Added OKLCH color space

Color_test.go

@@ -1,6 +1,7 @@
 package color_test
 
 import (
+	"fmt"
 	"io"
 	"testing"
 
@@ -8,36 +9,73 @@ import (
 	"git.akyoto.dev/go/color"
 )
 
-func TestColors(t *testing.T) {
-	color.Terminal = true
-	testColors(t)
-}
-
 func TestNoColors(t *testing.T) {
 	color.Terminal = false
-	testColors(t)
+	testRGBColors(t)
+	testLCHColors(t)
 }
 
-func testColors(t *testing.T) {
-	colors := map[string]color.Color{
-		"black": color.RGB(0.0, 0.0, 0.0),
-		"white": color.RGB(1.0, 1.0, 1.0),
-		"red":   color.RGB(1.0, 0.0, 0.0),
-		"green": color.RGB(0.0, 1.0, 0.0),
-		"blue":  color.RGB(0.0, 0.0, 1.0),
-	}
+func TestColors(t *testing.T) {
+	color.Terminal = true
+	testRGBColors(t)
+	testLCHColors(t)
+}
 
-	for name, value := range colors {
-		assert.True(t, value.R >= 0.0)
-		assert.True(t, value.G >= 0.0)
-		assert.True(t, value.B >= 0.0)
+func TestRainbow(t *testing.T) {
+	color.Terminal = true
 
-		assert.True(t, value.R <= 1.0)
-		assert.True(t, value.G <= 1.0)
-		assert.True(t, value.B <= 1.0)
+	for chroma := range 5 {
+		for lightness := range 21 {
+			for hue := range 80 {
+				c := color.LCH(color.Value(lightness)*0.05, color.Value(chroma)*0.05, color.Value(hue)*4.5)
+				c.Print("█")
+			}
 
-		value.Fprint(io.Discard, name)
-		value.Print(name)
-		value.Println(name)
+			fmt.Println()
+		}
+
+		fmt.Println()
 	}
 }
+
+func testRGBColors(t *testing.T) {
+	rgbColors := map[string]color.Color{
+		"RGB.black": color.RGB(0.0, 0.0, 0.0),
+		"RGB.white": color.RGB(1.0, 1.0, 1.0),
+		"RGB.red":   color.RGB(1.0, 0.0, 0.0),
+		"RGB.green": color.RGB(0.0, 1.0, 0.0),
+		"RGB.blue":  color.RGB(0.0, 0.0, 1.0),
+	}
+
+	for name, c := range rgbColors {
+		testColor(t, c, name)
+	}
+}
+
+func testLCHColors(t *testing.T) {
+	lchColors := map[string]color.Color{
+		"LCH.black": color.LCH(0.0, 0.0, 0.0),
+		"LCH.white": color.LCH(1.0, 0.0, 0.0),
+		"LCH.red":   color.LCH(0.6, 0.5, 20.0),
+		"LCH.green": color.LCH(0.6, 0.5, 161.0),
+		"LCH.blue":  color.LCH(0.6, 0.5, 240.0),
+	}
+
+	for name, c := range lchColors {
+		testColor(t, c, name)
+	}
+}
+
+func testColor(t *testing.T, c color.Color, name string) {
+	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)
+
+	c.Fprint(io.Discard, name)
+	c.Print(name)
+	c.Println(name)
+}