On Mon Dec 21 2015 02:44:25, Rob McDonald wrote:
> Is there a way in FLTK to get a sequence of Fl_Colors that are visually distinct?


Woah! Can. Of. Worms...

“Visually distinct” is the kicker here; folks have earned their PhD writing papers on what that constitutes...

There’s no fltk way of doing that, per se; indeed I’d say there’s no agreed way of doing that at all (though the W3C do have a pile of handy guidelines...)

If you just want to get “different” colours, and are not too bothered what they are, or that they maintain a constant contrast or visual separation from the other colours you are using, then you might get adequate results just doing:-

  int idx;
  for (idx = 60; idx < 255; ++idx)
  {
    Fl_Color X = idx;
    fl_color(X):
    ...etc...
  }

(where X is the index you want, based on the fltk colour cube or whatever)

That should give you different colours, but I can’t promise they will be "visually distinct".


For a more complex solution, I’d pick <whichever of the many possible algorithms you believe in> and use that to generate a set of suitably spaced RGB triplets and pass them via fl_color(R,G,B); to set the colour that way.



> 
> I'm making a technical plot with few to perhaps many lines on it.  I'll do a for-loop over the lines as I add them to my drawing canvas.  I'd like them to display with unique colors -- I'll know how many lines there will be before I start.
> 
> Is there a built-in way to do this in FLTK?
> 
> Thanks for any suggestions,


Even the unhelpful ones? (Like mine.)



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