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Named colors
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+ Rename gradient builder's HexColors() to HtmlColors()
+ Add support for named colors
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@mazznoer
mazznoer authored Aug 7, 2020
1 parent d83cf5a commit a7feb81
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26 changes: 19 additions & 7 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ Fun & easy way to create _color gradient_ / _color scales_ in __Go__ (__Golang__
- [Basic](#basic)
- [Custom Colors](#custom-colors)
- [Hex Colors](#using-hex-colors)
- [Named Colors](#named-colors)
- [Custom Domain](#custom-domain)
- [Blending Mode](#blending-mode)
- [Invalid RGB](#beware-of-invalid-rgb-color)
Expand Down Expand Up @@ -77,31 +78,42 @@ grad, err := colorgrad.NewGradient().

```go
grad, err := colorgrad.NewGradient().
HexColors("#FFD700", "#00BFFF", "#FFD700").
HtmlColors("#FFD700", "#00BFFF", "#FFD700").
Build()
```
![img](img/hex-colors.png)

#### Named Colors

We can also use named colors as defined in the SVG 1.1 spec.

```go
grad, err := colorgrad.NewGradient().
HtmlColors("gold", "hotpink", "darkturquoise").
Build()
```
![img](img/named-colors.png)

#### Custom Domain

```go
grad, err := colorgrad.NewGradient().
HexColors("#DC143C", "#FFD700", "#4682b4").
HtmlColors("#DC143C", "#FFD700", "#4682b4").
Build()
```
![img](img/color-scale-1.png)

```go
grad, err := colorgrad.NewGradient().
HexColors("#DC143C", "#FFD700", "#4682b4").
HtmlColors("#DC143C", "#FFD700", "#4682b4").
Domain(0, 0.35, 1).
Build()
```
![img](img/color-scale-2.png)

```go
grad, err := colorgrad.NewGradient().
HexColors("#DC143C", "#FFD700", "#4682b4").
HtmlColors("#DC143C", "#FFD700", "#4682b4").
Domain(15, 60, 80).
Build()

Expand All @@ -115,7 +127,7 @@ grad.At(80).Hex() // #4682b4

```go
grad, err := colorgrad.NewGradient().
HexColors("#ff0", "#008ae5").
HtmlColors("#ff0", "#008ae5").
Mode(colorgrad.LRGB).
Build()
```
Expand All @@ -126,7 +138,7 @@ Read it [here](https://github.com/lucasb-eyer/go-colorful#blending-colors).

```go
grad, err := colorgrad.NewGradient().
HexColors("#DC143C", "#FFD700", "#4682b4").
HtmlColors("#DC143C", "#FFD700", "#4682b4").
Mode(colorgrad.HCL).
Build()

Expand All @@ -144,7 +156,7 @@ With `Clamped()`

```go
grad1, err := colorgrad.NewGradient().
HexColors("#18dbf4", "#f6ff56").
HtmlColors("#18dbf4", "#f6ff56").
Domain(0, 100).
Build()
```
Expand Down
156 changes: 156 additions & 0 deletions colornames.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,156 @@
package colorgrad

import "image/color"

