Yes, I had a look at it. Indeed, it provides a nice set of utility methods.
By the way, what the class ColorChecker does?

I will make a plugin for it in Roassal.

Alexandre


> On Feb 21, 2018, at 5:32 PM, Stephane Ducasse <stepharo.s...@gmail.com> wrote:
> 
> Alex you should look at my package because it can be useful to roassal.
> 
> 
> On Wed, Feb 21, 2018 at 9:05 PM, Alexandre Bergel
> <alexandre.ber...@me.com> wrote:
>> Well… you can change the color of any element (even if the visualization is 
>> open).
>> Simply goes to the canvas and change the trachel shape. I can provide an 
>> example if you wish.
>> 
>> Alexandre
>> 
>> 
>> 
>>> On Feb 21, 2018, at 8:38 AM, abdelghani ALIDRA <alidran...@yahoo.fr> wrote:
>>> 
>>> Hi Alex and thanks for your answer,
>>> By playing with the contrast I mean to change (dynamically) how visible 
>>> lighter colors are from darker ones. And by dynamically, I mean I dont want 
>>> to re-build the visu.
>>> 
>>> To be more specific, I can have for a certain visu, a shape coloured with 
>>> Color red and bordered with Color red slightlyDarker.
>>> At some point I would like to see the difference between these two colours 
>>> and at some other point I dont.
>>> So for instance, I increase the contrast and I see the border of the shape 
>>> them I decrease it then I see the shape uniformaly coloured.
>>> 
>>> So, is there a way to do so?
>>> Thanks,
>>> Abdelghani
>>> 
>>> 
>>> De : Alexandre Bergel <alexandre.ber...@me.com>
>>> À : abdelghani ALIDRA <alidran...@yahoo.fr>; Any question about pharo is 
>>> welcome <pharo-users@lists.pharo.org>
>>> Envoyé le : Mercredi 21 février 2018 2h19
>>> Objet : Re: [Pharo-users] Roassal : Playing with the contrast
>>> 
>>> Hi!
>>> 
>>> What do you mean with contrasts? You mean the colors?
>>> Currently, there is no way to automatically assign colors to a 
>>> visualization, although you can use a color palette (look at the class 
>>> RTPalette).
>>> 
>>> Cheers,
>>> Alexandre
>>> 
>>> 
>>>> On Feb 20, 2018, at 7:01 AM, abdelghani ALIDRA via Pharo-users 
>>>> <pharo-users@lists.pharo.org> wrote:
>>>> 
>>>> 
>>>> From: abdelghani ALIDRA <alidran...@yahoo.fr>
>>>> Subject: Roassal : Playing with the contrast
>>>> Date: February 20, 2018 at 7:01:20 AM GMT-3
>>>> To: "pharo-users@lists.pharo.org" <pharo-users@lists.pharo.org>
>>>> Reply-To: abdelghani ALIDRA <alidran...@yahoo.fr>
>>>> 
>>>> 
>>>> Hi,
>>>> 
>>>> I am wondering if there is a way to play with the contrast of Roassal 
>>>> visualisations.
>>>> If so, please tell me how :)
>>>> 
>>>> Thank you in advance
>>>> Abdelghani
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 


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