Fix centered category axis - #804

c3.js

@@ -6650,7 +6650,7 @@
                     var dy = sizeFor1Char.h;
                     if (i === 0) {
                         if (orient === 'left' || orient === 'right') {
-                            dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - (params.isCategory ? 2 : 3));
+                            dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - 3);
                         } else {
                             dy = ".71em";
                         }
@@ -6659,7 +6659,7 @@
                 }
 
                 function tickSize(d) {
-                    var tickPosition = scale(d) + tickOffset;
+                    var tickPosition = scale(d) + (tickCentered ? 0 : tickOffset);
                     return range[0] < tickPosition && tickPosition < range[1] ? innerTickSize : 0;
                 }
 

spec/axis-spec.js

@@ -411,7 +411,7 @@ describe('c3 chart axis', function () {
                     ticks.each(function (d, i) {
                         var tspans = d3.select(this).selectAll('tspan'),
                             expectedX = '-9',
-                            expectedDy = '2';
+                            expectedDy = '3';
                         if (i > 0) { // i === 0 should be checked in next test
                             expect(tspans.size()).toBe(1);
                             tspans.each(function () {

src/c3.axis.js

@@ -146,7 +146,7 @@ function c3_axis(d3, params) {
                 var dy = sizeFor1Char.h;
                 if (i === 0) {
                     if (orient === 'left' || orient === 'right') {
-                        dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - (params.isCategory ? 2 : 3));
+                        dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - 3);
                     } else {
                         dy = ".71em";
                     }
@@ -155,7 +155,7 @@ function c3_axis(d3, params) {
             }
 
             function tickSize(d) {
-                var tickPosition = scale(d) + tickOffset;
+                var tickPosition = scale(d) + (tickCentered ? 0 : tickOffset);
                 return range[0] < tickPosition && tickPosition < range[1] ? innerTickSize : 0;
             }