From df6180e59aea0a7d3d45be72a9b49bb4a09df0c9 Mon Sep 17 00:00:00 2001
From: vicanso <tree.xie@outlook.com>
Date: Mon, 28 Nov 2022 19:55:14 +0800
Subject: [PATCH] fix: fix zero max value of nan, #37

---
 range.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/range.go b/range.go
index 51d3332..ec64c2d 100644
--- a/range.go
+++ b/range.go
@@ -121,6 +121,9 @@ func (r axisRange) Values() []string {
 }
 
 func (r *axisRange) getHeight(value float64) int {
+	if r.max <= r.min {
+		return 0
+	}
 	v := (value - r.min) / (r.max - r.min)
 	return int(v * float64(r.size))
 }