add mathx.RoundToInteger helper

x/mathx/round.go

@@ -26,3 +26,18 @@ func RoundDown(input float64, places float64) float64 {
 	pow := math.Pow(10, places)
 	return math.Floor(pow*input) / pow
 }
+
+// RoundToInteger rounds the given float64 to an integer.
+func RoundToInteger(x float64) int {
+	// If the number is 1.1 round it to the previous integer (1), if >= 1.11 round it to the next one (2).
+	t := math.Trunc(x)
+	odd := math.Remainder(t, 2) != 0
+	d := math.Abs(x - t)
+	d = Round(d, 0.5, 2) // round to 2 decimals so we can easily check 0.11 and 0.1 and 0.2.
+	if d > 0.1 || (d == 0.2 && odd) {
+		// fmt.Printf("%f-%f -> %f. Is > 0.1 -> %v \n", x, t, d, d > 0.1)
+		t = t + math.Copysign(1, x)
+		return int(t)
+	}
+	return int(t)
+}