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120 lines
3.4 KiB
120 lines
3.4 KiB
4 years ago
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# color [](https://travis-ci.org/Qix-/color)
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> JavaScript library for immutable color conversion and manipulation with support for CSS color strings.
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```js
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var color = Color('#7743CE').alpha(0.5).lighten(0.5);
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console.log(color.hsl().string()); // 'hsla(262, 59%, 81%, 0.5)'
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console.log(color.cmyk().round().array()); // [ 16, 25, 0, 8, 0.5 ]
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console.log(color.ansi256().object()); // { ansi256: 183, alpha: 0.5 }
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```
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## Install
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```console
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$ npm install color
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```
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## Usage
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```js
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var Color = require('color');
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```
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### Constructors
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```js
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var color = Color('rgb(255, 255, 255)')
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var color = Color({r: 255, g: 255, b: 255})
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var color = Color.rgb(255, 255, 255)
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var color = Color.rgb([255, 255, 255])
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```
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Set the values for individual channels with `alpha`, `red`, `green`, `blue`, `hue`, `saturationl` (hsl), `saturationv` (hsv), `lightness`, `whiteness`, `blackness`, `cyan`, `magenta`, `yellow`, `black`
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String constructors are handled by [color-string](https://www.npmjs.com/package/color-string)
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### Getters
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```js
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color.hsl();
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```
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Convert a color to a different space (`hsl()`, `cmyk()`, etc.).
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```js
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color.object(); // {r: 255, g: 255, b: 255}
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```
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Get a hash of the color value. Reflects the color's current model (see above).
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```js
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color.rgb().array() // [255, 255, 255]
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```
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Get an array of the values with `array()`. Reflects the color's current model (see above).
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```js
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color.rgbNumber() // 16777215 (0xffffff)
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```
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Get the rgb number value.
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```js
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color.hex() // 0xffffff
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```
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Get the hex value.
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```js
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color.red() // 255
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```
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Get the value for an individual channel.
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### CSS Strings
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```js
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color.hsl().string() // 'hsl(320, 50%, 100%)'
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```
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Calling `.string()` with a number rounds the numbers to that decimal place. It defaults to 1.
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### Luminosity
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```js
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color.luminosity(); // 0.412
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```
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The [WCAG luminosity](http://www.w3.org/TR/WCAG20/#relativeluminancedef) of the color. 0 is black, 1 is white.
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```js
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color.contrast(Color("blue")) // 12
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```
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The [WCAG contrast ratio](http://www.w3.org/TR/WCAG20/#contrast-ratiodef) to another color, from 1 (same color) to 21 (contrast b/w white and black).
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```js
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color.isLight(); // true
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color.isDark(); // false
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```
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Get whether the color is "light" or "dark", useful for deciding text color.
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### Manipulation
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```js
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color.negate() // rgb(0, 100, 255) -> rgb(255, 155, 0)
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color.lighten(0.5) // hsl(100, 50%, 50%) -> hsl(100, 50%, 75%)
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color.darken(0.5) // hsl(100, 50%, 50%) -> hsl(100, 50%, 25%)
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color.saturate(0.5) // hsl(100, 50%, 50%) -> hsl(100, 75%, 50%)
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color.desaturate(0.5) // hsl(100, 50%, 50%) -> hsl(100, 25%, 50%)
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color.grayscale() // #5CBF54 -> #969696
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color.whiten(0.5) // hwb(100, 50%, 50%) -> hwb(100, 75%, 50%)
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color.blacken(0.5) // hwb(100, 50%, 50%) -> hwb(100, 50%, 75%)
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color.fade(0.5) // rgba(10, 10, 10, 0.8) -> rgba(10, 10, 10, 0.4)
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color.opaquer(0.5) // rgba(10, 10, 10, 0.8) -> rgba(10, 10, 10, 1.0)
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color.rotate(180) // hsl(60, 20%, 20%) -> hsl(240, 20%, 20%)
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color.rotate(-90) // hsl(60, 20%, 20%) -> hsl(330, 20%, 20%)
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color.mix(Color("yellow")) // cyan -> rgb(128, 255, 128)
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color.mix(Color("yellow"), 0.3) // cyan -> rgb(77, 255, 179)
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// chaining
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color.green(100).grayscale().lighten(0.6)
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```
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## Propers
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The API was inspired by [color-js](https://github.com/brehaut/color-js). Manipulation functions by CSS tools like Sass, LESS, and Stylus.
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