go-chart/util.go

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package chart
import (
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"fmt"
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"time"
)
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// TimeToFloat64 returns a float64 representation of a time.
func TimeToFloat64(t time.Time) float64 {
return float64(t.Unix())
}
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// MinAndMax returns both the min and max in one pass.
func MinAndMax(values ...float64) (min float64, max float64) {
if len(values) == 0 {
return
}
min = values[0]
max = values[0]
for _, v := range values {
if max < v {
max = v
}
if min > v {
min = v
}
}
return
}
// MinAndMaxOfTime returns the min and max of a given set of times
// in one pass.
func MinAndMaxOfTime(values ...time.Time) (min time.Time, max time.Time) {
if len(values) == 0 {
return
}
min = values[0]
max = values[0]
for _, v := range values {
if max.Before(v) {
max = v
}
if min.After(v) {
min = v
}
}
return
}
// Slices generates N slices that span the total.
// The resulting array will be intermediate indexes until total.
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func Slices(count int, total float64) []float64 {
var values []float64
sliceWidth := float64(total) / float64(count)
for cursor := 0.0; cursor < total; cursor += sliceWidth {
values = append(values, cursor)
}
return values
}
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// Float is an alias for float64 that provides a better .String() method.
type Float float64
// String returns the string representation of a float.
func (f Float) String() string {
return fmt.Sprintf("%.2f", f)
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}