Fix bar stack - #192

c3.js

@@ -193,7 +193,7 @@
             __axis_y_label = getConfig(['axis', 'y', 'label'], {}),
             __axis_y_inner = getConfig(['axis', 'y', 'inner'], false),
             __axis_y_tick_format = getConfig(['axis', 'y', 'tick', 'format']),
-            __axis_y_padding = getConfig(['axis', 'y', 'padding'], {}),
+            __axis_y_padding = getConfig(['axis', 'y', 'padding']),
             __axis_y_ticks = getConfig(['axis', 'y', 'ticks'], 10),
             __axis_y2_show = getConfig(['axis', 'y2', 'show'], false),
             __axis_y2_max = getConfig(['axis', 'y2', 'max']),
@@ -202,7 +202,7 @@
             __axis_y2_label = getConfig(['axis', 'y2', 'label'], {}),
             __axis_y2_inner = getConfig(['axis', 'y2', 'inner'], false),
             __axis_y2_tick_format = getConfig(['axis', 'y2', 'tick', 'format']),
-            __axis_y2_padding = getConfig(['axis', 'y2', 'padding'], {}),
+            __axis_y2_padding = getConfig(['axis', 'y2', 'padding']),
             __axis_y2_ticks = getConfig(['axis', 'y2', 'ticks'], 10);
 
         // grid
@@ -1781,7 +1781,7 @@
         }
         function getDataLabelWidth(min, max) {
             var widths = [], paddingCoef = 1.3;
-            d3.select('svg').selectAll('.dummy')
+            selectChart.select('svg').selectAll('.dummy')
                 .data([min, max])
               .enter().append('text')
                 .text(function (d) { return d; })
@@ -2408,17 +2408,17 @@
         function generateGetBarPoints(barIndices, isSub) {
             var barTargetsNum = barIndices.__max__ + 1,
                 barW = getBarW(xAxis, barTargetsNum),
-                x = getBarX(barW, barTargetsNum, barIndices, !!isSub),
+                barX = getBarX(barW, barTargetsNum, barIndices, !!isSub),
-                y = getBarY(!!isSub),
+                barY = getBarY(!!isSub),
                 barOffset = getBarOffset(barIndices, !!isSub),
                 yScale = isSub ? getSubYScale : getYScale;
             return function (d, i) {
                 var y0 = yScale(d.id)(0),
                     offset = barOffset(d, i) || y0, // offset is for stacked bar chart
-                    posX = x(d), posY = y(d);
+                    posX = barX(d), posY = barY(d);
                 // fix posY not to overflow opposite quadrant
                 if (__axis_rotated) {
-                    if ((d.value > 0 && posY < offset) || (d.value < 0 && posY > offset)) { posY = offset; }
+                    if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) { posY = y0; }
                 }
                 // 4 points that make a bar
                 return [