Fix tick for category axis

c3.js

@@ -2367,6 +2367,7 @@
 
     c3_chart_internal_fn.categoryName = function (i) {
         var config = this.config;
+
         return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
     };
 
@@ -8207,7 +8208,20 @@
                 // this should be called only when category axis
                 function splitTickText(d, maxWidth) {
                     var tickText = textFormatted(d),
-                        subtext, spaceIndex, textWidth, splitted = [];
+                        subtext, spaceIndex, textWidth, thinOutCoef, splitted = [];
+
+                    switch(orient){
+                        case "top":
+                        case "bottom":
+                            thinOutCoef = $$.getYThinOutCoef();
+                        case "left":
+                        case "right":
+                            thinOutCoef = $$.getXThinOutCoef();
+                    }
+
+                    if(d % thinOutCoef !== 0){
+                        return [""];
+                    }
 
                     if (Object.prototype.toString.call(tickText) === "[object Array]") {
                         return tickText;

src/c3.axis.js

@@ -141,7 +141,20 @@ function c3_axis(d3, params, $$) {
             // this should be called only when category axis
             function splitTickText(d, maxWidth) {
                 var tickText = textFormatted(d),
-                    subtext, spaceIndex, textWidth, splitted = [];
+                    subtext, spaceIndex, textWidth, thinOutCoef, splitted = [];
+
+                switch(orient){
+                    case "top":
+                    case "bottom":
+                        thinOutCoef = $$.getYThinOutCoef();
+                    case "left":
+                    case "right":
+                        thinOutCoef = $$.getXThinOutCoef();
+                }
+
+                if(d % thinOutCoef !== 0){
+                    return [""];
+                }
 
                 if (Object.prototype.toString.call(tickText) === "[object Array]") {
                     return tickText;

src/category.js

 c3_chart_internal_fn.categoryName = function (i) {
     var config = this.config;
+
     return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
 };