test: add test for legend, series and theme

theme.go

@@ -23,6 +23,8 @@
 package charts
 
 import (
+	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/wcharczuk/go-chart/v2"
@@ -44,6 +46,20 @@ var AxisColorDark = drawing.Color{
 	A: 255,
 }
 
+var GridColorDark = drawing.Color{
+	R: 72,
+	G: 71,
+	B: 83,
+	A: 255,
+}
+
+var GridColorLight = drawing.Color{
+	R: 224,
+	G: 230,
+	B: 241,
+	A: 255,
+}
+
 var BackgroundColorDark = drawing.Color{
 	R: 16,
 	G: 12,
@@ -67,19 +83,9 @@ func getAxisColor(theme string) drawing.Color {
 
 func getGridColor(theme string) drawing.Color {
 	if theme == ThemeDark {
-		return drawing.Color{
-			R: 72,
-			G: 71,
-			B: 83,
-			A: 255,
-		}
-	}
-	return drawing.Color{
-		R: 224,
-		G: 230,
-		B: 241,
-		A: 255,
+		return GridColorDark
 	}
+	return GridColorLight
 }
 
 var SeriesColorsLight = []drawing.Color{
@@ -180,12 +186,37 @@ func getSeriesColor(theme string, index int) drawing.Color {
 }
 
 func parseColor(color string) drawing.Color {
+	c := drawing.Color{}
 	if color == "" {
-		return drawing.Color{}
+		return c
 	}
 	if strings.HasPrefix(color, "#") {
 		return drawing.ColorFromHex(color[1:])
 	}
-	// TODO rgba
-	return drawing.Color{}
+	reg := regexp.MustCompile(`\((\S+)\)`)
+	result := reg.FindAllStringSubmatch(color, 1)
+	if len(result) == 0 || len(result[0]) != 2 {
+		return c
+	}
+	arr := strings.Split(result[0][1], ",")
+	if len(arr) < 3 {
+		return c
+	}
+	// 设置默认为255
+	c.A = 255
+	for index, v := range arr {
+		value, _ := strconv.Atoi(strings.TrimSpace(v))
+		ui8 := uint8(value)
+		switch index {
+		case 0:
+			c.R = ui8
+		case 1:
+			c.G = ui8
+		case 2:
+			c.B = ui8
+		default:
+			c.A = ui8
+		}
+	}
+	return c
 }