35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
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# colormap [](https://travis-ci.org/bpostlethwaite/colormap)
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## Usage
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[](https://npmjs.org/package/colormap/)
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```js
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let colormap = require('colormap')
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let colors = colormap({
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colormap: 'jet',
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nshades: 10,
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format: 'hex',
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alpha: 1
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})
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```
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## API
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### list = colormap(options?)
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Property | Default | Meaning
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---|---|---
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`colormap` | `'jet'` | Color map name from the image above or a custom color scale — a sequence of `{index, rgb}` objects, where index is `0..1` number and `rgb` is a length 3/4 array with values for the color stop.
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`nshades` | `72` | Number of colors in returned array, the minimum number depends on `colormap`.
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`format` | `'hex'` | `'hex'` for `#aabbcc`, `'rgbaString'` for `rgba(255, 255, 255, 1)`, `'rba'` for `[255, 255, 255, 1]`, `'float'` for `[1, 1, 1, 1]`.
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`alpha` | `1` | Alpha range, can be an array with alpha values or just 2 values for start/end colors. |
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## Credits
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Color maps are inspired by [matplotlib](https://github.com/d3/d3-scale#sequential-color-scales) color scales, [cmocean](https://github.com/matplotlib/cmocean) oceanographic colormaps, [cosine gradients](https://github.com/thi-ng/color/blob/master/src/gradients.org) and others. Thanks to authors of these libs for their invaluable work.
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