package metrics
import (
"fmt"
"io"
"text/tabwriter"
)
const (
bs = "####################################################################################################"
bsz = float64(len(bs))
)
// PrintDistribution writes a human-readable graph of the distribution to the
// passed writer.
func PrintDistribution(w io.Writer, h Histogram) {
buckets, quantiles := h.Distribution()
fmt.Fprintf(w, "name: %v\n", h.Name())
fmt.Fprintf(w, "quantiles: %v\n", quantiles)
var total float64
for _, bucket := range buckets {
total += float64(bucket.Count)
}
tw := tabwriter.NewWriter(w, 0, 2, 2, ' ', 0)
fmt.Fprintf(tw, "From\tTo\tCount\tProb\tBar\n")
axis := "|"
for _, bucket := range buckets {
if bucket.Count > 0 {
p := float64(bucket.Count) / total
fmt.Fprintf(tw, "%d\t%d\t%d\t%.4f\t%s%s\n", bucket.From, bucket.To, bucket.Count, p, axis, bs[:int(p*bsz)])
axis = "|"
} else {
axis = ":" // show that some bars were skipped
}
}
tw.Flush()
}