From 5e5ff104d2d5e868a704cce3c51bd614325199f2 Mon Sep 17 00:00:00 2001
From: Will Charczuk <will@clotheshor.se>
Date: Fri, 8 Jul 2016 00:04:39 -0700
Subject: [PATCH] let users specify formatters.

---
 chart.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/chart.go b/chart.go
index 2f380f1..61b75af 100644
--- a/chart.go
+++ b/chart.go
@@ -163,8 +163,12 @@ func (c Chart) initRanges(canvasBox Box) (xrange Range, yrange Range) {
 				didSetFirstValues = true
 			}
 		}
-		xrange.Formatter = s.GetXFormatter()
-		yrange.Formatter = s.GetYFormatter()
+		if xrange.Formatter == nil {
+			xrange.Formatter = s.GetXFormatter()
+		}
+		if yrange.Format == nil {
+			yrange.Formatter = s.GetYFormatter()
+		}
 	}
 
 	if c.XRange.IsZero() {