[Qgis-user] Style menu: data-defined color

[Bernhard Ströbl]

Example 1
CASE WHEN "value" = 'value1' THEN '#ff0000' ELSE '#ffff00' END
Fill all polygons with value = value1 in red and all the rest in yellow

Example 2
CASE WHEN "value" = 'value1' THEN '#ff0000' WHEN "value" = 'value3' THEN 
'#ffff00' END
Fill all polygons with value = value1 in red and with value3 in yellow 
(all the rest is filled in black as no ELSE is defined)

Bernhard

Am 23.07.2014 12:03, schrieb Julian Schall:
> Hi,
>
> maybe a simple question, but I couldn’t find the answer on my own: How
> can I automatically change the color of polygons by the content of an
> attribute table column?
>
> For Example: Polygonlayer with 3 objects. Object 1 and 2 have “value1”
> in the column “value” and object 3 has “value3” there. Now QGIS should
> fill polygon 1 and 2 in one color and polygon 3 in another.
> I tried it with data-defined propertiesàcheck color and choose “value”
> for field but then all polygons are black. Do I have to write a special
> expression?
>
> Thanks for help!
>
> Regards
>
> Julian
>


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