chroma-js/test/lcorrection-test.coffee

JavaScript library for color conversions

require 'es6-shim'
vows = require 'vows'
assert = require 'assert'
chroma = require '../chroma'


vows
    .describe('Testing lightess correction')

    .addBatch

        'simple two color linear interpolation':
            topic:
                f: chroma.scale(['white', 'black']).mode('lab')
            'center L is 50': (topic) ->
                assert.equal Math.round(topic.f(0.5).lab()[0]), 50

        'hot - w/o correction':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).mode('lab')
            'center L is 74': (topic) ->
                assert.equal Math.round(topic.f(0.5).lab()[0]), 74

        'hot - with correction':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).mode('lab').correctLightness(true)
            'center L is 50': (topic) ->
                assert.equal Math.round(topic.f(0.5).lab()[0]), 50

        'hot - w/o correction - domained [0,100]':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).domain([0,100]).mode('lab')
            'center L is 74': (topic) ->
                assert.equal Math.round(topic.f(50).lab()[0]), 74

        'hot - with correction - domained [0,100]':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).domain([0,100]).mode('lab').correctLightness(true)
            'center L is 50': (topic) ->
                assert.equal Math.round(topic.f(50).lab()[0]), 50

        'hot - w/o correction - domained [0,20,40,60,80,100]':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).domain([0,20,40,60,80,100]).mode('lab')
            'center L is 74': (topic) ->
                assert.equal Math.round(topic.f(50).lab()[0]), 74

        'hot - with correction - domained [0,20,40,60,80,100]':
            topic:
                f: chroma.scale(['white', 'yellow', 'red', 'black']).domain([0,20,40,60,80,100]).mode('lab').correctLightness(true)
            'center L is 50': (topic) ->
                assert.equal Math.round(topic.f(50).lab()[0]), 50

    .export(module)