56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
package chart
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import (
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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 contains some sequence utilities.
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// These utilities can be useful for generating test data.
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Sequence = &sequence{}
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)
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type sequence struct{}
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// Float64 produces an array of floats from [start,end] by optional steps.
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func (s sequence) Float64(start, end float64, steps ...float64) []float64 {
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var values []float64
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step := 1.0
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if len(steps) > 0 {
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step = steps[0]
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}
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if start < end {
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for x := start; x <= end; x += step {
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values = append(values, x)
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}
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} else {
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for x := start; x >= end; x = x - step {
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values = append(values, x)
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}
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}
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return values
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}
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// Random generates a fixed length sequence of random values between (0, scale).
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func (s sequence) Random(samples int, scale float64) []float64 {
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rnd := rand.New(rand.NewSource(time.Now().Unix()))
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values := make([]float64, samples)
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for x := 0; x < samples; x++ {
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values[x] = rnd.Float64() * scale
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}
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return values
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}
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// Days generates a sequence of timestamps by day, from -days to today.
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func (s sequence) 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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