Morris.Donut#select(idx) for selecting donut segments (ref #79).

lib/morris.donut.coffee

@@ -85,13 +85,14 @@ class Morris.Donut
     idx = 0
     for d in @data
       if d.value == max_value
-        @select @segments[idx]
+        @select idx
         break
       idx += 1
 
-  # @private
-  select: (segment) =>
+  # Select the segment at the given index.
+  select: (idx) =>
     s.deselect() for s in @segments
+    segment = @segments[idx]
     segment.select()
     @setLabels segment.data.label, @options.formatter(segment.data.value)
 

morris.js

@@ -143,7 +143,7 @@
       for (_k = 0, _len2 = _ref2.length; _k < _len2; _k++) {
         d = _ref2[_k];
         if (d.value === max_value) {
-          this.select(this.segments[idx]);
+          this.select(idx);
           break;
         }
         _results.push(idx += 1);
@@ -151,13 +151,14 @@
       return _results;
     };
 
-    Donut.prototype.select = function(segment) {
-      var s, _i, _len, _ref;
+    Donut.prototype.select = function(idx) {
+      var s, segment, _i, _len, _ref;
       _ref = this.segments;
       for (_i = 0, _len = _ref.length; _i < _len; _i++) {
         s = _ref[_i];
         s.deselect();
       }
+      segment = this.segments[idx];
       segment.select();
       return this.setLabels(segment.data.label, this.options.formatter(segment.data.value));
     };