Add response time badge and chart

vendor/github.com/wcharczuk/go-chart/v2/min_max_series.go

@@ -0,0 +1,138 @@
+package chart
+
+import (
+	"fmt"
+	"math"
+)
+
+// MinSeries draws a horizontal line at the minimum value of the inner series.
+type MinSeries struct {
+	Name        string
+	Style       Style
+	YAxis       YAxisType
+	InnerSeries ValuesProvider
+
+	minValue *float64
+}
+
+// GetName returns the name of the time series.
+func (ms MinSeries) GetName() string {
+	return ms.Name
+}
+
+// GetStyle returns the line style.
+func (ms MinSeries) GetStyle() Style {
+	return ms.Style
+}
+
+// GetYAxis returns which YAxis the series draws on.
+func (ms MinSeries) GetYAxis() YAxisType {
+	return ms.YAxis
+}
+
+// Len returns the number of elements in the series.
+func (ms MinSeries) Len() int {
+	return ms.InnerSeries.Len()
+}
+
+// GetValues gets a value at a given index.
+func (ms *MinSeries) GetValues(index int) (x, y float64) {
+	ms.ensureMinValue()
+	x, _ = ms.InnerSeries.GetValues(index)
+	y = *ms.minValue
+	return
+}
+
+// Render renders the series.
+func (ms *MinSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
+	style := ms.Style.InheritFrom(defaults)
+	Draw.LineSeries(r, canvasBox, xrange, yrange, style, ms)
+}
+
+func (ms *MinSeries) ensureMinValue() {
+	if ms.minValue == nil {
+		minValue := math.MaxFloat64
+		var y float64
+		for x := 0; x < ms.InnerSeries.Len(); x++ {
+			_, y = ms.InnerSeries.GetValues(x)
+			if y < minValue {
+				minValue = y
+			}
+		}
+		ms.minValue = &minValue
+	}
+}
+
+// Validate validates the series.
+func (ms *MinSeries) Validate() error {
+	if ms.InnerSeries == nil {
+		return fmt.Errorf("min series requires InnerSeries to be set")
+	}
+	return nil
+}
+
+// MaxSeries draws a horizontal line at the maximum value of the inner series.
+type MaxSeries struct {
+	Name        string
+	Style       Style
+	YAxis       YAxisType
+	InnerSeries ValuesProvider
+
+	maxValue *float64
+}
+
+// GetName returns the name of the time series.
+func (ms MaxSeries) GetName() string {
+	return ms.Name
+}
+
+// GetStyle returns the line style.
+func (ms MaxSeries) GetStyle() Style {
+	return ms.Style
+}
+
+// GetYAxis returns which YAxis the series draws on.
+func (ms MaxSeries) GetYAxis() YAxisType {
+	return ms.YAxis
+}
+
+// Len returns the number of elements in the series.
+func (ms MaxSeries) Len() int {
+	return ms.InnerSeries.Len()
+}
+
+// GetValues gets a value at a given index.
+func (ms *MaxSeries) GetValues(index int) (x, y float64) {
+	ms.ensureMaxValue()
+	x, _ = ms.InnerSeries.GetValues(index)
+	y = *ms.maxValue
+	return
+}
+
+// Render renders the series.
+func (ms *MaxSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
+	style := ms.Style.InheritFrom(defaults)
+	Draw.LineSeries(r, canvasBox, xrange, yrange, style, ms)
+}
+
+func (ms *MaxSeries) ensureMaxValue() {
+	if ms.maxValue == nil {
+		maxValue := -math.MaxFloat64
+		var y float64
+		for x := 0; x < ms.InnerSeries.Len(); x++ {
+			_, y = ms.InnerSeries.GetValues(x)
+			if y > maxValue {
+				maxValue = y
+			}
+		}
+		ms.maxValue = &maxValue
+	}
+}
+
+// Validate validates the series.
+func (ms *MaxSeries) Validate() error {
+	if ms.InnerSeries == nil {
+		return fmt.Errorf("max series requires InnerSeries to be set")
+	}
+	return nil
+}