156 lines
3.6 KiB
Go
156 lines
3.6 KiB
Go
package chart
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import "time"
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// SecondsPerXYZ
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const (
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SecondsPerHour = 60 * 60
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SecondsPerDay = 60 * 60 * 24
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)
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// TimeMillis returns a duration as a float millis.
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func TimeMillis(d time.Duration) float64 {
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return float64(d) / float64(time.Millisecond)
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}
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// DiffHours returns the difference in hours between two times.
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func DiffHours(t1, t2 time.Time) (hours int) {
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t1n := t1.Unix()
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t2n := t2.Unix()
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var diff int64
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if t1n > t2n {
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diff = t1n - t2n
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} else {
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diff = t2n - t1n
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}
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return int(diff / (SecondsPerHour))
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}
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// TimeMin returns the minimum and maximum times in a given range.
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func TimeMin(times ...time.Time) (min time.Time) {
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if len(times) == 0 {
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return
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}
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min = times[0]
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for index := 1; index < len(times); index++ {
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if times[index].Before(min) {
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min = times[index]
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}
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}
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return
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}
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// TimeMax returns the minimum and maximum times in a given range.
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func TimeMax(times ...time.Time) (max time.Time) {
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if len(times) == 0 {
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return
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}
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max = times[0]
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for index := 1; index < len(times); index++ {
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if times[index].After(max) {
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max = times[index]
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}
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}
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return
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}
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// TimeMinMax returns the minimum and maximum times in a given range.
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func TimeMinMax(times ...time.Time) (min, max time.Time) {
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if len(times) == 0 {
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return
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}
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min = times[0]
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max = times[0]
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for index := 1; index < len(times); index++ {
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if times[index].Before(min) {
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min = times[index]
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}
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if times[index].After(max) {
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max = times[index]
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}
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}
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return
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}
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// TimeToFloat64 returns a float64 representation of a time.
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func TimeToFloat64(t time.Time) float64 {
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if t.IsZero() {
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return 0
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}
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return float64(t.UnixNano())
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}
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// TimeFromFloat64 returns a time in nanosecond from a float64.
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func TimeFromFloat64(tf float64) time.Time {
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if tf == 0 {
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return time.Time{}
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}
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return time.Unix(0, int64(tf))
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}
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// TimeDescending sorts a given list of times ascending, or min to max.
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type TimeDescending []time.Time
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// Len implements sort.Sorter
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func (d TimeDescending) Len() int { return len(d) }
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// Swap implements sort.Sorter
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func (d TimeDescending) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
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// Less implements sort.Sorter
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func (d TimeDescending) Less(i, j int) bool { return d[i].After(d[j]) }
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// TimeAscending sorts a given list of times ascending, or min to max.
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type TimeAscending []time.Time
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// Len implements sort.Sorter
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func (a TimeAscending) Len() int { return len(a) }
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// Swap implements sort.Sorter
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func (a TimeAscending) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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// Less implements sort.Sorter
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func (a TimeAscending) Less(i, j int) bool { return a[i].Before(a[j]) }
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// Days generates a seq of timestamps by day, from -days to today.
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func Days(days int) []time.Time {
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var values []time.Time
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for day := days; day >= 0; day-- {
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values = append(values, time.Now().AddDate(0, 0, -day))
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}
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return values
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}
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// Hours returns a sequence of times by the hour for a given number of hours
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// after a given start.
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func Hours(start time.Time, totalHours int) []time.Time {
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times := make([]time.Time, totalHours)
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last := start
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for i := 0; i < totalHours; i++ {
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times[i] = last
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last = last.Add(time.Hour)
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}
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return times
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}
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// HoursFilled adds zero values for the data bounded by the start and end of the xdata array.
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func HoursFilled(xdata []time.Time, ydata []float64) ([]time.Time, []float64) {
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start, end := TimeMinMax(xdata...)
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totalHours := DiffHours(start, end)
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finalTimes := Hours(start, totalHours+1)
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finalValues := make([]float64, totalHours+1)
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var hoursFromStart int
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for i, xd := range xdata {
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hoursFromStart = DiffHours(start, xd)
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finalValues[hoursFromStart] = ydata[i]
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}
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return finalTimes, finalValues
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}
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