92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
package chart
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import (
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"math"
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"math/rand"
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"time"
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)
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var (
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_ Sequence[float64] = (*RandomSeq)(nil)
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)
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// RandomValues returns an array of random values.
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func RandomValues(count int) []float64 {
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return Seq[float64]{NewRandomSequence().WithLen(count)}.Values()
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}
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// RandomValuesWithMax returns an array of random values with a given average.
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func RandomValuesWithMax(count int, max float64) []float64 {
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return Seq[float64]{NewRandomSequence().WithMax(max).WithLen(count)}.Values()
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}
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// NewRandomSequence creates a new random seq.
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func NewRandomSequence() *RandomSeq {
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return &RandomSeq{
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rnd: rand.New(rand.NewSource(time.Now().Unix())),
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}
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}
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// RandomSeq is a random number seq generator.
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type RandomSeq struct {
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rnd *rand.Rand
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max *float64
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min *float64
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len *int
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}
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// Len returns the number of elements that will be generated.
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func (r *RandomSeq) Len() int {
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if r.len != nil {
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return *r.len
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}
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return math.MaxInt32
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}
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// GetValue returns the value.
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func (r *RandomSeq) GetValue(_ int) float64 {
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if r.min != nil && r.max != nil {
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var delta float64
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if *r.max > *r.min {
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delta = *r.max - *r.min
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} else {
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delta = *r.min - *r.max
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}
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return *r.min + (r.rnd.Float64() * delta)
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} else if r.max != nil {
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return r.rnd.Float64() * *r.max
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} else if r.min != nil {
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return *r.min + (r.rnd.Float64())
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}
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return r.rnd.Float64()
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}
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// WithLen sets a maximum len
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func (r *RandomSeq) WithLen(length int) *RandomSeq {
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r.len = &length
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return r
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}
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// Min returns the minimum value.
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func (r RandomSeq) Min() *float64 {
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return r.min
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}
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// WithMin sets the scale and returns the Random.
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func (r *RandomSeq) WithMin(min float64) *RandomSeq {
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r.min = &min
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return r
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}
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// Max returns the maximum value.
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func (r RandomSeq) Max() *float64 {
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return r.max
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}
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// WithMax sets the average and returns the Random.
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func (r *RandomSeq) WithMax(max float64) *RandomSeq {
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r.max = &max
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return r
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}
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