Re: Any utility to adding a color wheel to WXT (and Qt) terminals?

[Daniel J S. <dan...@ie...>]

On 02/01/2017 03:36 PM, Ethan A Merritt wrote:
> On Wednesday, 01 February, 2017 14:04:18 Daniel J Sebald wrote:
>> Often when I am developing a set of plot commands I'll just toss in some
>> colors that are distinguishable, e.g., "red", "green".  Something quick.
>>   But those colors are often too bright or too monochrome to view
>> comfortably in a more "finished-product" plot such as a publication or
>> application.
>
> Why not use the default colors? Thay are specifically chosen to be
> distinguishable even if the viewer has color vision abnormalities or
> the publication process has changed the color space.  If you like primary
> colors or extremes of hue, fine, but what matches your personal
> preference may be very far from what is suitable in publication or in
> a widely-used GUI.  See for example Wong (2011) [Nature Methods 8:441],
> which was used as a guide for the default colors.

I personally don't like the extreme hue, but the point was the color 
wheel is a convenient way of picking non-extreme colors.

Anyway, the colors listed in "test", i.e., 1, 2, 3, ... sort of works. 
I've just tried that (7 looks to be a good medium hue red), but ran into 
a little snag with the present code I have:

gnuplot> set object 1 rectangle from first 0,0 to first 2,2 fillcolor 7 
fillstyle solid 1.0
                                                                       ^
          colorspec option not recognized

Although "linecolor 7" appears to work for lines, fillcolor 7 doesn't 
for polygons.  Is that supposed to work?  I need the color of a fill to 
match the color of a line.  Oh, wait, guess it does:

gnuplot> set object 1 rectangle from first 0,0 to first 2,2 fillcolor ls 
7 fillstyle solid 1.0


> It might be worth extending or replacing this list to include the 140 color
> names in the current w3c HTML standard.  Those, by the way, are available
> via a menu at http://www.w3schools.com/colors/colors_names.asp

Or an interpreter option "w3c", e.g.:

    ... linecolor w3c "PapayaWhip"

Interestingly, w3schools provides a color picker on its website:

http://www.w3schools.com/colors/colors_picker.asp

Dan


>
> 	Ethan
>
>
>
>> To choose customized colors "#RRGGBB", I often go to some
>> color wheel (usually gimp) and pick the colors visually, for which the
>> color wheel presents the associated RGB values.
>>
>> The thought just came to mind, Why not add a color wheel to the Qt and
>> WXT terminals for the sake of convenience?  That is, in the menu bar,
>> put a small "color-wheel" icon that will pop up the framework's
>> color-selector... the selector wouldn't control anything, but simply
>> help the user determine suitable RGB values.
>>
>> Does such a thing sound useful?
>>
>> Having said that, looking through the Qt terminal I see there is a
>> color-selector example already used for picking the background.  So,
>> what I'm suggesting is already present.  However, the color-selector
>> isn't obvious enough as a feature for convenience.
>>
>> BTW, the Qt background color selection has what I'd consider a bug.  Do
>> some test plot:
>>
>> set term qt
>> plot x
>>
>> and then click on the wrench/settings icon.  "Select background color"
>> has a white patch associated with it.  Click on "Select background
>> color".  Click "Cancel", and the QColorDialog closes but the associated
>> patch has turned black.  I'd assume that "Cancel" should not change the
>> example patch.
>>
>> Dan
>>
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