Add support for startAngle and endAngle on pie chart

examples/pieChart.html

@@ -100,6 +100,10 @@ nv.addGraph(function() {
         .height(height)
         .donut(true);
 
+    chart.pie
+        .startAngle(function(d) { return d.startAngle/2 -Math.PI/2 })
+        .endAngle(function(d) { return d.endAngle/2 -Math.PI/2 });
+
       d3.select("#test2")
           //.datum(historicalBarChart)
           .datum([testdata])

src/models/pie.js

@@ -19,6 +19,8 @@ nv.models.pie = function() {
     , labelThreshold = .02 //if slice percentage is under this, don't show label
     , donut = false
     , labelSunbeamLayout = false
+    , startAngle = false
+    , endAngle = false
     , dispatch = d3.dispatch('chartClick', 'elementClick', 'elementDblClick', 'elementMouseover', 'elementMouseout')
     ;
 
@@ -65,6 +67,8 @@ nv.models.pie = function() {
       var arc = d3.svg.arc()
                   .outerRadius(arcRadius);
 
+      if (startAngle) arc.startAngle(startAngle)
+      if (endAngle) arc.endAngle(endAngle);
       if (donut) arc.innerRadius(radius / 2);
 
 
@@ -318,6 +322,18 @@ nv.models.pie = function() {
     return chart;
   };
 
+  chart.startAngle = function(_) {
+    if (!arguments.length) return startAngle;
+    startAngle = _;
+    return chart;
+  };
+
+  chart.endAngle = function(_) {
+    if (!arguments.length) return endAngle;
+    endAngle = _;
+    return chart;
+  };
+
   chart.id = function(_) {
     if (!arguments.length) return id;
     id = _;