Color | API Reference | ArcGIS Maps SDK for JavaScript 4.31

Creates a new color object by passing either a hex, rgb(a), hsl(a) or named color value. Hex, hsl(a) and named color values can be passed as a string:

// Examples for green
let color = new Color("lime");  // named value
let color = new Color("#0f0");  // shortened three digit hexadecimal value
let color = new Color("#00ff00");  // six digit hexadecimal value
let color = new Color("hsl(120, 100%, 50%)");  // hsl
let color = new Color("hsla(120, 100%, 50%, 0.5)"); // hsla

RGB values can be passed in as either an array, a string or an object:

// Examples for green
let color = new Color([0, 255, 0]);
let color = new Color([0, 255, 0, 0.5]);
let color = new Color("rgb(0, 255, 0)");
let color = new Color("rgba(0, 255, 0, 0.5)");
let color = new Color({r: 0, g: 255, b: 0});
let color = new Color({r: 0, g: 255, b: 0, a: 0.5});

The alpha-channel (opacity) in rgba and hsla can have a value between 0.0 (fully transparent) and 1.0 (fully opaque).

See also

Constructors

Color Constructor new Color(color)

Parameter

color String|Number []|Object

The color to create. This parameter can be a string representing a named color or a hex value; an array of three or four numbers representing r, g, b, a values; or an object with r, g, b, a properties.

Example

// Creates a green Color object using a named value
let color = new Color("green");

// Creates a green Color object using a hex value
let color = new Color("#00ff00");

// Creates a new Color object using an array of r, g, b values
let color = new Color([125, 255, 13]);

// Add a fourth value to the array to add opacity (range between 0 and 1)
let color = new Color([125, 255, 13, 0.5]);

// Creates a new Color object using an object
let color = new Color({
  r: 125,
  g: 255,
  b: 13,
  a: 0.3  // Optional
});

Property Overview

Type	Summary	Class
Number	The alpha value.	Color
Number	The blue value.	Color
Number	The green value.	Color
Number	The red value.	Color

Property Details

a Property a Number

The alpha value. This value can be any number between 0 and 1 and represents the opacity of the Color. 0 indicates the color is fully transparent and 1 indicates it is fully opaque.

b Property b Number

The blue value. This value can range between 0 and 255.

g Property g Number

The green value. This value can range between 0 and 255.

r Property r Number

The red value. This value can range between 0 and 255.

Method Overview

Return Type	Summary	Class
Color	Creates a Color instance by blending two colors using a weight factor.	Color
Color	Creates a deep clone of the Color instance.	Color
Color	Creates a Color instance using a 3 or 4 element array, mapping each element in sequence to the rgb(a) values of the color.	Color
Color	Creates a Color from hexadecimal string.	Color
Color	Creates a new Color instance, and initializes it with values from a JSON object.	Color
Color	Creates a Color instance from a string of the form "rgb()" or "rgba()".	Color
Color	Creates a Color instance by parsing a generic string.	Color
Color	Takes an array of rgb(a) values, named string, hex string or an hsl(a) string, an object with `r`, `g`, `b`, and `a` properties, or a Color object and sets this color instance to the input value.	Color
String	Returns a CSS color string in rgba form representing the Color instance.	Color
String	Returns the color in hexadecimal format.	Color
Object	Returns a JSON object with all the values from a Color instance.	Color
Number []	Returns a 3-component array of rgb values that represent the Color instance.	Color
Number []	Returns a 4-component array of rgba values that represent the Color instance.	Color

Method Details

blendColors Method blendColors(start, end, weight, out){Color}static

Creates a Color instance by blending two colors using a weight factor. Optionally accepts a Color object to update and return instead of creating a new object.

Parameters

start Color

The start color.

end Color

The end color.

weight Number

The weight value is a number from 0 to 1, with 0.5 being a 50/50 blend.

out Color

optional

A previously allocated Color object to reuse for the result.

Returns

Type	Description
Color	Returns a new Color object.

Example

const startColor = new Color("#0000ff");
const endColor = new Color("#ca0013");
const blendedColor = Color.blendColors(startColor, endColor, 0.5);

clone Method clone(){Color}

Creates a deep clone of the Color instance.

Returns

Type	Description
Color	A deep clone of the Color instance.

Example

// Creates a deep clone of the graphic's color
let colorClone = graphic.symbol.color.clone();

fromArray Method fromArray(a, t){Color}static

Creates a Color instance using a 3 or 4 element array, mapping each element in sequence to the rgb(a) values of the color. Optionally accepts a Color object to update with the color value and return instead of creating a new object.

Parameters

a Number []

The input array.

t Color

optional

A previously allocated Color object to reuse for the result.

Returns

Type	Description
Color	Returns a new Color object.

Example

let redColor = Color.fromArray([201, 0, 19]);

fromHex Method fromHex(hex, color){Color}static

Creates a Color from hexadecimal string.

