chroma-js/test/average.test.js

JavaScript library for color conversions

const vows = require('vows')
const assert = require('assert');
require('es6-shim');

const chroma = require('../index');

const colors = [[125,133,127], [131,127,134], [138,121,141], [144,114,147], [149,107,153],
    [165,83,170], [160,92,164], [170,73,175], [175,62,180], [155,100,159]];

vows
    .describe('Testing color averaging modes')
    .addBatch({
        'avg some colors': {
            topic: ['red', 'blue'],
            'is #5a0000'(topic) {
                assert.equal(chroma.average(topic).hex(), chroma.mix(topic[0], topic[1]).hex())
            }
        },
        'three colors': {
            topic: chroma.average(['blue', 'red', 'white'], 'rgb'),
            'is #5a0000'(topic) {
                assert.equal(topic.hex(), '#aa55aa')
            }
        },
        'alpha avg': {
           topic: chroma.average(['rgba(0,0,0,0)', 'red'], 'rgb'),
           'is #5a0000'(topic) { assert.deepEqual(topic.rgba(), [128, 0, 0, 0.5]) },
           'is #5a0000-2'(topic) { assert.deepEqual(topic.rgba(false), [127.5, 0, 0, 0.5]) }
       },
        'average in lab': {
            topic: chroma.average(['blue', 'red', 'white'], 'lab'),
            'is #5a0000'(topic) { assert.equal(topic.hex(), '#e26daf') }
        },
        'average h in lch': {
            topic: chroma.average([chroma.lch(50, 50, 0), chroma.lch(50, 50, 90)], 'lch').get('lch.h'),
            'is approximately 45'(topic) { assert.equal(Math.round(topic), 45) }
        },
        'average in hsl of same colors': {
            topic: chroma.average(['#02c03a', '#02c03a'], 'hsl'),
            'is same'(topic) { assert.equal(topic.hex(), '#02c03a') }
        },
        'average same color': {
            topic: chroma.average(["#02c03a", "#02c03a"],'hsl'),
            'is #02c03a'(topic) { assert.equal(topic.hex(), '#02c03a') }
        },
        'lrgb avergage': {
            topic: chroma.average(colors, 'lrgb'),
            'is ???'(topic) { assert.equal(topic.hex(), '#98689c') }
        }
    })
    .export(module)