54 lines
2.6 KiB
CoffeeScript
54 lines
2.6 KiB
CoffeeScript
require 'es6-shim'
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vows = require 'vows'
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assert = require 'assert'
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chroma = require '../chroma'
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vows
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.describe('Testing bezier interpolation')
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.addBatch
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'simple two color linear interpolation':
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topic:
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f: chroma.bezier ['white', 'black']
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'starts from white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
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'ends in black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
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'center is grey': (topic) -> assert.equal topic.f(0.5).hex(), '#777777'
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'three color quadratic bezier interpolation':
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topic:
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f: chroma.bezier ['white', 'red', 'black']
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'starts from white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
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'ends in black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
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'center is a greyish red': (topic) -> assert.equal topic.f(0.5).hex(), '#c45c44'
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'four color cubic bezier interpolation':
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topic:
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f: chroma.bezier ['white', 'yellow', 'red', 'black']
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'starts from white': (topic) -> assert.equal topic.f(0).hex(), '#ffffff'
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'ends in black': (topic) -> assert.equal topic.f(1).hex(), '#000000'
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'1st quarter': (topic) -> assert.equal topic.f(0.25).hex(), '#ffe085'
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'center': (topic) -> assert.equal topic.f(0.5).hex(), '#e69735'
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'3rd quarter': (topic) -> assert.equal topic.f(0.75).hex(), '#914213'
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'five color diverging quadratic bezier interpolation':
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topic:
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f: chroma.bezier ['darkred', 'orange', 'snow', 'lightgreen', 'royalblue']
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'starts from darkred': (topic) -> assert.equal topic.f(0).hex(), '#8b0000'
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'ends in royalblue': (topic) -> assert.equal topic.f(1).hex(), '#4169e1'
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'center is snow': (topic) -> assert.equal topic.f(0.5).hex(), '#fffafa'
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'1st quarter': (topic) -> assert.equal topic.f(0.25).hex(), '#e9954e'
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'3rd quarter': (topic) -> assert.equal topic.f(0.75).hex(), '#a6cfc1'
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'using bezier in a chroma.scale':
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topic:
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f: chroma.scale(chroma.bezier(['darkred', 'orange', 'snow', 'lightgreen', 'royalblue'])).domain([0,1],5).out('hex')
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'starts from darkred': (topic) -> assert.equal topic.f(0), '#8b0000'
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'ends in royalblue': (topic) -> assert.equal topic.f(1), '#4169e1'
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'center is snow': (topic) -> assert.equal topic.f(0.5), '#fffafa'
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'1st quarter': (topic) -> assert.equal topic.f(0.25), '#e9954e'
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'3rd quarter': (topic) -> assert.equal topic.f(0.75), '#a6cfc1'
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.export(module) |