[Qgis-developer] Rule based renderer and colours

Nathan Woodrow madmanwoo at gmail.com
Sat Apr 13 00:17:35 PDT 2013


Have you tried the new data defined properties in master.

Sent from some fancy phone looking thingo
From: Chris Crook
Sent: 13/04/2013 5:10 PM
To: qgis-developer at lists.osgeo.org
Subject: [Qgis-developer] Rule based renderer and colours

I really like the rule based renderer.  One thing that doesn't seem
easy though is to use the "colour" data defined property, as it isn't
clear (and possibly not easy) to generate an expression for a colour.

I am thinking it would be really useful to have a "Colour" section in
the function list, with at least two functions - rgb(x,y,z), and
ramp(name,value) (value from 0 to 1, or 0 to 100?).  Possibly one more
- rgba(x,y,z,a).  Then it would be very easy to build colours from

I'm guessing this would be easy to do - any takers?  or pointers to
where to implement it?


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