go/color
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Added HSL and HSV colors

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This commit is contained in:
Eduard Urbach
2025-03-11 14:24:41 +01:00
parent 1b0b4cb28f
commit f75ff8da5a
14 changed files with 153 additions and 48 deletions
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8
Benchmarks_test.go
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@ -7,13 +7,13 @@ import (
)
func BenchmarkRGB(b *testing.B) {
for i := 0; i < b.N; i++ {
for b.Loop() {
color.RGB(1.0, 1.0, 1.0)
}
}
func BenchmarkLCH(b *testing.B) {
for i := 0; i < b.N; i++ {
for b.Loop() {
color.LCH(0.5, 0.5, 0.0)
}
}
@ -22,7 +22,7 @@ func BenchmarkPrint(b *testing.B) {
color.Terminal = true
c := color.RGB(1.0, 1.0, 1.0)
for i := 0; i < b.N; i++ {
for b.Loop() {
c.Print("")
}
}
@ -31,7 +31,7 @@ func BenchmarkPrintRaw(b *testing.B) {
color.Terminal = false
c := color.RGB(1.0, 1.0, 1.0)
for i := 0; i < b.N; i++ {
for b.Loop() {
c.Print("")
}
}

14
Color.go
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@ -4,11 +4,11 @@ import (
"fmt"
)
// Color represents an RGB color.
// Color represents an sRGB color.
type Color struct {
R Value
G Value
B Value
R byte
G byte
B byte
}
// Print writes the text in the given color to standard output.
@ -18,7 +18,7 @@ func (c Color) Print(args ...any) {
return
}
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\x1b[0m", byte(c.R*255), byte(c.G*255), byte(c.B*255), fmt.Sprint(args...))
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\x1b[0m", c.R, c.G, c.B, fmt.Sprint(args...))
}
// Printf formats according to a format specifier and writes the text in the given color to standard output.
@ -28,7 +28,7 @@ func (c Color) Printf(format string, args ...any) {
return
}
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\x1b[0m", byte(c.R*255), byte(c.G*255), byte(c.B*255), fmt.Sprintf(format, args...))
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\x1b[0m", c.R, c.G, c.B, fmt.Sprintf(format, args...))
}
// Println writes the text in the given color to standard output and appends a newline.
@ -38,5 +38,5 @@ func (c Color) Println(args ...any) {
return
}
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\n\x1b[0m", byte(c.R*255), byte(c.G*255), byte(c.B*255), fmt.Sprint(args...))
fmt.Printf("\x1b[38;2;%d;%d;%dm%s\n\x1b[0m", c.R, c.G, c.B, fmt.Sprint(args...))
}

6
Color_test.go
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@ -8,12 +8,14 @@ import (
func TestPrint(t *testing.T) {
color.Terminal = true
color.TrueColor = true
color.RGB(1, 0, 0).Print("red\n")
color.RGB(0, 1, 0).Print("green\n")
color.RGB(0, 0, 1).Print("blue\n")
color.Terminal = false
color.TrueColor = false
color.RGB(1, 0, 0).Print("red\n")
color.RGB(0, 1, 0).Print("green\n")
@ -22,12 +24,14 @@ func TestPrint(t *testing.T) {
func TestPrintf(t *testing.T) {
color.Terminal = true
color.TrueColor = true
color.RGB(1, 0, 0).Printf("%s\n", "red")
color.RGB(0, 1, 0).Printf("%s\n", "green")
color.RGB(0, 0, 1).Printf("%s\n", "blue")
color.Terminal = false
color.TrueColor = false
color.RGB(1, 0, 0).Printf("%s\n", "red")
color.RGB(0, 1, 0).Printf("%s\n", "green")
@ -36,12 +40,14 @@ func TestPrintf(t *testing.T) {
func TestPrintln(t *testing.T) {
color.Terminal = true
color.TrueColor = true
color.RGB(1, 0, 0).Println("red")
color.RGB(0, 1, 0).Println("green")
color.RGB(0, 0, 1).Println("blue")
color.Terminal = false
color.TrueColor = false
color.RGB(1, 0, 0).Println("red")
color.RGB(0, 1, 0).Println("green")

