add key description to display in tooltip

nv.d3.js

@@ -7780,6 +7780,7 @@ nv.models.pie = function() {
     , getValues = function(d) { return d.values }
     , getX = function(d) { return d.x }
     , getY = function(d) { return d.y }
+    , getDescription = function(d) { return d.description }
     , id = Math.floor(Math.random() * 10000) //Create semi-unique ID in case user doesn't select one
     , color = nv.utils.defaultColor()
     , valueFormat = d3.format(',.2f')
@@ -8069,6 +8070,12 @@ nv.models.pie = function() {
     getY = d3.functor(_);
     return chart;
   };
+  
+  chart.description = function(_) {
+    if (!arguments.length) return getDescription;
+    getDescription = _;
+    return chart;
+  };
 
   chart.showLabels = function(_) {
     if (!arguments.length) return showLabels;
@@ -8162,10 +8169,11 @@ nv.models.pieChart = function() {
   //------------------------------------------------------------
 
   var showTooltip = function(e, offsetElement) {
+    var tooltipLabel = pie.description()(e.point) || pie.x()(e.point)
     var left = e.pos[0] + ( (offsetElement && offsetElement.offsetLeft) || 0 ),
         top = e.pos[1] + ( (offsetElement && offsetElement.offsetTop) || 0),
         y = pie.valueFormat()(pie.y()(e.point)),
-        content = tooltip(pie.x()(e.point), y, e, chart);
+        content = tooltip(tooltipLabel, y, e, chart);
 
     nv.tooltip.show([left, top], content, e.value < 0 ? 'n' : 's', null, offsetElement);
   };
@@ -8344,7 +8352,7 @@ nv.models.pieChart = function() {
   chart.dispatch = dispatch;
   chart.pie = pie;
 
-  d3.rebind(chart, pie, 'valueFormat', 'values', 'x', 'y', 'id', 'showLabels', 'donutLabelsOutside', 'pieLabelsOutside', 'donut', 'labelThreshold');
+  d3.rebind(chart, pie, 'valueFormat', 'values', 'x', 'y', 'description', 'id', 'showLabels', 'donutLabelsOutside', 'pieLabelsOutside', 'donut', 'labelThreshold');
 
   chart.margin = function(_) {
     if (!arguments.length) return margin;

src/models/pie.js

@@ -11,6 +11,7 @@ nv.models.pie = function() {
     , getValues = function(d) { return d.values }
     , getX = function(d) { return d.x }
     , getY = function(d) { return d.y }
+    , getDescription = function(d) { return d.description }
     , id = Math.floor(Math.random() * 10000) //Create semi-unique ID in case user doesn't select one
     , color = nv.utils.defaultColor()
     , valueFormat = d3.format(',.2f')
@@ -300,6 +301,12 @@ nv.models.pie = function() {
     getY = d3.functor(_);
     return chart;
   };
+  
+  chart.description = function(_) {
+    if (!arguments.length) return getDescription;
+    getDescription = _;
+    return chart;
+  };
 
   chart.showLabels = function(_) {
     if (!arguments.length) return showLabels;

src/models/pieChart.js

@@ -32,10 +32,11 @@ nv.models.pieChart = function() {
   //------------------------------------------------------------
 
   var showTooltip = function(e, offsetElement) {
+    var tooltipLabel = pie.description()(e.point) || pie.x()(e.point)
     var left = e.pos[0] + ( (offsetElement && offsetElement.offsetLeft) || 0 ),
         top = e.pos[1] + ( (offsetElement && offsetElement.offsetTop) || 0),
         y = pie.valueFormat()(pie.y()(e.point)),
-        content = tooltip(pie.x()(e.point), y, e, chart);
+        content = tooltip(tooltipLabel, y, e, chart);
 
     nv.tooltip.show([left, top], content, e.value < 0 ? 'n' : 's', null, offsetElement);
   };
@@ -214,7 +215,7 @@ nv.models.pieChart = function() {
   chart.dispatch = dispatch;
   chart.pie = pie;
 
-  d3.rebind(chart, pie, 'valueFormat', 'values', 'x', 'y', 'id', 'showLabels', 'donutLabelsOutside', 'pieLabelsOutside', 'donut', 'labelThreshold');
+  d3.rebind(chart, pie, 'valueFormat', 'values', 'x', 'y', 'description', 'id', 'showLabels', 'donutLabelsOutside', 'pieLabelsOutside', 'donut', 'labelThreshold');
 
   chart.margin = function(_) {
     if (!arguments.length) return margin;