From 4223a84a6dd654ff906db283c06f5827beeb7786 Mon Sep 17 00:00:00 2001
From: Jamie Alquiza <jamiealquiza@gmail.com>
Date: Wed, 2 May 2018 11:28:21 -0600
Subject: [PATCH] scale func updated to handle all equal input values

---
 tachymeter.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tachymeter.go b/tachymeter.go
index 4a6bcc6..c4c0977 100644
--- a/tachymeter.go
+++ b/tachymeter.go
@@ -294,5 +294,12 @@ func (h *Histogram) String(s int) string {
 // Scale scales the input x with the input-min a0,
 // input-max a1, output-min b0, and output-max b1.
 func scale(x, a0, a1, b0, b1 float64) float64 {
-	return (x-a0)/(a1-a0)*(b1-b0) + b0
+	a, b := x-a0, a1-a0
+	var c float64
+	if a == 0 {
+		c = 0
+	} else {
+		c = a / b
+	}
+	return c*(b1-b0) + b0
 }