Improve auto-generated colors - visual distunguishability

[breznak]

I'd like to suggest an improvement to the way how colors are automatically assigned by the algorithm, the current code is in:

dygraphs/src/dygraph.js

Line 1287 in f71d995

var idx = i % 2 ? (half + (i + 1)/ 2) : Math.ceil((i + 1) / 2);

From my experience described at
davidmerfield/randomColor#50 (comment)
this does not work as expected (for larger, ~11) number of elements.

My proposal is to offload this functionality to a specialized library https://github.com/davidmerfield/randomColor/ that works reasonably well, is distributed by npm, bower and has further plans to improve the feature: davidmerfield/randomColor#50

What do you think about that?
Cheers,

[danvk]

Can you include a before/after of the generated colors for N=1, 2, 3, ... in this issue?

[danvk]

(I'm open to changing the color selection.)

[breznak]

• The current coloring: (see the labels at right side)
  
• proposed change:

I'm still looking at using randomColor, will provide example when implemented. But their demo can be seen at: