Merge pull request #473 from chriskalmar/dynamic-tickvalues

Dynamic tickValues

c3.js

@@ -5558,8 +5558,15 @@
             return axis;
         };
         axis.tickValues = function (x) {
+            if (typeof x === 'function') {
+                tickValues = function () {
+                    return x(scale.domain());
+                };
+            }
+            else {
                 if (!arguments.length) { return tickValues; }
                 tickValues = x;
+            }
             return axis;
         };
         return axis;