Improved LCH support

LCH_test.go

@@ -0,0 +1,49 @@
+package color_test
+
+import (
+	"fmt"
+	"testing"
+
+	"git.akyoto.dev/go/color"
+)
+
+func TestLCH(t *testing.T) {
+	color.Terminal = true
+
+	lchColors := map[string]color.Color{
+		"black":   color.LCH(0.0, 0.0, 0),
+		"white":   color.LCH(1.0, 0.0, 0),
+		"gray":    color.LCH(0.5, 0.0, 0),
+		"pink":    color.LCH(0.75, 1.0, 0),
+		"red":     color.LCH(0.75, 1.0, 40),
+		"orange":  color.LCH(0.75, 1.0, 60),
+		"yellow":  color.LCH(0.9, 1.0, 100),
+		"green":   color.LCH(0.75, 1.0, 150),
+		"blue":    color.LCH(0.75, 1.0, 260),
+		"cyan":    color.LCH(0.75, 1.0, 210),
+		"magenta": color.LCH(0.75, 1.0, 320),
+	}
+
+	for name, c := range lchColors {
+		testColorRange(t, c)
+		c.Println("█ " + name)
+	}
+}
+
+func TestLCHSpectrum(t *testing.T) {
+	color.Terminal = 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("█")
+			}
+
+			fmt.Println()
+		}
+
+		fmt.Println()
+	}
+}