55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
package chart
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import (
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"fmt"
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"time"
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)
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// ValueFormatter is a function that takes a value and produces a string.
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type ValueFormatter func(v interface{}) string
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// TimeValueFormatter is a ValueFormatter for timestamps.
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func TimeValueFormatter(v interface{}) string {
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return TimeValueFormatterWithFormat(v, DefaultDateFormat)
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}
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// TimeHourValueFormatter is a ValueFormatter for timestamps.
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func TimeHourValueFormatter(v interface{}) string {
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return TimeValueFormatterWithFormat(v, DefaultDateHourFormat)
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}
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// TimeValueFormatterWithFormat is a ValueFormatter for timestamps with a given format.
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func TimeValueFormatterWithFormat(v interface{}, dateFormat string) string {
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if typed, isTyped := v.(time.Time); isTyped {
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return typed.Format(dateFormat)
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}
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if typed, isTyped := v.(int64); isTyped {
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return time.Unix(typed, 0).Format(dateFormat)
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}
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if typed, isTyped := v.(float64); isTyped {
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return time.Unix(int64(typed), 0).Format(dateFormat)
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}
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return ""
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}
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// FloatValueFormatter is a ValueFormatter for float64.
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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.
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// NOTE: it normalizes the values, i.e. multiplies by 100.0.
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func PercentValueFormatter(v interface{}) string {
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if typed, isTyped := v.(float64); isTyped {
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return FloatValueFormatterWithFormat(typed*100.0, DefaultPercentValueFormat)
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}
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return ""
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}
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// FloatValueFormatterWithFormat is a ValueFormatter for float64 with a given format.
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func FloatValueFormatterWithFormat(v interface{}, floatFormat string) string {
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if typed, isTyped := v.(float64); isTyped {
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return fmt.Sprintf(floatFormat, typed)
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}
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return ""
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}
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