// Copied from golang.org/x/image/colornames

// Map contains named colors defined in the SVG 1.1 spec.
var colornames = map[string]color.RGBA{
"aliceblue": color.RGBA{0xf0, 0xf8, 0xff, 0xff}, // rgb(240, 248, 255)
"antiquewhite": color.RGBA{0xfa, 0xeb, 0xd7, 0xff}, // rgb(250, 235, 215)
"aqua": color.RGBA{0x00, 0xff, 0xff, 0xff}, // rgb(0, 255, 255)
"aquamarine": color.RGBA{0x7f, 0xff, 0xd4, 0xff}, // rgb(127, 255, 212)
"azure": color.RGBA{0xf0, 0xff, 0xff, 0xff}, // rgb(240, 255, 255)
"beige": color.RGBA{0xf5, 0xf5, 0xdc, 0xff}, // rgb(245, 245, 220)
"bisque": color.RGBA{0xff, 0xe4, 0xc4, 0xff}, // rgb(255, 228, 196)
"black": color.RGBA{0x00, 0x00, 0x00, 0xff}, // rgb(0, 0, 0)
"blanchedalmond": color.RGBA{0xff, 0xeb, 0xcd, 0xff}, // rgb(255, 235, 205)
"blue": color.RGBA{0x00, 0x00, 0xff, 0xff}, // rgb(0, 0, 255)
"blueviolet": color.RGBA{0x8a, 0x2b, 0xe2, 0xff}, // rgb(138, 43, 226)
"brown": color.RGBA{0xa5, 0x2a, 0x2a, 0xff}, // rgb(165, 42, 42)
"burlywood": color.RGBA{0xde, 0xb8, 0x87, 0xff}, // rgb(222, 184, 135)
"cadetblue": color.RGBA{0x5f, 0x9e, 0xa0, 0xff}, // rgb(95, 158, 160)
"chartreuse": color.RGBA{0x7f, 0xff, 0x00, 0xff}, // rgb(127, 255, 0)
"chocolate": color.RGBA{0xd2, 0x69, 0x1e, 0xff}, // rgb(210, 105, 30)
"coral": color.RGBA{0xff, 0x7f, 0x50, 0xff}, // rgb(255, 127, 80)
"cornflowerblue": color.RGBA{0x64, 0x95, 0xed, 0xff}, // rgb(100, 149, 237)
"cornsilk": color.RGBA{0xff, 0xf8, 0xdc, 0xff}, // rgb(255, 248, 220)
"crimson": color.RGBA{0xdc, 0x14, 0x3c, 0xff}, // rgb(220, 20, 60)
"cyan": color.RGBA{0x00, 0xff, 0xff, 0xff}, // rgb(0, 255, 255)
"darkblue": color.RGBA{0x00, 0x00, 0x8b, 0xff}, // rgb(0, 0, 139)
"darkcyan": color.RGBA{0x00, 0x8b, 0x8b, 0xff}, // rgb(0, 139, 139)
"darkgoldenrod": color.RGBA{0xb8, 0x86, 0x0b, 0xff}, // rgb(184, 134, 11)
"darkgray": color.RGBA{0xa9, 0xa9, 0xa9, 0xff}, // rgb(169, 169, 169)
"darkgreen": color.RGBA{0x00, 0x64, 0x00, 0xff}, // rgb(0, 100, 0)
"darkgrey": color.RGBA{0xa9, 0xa9, 0xa9, 0xff}, // rgb(169, 169, 169)
"darkkhaki": color.RGBA{0xbd, 0xb7, 0x6b, 0xff}, // rgb(189, 183, 107)
"darkmagenta": color.RGBA{0x8b, 0x00, 0x8b, 0xff}, // rgb(139, 0, 139)
"darkolivegreen": color.RGBA{0x55, 0x6b, 0x2f, 0xff}, // rgb(85, 107, 47)
"darkorange": color.RGBA{0xff, 0x8c, 0x00, 0xff}, // rgb(255, 140, 0)
"darkorchid": color.RGBA{0x99, 0x32, 0xcc, 0xff}, // rgb(153, 50, 204)
"darkred": color.RGBA{0x8b, 0x00, 0x00, 0xff}, // rgb(139, 0, 0)
"darksalmon": color.RGBA{0xe9, 0x96, 0x7a, 0xff}, // rgb(233, 150, 122)
"darkseagreen": color.RGBA{0x8f, 0xbc, 0x8f, 0xff}, // rgb(143, 188, 143)
"darkslateblue": color.RGBA{0x48, 0x3d, 0x8b, 0xff}, // rgb(72, 61, 139)
