Color Assigner

The color assigner will manage assigning consistent colors to unique resources in your application. This could be users, labels, etc. You may define a palette or preferred colors to use. The colors from the palette will be used in a least recently used (LRU) fashion. If a color from the palette is available, it will be assigned. Otherwise, a random color will be generated. When a resource no longer needs the color, the color may be released. If a color being released is one from the palette, it will be place on the end of the list of available palette colors.

Installation

npm install --save @convergence/color-assigner or npm install --save-dev @convergence/color-assigner

Basic Usage

// Create a new ColorAssigner using the default palette of colors.
import {ColorAssigner} from "@convergence/color-assigner";

const ca = new ColorAssigner();

// Get a new color for "id1"
const color1a = ca.getColorAsHex("id1");

// The same color will be returned again
const color1b = ca.getColorAsHex("id1");

// Release the color
ca.releaseColor("id1");

// A new color will be returned for id1.
const color1b = ca.getColorAsHex("id1");

// Get a color as an rgba string e.g. 'rgba (234, 40, 132, 255)'
const color2 = ca.getColorAsRgba("id2");

Advanced Usage

// Create a new ColorAssigner using one of the built in palettes.
import {ColorAssigner} from "@convergence/color-assigner";

const ca1 = new ColorAssigner(ColorAssigner.Palettes.DEFAULT);
const ca2 = new ColorAssigner(ColorAssigner.Palettes.DARK_12);
const ca3 = new ColorAssigner(ColorAssigner.Palettes.LIGHT_12);

// Create a new ColorAssigner using your own palette. 
// Any css color format is acceptable.
const colors = [
  'royalblue',               // css color name
  '#ff0000',                 // hex
  'rgba(128, 255, 128, 255)' // rgba
];
const ca4 = new ColorAssigner(colors);