blcolor

package
v0.8.3 Latest Latest
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 Go to latest Published: Dec 30, 2025 License: AGPL-3.0 Imports: 7 Imported by: 4

Documentation

Overview

Package blcolor contains color creation and manipulation tools.

Package blcolor contains color creation and manipulation tools.

Package blcolor contains color creation and manipulation tools.

Package blcolor contains color creation and manipulation tools.

Index

Constants

This section is empty.

Variables

View Source 
var (
	Blueviolet           = RGBHex(138, 43, 226)
	Brown                = RGBHex(165, 42, 42)
	Aliceblue            = RGBHex(240, 248, 255)
	Antiquewhite         = RGBHex(250, 235, 215)
	Aqua                 = RGBHex(0, 255, 255)
	Aquamarine           = RGBHex(127, 255, 212)
	Azure                = RGBHex(240, 255, 255)
	Beige                = RGBHex(245, 245, 220)
	Bisque               = RGBHex(255, 228, 196)
	Black                = RGBHex(0, 0, 0)
	Blanchedalmond       = RGBHex(255, 235, 205)
	Blue                 = RGBHex(0, 0, 255)
	Burlywood            = RGBHex(222, 184, 135)
	Cadetblue            = RGBHex(95, 158, 160)
	Chartreuse           = RGBHex(127, 255, 0)
	Chocolate            = RGBHex(210, 105, 30)
	Coral                = RGBHex(255, 127, 80)
	Cornflowerblue       = RGBHex(100, 149, 237)
	Cornsilk             = RGBHex(255, 248, 220)
	Crimson              = RGBHex(220, 20, 60)
	Cyan                 = RGBHex(0, 255, 255)
	Darkblue             = RGBHex(0, 0, 139)
	Darkcyan             = RGBHex(0, 139, 139)
	Darkgoldenrod        = RGBHex(184, 134, 11)
	Darkgray             = RGBHex(169, 169, 169)
	Darkgreen            = RGBHex(0, 100, 0)
	Darkgrey             = RGBHex(169, 169, 169)
	Darkkhaki            = RGBHex(189, 183, 107)
	Darkmagenta          = RGBHex(139, 0, 139)
	Darkolivegreen       = RGBHex(85, 107, 47)
	Darkorange           = RGBHex(255, 140, 0)
	Darkorchid           = RGBHex(153, 50, 204)
	Darkred              = RGBHex(139, 0, 0)
	Darksalmon           = RGBHex(233, 150, 122)
	Darkseagreen         = RGBHex(143, 188, 143)
	Darkslateblue        = RGBHex(72, 61, 139)
	Darkslategray        = RGBHex(47, 79, 79)
	Darkslategrey        = RGBHex(47, 79, 79)
	Darkturquoise        = RGBHex(0, 206, 209)
	Darkviolet           = RGBHex(148, 0, 211)
	Deeppink             = RGBHex(255, 20, 147)
	Deepskyblue          = RGBHex(0, 191, 255)
	Dimgray              = RGBHex(105, 105, 105)
	Dimgrey              = RGBHex(105, 105, 105)
	Dodgerblue           = RGBHex(30, 144, 255)
	Firebrick            = RGBHex(178, 34, 34)
	Floralwhite          = RGBHex(255, 250, 240)
	Forestgreen          = RGBHex(34, 139, 34)
	Fuchsia              = RGBHex(255, 0, 255)
	Gainsboro            = RGBHex(220, 220, 220)
	Ghostwhite           = RGBHex(248, 248, 255)
	Gold                 = RGBHex(255, 215, 0)
	Goldenrod            = RGBHex(218, 165, 32)
	Gray                 = RGBHex(128, 128, 128)
	Green                = RGBHex(0, 128, 0)
	Greenyellow          = RGBHex(173, 255, 47)
	Honeydew             = RGBHex(240, 255, 240)
	Hotpink              = RGBHex(255, 105, 180)
	Indianred            = RGBHex(205, 92, 92)
	Indigo               = RGBHex(75, 0, 130)
	Ivory                = RGBHex(255, 255, 240)
	Khaki                = RGBHex(240, 230, 140)
	Lavender             = RGBHex(230, 230, 250)
	Lavenderblush        = RGBHex(255, 240, 245)
	Lawngreen            = RGBHex(124, 252, 0)
	Lemonchiffon         = RGBHex(255, 250, 205)
	Lightblue            = RGBHex(173, 216, 230)
	Lightcoral           = RGBHex(240, 128, 128)
	Lightcyan            = RGBHex(224, 255, 255)