"darkslategray": color.RGBA{0x2f, 0x4f, 0x4f, 0xff}, // rgb(47, 79, 79)
"darkslategrey": color.RGBA{0x2f, 0x4f, 0x4f, 0xff}, // rgb(47, 79, 79)
"darkturquoise": color.RGBA{0x00, 0xce, 0xd1, 0xff}, // rgb(0, 206, 209)
"darkviolet": color.RGBA{0x94, 0x00, 0xd3, 0xff}, // rgb(148, 0, 211)
"deeppink": color.RGBA{0xff, 0x14, 0x93, 0xff}, // rgb(255, 20, 147)
"deepskyblue": color.RGBA{0x00, 0xbf, 0xff, 0xff}, // rgb(0, 191, 255)
"dimgray": color.RGBA{0x69, 0x69, 0x69, 0xff}, // rgb(105, 105, 105)
"dimgrey": color.RGBA{0x69, 0x69, 0x69, 0xff}, // rgb(105, 105, 105)
"dodgerblue": color.RGBA{0x1e, 0x90, 0xff, 0xff}, // rgb(30, 144, 255)
"firebrick": color.RGBA{0xb2, 0x22, 0x22, 0xff}, // rgb(178, 34, 34)
"floralwhite": color.RGBA{0xff, 0xfa, 0xf0, 0xff}, // rgb(255, 250, 240)
"forestgreen": color.RGBA{0x22, 0x8b, 0x22, 0xff}, // rgb(34, 139, 34)
"fuchsia": color.RGBA{0xff, 0x00, 0xff, 0xff}, // rgb(255, 0, 255)
"gainsboro": color.RGBA{0xdc, 0xdc, 0xdc, 0xff}, // rgb(220, 220, 220)
"ghostwhite": color.RGBA{0xf8, 0xf8, 0xff, 0xff}, // rgb(248, 248, 255)
"gold": color.RGBA{0xff, 0xd7, 0x00, 0xff}, // rgb(255, 215, 0)
"goldenrod": color.RGBA{0xda, 0xa5, 0x20, 0xff}, // rgb(218, 165, 32)
"gray": color.RGBA{0x80, 0x80, 0x80, 0xff}, // rgb(128, 128, 128)
"green": color.RGBA{0x00, 0x80, 0x00, 0xff}, // rgb(0, 128, 0)
"greenyellow": color.RGBA{0xad, 0xff, 0x2f, 0xff}, // rgb(173, 255, 47)
"grey": color.RGBA{0x80, 0x80, 0x80, 0xff}, // rgb(128, 128, 128)
"honeydew": color.RGBA{0xf0, 0xff, 0xf0, 0xff}, // rgb(240, 255, 240)
"hotpink": color.RGBA{0xff, 0x69, 0xb4, 0xff}, // rgb(255, 105, 180)
"indianred": color.RGBA{0xcd, 0x5c, 0x5c, 0xff}, // rgb(205, 92, 92)
"indigo": color.RGBA{0x4b, 0x00, 0x82, 0xff}, // rgb(75, 0, 130)
"ivory": color.RGBA{0xff, 0xff, 0xf0, 0xff}, // rgb(255, 255, 240)
"khaki": color.RGBA{0xf0, 0xe6, 0x8c, 0xff}, // rgb(240, 230, 140)
"lavender": color.RGBA{0xe6, 0xe6, 0xfa, 0xff}, // rgb(230, 230, 250)
"lavenderblush": color.RGBA{0xff, 0xf0, 0xf5, 0xff}, // rgb(255, 240, 245)
"lawngreen": color.RGBA{0x7c, 0xfc, 0x00, 0xff}, // rgb(124, 252, 0)
"lemonchiffon": color.RGBA{0xff, 0xfa, 0xcd, 0xff}, // rgb(255, 250, 205)
"lightblue": color.RGBA{0xad, 0xd8, 0xe6, 0xff}, // rgb(173, 216, 230)
"lightcoral": color.RGBA{0xf0, 0x80, 0x80, 0xff}, // rgb(240, 128, 128)
"lightcyan": color.RGBA{0xe0, 0xff, 0xff, 0xff}, // rgb(224, 255, 255)
"lightgoldenrodyellow": color.RGBA{0xfa, 0xfa, 0xd2, 0xff}, // rgb(250, 250, 210)
"lightgray": color.RGBA{0xd3, 0xd3, 0xd3, 0xff}, // rgb(211, 211, 211)
"lightgreen": color.RGBA{0x90, 0xee, 0x90, 0xff}, // rgb(144, 238, 144)
"lightgrey": color.RGBA{0xd3, 0xd3, 0xd3, 0xff}, // rgb(211, 211, 211)