29
HSL.go Normal file
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@ -0,0 +1,29 @@
package color
import "math"
// HSL represents a color using hue, saturation and lightness.
func HSL(hue Value, saturation Value, lightness Value) Color {
hue = math.Mod(hue, 360)
c := (1 - math.Abs(2*lightness-1)) * saturation
x := c * (1 - math.Abs(math.Mod(hue/60, 2)-1))
var r, g, b Value
switch {
case hue >= 0 && hue < 60:
r, g, b = c, x, 0
case hue >= 60 && hue < 120:
r, g, b = x, c, 0
case hue >= 120 && hue < 180:
r, g, b = 0, c, x
case hue >= 180 && hue < 240:
r, g, b = 0, x, c
case hue >= 240 && hue < 300:
r, g, b = x, 0, c
case hue >= 300 && hue < 360:
r, g, b = c, 0, x
}
m := lightness - c/2
return RGB(r+m, g+m, b+m)
}

26
HSL_test.go Normal file
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@ -0,0 +1,26 @@
package color_test
import (
"fmt"
"testing"
"git.urbach.dev/go/color"
)
func TestHSLSpectrum(t *testing.T) {
color.Terminal = true
color.TrueColor = true
for lightness := range 21 {
for hue := range 80 {
h := color.Value(hue) * 4.4
s := color.Value(1.0)
l := color.Value(lightness) * 0.05
c := color.HSL(h, s, l)
c.Print("█")
}
fmt.Println()
}
}

29
HSV.go Normal file
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@ -0,0 +1,29 @@
package color
import "math"
// HSV represents a color using hue, saturation and value.
func HSV(hue Value, saturation Value, value Value) Color {
hue = math.Mod(hue, 360)
c := value * saturation
x := c * (1 - math.Abs(math.Mod(hue/60, 2)-1))
var r, g, b Value
switch {
case hue >= 0 && hue < 60:
r, g, b = c, x, 0
case hue >= 60 && hue < 120:
r, g, b = x, c, 0
case hue >= 120 && hue < 180:
r, g, b = 0, c, x
case hue >= 180 && hue < 240:
r, g, b = 0, x, c
case hue >= 240 && hue < 300:
r, g, b = x, 0, c
case hue >= 300 && hue < 360:
r, g, b = c, 0, x
}
m := value - c
return RGB(r+m, g+m, b+m)
}

26
HSV_test.go Normal file
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@ -0,0 +1,26 @@
package color_test
import (
"fmt"
"testing"
"git.urbach.dev/go/color"
)
func TestHSVSpectrum(t *testing.T) {
color.Terminal = true
color.TrueColor = true
for value := range 21 {
for hue := range 80 {
h := color.Value(hue) * 4.4
s := color.Value(1.0)
v := color.Value(value) * 0.05
c := color.HSV(h, s, v)
c.Print("█")
}
fmt.Println()
}
}

7
LCH.go
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@ -19,12 +19,7 @@ func LCH(lightness Value, chroma Value, hue Value) Color {
b *= chroma
r, g, b := oklabToLinearRGB(lightness, a, b)
r = sRGB(r)
g = sRGB(g)
b = sRGB(b)
return Color{r, g, b}
return RGB(r, g, b)
}
// findChromaInSRGB tries to find the closest chroma that can be represented in sRGB color space.

