[QGIS-Developer] Broken 'randomness' for new layer styles?

[Raymond Nijssen]

Hi Nyall,

Great idea to improve those random colors! This could also be a function 
instead of a palette in my opinion. I even guess it already is, since I 
think qgis stopped using very dark random colors a while ago.

I think those colors should be:
- not too dark (too close to black)
- not too close to grey
- not bright yellow, since this is the selection color

Another thought here, for polygons I find myself changing the standard 
black outline to a darker and opaque version of the fill color. And 
often I prefer using a transparent fill color cause it makes it much 
easier to viewing results on the background map. Could this be the 
default or an option?

Or should I just wait for qgis 3.2 and add create a palette for this? :)

Regards,
Raymond


On 03-02-18 05:17, Nyall Dawson wrote:
> On 2 February 2018 at 21:52, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>> Somebody (Raymond ;-) ) 'complained' to me that running a processing
>> algorithm everytime comes up with an (ugly) brown style.
> 
> I've noticed this too - but had assumed it was just some setting I'd
> changed locally. It's fixed by https://github.com/qgis/QGIS/pull/6254
> 
> BUT
> 
> Coincidentally, Mathieu and I have been speaking this week about
> approaches to improve the random colors picked for layers. We came up
> with a similar approach:
> 
> - find a palette of ~100 colors which we think look good for layers,
> and remove gross colors from this
> - include this palette as an additional pre-installed color palette
> within the standard QGIS install
> - on startup, pick a random starting color from this list and a random
> direction (forward or backward). When adding layers, grab this color
> for the layer and then jump to the next/previous color in the preset
> palette for the next layer added.
> - (for 3.2 : allow users to pick which palette to use for new layer colors)
> 
> How's this sound? I'd love to address this for 3.0 - our default
> random color selection often picks yuck colors, and I think it'd be
> great if 3.0 "magically" produced nicer looking maps for users without
> any work required by them!
> 
> Nyall
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