"lightpink": color.RGBA{0xff, 0xb6, 0xc1, 0xff}, // rgb(255, 182, 193)
"lightsalmon": color.RGBA{0xff, 0xa0, 0x7a, 0xff}, // rgb(255, 160, 122)
"lightseagreen": color.RGBA{0x20, 0xb2, 0xaa, 0xff}, // rgb(32, 178, 170)
"lightskyblue": color.RGBA{0x87, 0xce, 0xfa, 0xff}, // rgb(135, 206, 250)
"lightslategray": color.RGBA{0x77, 0x88, 0x99, 0xff}, // rgb(119, 136, 153)
"lightslategrey": color.RGBA{0x77, 0x88, 0x99, 0xff}, // rgb(119, 136, 153)
"lightsteelblue": color.RGBA{0xb0, 0xc4, 0xde, 0xff}, // rgb(176, 196, 222)
"lightyellow": color.RGBA{0xff, 0xff, 0xe0, 0xff}, // rgb(255, 255, 224)
"lime": color.RGBA{0x00, 0xff, 0x00, 0xff}, // rgb(0, 255, 0)
"limegreen": color.RGBA{0x32, 0xcd, 0x32, 0xff}, // rgb(50, 205, 50)
"linen": color.RGBA{0xfa, 0xf0, 0xe6, 0xff}, // rgb(250, 240, 230)
"magenta": color.RGBA{0xff, 0x00, 0xff, 0xff}, // rgb(255, 0, 255)
"maroon": color.RGBA{0x80, 0x00, 0x00, 0xff}, // rgb(128, 0, 0)
"mediumaquamarine": color.RGBA{0x66, 0xcd, 0xaa, 0xff}, // rgb(102, 205, 170)
"mediumblue": color.RGBA{0x00, 0x00, 0xcd, 0xff}, // rgb(0, 0, 205)
"mediumorchid": color.RGBA{0xba, 0x55, 0xd3, 0xff}, // rgb(186, 85, 211)
"mediumpurple": color.RGBA{0x93, 0x70, 0xdb, 0xff}, // rgb(147, 112, 219)
"mediumseagreen": color.RGBA{0x3c, 0xb3, 0x71, 0xff}, // rgb(60, 179, 113)
"mediumslateblue": color.RGBA{0x7b, 0x68, 0xee, 0xff}, // rgb(123, 104, 238)
"mediumspringgreen": color.RGBA{0x00, 0xfa, 0x9a, 0xff}, // rgb(0, 250, 154)
"mediumturquoise": color.RGBA{0x48, 0xd1, 0xcc, 0xff}, // rgb(72, 209, 204)
"mediumvioletred": color.RGBA{0xc7, 0x15, 0x85, 0xff}, // rgb(199, 21, 133)
"midnightblue": color.RGBA{0x19, 0x19, 0x70, 0xff}, // rgb(25, 25, 112)
"mintcream": color.RGBA{0xf5, 0xff, 0xfa, 0xff}, // rgb(245, 255, 250)
"mistyrose": color.RGBA{0xff, 0xe4, 0xe1, 0xff}, // rgb(255, 228, 225)
"moccasin": color.RGBA{0xff, 0xe4, 0xb5, 0xff}, // rgb(255, 228, 181)
"navajowhite": color.RGBA{0xff, 0xde, 0xad, 0xff}, // rgb(255, 222, 173)
"navy": color.RGBA{0x00, 0x00, 0x80, 0xff}, // rgb(0, 0, 128)
"oldlace": color.RGBA{0xfd, 0xf5, 0xe6, 0xff}, // rgb(253, 245, 230)
"olive": color.RGBA{0x80, 0x80, 0x00, 0xff}, // rgb(128, 128, 0)
"olivedrab": color.RGBA{0x6b, 0x8e, 0x23, 0xff}, // rgb(107, 142, 35)
"orange": color.RGBA{0xff, 0xa5, 0x00, 0xff}, // rgb(255, 165, 0)
"orangered": color.RGBA{0xff, 0x45, 0x00, 0xff}, // rgb(255, 69, 0)
"orchid": color.RGBA{0xda, 0x70, 0xd6, 0xff}, // rgb(218, 112, 214)
"palegoldenrod": color.RGBA{0xee, 0xe8, 0xaa, 0xff}, // rgb(238, 232, 170)
"palegreen": color.RGBA{0x98, 0xfb, 0x98, 0xff}, // rgb(152, 251, 152)
"paleturquoise": color.RGBA{0xaf, 0xee, 0xee, 0xff}, // rgb(175, 238, 238)
