33 lines
689 B
Go
33 lines
689 B
Go
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package util
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import (
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"math"
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)
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var sparkChars = []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
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func Sparkline(series []int64) string {
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out := make([]rune, len(series))
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min := Minimum(series)
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max := Maximum(series)
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dataRange := max - min
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if dataRange == 0 {
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for i := range series {
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out[i] = sparkChars[0]
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}
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} else {
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step := float64(len(sparkChars)-1) / float64(dataRange)
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for i, n := range series {
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idx := int(math.Round(float64(Clamp(min, max, n)-min) * step))
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if idx < 0 {
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out[i] = ' '
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} else if idx > len(sparkChars) {
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out[i] = sparkChars[len(sparkChars)-1]
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} else {
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out[i] = sparkChars[idx]
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}
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}
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}
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return string(out)
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}
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