	Lightgoldenrodyellow = RGBHex(250, 250, 210)
	Lightgray            = RGBHex(211, 211, 211)
	Lightgreen           = RGBHex(144, 238, 144)
	Lightgrey            = RGBHex(211, 211, 211)
	Lightpink            = RGBHex(255, 182, 193)
	Lightsalmon          = RGBHex(255, 160, 122)
	Lightseagreen        = RGBHex(32, 178, 170)
	Lightskyblue         = RGBHex(135, 206, 250)
	Lightslategray       = RGBHex(119, 136, 153)
	Lightslategrey       = RGBHex(119, 136, 153)
	Lightsteelblue       = RGBHex(176, 196, 222)
	Lightyellow          = RGBHex(255, 255, 224)
	Lime                 = RGBHex(0, 255, 0)
	Limegreen            = RGBHex(50, 205, 50)
	Linen                = RGBHex(250, 240, 230)
	Magenta              = RGBHex(255, 0, 255)
	Maroon               = RGBHex(128, 0, 0)
	Mediumaquamarine     = RGBHex(102, 205, 170)
	Mediumblue           = RGBHex(0, 0, 205)
	Mediumorchid         = RGBHex(186, 85, 211)
	Mediumpurple         = RGBHex(147, 112, 219)
	Mediumseagreen       = RGBHex(60, 179, 113)
	Mediumslateblue      = RGBHex(123, 104, 238)
	Mediumspringgreen    = RGBHex(0, 250, 154)
	Mediumturquoise      = RGBHex(72, 209, 204)
	Mediumvioletred      = RGBHex(199, 21, 133)
	Midnightblue         = RGBHex(25, 25, 112)
	Mintcream            = RGBHex(245, 255, 250)
	Mistyrose            = RGBHex(255, 228, 225)
	Moccasin             = RGBHex(255, 228, 181)
	Navajowhite          = RGBHex(255, 222, 173)
	Navy                 = RGBHex(0, 0, 128)
	Oldlace              = RGBHex(253, 245, 230)
	Olive                = RGBHex(128, 128, 0)
	Olivedrab            = RGBHex(107, 142, 35)
	Orange               = RGBHex(255, 165, 0)
	Orangered            = RGBHex(255, 69, 0)
	Orchid               = RGBHex(218, 112, 214)
	Palegoldenrod        = RGBHex(238, 232, 170)
	Palegreen            = RGBHex(152, 251, 152)
	Paleturquoise        = RGBHex(175, 238, 238)
	Palevioletred        = RGBHex(219, 112, 147)
	Papayawhip           = RGBHex(255, 239, 213)
	Peachpuff            = RGBHex(255, 218, 185)
	Peru                 = RGBHex(205, 133, 63)
	Pink                 = RGBHex(255, 192, 203)
	Plum                 = RGBHex(221, 160, 221)
	Powderblue           = RGBHex(176, 224, 230)
	Purple               = RGBHex(128, 0, 128)
	Rebeccapurple        = RGBHex(102, 51, 153)
	Red                  = RGBHex(255, 0, 0)
	Rosybrown            = RGBHex(188, 143, 143)
	Royalblue            = RGBHex(65, 105, 225)
	Saddlebrown          = RGBHex(139, 69, 19)
	Salmon               = RGBHex(250, 128, 114)
	Sandybrown           = RGBHex(244, 164, 96)
	Seagreen             = RGBHex(46, 139, 87)
	Seashell             = RGBHex(255, 245, 238)
	Sienna               = RGBHex(160, 82, 45)
	Silver               = RGBHex(192, 192, 192)
	Skyblue              = RGBHex(135, 206, 235)
	Slateblue            = RGBHex(106, 90, 205)
	Slategray            = RGBHex(112, 128, 144)
	Slategrey            = RGBHex(112, 128, 144)
	Snow                 = RGBHex(255, 250, 250)
	Springgreen          = RGBHex(0, 255, 127)
	Steelblue            = RGBHex(70, 130, 180)
	Tan                  = RGBHex(210, 180, 140)
	Teal                 = RGBHex(0, 128, 128)
	Thistle              = RGBHex(216, 191, 216)
	Tomato               = RGBHex(255, 99, 71)
	Turquoise            = RGBHex(64, 224, 208)
	Violet               = RGBHex(238, 130, 238)
	Wheat                = RGBHex(245, 222, 179)
	White                = RGBHex(255, 255, 255)
	Whitesmoke           = RGBHex(245, 245, 245)
	Yellow               = RGBHex(255, 255, 0)
	Yellowgreen          = RGBHex(154, 205, 50)
)

Named color values

Functions

This section is empty.

