Add chart.axisY2 API

c3.js

@@ -7971,6 +7971,14 @@
         
         $$.redraw();
     };
+    c3_chart_fn.axisY2 = function(value){
+        var $$ = this.internal;
+
+        $$.config.axis_y2_show = !!value;
+        $$.axes.y2.style("visibility", $$.config.axis_y2_show ? 'visible' : 'hidden');
+        
+        $$.redraw();
+    };
 
     c3_chart_fn.legend = function () {};
     c3_chart_fn.legend.show = function (targetIds) {
@@ -8070,7 +8078,7 @@
         }              
     };  
 
-    c3.chart.fn.turn = function(options){
+    c3_chart_fn.turn = function(options){
         var $$ = this.internal;         
         var turnAngle;
 
@@ -8401,6 +8409,8 @@
                     
                 tspan.text(function (d) {
                     if (d.splitted.length) {
+                        // FIXME this should know when
+                        // ticks are rotated
                         $$.config.maxTickTextWidth = Math.max(
                             $$.config.maxTickTextWidth || 0,
                             d.splitted.length * fontSize / $$.config.text_h_to_w

src/api.axis.js

@@ -99,3 +99,11 @@ c3_chart_fn.axisY = function (value){
     
     $$.redraw();
 };
+c3_chart_fn.axisY2 = function(value){
+    var $$ = this.internal;
+
+    $$.config.axis_y2_show = !!value;
+    $$.axes.y2.style("visibility", $$.config.axis_y2_show ? 'visible' : 'hidden');
+    
+    $$.redraw();
+};

src/api.chart.js

@@ -61,7 +61,7 @@ c3_chart_fn.bgcolor = function(value) {
     }              
 };  
 
-c3.chart.fn.turn = function(options){
+c3_chart_fn.turn = function(options){
     var $$ = this.internal;         
     var turnAngle;
 

src/c3.axis.js

@@ -271,6 +271,8 @@ function c3_axis(d3, params, $$) {
                 
             tspan.text(function (d) {
                 if (d.splitted.length) {
+                    // FIXME this should know when
+                    // ticks are rotated
                     $$.config.maxTickTextWidth = Math.max(
                         $$.config.maxTickTextWidth || 0,
                         d.splitted.length * fontSize / $$.config.text_h_to_w