add color conversion in parse and rgb to ui state.

internal/color/color.go

@@ -126,6 +126,14 @@ func (col *Color) ToRGB() (col2 Color, ok bool) {
 		ok = true
 	}
 
+	if ok {
+		col2 = Color{RGB: &RGB{
+			Red:   math.Max(col2.RGB.Red, 0.0),
+			Green: math.Max(col2.RGB.Green, 0.0),
+			Blue:  math.Max(col2.RGB.Blue, 0.0),
+		}}
+	}
+
 	return
 }
 
@@ -309,7 +317,9 @@ func Parse(raw string) (col Color, err error) {
 		return
 	}
 
-	tokens := strings.SplitN(raw, ":", 2)
+	convertTokens := strings.SplitN(raw, "|", 2)
+
+	tokens := strings.SplitN(convertTokens[0], ":", 2)
 	if len(tokens) != 2 {
 		err = ErrBadColorInput
 		return
@@ -434,6 +444,34 @@ func Parse(raw string) (col Color, err error) {
 		err = ErrUnknownColorFormat
 	}
 
+	if err == nil && len(convertTokens) == 2 {
+		switch convertTokens[1] {
+		case "xy":
+			col2, ok := col.ToXY()
+			if !ok {
+				err = ErrUnknownColorFormat
+			} else {
+				col = col2
+			}
+		case "rgb":
+			col2, ok := col.ToRGB()
+			if !ok {
+				err = ErrUnknownColorFormat
+			} else {
+				col = col2
+			}
+		case "hs":
+			col2, ok := col.ToHS()
+			if !ok {
+				err = ErrUnknownColorFormat
+			} else {
+				col = col2
+			}
+		default:
+			err = ErrUnknownColorFormat
+		}
+	}
+
 	return
 }
 

internal/color/rgb.go

@@ -1,6 +1,9 @@
 package color
 
-import "github.com/lucasb-eyer/go-colorful"
+import (
+	"github.com/lucasb-eyer/go-colorful"
+	"math"
+)
 
 type RGB struct {
 	Red   float64 `json:"red"`
@@ -36,6 +39,14 @@ func (rgb RGB) ToXY() XY {
 	}
 }
 
+func (rgb RGB) Round() RGB {
+	return RGB{
+		Red:   math.Max(math.Round(rgb.Red*1000)/1000, 0),
+		Green: math.Max(math.Round(rgb.Green*1000)/1000, 0),
+		Blue:  math.Max(math.Round(rgb.Blue*1000)/1000, 0),
+	}
+}
+
 func (rgb RGB) Normalize() (RGB, float64) {
 	hue, sat, value := colorful.Color{R: rgb.Red, G: rgb.Green, B: rgb.Blue}.Hsv()
 	hs := HueSat{Hue: hue, Sat: sat}

internal/color/xy.go

@@ -162,13 +162,13 @@ type XY struct {
 
 func (xy XY) ToRGB() RGB {
 	h, s, _ := colorful.Xyy(xy.X, xy.Y, 0.5).Hsv()
-	c := colorful.Hsv(h, s, 1)
+	c := colorful.Hsv(math.Mod(h, 360), s, 1)
 	return RGB{Red: c.R, Green: c.G, Blue: c.B}
 }
 
 func (xy XY) ToHS() HueSat {
 	h, s, _ := colorful.Xyy(xy.X, xy.Y, 0.5).Hsv()
-	return HueSat{Hue: h, Sat: s}
+	return HueSat{Hue: math.Mod(h, 360), Sat: s}
 }
 
 func (xy XY) DistanceTo(other XY) float64 {