From: Evert Timberg <evert.timberg@gmail.com>
Date: Tue, 9 Jun 2015 22:24:43 +0000 (-0400)
Subject: Use a polyfill when Math.log10 does not exist
X-Git-Tag: 2.0.0-alpha2~28^2
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=refs%2Fpull%2F1186%2Fhead;p=thirdparty%2FChart.js.git

Use a polyfill when Math.log10 does not exist
---

diff --git a/src/Chart.Core.js b/src/Chart.Core.js
index 8034efabf..8fd4dfc0a 100755
--- a/src/Chart.Core.js
+++ b/src/Chart.Core.js
@@ -329,6 +329,13 @@
                 return x > 0 ? 1 : -1;
             }
         },
+        log10 = helpers.log10 = function(x) {
+            if (Math.log10) {
+                return Math.log10(x)
+            } else {
+                return Math.log(x) / Math.LN10;
+            }
+        },
         cap = helpers.cap = function(valueToCap, maxValue, minValue) {
             if (isNumber(maxValue)) {
                 if (valueToCap > maxValue) {
@@ -484,7 +491,7 @@
         },
         // Implementation of the nice number algorithm used in determining where axis labels will go
         niceNum = helpers.niceNum = function(range, round) {
-            var exponent = Math.floor(Math.log10(range));
+            var exponent = Math.floor(helpers.log10(range));
             var fraction = range / Math.pow(10, exponent);
             var niceFraction;