colorlyjs v0.9.4

colorly

Colorly is am easy to use color parsing library which supports rgb, rgba, hex, cymk, hsl and hsv. It aims at the web which is why it follows the CSS4 standards.

Installation

Using npm

  $ npm install colorly 

Usage

The library consists of a few utility classed which are all combined under the hood of the Color class. An instance of this class represents a color which you may maipulate. See the API Reference below for all possible functions Color and ColorFactory provides. To get started do,

import {ColorFactory} from Colorly 

const myColor = ColorFactory.createColor('rgb', 0, 0, 0) //represents a black color

From this basis you may do your calculations, e.g.

myColor.addRed(255) // changes the color to be 255, 0, 0 -> a red color

Note that the alpha value in rgba as well as the relative values in cmyk, hsl and hsv are stored as a floating number between 0 and 1, while the hue and rgb values are processed in a range of 0 to 360 and 0 to 255 respectively. Therefore you add cyan as

myColor.addCyan(0.2) // add 20 percent Cyan to your color

Further, the library rounds numbers as selden as possible. But calling getter methods or toString methods leads to the numbers being rounded to a defined precision. The CSS rounding rules are used for this. The precision is set per color scheme and defaults to the following values

• rgb: 0, returns integers only
• cmyk, hsl, hsv: 2, returns floating numbers from 0 to one and leads to integers in CSS Strings, e.g. if c = 0, m = 0.2, y = 0.4 and k = 0.65, getBlack() would return 0.65 while toCMYKCSSString() would return cmyk(0, 20%, 40%, 65%)
• opacity: 2, returns floating numbers from 0 to 1

The ColorFactory only knows static methods to create colors. The easiest way is to use ColorFactory.createColor(mode, a, b, c, d), where mode can be one of:

• css: a css String which holds a rgb, rgba, hex, cmyk, hsl or hsv color, such as 'rgb(255, 255, 255)'
• hex: either a decimal number which may represented as a 3,4,6 or 8 digit hex code, or a hexadecimal number, e.g. 423423342 or dad4ef
• rgb: a rgb color represented by three parameters for r, g and b, e.g. 128, 128, 128
• rgba: a rgba color represented by three parameters for r, g and b and an additional parameter for the alpha value, e.g. 128, 0, 0, 0.5
• cmyk: a cmyk color represented by four parameters for c, m, y and k, e.g. 0.5, 0.2, 0.9, 0.1
• hsl: a hsl color represented by three parameters for h,s and l, e.g. 360, 0.5, 0.5
• hsv: a hsv color represented by three parameters for h,s and v, e.g. 360, 0.5, 0.5

To savely use the modes use the modes property, like ColorFactory.createColor(ColorFactory.modes.css, 'rgba(11, 22, 33, 1)').

The createColor(mode, a, b, c, d) function just wrapps specific functions to create colors from the certain color scheme, but all the functions return an instance of Color.

An instance of the Color class represents a certain color which may be parsed to hex, rgb, rgba, cmyk, hsl or hsv. Those schemes belong to rules which are

• hex: has to be a 3, 4, 6 or 8 digit hex code
• rgb: rgb accepts floats in a range from 0 to 255. It's rounded to integer by default. See the next paragraph for more information about the precision.
• rgba: like rgb but accepts a fourth float parameter between 0 and 1
• cmyk: accepts four float parameters between 0 and 1
• hsl, hsv: both accept one float parameter in a range from 0 to 360 and two from 0 to 1

While floating values are possible the values are rounded to a certain precision. Rounding is done as little as possible to ensure accuracy. The precisions are set per color scheme and default to

• rgb: 0, integer
• rgba: like rgb but with a precision of two for the alpha value. Therefore alpha is a value between 0 and 1 with two decimal places.
• cmyk: 2, means it defaults to a float with two decimal places
• hsl, hsv: 0 for hue, 2 for the others respectively

Note that when calling a function that parses a color to a certain CSS string the values in a range of 0 to 1 are multiplied by 100, so they default to integers. That means that a color with c = 10%, m = 20%, y = 30%, k = 40% has myColor.getCyan() === 0.1 but toCMYKCSSString() === 'cmyk(10%, 20%, 30%, 40%)'. Further, changing a property may affect the value of other properties.

Use adder functions to add or substract a certain value, e.g.

myColor.addRed(25) // adds 25 red to the the color 
myColor.addGreen(-10) // substracts 10 green from the color

or setters to set the value of a certain property.

myColor.setCyan(0.9) // sets Cyan to 90% 

or get a certain value by

myColor.getSaturation() // returns the saturation of the current color 

You may want to keep a color and calculate a second color on the basis of it. You can use the copy() function to get a exact clone of your color, like so

const myColor2 = myColor.copy() // returns a clone of myColor

API Reference

ColorFactory

Color