78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
package gobot
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import (
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"crypto/rand"
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"errors"
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"log"
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"math"
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"math/big"
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"time"
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)
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var (
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// ErrUnknownEvent is the error resulting if the specified Event does not exist
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ErrUnknownEvent = errors.New("Event does not exist")
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)
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var eventError = func(e *Event) (err error) {
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if e == nil {
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err = ErrUnknownEvent
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log.Println(err.Error())
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return
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}
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return
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}
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// Every triggers f every t time until the end of days, or when a
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// bool value is sent to the channel returned by the Every function.
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// It does not wait for the previous execution of f to finish before
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// it fires the next f.
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func Every(t time.Duration, f func()) chan bool {
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done := make(chan bool)
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c := time.Tick(t)
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go func() {
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for {
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select {
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case <-done:
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return
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default:
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<-c
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go f()
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}
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}
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}()
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return done
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}
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// After triggers f after t duration.
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func After(t time.Duration, f func()) {
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time.AfterFunc(t, f)
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}
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// Rand returns a positive random int up to max
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func Rand(max int) int {
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i, _ := rand.Int(rand.Reader, big.NewInt(int64(max)))
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return int(i.Int64())
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}
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// FromScale returns a converted input from min, max to 0.0...1.0.
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func FromScale(input, min, max float64) float64 {
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return (input - math.Min(min, max)) / (math.Max(min, max) - math.Min(min, max))
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}
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// ToScale returns a converted input from 0...1 to min...max scale.
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// If input is less than min then ToScale returns min.
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// If input is greater than max then ToScale returns max
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func ToScale(input, min, max float64) float64 {
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i := input*(math.Max(min, max)-math.Min(min, max)) + math.Min(min, max)
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if i < math.Min(min, max) {
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return math.Min(min, max)
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} else if i > math.Max(min, max) {
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return math.Max(min, max)
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} else {
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return i
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}
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}
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