get last 30 days

goCharts/draw.go

@@ -25,10 +25,10 @@ func getRand(len int) []float64 {
 
 func Draw() {
 	values := [][]float64{
-		getRand(7),
-		getRand(7),
-		getRand(7),
-		getRand(7),
+		getRand(30),
+		getRand(30),
+		getRand(30),
+		getRand(30),
 	}
 	p, err := charts.LineRender(
 		values,
@@ -37,7 +37,7 @@ func Draw() {
 		charts.WidthOptionFunc(720),
 		charts.HeightOptionFunc(1280),
 		charts.TitleTextOptionFunc("symbol price"),
-		charts.XAxisDataOptionFunc(getLastDays()),
+		charts.XAxisDataOptionFunc(getLastDays(30)),
 		charts.LegendLabelsOptionFunc([]string{
 			"BTC",
 			"ETH",
@@ -68,18 +68,14 @@ func Draw() {
 	}
 }
 
-func getLastDays() []string {
+func getLastDays(len int) []string {
 	now := time.Now()
 	getDay := func(t time.Time, dif int) string {
 		return t.AddDate(0, 0, dif).Format("01/02")
 	}
-	return []string{
-		getDay(now, -6),
-		getDay(now, -5),
-		getDay(now, -4),
-		getDay(now, -3),
-		getDay(now, -2),
-		getDay(now, -1),
-		getDay(now, 0),
+	var res []string
+	for i := 1; i <= len; i++ {
+		res = append(res, getDay(now, i-len))
 	}
+	return res
 }