Gah, another piece of code missing. Fixed.

diff --git a/dygraph.js b/dygraph.js
index 6ab7606..45ccd7b 100644 (file)
--- a/dygraph.js
+++ b/dygraph.js
@@ -397,6 +397,7 @@ Dygraph.prototype.toDomYCoord = function(y, axis) {
   if (pct == null) {
     return null;
   }
+  var area = this.plotter_.area;
   return area.y + pct * area.h;
 }