register additional colormaps

[maxschmi]

I would really appreciate a method to extend the available colormaps with own colormaps.

I could imagine a method like:

import { registerColormap } from 'colormap'

registerColormap(key="new_colormap", colors=[[1,1,1],[0,0,0]])

So that you can later on use the colromap like this:

let colors = colormap({colormap: "new_colormap", nshades=10}) 

I think that would be quite easy to implement, as the colormap only needs to get added to colorScale variable, but it propably also needs to be set as a global constant.

[dy]

I think it should be be available now by extending colorScale object:

import colorScale from 'colormap/colorScale.js'
import colormap from 'colormap'

colorScale.new_colormap = [{index:0, rgb:[255,255,255]}, {index:1, rgb:[0,0,0]}]
let colors = colormap({colormap: "new_colormap", nshades=10}) 

[maxschmi]

That works smooth, thanks.

Or packed inside a function:

import colorScale from 'colormap/colorScale.js';

function registerColormap(key, colormap) {
  if (colormap.every(c => c.index !== undefined && c.rgb?.length == 3)) {
      colorScale[key] = colormap;
  } else {
      throw new Error('Invalid colormap');
  }
}

registerColormap("new_colormap", [{index:0, rgb:[255,255,255]}, {index:1, rgb:[0,0,0]}])