go-chart/seq/util.go

package seq

import "math"

func round(input float64, places int) (rounded float64) {
	if math.IsNaN(input) {
		return 0.0
	}

	sign := 1.0
	if input < 0 {
		sign = -1
		input *= -1
	}

	precision := math.Pow(10, float64(places))
	digit := input * precision
	_, decimal := math.Modf(digit)

	if decimal >= 0.5 {
		rounded = math.Ceil(digit)
	} else {
		rounded = math.Floor(digit)
	}

	return rounded / precision * sign
}

func f64i(value float64) int {
	r := round(value, 0)
	return int(r)
}