"palevioletred": color.RGBA{0xdb, 0x70, 0x93, 0xff}, // rgb(219, 112, 147)
"papayawhip": color.RGBA{0xff, 0xef, 0xd5, 0xff}, // rgb(255, 239, 213)
"peachpuff": color.RGBA{0xff, 0xda, 0xb9, 0xff}, // rgb(255, 218, 185)
"peru": color.RGBA{0xcd, 0x85, 0x3f, 0xff}, // rgb(205, 133, 63)
"pink": color.RGBA{0xff, 0xc0, 0xcb, 0xff}, // rgb(255, 192, 203)
"plum": color.RGBA{0xdd, 0xa0, 0xdd, 0xff}, // rgb(221, 160, 221)
"powderblue": color.RGBA{0xb0, 0xe0, 0xe6, 0xff}, // rgb(176, 224, 230)
"purple": color.RGBA{0x80, 0x00, 0x80, 0xff}, // rgb(128, 0, 128)
"red": color.RGBA{0xff, 0x00, 0x00, 0xff}, // rgb(255, 0, 0)
"rosybrown": color.RGBA{0xbc, 0x8f, 0x8f, 0xff}, // rgb(188, 143, 143)
"royalblue": color.RGBA{0x41, 0x69, 0xe1, 0xff}, // rgb(65, 105, 225)
"saddlebrown": color.RGBA{0x8b, 0x45, 0x13, 0xff}, // rgb(139, 69, 19)
"salmon": color.RGBA{0xfa, 0x80, 0x72, 0xff}, // rgb(250, 128, 114)
"sandybrown": color.RGBA{0xf4, 0xa4, 0x60, 0xff}, // rgb(244, 164, 96)
"seagreen": color.RGBA{0x2e, 0x8b, 0x57, 0xff}, // rgb(46, 139, 87)
"seashell": color.RGBA{0xff, 0xf5, 0xee, 0xff}, // rgb(255, 245, 238)
"sienna": color.RGBA{0xa0, 0x52, 0x2d, 0xff}, // rgb(160, 82, 45)
"silver": color.RGBA{0xc0, 0xc0, 0xc0, 0xff}, // rgb(192, 192, 192)
"skyblue": color.RGBA{0x87, 0xce, 0xeb, 0xff}, // rgb(135, 206, 235)
"slateblue": color.RGBA{0x6a, 0x5a, 0xcd, 0xff}, // rgb(106, 90, 205)
"slategray": color.RGBA{0x70, 0x80, 0x90, 0xff}, // rgb(112, 128, 144)
"slategrey": color.RGBA{0x70, 0x80, 0x90, 0xff}, // rgb(112, 128, 144)
"snow": color.RGBA{0xff, 0xfa, 0xfa, 0xff}, // rgb(255, 250, 250)
"springgreen": color.RGBA{0x00, 0xff, 0x7f, 0xff}, // rgb(0, 255, 127)
"steelblue": color.RGBA{0x46, 0x82, 0xb4, 0xff}, // rgb(70, 130, 180)
"tan": color.RGBA{0xd2, 0xb4, 0x8c, 0xff}, // rgb(210, 180, 140)
"teal": color.RGBA{0x00, 0x80, 0x80, 0xff}, // rgb(0, 128, 128)
"thistle": color.RGBA{0xd8, 0xbf, 0xd8, 0xff}, // rgb(216, 191, 216)
"tomato": color.RGBA{0xff, 0x63, 0x47, 0xff}, // rgb(255, 99, 71)
"turquoise": color.RGBA{0x40, 0xe0, 0xd0, 0xff}, // rgb(64, 224, 208)
"violet": color.RGBA{0xee, 0x82, 0xee, 0xff}, // rgb(238, 130, 238)
"wheat": color.RGBA{0xf5, 0xde, 0xb3, 0xff}, // rgb(245, 222, 179)
"white": color.RGBA{0xff, 0xff, 0xff, 0xff}, // rgb(255, 255, 255)
"whitesmoke": color.RGBA{0xf5, 0xf5, 0xf5, 0xff}, // rgb(245, 245, 245)
"yellow": color.RGBA{0xff, 0xff, 0x00, 0xff}, // rgb(255, 255, 0)
"yellowgreen": color.RGBA{0x9a, 0xcd, 0x32, 0xff}, // rgb(154, 205, 50)
}
21 changes: 15 additions & 6 deletions grad.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import (
"fmt"
"image/color"
"math"
"strings"

