Auto.js Pro 9 Docs / color / Color

Class: Color

color.Color

An immutable 32 bit color value in ARGB format.

Table of contents

Constructors

• constructor

Accessors

• alpha
• blue
• green
• opacity
• red
• value

Methods

• equals
• isSimilarTo
• toString
• withAlpha
• withBlue
• withGreen
• withOpacity
• withRed
• fromARGB
• fromGray
• fromRGB
• fromRGBO
• parse

Constructors

constructor

• new Color(value)

Constructs a color from an integer value.

Parameters

Name	Type	Description
value	number	An integer value, formatted as 0xAARRGGBB

Accessors

alpha

• get alpha(): number

The alpha channel of this color in an 8 bit value.

A value of 0 means this color is fully transparent. A value of 255 means this color is fully opaque.

Example

"nodejs";
const { Color } = require('color');
const color = new Color(0xFF000000); // black
console.log(color.alpha); // 255

Returns

number

---

blue

• get blue(): number

The blue channel of this color in an 8 bit value.

Returns

number

---

green

• get green(): number

The green channel of this color in an 8 bit value.

Returns

number

---

opacity

• get opacity(): number

The alpha channel of this color as a floating value.

A value of 0.0 means this color is fully transparent. A value of 1.0 means this color is fully opaque.

Example

"nodejs";
const { Color } = require('color');
const color = new Color(0xFF000000); // black
console.log(color.opacity); // 1.0

Returns

number

---

red

• get red(): number

The red channel of this color in an 8 bit value.

Returns

number

---

value

• get value(): number

A 32 bit value representing this color.

The bits are assigned as follows:

• Bits 24-31 are the alpha value.
• Bits 16-23 are the red value.
• Bits 8-15 are the green value.
• Bits 0-7 are the blue value.

Returns

number

Methods

equals

▸ equals(obj): boolean

Compare two colors is equal, including alpha channel.

Parameters

Name	Type
obj	Color

Returns

boolean

two colors are equal

---

isSimilarTo

▸ isSimilarTo(other, options?): boolean

比较当前颜色是否与另一个颜色相似。

See

CompareColorOptions

Example

"nodejs";
const { Color } = require('color');
const black = new Color(0xFF000000);
const white = Color.parse('#FFFFFF');
const black09 = Color.parse('#090909');
console.log(black.isSimilarTo(white)) // false
console.log(black.isSimilarTo(black09)) // true
console.log(black.isSimilarTo(black09, { threshold: 5 })) // false

Parameters

Name	Type	Description
other	Color	要比较的颜色
options?	CompareColorOptions	比较选项

Returns

boolean

两个颜色是否相似

---

toString

▸ toString(): string

Returns

string

---

withAlpha

▸ withAlpha(a): Color

Returns a new color that matches this color with the alpha channel replaced with a (which ranges from 0 to 255).

Out of range values will have unexpected effects.

Example

"nodejs";
const { Color } = require('color');
const color = new Color(0xFF000000); // black
console.log(color.withAlpha(0x77).toString()) // 0x77000000

Parameters

Name	Type	Description
a	number	alpha channel

Returns

Color

a new color

---

withBlue

▸ withBlue(b): Color

Returns a new color that matches this color with the blue channel replaced with b (which ranges from 0 to 255).

Out of range values will have unexpected effects.

Parameters

Name	Type	Description
b	number	blue channel

Returns

Color

a new color

---

withGreen

▸ withGreen(g): Color

Returns a new color that matches this color with the green channel replaced with g (which ranges from 0 to 255).

Out of range values will have unexpected effects.

Parameters

Name	Type	Description
g	number	green channel

Returns

Color

a new color

---

withOpacity

▸ withOpacity(opacity): Color

Returns a new color that matches this color with the alpha channel replaced with the given opacity (which ranges from 0.0 to 1.0).

Out of range values will have unexpected effects.

Example

"nodejs";
const { Color } = require('color');
const color = new Color(0xFF000000); // black
console.log(color.withOpacity(0.5).toString()) // 0x7F000000

Parameters

Name	Type	Description
opacity	number	opacity value

Returns

Color

a new color

---

withRed

▸ withRed(r): Color

Returns a new color that matches this color with the red channel replaced with r (which ranges from 0 to 255).

Out of range values will have unexpected effects.

Parameters

Name	Type	Description
r	number	red channel

Returns

Color

a new color

---

fromARGB

▸ Static fromARGB(a, r, g, b): Color

Construct a color from the lower 8 bits of four integers.

• a is the alpha value, with 0 being transparent and 255 being fully opaque.
• r is [red], from 0 to 255.
• g is [green], from 0 to 255.
• b is [blue], from 0 to 255.

Out of range values are brought into range using modulo 255.

See

fromRGBO which takes the alpha value as a floating point value.

Example

"nodejs";
const { Color } = require('color');
const red = Color.fromARGB(255, 255, 0, 0);
console.log(red.toString()) // Color(0xFFFF0000)

Parameters

Name	Type	Description
a	number	alpha value
r	number	red value
g	number	green value
b	number	blue value

Returns

Color

a new color

---

fromGray

▸ Static fromGray(gray): Color

Construct a color from a grayscale value. The alpha channel is set to 255, and the R, G, and B channels are set to the same value.

Example

"nodejs";
const { Color } = require('color');
const gray = Color.fromGray(128);
console.log(gray.toString()) // Color(0xFF808080)

Parameters

Name	Type	Description
gray	number	the grayscale value

Returns

Color

a new color

---

fromRGB

▸ Static fromRGB(r, g, b): Color

Construct a color from RGB channels. The alpha channel is set to 255.

Example

"nodejs";
const { Color } = require('color');
const red = Color.fromRGBO(255, 0, 0);
console.log(red.toString()) // Color(0xFFFF0000)

Parameters

Name	Type	Description
r	number	红色通道的值，范围为0-255
g	number	绿色通道的值，范围为0-255
b	number	蓝色通道的值，范围为0-255

Returns

Color

新的颜色对象

---

fromRGBO

▸ Static fromRGBO(r, g, b, opacity): Color

Create a color from red, green, blue, and opacity, similar to rgba() in CSS.

• r is [red], from 0 to 255.
• g is [green], from 0 to 255.
• b is [blue], from 0 to 255.
• opacity is alpha channel of this color as a double, with 0.0 being transparent and 1.0 being fully opaque.

Out of range values are brought into range using modulo 255.

See

fromARGB which takes the opacity as an integer value.

Parameters

Name	Type	Description
r	number	red value
g	number	green value
b	number	blue value
opacity	number	alpha value

Returns

Color

a new color

---

parse

▸ Static parse(color): null | Color

Parse a color from a hex string, such as #RRGGBB or #AARRGGBB.

Example

const { Color } = require('color');
const color = Color.parse('#ff0000');
console.log(color.toString());

Parameters

Name	Type	Description
color	string	颜色字符串，格式为#RRGGBB或#AARRGGBB

Returns

null | Color

新的颜色，或者null