[Qgis-user] Data Defined operation

[Springfield Harrison]

Thanks Nyall & Don,

     Obvious when explained!  Excellent, lots of power here.

             Thanks again . . . .

Cheers . . . . . Spring




On 07-Feb-2017 20:31, Nyall Dawson wrote:
> On 8 February 2017 at 14:08, Springfield Harrison <stellargps at gmail.com> wrote:
>> Hello,
>>
>>      Attempting to use the Data Defined function (tool?).
>>
>>      The following configuration has no effect; it may be looking for a
>> colour input.  This DD is to set the background colour on a label where Type
>> = SL.
>>
>>      If I use this function on bold Text, it works but that requires no
>> input, it just toggles.
>>
>>      Where am I supposed to enter the "Expected Input" colour specifications?
> The expression needs to evaluate to a color string, whereas your
> expression evaluates to a boolean value.
>
> Something like this is acceptable:
>
> case when "Type" = 'SL' then '#ff0000' else '#00ff00' end
>
> Nyall
>
>
>
>> Data defined override
>> Active: yes  (ctrl|right-click toggles)
>> Expected input:
>> string [r,g,b,a] as int 0-255
>> Valid input types:
>> string
>> Current definition (expression):
>> "Type" = 'SL'
>>
>> Thanks very much . . . .
>>
>> Cheers . . . . . Springfield Harrison
>>
>>
>>
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> .
>