"github.com/lucasb-eyer/go-colorful"
)
Expand Down Expand Up @@ -49,15 +50,23 @@ func (gb *GradientBuilder) Colors(colors ...color.Color) *GradientBuilder {
return gb
}

func (gb *GradientBuilder) HexColors(hexColors ...string) *GradientBuilder {
func (gb *GradientBuilder) HtmlColors(htmlColors ...string) *GradientBuilder {
colors := []colorful.Color{}

for _, v := range hexColors {
c, err := colorful.Hex(v)
if err != nil {
continue
for _, v := range htmlColors {
var col colorful.Color
c1, ok := colornames[strings.ToLower(v)]
if ok {
c, _ := colorful.MakeColor(c1)
col = c
} else {
c, err := colorful.Hex(v)
if err != nil {
continue
}
col = c
}
colors = append(colors, c)
colors = append(colors, col)
}
gb.colors = colors
return gb
Expand Down
30 changes: 20 additions & 10 deletions grad_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ func TestBasic1(t *testing.T) {

// Domain's length != colors's length
grad, err = NewGradient().
HexColors("#777", "#fff", "#ccc").
HtmlColors("#777", "#fff", "#ccc").
Domain(0, 1).
Build()
if err == nil {
Expand All @@ -28,7 +28,7 @@ func TestBasic1(t *testing.T) {

// Wrong domain
grad, err = NewGradient().
HexColors("#777", "#fff", "#ccc", "#222").
HtmlColors("#777", "#fff", "#ccc", "#222").
Domain(0, 0.71, 0.70, 1).
Build()
if err == nil {
Expand All @@ -40,42 +40,52 @@ func TestBasic1(t *testing.T) {

// Invalid hex color
grad, err = NewGradient().
HexColors("#ffg", "#333", "#bbb").
HtmlColors("#ffg", "#333", "#bbb").
Build()
testStr(t, grad.At(0).Hex(), "#333333")
testStr(t, grad.At(1).Hex(), "#bbbbbb")

// Named colors
grad, err = NewGradient().
HtmlColors("tomato", "skyblue", "gold", "springgreen").
Build()
colors := grad.Colors(4)
testStr(t, colors[0].Hex(), "#ff6347")
testStr(t, colors[1].Hex(), "#87ceeb")
testStr(t, colors[2].Hex(), "#ffd700")
testStr(t, colors[3].Hex(), "#00ff7f")

// Blend mode
grad, err = NewGradient().
HexColors("#333", "#bbb").
HtmlColors("#333", "#bbb").
Mode(HCL).
Build()
testStr(t, grad.At(0).Hex(), "#333333")
testStr(t, grad.At(1).Hex(), "#bbbbbb")

grad, err = NewGradient().
HexColors("#333", "#bbb").
HtmlColors("#333", "#bbb").
Mode(HSV).
Build()
testStr(t, grad.At(0).Hex(), "#333333")
testStr(t, grad.At(1).Hex(), "#bbbbbb")

grad, err = NewGradient().
HexColors("#333", "#bbb").
HtmlColors("#333", "#bbb").
Mode(LAB).
Build()
testStr(t, grad.At(0).Hex(), "#333333")
testStr(t, grad.At(1).Hex(), "#bbbbbb")

grad, err = NewGradient().
HexColors("#333", "#bbb").
HtmlColors("#333", "#bbb").
Mode(LRGB).
Build()
testStr(t, grad.At(0).Hex(), "#333333")
testStr(t, grad.At(1).Hex(), "#bbbbbb")

grad, err = NewGradient().
HexColors("#333", "#bbb").
HtmlColors("#333", "#bbb").
Mode(LUV).
Build()
testStr(t, grad.At(0).Hex(), "#333333")
Expand Down Expand Up @@ -115,7 +125,7 @@ func TestBasic2(t *testing.T) {

func TestDomain(t *testing.T) {
grad, _ := NewGradient().
HexColors("#00ff00", "#ff0000", "#ffff00").
HtmlColors("#00ff00", "#ff0000", "#ffff00").
Domain(0, 0.75, 1).
Build()

Expand All @@ -128,7 +138,7 @@ func TestDomain(t *testing.T) {
testStr(t, grad.At(1.5).Hex(), "#ffff00")

grad, _ = NewGradient().
HexColors("#00ff00", "#ff0000", "#0000ff", "#ffff00").
HtmlColors("#00ff00", "#ff0000", "#0000ff", "#ffff00").
Domain(15, 25, 29, 63).
Build()

Expand Down
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