Make y axis width size configurable

src/config.js

@@ -111,6 +111,7 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         axis_x_height: undefined,
         axis_x_extent: undefined,
         axis_x_label: {},
+        axis_y_width: undefined,
         axis_y_show: true,
         axis_y_type: undefined,
         axis_y_max: undefined,
@@ -121,7 +122,7 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         axis_y_label: {},
         axis_y_tick_format: undefined,
         axis_y_tick_outer: true,
-        axis_y_tick_values: null,        
+        axis_y_tick_values: null,
         axis_y_tick_rotate: 0,
         axis_y_tick_count: undefined,
         axis_y_tick_time_value: undefined,

src/size.js

@@ -88,8 +88,12 @@ c3_chart_internal_fn.getSvgLeft = function (withoutRecompute) {
 
 
 c3_chart_internal_fn.getAxisWidthByAxisId = function (id, withoutRecompute) {
-    var $$ = this, position = $$.axis.getLabelPositionById(id);
-    return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
+    var $$ = this, position = $$.axis.getLabelPositionById(id), config = $$.config;
+    if(config.axis_y_width !== undefined) {
+        return config.axis_y_width + (position.isInner ? 20 : 40);
+    } else {
+        return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
+    }
 };
 c3_chart_internal_fn.getHorizontalAxisHeight = function (axisId) {
     var $$ = this, config = $$.config, h = 30;