Types

type Color 

type Color struct {
	R float64
	G float64
	B float64
	A float64
}

Color holds rgba values for a color.

func CMYK 

func CMYK(c, m, y, k float64) Color

CMYK creates a color struct using cyan, yellow, magenta and black.

func Grey 

func Grey(shade float64) Color

Grey creates a new Color struct with rgb all equal to the same value from 0.0 to 1.0 (a = 1.0).

func GreyHex 

func GreyHex(shade int) Color

GreyHex creates a new Color struct with rgb all equal to the same value from 0 to 255 (a = 1.0).

func HSL 

func HSL(h, s, l float64) Color

HSL creates a Color struct using hue (0.0 - 360.0), value (0.0 - 1.0) and lightness (0.0 - 1.0)

func HSLA 

func HSLA(h, s, l, a float64) Color

HSLA creates a Color struct using hue (0.0 - 360.0), value (0.0 - 1.0), lightness (0.0 - 1.0), and alpha (0.0 - 1.0)

func HSV 

func HSV(h float64, s float64, v float64) Color

HSV creates a Color struct using hue (0.0 - 360.0), value (0.0 - 1.0) and value (0.0 - 1.0) (a = 1.0).

func HSVA 

func HSVA(h float64, s float64, v float64, a float64) Color

HSVA creates a Color struct using hue (0.0 - 360.0), value (0.0 - 1.0), value (0.0 - 1.0) and alpha (0.0 - 1.0).

func Lerp 

func Lerp(colorA, colorB Color, t float64) Color

Lerp creates a new color by interpolating between two other colors

func Number 

func Number(value int) Color

Number creates a new Color struct with a 24-bit int 0xRRGGBB (a = 1.0).

func NumberWithAlpha 

func NumberWithAlpha(value int) Color

NumberWithAlpha creates a new Color struct with a 32-bit int 0xAARRGGBB.

func RGB 

func RGB(r float64, g float64, b float64) Color

RGB creates a new Color struct with rgb values from 0.0 to 1.0 each (a = 1.0).

func RGBA 

func RGBA(r float64, g float64, b float64, a float64) Color

RGBA creates a new Color struct with rgba values from 0.0 to 1.0 each.

func RGBAHex 

func RGBAHex(r int, g int, b int, a int) Color

RGBAHex creates a Color struct with rgba values from 0 to 255 each.

func RGBHex 

func RGBHex(r int, g int, b int) Color

RGBHex creates a Color struct with rgb values from 0 to 255 (a = 255).

func RandomGrey 

func RandomGrey() Color

RandomGrey creates a Color struct with a random grey shade from 0.0 to 1.0 (a = 1.0).

func RandomGreyRange 

func RandomGreyRange(min float64, max float64) Color

RandomGreyRange creates a Color struct with a random grey shade from min to max (a = 1.0).

func RandomHue added in v0.8.3 

func RandomHue() Color

RandomHue creates a color with a random hue, full saturation and value.

func RandomRGB 

func RandomRGB() Color

RandomRGB creates a color struct with random rgb values (a = 1.0).

func (Color) AddColor 

func (c Color) AddColor(b Color) Color

AddColor adds a Color to this Color, returning a new Color.

func (Color) AddRGB 

func (c Color) AddRGB(r, g, b float64) Color

AddRGB adds a value to each channel, returning a new Color.

func (Color) ColorDiff 

func (c Color) ColorDiff(colorB Color) float64

ColorDiff returns the euclidian distance between two colors.

func (Color) ColorDiffPercept 

func (c Color) ColorDiffPercept(colorB Color) float64

ColorDiffPercept returns the euclidian distance between two colors.

func (Color) Contrast 

func (c Color) Contrast(c2 Color) float64

Contrast returns the contrast between this color and another color. ref: https://www.w3.org/TR/2012/NOTE-WCAG20-TECHS-20120103/G17.html

func (Color) Equals 

func (c Color) Equals(colorB Color) bool

Equals returns whether or not this color is equal to another channel.

func (Color) Invert 

func (c Color) Invert() Color

Invert returns a color with the inverted RGB values of the original.

func (Color) Luminance 

func (c Color) Luminance() float64

Luminance returnss the Luminance of a given color

func (Color) Quant 

func (c Color) Quant(quant int) Color

Quant quantizes each color channel into a specified number of bands.

func (Color) Rotate 

func (c Color) Rotate(degrees float64) Color

Rotate returns a color with the hue rotated by the specified amount.

