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Diffstat (limited to 'node_modules/chroma-js/test/bezier-test.coffee')
| -rw-r--r-- | node_modules/chroma-js/test/bezier-test.coffee | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/node_modules/chroma-js/test/bezier-test.coffee b/node_modules/chroma-js/test/bezier-test.coffee new file mode 100644 index 0000000000..82be155958 --- /dev/null +++ b/node_modules/chroma-js/test/bezier-test.coffee @@ -0,0 +1,51 @@ +require 'es6-shim' +vows = require 'vows' +assert = require 'assert' +chroma = require '../chroma' + + +vows + .describe('Testing bezier interpolation') + + .addBatch + + 'simple two color linear interpolation': + topic: -> chroma.interpolate.bezier ['white', 'black'] + 'starts from white': (topic) -> assert.equal topic(0).hex(), '#ffffff' + 'ends in black': (topic) -> assert.equal topic(1).hex(), '#000000' + 'center is grey': (topic) -> assert.equal topic(0.5).hex(), '#777777' + + 'three color quadratic bezier interpolation': + topic: -> chroma.interpolate.bezier ['white', 'red', 'black'] + 'starts from white': (topic) -> assert.equal topic(0).hex(), '#ffffff' + 'ends in black': (topic) -> assert.equal topic(1).hex(), '#000000' + 'center is a greyish red': (topic) -> assert.equal topic(0.5).hex(), '#c45c44' + + 'four color cubic bezier interpolation': + topic: -> chroma.interpolate.bezier ['white', 'yellow', 'red', 'black'] + 'starts from white': (topic) -> assert.equal topic(0).hex(), '#ffffff' + 'ends in black': (topic) -> assert.equal topic(1).hex(), '#000000' + '1st quarter': (topic) -> assert.equal topic(0.25).hex(), '#ffe085' + 'center': (topic) -> assert.equal topic(0.5).hex(), '#e69735' + '3rd quarter': (topic) -> assert.equal topic(0.75).hex(), '#914213' + + 'five color diverging quadratic bezier interpolation': + topic: -> chroma.interpolate.bezier ['darkred', 'orange', 'snow', 'lightgreen', 'royalblue'] + 'starts from darkred': (topic) -> assert.equal topic(0).hex(), '#8b0000' + 'ends in royalblue': (topic) -> assert.equal topic(1).hex(), '#4169e1' + 'center is snow': (topic) -> assert.equal topic(0.5).hex(), '#fffafa' + '1st quarter': (topic) -> assert.equal topic(0.25).hex(), '#e9954e' + '3rd quarter': (topic) -> assert.equal topic(0.75).hex(), '#a6cfc1' + + 'using bezier in a chroma.scale': + topic: -> + bez = chroma.interpolate.bezier ['darkred', 'orange', 'snow', 'lightgreen', 'royalblue'] + chroma.scale(bez).domain([0,1],5).out('hex') + 'starts from darkred': (topic) -> assert.equal topic(0), '#8b0000' + 'ends in royalblue': (topic) -> assert.equal topic(1), '#4169e1' + 'center is snow': (topic) -> assert.equal topic(0.5), '#fffafa' + '1st quarter': (topic) -> assert.equal topic(0.25), '#e9954e' + '3rd quarter': (topic) -> assert.equal topic(0.75), '#a6cfc1' + + + .export(module)
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