Colors can be expressed as:

Hex triplet, a six or eight digit hexadecimal number. For example:
- "#ffff00" for Yellow, or
- "#dc143c20" for a semi-transparent Crimson
Shorthand variant, a three or four digit hexadecimal number. For example:
- "#F0F" for Fuchsia, or
- "#FFF8" for semi-transparent white

Hexadecimal numbers must be prefixed with the number (or "hash") sign (#). Strings can be upper or lower case.

This static method returns a new Color object. Optionally the method accepts an existing color instance that is updated and returned.

Parameters

hex String

The input color in a hexadecimal string.

color Color

optional

A previously allocated Color object to reuse for the result.

Returns

Type	Description
Color	Returns a new Color object or updated color object (if parsed).

Example

const red = Color.fromHex("#ff0000");     // Color from hex triplet
const blue = Color.fromHex("#00F");       // Color from hex shorthand
const green = Color.fromHex("#00ff0080"); // Color with 50% transparency

fromJSON Method fromJSON(json){Color}static

Creates a new Color instance, and initializes it with values from a JSON object.

Parameter

json Object

A JSON representation of the instance.

Returns

Type	Description
Color	A new Color instance.

fromRgb Method fromRgb(color, out){Color}static

Creates a Color instance from a string of the form "rgb()" or "rgba()". Optionally accepts a Color object to update with the parsed value and return instead of creating a new object.

Parameters

color String

The input color in a string of the form "rgb()" or "rgba()".

out Color

optional

A previously allocated Color object to reuse for the result.

Returns

Type	Description
Color	Returns a new Color object.

Example

const redColor = Color.fromRgb("rgb(202,0,19)");

fromString Method fromString(str, obj){Color}static

Creates a Color instance by parsing a generic string. Accepts hex, rgb, and rgba style color values. Optionally accepts a Color object to update with the parsed value and return instead of creating a new object.

Parameters

str String

The input value.

obj Color

optional

A previously allocated Color object to reuse for the result.

Returns

Type	Description
Color	Returns a new Color object.

Example

let blueColor = Color.fromString("blue");

setColor Method setColor(color){Color}

Takes an array of rgb(a) values, named string, hex string or an hsl(a) string, an object with r, g, b, and a properties, or a Color object and sets this color instance to the input value.

Parameter

color String|Number []|Object

The new color value. This parameter can be a string representing a named color or a hex value; an array of three or four numbers representing r, g, b, a values; or an object with r, g, b, a properties.

Returns

Type	Description
Color	Sets the Color instance used to call this method to the new color.

toCss Method toCss(includeAlpha){String}

Returns a CSS color string in rgba form representing the Color instance.

Parameter

includeAlpha Boolean

optional

If true, the alpha value will be included in the result.

Returns

Type	Description
String	A CSS color string in rgba form that represents the Color instance used to call this method.

toHex Method toHex(options){String}

Returns the color in hexadecimal format.

Parameters

Specification

options Object

optional

Additional options.

Specification

capitalize Boolean

optional

Default Value: false

When true, the hexadecimal number will be capitalized.

digits Number

optional

Default Value: 6

The intended size of the output hexadecimal number. Valid values are 3, 4, 6 and 8. The default value is 6. Values 3 and 4 represent the shortened variant. Values 4 and 8 include an alpha channel.

Returns

Type	Description
String	A three, four, six or eight-digit hexadecimal number.

See also

RGB Hexadecimal Notations

Example

// Three digit notation
const hex = Color.fromString("red").toHex({ digits: 3 });                   // returns "#f00"
const hex = Color.fromString("red").toHex({ digits: 3, capitalize: true }); // returns "#F00"

// Four digit notation
const hex = Color.fromString("red").toHex({ digits: 4 });                   // returns "#f00f"
const hex = Color.fromString("red").toHex({ digits: 4, capitalize: true }); // returns "#F00F"

// Six digit notation
const hex = Color.fromString("red").toHex({ digits: 6 });                   // returns "#ff0000"
const hex = Color.fromString("red").toHex({ digits: 6, capitalize: true }); // returns "#ff0000"

// Eight digit notation
const hex = Color.fromString("red").toHex({ digits: 8 });                   // returns "#ff0000ff"
const hex = Color.fromString("red").toHex({ digits: 8, capitalize: true }); // returns "#ff0000ff"

toJSON Method toJSON(){Object}

Returns a JSON object with all the values from a Color instance.

Returns

Type	Description
Object	A JSON representation of the Color instance.

toRgb Method toRgb(){Number[]}

Returns a 3-component array of rgb values that represent the Color instance.

Returns

Type	Description
Number []	A 3-component array of rgb values.

toRgba Method toRgba(){Number[]}

Returns a 4-component array of rgba values that represent the Color instance.

Returns

Type	Description
Number []	A 4-component array of rgba values.