func (Color) Scale 

func (c Color) Scale(mult float64) Color

Scale scales the r, g, b channels by a percent. This will lighten or darken the color. Scale(1.05) will lighten the color by 5% of its current value. Scale(0.95) will darken the color by 5% of its current value. This is virtually the same as getting h, s, l and scaling the l But probably simpler in most cases.

func (Color) ToCMYK 

func (c Color) ToCMYK() (float64, float64, float64, float64)

ToCMYK returns the cyan, magenta, yellow and black of a color.

func (Color) ToGray 

func (c Color) ToGray() Color

ToGray returns a new grayscale color from this color.

func (Color) ToHSL 

func (c Color) ToHSL() (float64, float64, float64)

ToHSL returns the hue, saturation and lightness of a color. hue = 0-360, s = 0-1, l = 0-1

func (Color) ToHSV 

func (c Color) ToHSV() (float64, float64, float64)

ToHSV returns the hue, saturation and value of a color. hue = 0-360, s = 0-1, v = 0-1

type Palette 

type Palette struct {
	// contains filtered or unexported fields
}

Palette is a list of colors.

func AchromaticPalette added in v0.8.3 

func AchromaticPalette(n int) *Palette

AchromaticPalette creates a grayscale palette of n values.

func AnalagousPalette added in v0.8.3 

func AnalagousPalette(c Color) *Palette

AnalagousPalette creates a palette of the given color and two neighbors.

func ComplementaryPalette added in v0.8.3 

func ComplementaryPalette(c Color) *Palette

ComplementaryPalette creates a palette of the given color and its complement.

func MonoPalette added in v0.8.3 

func MonoPalette(hue float64, n int) *Palette

MonoPalette creates a monochrom palette based on the given hue with a range of sat and luminance.

func NewPalette 

func NewPalette() *Palette

NewPalette creates a new palette of the given size

func PastelPalette added in v0.8.3 

func PastelPalette(hue0, hue1 float64, n int) *Palette

PastelPalette creates a light pastel palette interpolated between the two hues.

func RectangularPalette added in v0.8.3 

func RectangularPalette(c Color) *Palette

RectangularPalette creates a four color rectangular palette based on the given color.

func SequentialPalette added in v0.8.3 

func SequentialPalette(colA, colB Color, n int) *Palette

SequentialPalette creates a palette of n colors interpolated between the two given colors.

func SpectralPalette added in v0.8.3 

func SpectralPalette(hue0, hue1 float64, n int) *Palette

SpectralPalette creates a palette of n colors interpolated between the two hues.

func SplitCompPalette added in v0.8.3 

func SplitCompPalette(c Color) *Palette

SplitCompPalette creates a palette with the given color and its two split complements.

func TetradicPalette added in v0.8.3 

func TetradicPalette(c Color) *Palette

TetradicPalette creates a palette with four colors in a square formation based on the given color.

func TriadicPalette added in v0.8.3 

func TriadicPalette(c Color) *Palette

TriadicPalette creates a tetradic paletted based on the given color.

func (*Palette) Add 

func (p *Palette) Add(color Color)

Add adds a color to the palette.

func (*Palette) AddRGB 

func (p *Palette) AddRGB(r, g, b float64)

AddRGB adds a new color defined by the rgb channels.

func (*Palette) AddRGBA 

func (p *Palette) AddRGBA(r, g, b, a float64)

AddRGBA adds a new color defined by the rgb channels.

func (*Palette) Get 

func (p *Palette) Get(index int) Color

Get returns the color at the given index, if available.

func (*Palette) GetRandom 

func (p *Palette) GetRandom() Color

GetRandom returns a random color from the palette.

func (*Palette) Len 

func (p *Palette) Len() int

Len returns the size of the palette (used for sorting).

func (*Palette) Less 

func (p *Palette) Less(i, j int) bool

Less returns if one color has lower luminance another (used for sorting).

func (*Palette) Reverse 

func (p *Palette) Reverse()

Reverse reverses the order of the colors in the palette.

func (*Palette) Size 

func (p *Palette) Size() int

Size returns the number of colors in this palette.

func (*Palette) Sort 

func (p *Palette) Sort()

Sort sorts the palette based on luminance

func (*Palette) SortByHue 

func (p *Palette) SortByHue(offset float64)

SortByHue sorts the palette colors based on their hue.

func (*Palette) Swap 

func (p *Palette) Swap(i, j int)

Swap swaps two colors in the palette (used for sorting).

Source Files

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