go-chart/value_formatter.go

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package chart
import (
"fmt"
"time"
)
// ValueFormatter is a function that takes a value and produces a string.
type ValueFormatter func(v interface{}) string
// TimeValueFormatter is a ValueFormatter for timestamps.
func TimeValueFormatter(v interface{}) string {
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return formatTime(v, DefaultDateFormat)
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}
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// TimeHourValueFormatter is a ValueFormatter for timestamps.
func TimeHourValueFormatter(v interface{}) string {
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return formatTime(v, DefaultDateHourFormat)
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}
// TimeMinuteValueFormatter is a ValueFormatter for timestamps.
func TimeMinuteValueFormatter(v interface{}) string {
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return formatTime(v, DefaultDateMinuteFormat)
}
// TimeDateValueFormatter is a ValueFormatter for timestamps.
func TimeDateValueFormatter(v interface{}) string {
return formatTime(v, "2006-01-02")
}
// TimeValueFormatterWithFormat returns a time formatter with a given format.
func TimeValueFormatterWithFormat(format string) ValueFormatter {
return func(v interface{}) string {
return formatTime(v, format)
}
}
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// TimeValueFormatterWithFormat is a ValueFormatter for timestamps with a given format.
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func formatTime(v interface{}, dateFormat string) string {
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if typed, isTyped := v.(time.Time); isTyped {
return typed.Format(dateFormat)
}
if typed, isTyped := v.(int64); isTyped {
return time.Unix(0, typed).Format(dateFormat)
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}
if typed, isTyped := v.(float64); isTyped {
return time.Unix(0, int64(typed)).Format(dateFormat)
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}
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return ""
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}
// FloatValueFormatter is a ValueFormatter for float64.
func FloatValueFormatter(v interface{}) string {
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return FloatValueFormatterWithFormat(v, DefaultFloatFormat)
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}
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// PercentValueFormatter is a formatter for percent values.
// NOTE: it normalizes the values, i.e. multiplies by 100.0.
func PercentValueFormatter(v interface{}) string {
if typed, isTyped := v.(float64); isTyped {
return FloatValueFormatterWithFormat(typed*100.0, DefaultPercentValueFormat)
}
return ""
}
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// FloatValueFormatterWithFormat is a ValueFormatter for float64 with a given format.
func FloatValueFormatterWithFormat(v interface{}, floatFormat string) string {
if typed, isTyped := v.(float64); isTyped {
return fmt.Sprintf(floatFormat, typed)
}
if typed, isTyped := v.(float32); isTyped {
return fmt.Sprintf(floatFormat, typed)
}
if typed, isTyped := v.(int); isTyped {
return fmt.Sprintf(floatFormat, float64(typed))
}
if typed, isTyped := v.(int64); isTyped {
return fmt.Sprintf(floatFormat, float64(typed))
}
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return ""
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}