
Robert Sanson
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