Generate constant color for an object based on a key. about pleasejs HOT 4 CLOSED

I was also looking for such a feature! I ended up generating a pseudo-random from my seed mod 360, and using that as the hue parameter.

from pleasejs.

I'm glad I've found this ticket, I had the same idea for improvement. Currently I'm using this function to do this task:

colorCache = {}

get_color = (seed) ->
    if not (seed of colorCache)
        colorCache[seed] = Please.make_color()
    return colorCache[seed]

But the problem is that this will increase memory usage as the colorCache object grows. The real solution would be to extend PleaseJS so it could generate the same color based on a value.

from pleasejs.

I also am using the hue value to generate constant colors based on a String. I'm using the hash function here:
http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/

and passing it into the hue property like so:

var colorSeed = Math.abs(hash) % 360;
var color = ColorUtil.make_color({golden: false,
   hue: colorSeed,
   saturation: 0.7,
   value: 0.8
});

Seems to be working well for my use case but only generates 360 unique colors. Probably a good idea to use memoization if calling it frequently.

from pleasejs.

You can already do this, use the seed option for make_color(); for example:

> Please.make_color({seed: 'some_string_must_be_string'});
[ '#72a0bf' ]

from pleasejs.