10
LCH_test.go
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@ -25,20 +25,22 @@ func TestLCH(t *testing.T) {
}
for name, c := range lchColors {
testColorRange(t, c)
c.Println("█ " + name)
}
}
func TestLCHSpectrum(t *testing.T) {
color.Terminal = true
color.TrueColor = true
for chroma := range 4 {
for lightness := range 21 {
for hue := range 80 {
c := color.LCH(color.Value(lightness)*0.05, color.Value(chroma)*0.05, color.Value(hue)*4.4)
testColorRange(t, c)
c.Print("█")
l := color.Value(lightness) * 0.05
c := color.Value(chroma) * 0.05
h := color.Value(hue) * 4.4
col := color.LCH(l, c, h)
col.Print("█")
}
fmt.Println()

12
README.md
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@ -5,6 +5,8 @@ Adds color to your terminal output.
## Features
- ANSI colors
- HSL colors
- HSV colors
- LCH colors
- RGB colors
@ -35,6 +37,8 @@ blue.Println("blue text")
PASS: TestPrint
PASS: TestPrintf
PASS: TestPrintln
PASS: TestHSLSpectrum
PASS: TestHSVSpectrum
PASS: TestLCH
PASS: TestLCHSpectrum
PASS: TestRGB
@ -44,10 +48,10 @@ coverage: 100.0% of statements
## Benchmarks
```
BenchmarkRGB-12 1000000000 0.3141 ns/op 0 B/op 0 allocs/op
BenchmarkLCH-12 4780176 250.9 ns/op 0 B/op 0 allocs/op
BenchmarkPrint-12 375394 3343 ns/op 0 B/op 0 allocs/op
BenchmarkPrintRaw-12 3105022 387.3 ns/op 0 B/op 0 allocs/op
BenchmarkRGB-20 100000000 14.88 ns/op 0 B/op 0 allocs/op
BenchmarkLCH-20 5075756 227.8 ns/op 0 B/op 0 allocs/op
BenchmarkPrint-20 1587134 755.5 ns/op 0 B/op 0 allocs/op
BenchmarkPrintRaw-20 3166090 361.5 ns/op 0 B/op 0 allocs/op
```
## License

8
RGB.go
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@ -2,9 +2,13 @@ package color
import "math"
// RGB creates a new color with red, green and blue values in the range of 0.0 to 1.0.
// RGB creates a new sRGB color.
func RGB(r Value, g Value, b Value) Color {
return Color{r, g, b}
return Color{
byte(sRGB(r) * 255),
byte(sRGB(g) * 255),
byte(sRGB(b) * 255),
}
}
// inSRGB indicates whether the given color can be mapped to the sRGB color space.

13
RGB_test.go
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@ -3,12 +3,12 @@ package color_test
import (
"testing"
"git.urbach.dev/go/assert"
"git.urbach.dev/go/color"
)
func TestRGB(t *testing.T) {
color.Terminal = true
color.TrueColor = true
rgbColors := map[string]color.Color{
"black": color.RGB(0, 0, 0),
@ -24,17 +24,6 @@ func TestRGB(t *testing.T) {
}
for name, c := range rgbColors {
testColorRange(t, c)
c.Println("█ " + name)
}
}
func testColorRange(t *testing.T, c color.Color) {
assert.True(t, c.R >= 0.0)
assert.True(t, c.G >= 0.0)
assert.True(t, c.B >= 0.0)
assert.True(t, c.R <= 1.0)
assert.True(t, c.G <= 1.0)
assert.True(t, c.B <= 1.0)
}

5
go.mod
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@ -2,7 +2,4 @@ module git.urbach.dev/go/color
go 1.24
require (
git.urbach.dev/go/assert v0.0.0-20250225153414-fc1f84f19edf
golang.org/x/sys v0.30.0
)
require golang.org/x/sys v0.31.0

6
go.sum
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@ -1,4 +1,2 @@
git.urbach.dev/go/assert v0.0.0-20250225153414-fc1f84f19edf h1:BQWa5GKNUsA5CSUa/+UlFWYCEVe3IDDKRbVqBLK0mAE=
git.urbach.dev/go/assert v0.0.0-20250225153414-fc1f84f19edf/go.mod h1:y9jGII9JFiF1HNIju0u87OyPCt82xKCtqnAFyEreCDo=
golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=