Do,
If you want to do this without using mapscript, you can pull the gradient
calculation as an attribute from your data table.
ALTER TABLE mytable ADD COLUMN gradient_color VARCHAR;
UPTATE mytable SET gradient_color = floor(gradient * 255)::text || ' 0 0';
Cheers
Mtro. Carlos Ruiz
On Monday, June 23, 2014 4:59 PM, "Lime, Steve D (MNIT)"
<[email protected]> wrote:
You can compute a color string using PostgreSQL string functions:
SELECT percentage || ‘ 0 0’ AS color FROM …
Steve
From:[email protected]
[mailto:[email protected]] On Behalf Of Do Wi
Sent: Sunday, June 22, 2014 3:50 PM
To: [email protected]
Subject: [mapserver-users] color attribute question
hi!
i have this scenario:
i have a column in my postgis table which contains a double representing a
percentage.
i want to color my polygons in a gradient fashion based on that number.
the docs states three ways to specify color:
1. three [1-255] numbers
2. hex string
3. [attribute]
but the attribute must be a string by itself in the same format as options 1 or
2.
how can i achieve something like
COLOR [percentage]*255 0 0
or
COLOR [percentage] 0 0
if percentageis already 0..255
for a red gradient for example?
thanks allot!
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