additions

_examples/stock_analysis/main.go

@@ -14,7 +14,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	priceSeries := chart.TimeSeries{
 		Name: "SPY",
 		Style: chart.Style{
-			Show:        true,
 			StrokeColor: chart.GetDefaultColor(0),
 		},
 		XValues: xv,
@@ -24,7 +23,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	smaSeries := chart.SMASeries{
 		Name: "SPY - SMA",
 		Style: chart.Style{
-			Show:            true,
 			StrokeColor:     drawing.ColorRed,
 			StrokeDashArray: []float64{5.0, 5.0},
 		},
@@ -34,7 +32,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	bbSeries := &chart.BollingerBandsSeries{
 		Name: "SPY - Bol. Bands",
 		Style: chart.Style{
-			Show:        true,
 			StrokeColor: drawing.ColorFromHex("efefef"),
 			FillColor:   drawing.ColorFromHex("efefef").WithAlpha(64),
 		},
@@ -43,11 +40,9 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style:        chart.StyleShow(),
 			TickPosition: chart.TickPositionBetweenTicks,
 		},
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Max: 220.0,
 				Min: 180.0,

bounded_last_values_annotation_series.go

@@ -0,0 +1,36 @@
+package chart
+
+import "fmt"
+
+// BoundedLastValuesAnnotationSeries returns a last value annotation series for a bounded values provider.
+func BoundedLastValuesAnnotationSeries(innerSeries FullBoundedValuesProvider, vfs ...ValueFormatter) AnnotationSeries {
+	lvx, lvy1, lvy2 := innerSeries.GetBoundedLastValues()
+
+	var vf ValueFormatter
+	if len(vfs) > 0 {
+		vf = vfs[0]
+	} else if typed, isTyped := innerSeries.(ValueFormatterProvider); isTyped {
+		_, vf = typed.GetValueFormatters()
+	} else {
+		vf = FloatValueFormatter
+	}
+
+	label1 := vf(lvy1)
+	label2 := vf(lvy2)
+
+	var seriesName string
+	var seriesStyle Style
+	if typed, isTyped := innerSeries.(Series); isTyped {
+		seriesName = fmt.Sprintf("%s - Last Values", typed.GetName())
+		seriesStyle = typed.GetStyle()
+	}
+
+	return AnnotationSeries{
+		Name:  seriesName,
+		Style: seriesStyle,
+		Annotations: []Value2{
+			{XValue: lvx, YValue: lvy1, Label: label1},
+			{XValue: lvx, YValue: lvy2, Label: label2},
+		},
+	}
+}

value_formatter.go

@@ -96,3 +96,10 @@ func FloatValueFormatterWithFormat(v interface{}, floatFormat string) string {
 	}
 	return ""
 }
+
+// KValueFormatter is a formatter for K values.
+func KValueFormatter(k float64, vf ValueFormatter) ValueFormatter {
+	return func(v interface{}) string {
+		return fmt.Sprintf("%0.0fσ %s", k, vf(v))
+	}
+}