[Qgis-user] Using color_rgba for symbols from field-value

[Bernd Vogelgesang]

Ah, found the problem.

Due to some other issues I did not realize, that the colours where
indeed taken from my rgb-field.
I only stared at the legend of the categorized layer, and there the
colours are still random.
Found no way to get the categories to adjust to the colours automaticly,
so it seems that I will have to do that manually again, which is a bit
**** when all the rest is data-driven.

Am 20.01.21 um 19:03 schrieb Bernd Vogelgesang:
> Hi Richard,
>
> thanx for having a look. First I overlooked this option (gnrr ..), but
> then, it did not work :(
>
> My layer is a  point layer of bat species found in batboxes. To this
> layer, I join a reference list via the species abbreviation to get the
> latin name and the colour.
>
> When I now use this layer to categorize the points by species and set
> my rgba-field for the symbol colour, there are still random colours
> applied to the categories.
>
> Bug, feature or misinterprestation of the workflow?
>
> Bernd
>
> Am 20.01.21 um 18:53 schrieb Richard McDonnell:
>> Hi Bernd,
>>
>> I have tested a little polygon dataset, adding a rgba field (as a
>> text string) and found that QGIS will actually use the Field type:
>> string option to apply the colour. Just select your rgba attribute
>> and it works fine.
>>
>> hope that helps.
>>
>> Reagrds,
>>
>> Richard
>>
>>
>>
>>
>>
>> --
>> Richard McDonnell MSc GIS, FME Certified Professional
>> FRM Data Management
>>
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>> -----Original Message-----
>> From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of
>> Bernd Vogelgesang
>> Sent: 20 January 2021 17:32
>> To: qgis-user <qgis-user at lists.osgeo.org>
>> Subject: [Qgis-user] Using color_rgba for symbols from field-value
>>
>>
>>
>> Hi,
>>
>>
>>
>> I would like to hard-wire the colours for categories with their
>> rgba-values in a field.
>>
>>
>>
>> I have a text field named "rgba" and am searching for a way to make
>> this color_rgba-function working.
>>
>> e.g '146,208,80,255'
>>
>> It's obvious that my colour-values are an array of strings, which
>> need to be somehow converted to integers to be eaten by the color_rgba.
>>
>>
>>
>> So in theory, the string '146,208,80,255' has to become an array,
>> probably by array("rgba"). But this array is an array of strings and
>> not of integers.
>>
>> Does anyone know how to achive this array of integers, so the
>>
>> color_rgba(somemagic("rgba") returns my colour?
>>
>>
>>
>> Cheers,
>>
>>
>>
>> Bernd
>>
>>
>>
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