chroma-js
Version:
JavaScript library for color conversions
140 lines (117 loc) • 6.92 kB
text/coffeescript
require 'es6-shim'
vows = require 'vows'
assert = require 'assert'
chroma = require '../chroma'
vows
.describe('Some tests for chroma.scale()')
.addBatch
'simple rgb scale (white-->black)':
topic:
f: chroma.scale ['white','black']
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
'mid gray': (topic) -> assert.equal topic.f(0.5).hex(), '#7f7f7f'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
'simple hsv scale (white-->black)':
topic:
f: chroma.scale(['white','black']).mode('hsv')
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
'mid gray': (topic) -> assert.equal topic.f(0.5).hex(), '#808080'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
'colors': (topic) -> assert.deepEqual topic.f.colors(), ['#ffffff', '#000000']
'simple hsv scale (white-->black), classified':
topic:
f: chroma.scale(['white','black']).classes(7).mode('hsv')
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
'mid gray': (topic) -> assert.equal topic.f(0.5).hex(), '#808080'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
'colors': (topic) -> assert.deepEqual topic.f.colors(7), ['#ffffff', '#d5d5d5', '#aaaaaa', '#808080', '#555555', '#2a2a2a', '#000000']
'simple lab scale (white-->black)':
topic:
f: chroma.scale(['white','black']).mode('lab')
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
'mid gray': (topic) -> assert.equal topic.f(0.5).hex(), '#777777'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
'colorbrewer scale':
topic:
f: chroma.scale 'RdYlGn'
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#a50026'
'mid gray': (topic) -> assert.equal topic.f(0.5).hex(), '#ffffbf'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#006837'
'colorbrewer scale - domained':
topic:
f: chroma.scale('RdYlGn').domain([0, 100])
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#a50026'
'foo': (topic) -> assert.notEqual topic.f(10).hex(), '#ffffbf'
'mid gray': (topic) -> assert.equal topic.f(50).hex(), '#ffffbf'
'ends black': (topic) -> assert.equal topic.f(100).hex(), '#006837'
'colorbrewer scale - domained - classified':
topic:
f: chroma.scale('RdYlGn').domain([0, 100]).classes(5)
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#a50026'
'10': (topic) -> assert.equal topic.f(10).hex(), '#a50026'
'mid gray': (topic) -> assert.equal topic.f(50).hex(), '#ffffbf'
'ends black': (topic) -> assert.equal topic.f(100).hex(), '#006837'
'get colors': (topic) -> assert.deepEqual topic.f.colors(5), ['#a50026', '#f88d52', '#ffffbf', '#86cb66', '#006837']
'calling domain with no arguments':
topic:
f: chroma.scale('RdYlGn').domain([0, 100]).classes(5)
'returns domain': (topic) -> assert.deepEqual topic.f.domain(), [0, 100]
'returns classes': (topic) -> assert.deepEqual topic.f.classes(), [0, 20, 40, 60, 80, 100]
'source array keeps untouched':
topic: chroma.brewer.Blues.slice(0)
'colors are an array': (colors) ->
assert.equal colors.length, 9
'colors are strings': (colors) ->
assert.equal typeof colors[0], 'string'
'creating a color scale': (colors) ->
chroma.scale(colors)
assert true
'colors are still strings': (colors) ->
assert.equal typeof colors[0], 'string'
'domain with same min and max':
topic:
f: chroma.scale(['white','black']).domain([1, 1])
'returns color': (topic) -> assert.deepEqual topic.f(1).hex(), '#000000'
'simple num scale (white-->black)':
topic:
f: chroma.scale(['white','black']).mode('num')
'starts white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
'25%': (topic) -> assert.equal topic.f(0.25).hex(), '#bfffff'
'50%': (topic) -> assert.equal topic.f(0.5).hex(), '#7fffff'
'75%': (topic) -> assert.equal topic.f(0.75).hex(), '#3fffff'
'95%': (topic) -> assert.equal topic.f(0.95).hex(), '#0ccccc'
'ends black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
'css rgb colors':
topic: chroma.scale("YlGnBu")(0.3).css()
'have rounded rgb() values': (topic) -> assert.equal topic, 'rgb(170,222,183)'
'css rgba colors':
topic: chroma.scale("YlGnBu")(0.3).alpha(0.675).css()
'dont round alpha value': (topic) -> assert.equal topic, 'rgba(170,222,183,0.675)'
'get colors from a scale':
topic:
f: chroma.scale(['yellow','darkgreen'])
'just colors': (topic) -> assert.deepEqual topic.f.colors(), ['#ffff00', '#006400']
'five hex colors': (topic) -> assert.deepEqual topic.f.colors(5), ['#ffff00', '#bfd800', '#7fb100', '#3f8a00', '#006400']
'three css colors': (topic) -> assert.deepEqual topic.f.colors(3,'css'), ['rgb(255,255,0)', 'rgb(128,178,0)', 'rgb(0,100,0)' ]
'test example in readme':
topic:
f: chroma.scale('RdYlGn')
'five hex colors (new)': (topic) -> assert.deepEqual topic.f.colors(5), ['#a50026', '#f88d52', '#ffffbf', '#86cb66', '#006837']
'weird result':
topic:
f: chroma.scale([[ 0, 0, 0, 1 ], [ 255, 255, 255, 1 ]]).domain([0,10]).mode('rgb')
'has hex function at 0.5': (topic) -> assert.equal typeof topic.f(0.5).hex, 'function'
'has hex function at 0': (topic) -> assert.equal typeof topic.f(0).hex, 'function'
'scale padding, simple':
topic:
f: chroma.scale('RdYlBu').padding(0.15)
'0': (topic) -> assert.equal topic.f(0).hex(), '#e54e35'
'0.5': (topic) -> assert.equal topic.f(0.5).hex(), '#ffffbf'
'1': (topic) -> assert.equal topic.f(1).hex(), '#5c91c2'
'scale padding, one-sided':
topic:
f: chroma.scale('OrRd').padding([0.2, 0])
'0': (topic) -> assert.equal topic.f(0).hex(), '#fddcae'
'0.5': (topic) -> assert.equal topic.f(0.5).hex(), '#f16c4b'
'1': (topic) -> assert.equal topic.f(1).hex(), '#7f0000'
.export(module)