Fixed #501: round-off errors of zero on the y-axis

HISTORY.md

@@ -2,6 +2,13 @@
 http://visjs.org
 
 
+## not yet released, version 3.7.3
+
+### Graph2d
+
+- Fixed round-off errors of zero on the y-axis.
+
+
 ## 2014-12-09, version 3.7.2
 
 ### Timeline

lib/timeline/DataStep.js

@@ -189,7 +189,10 @@ DataStep.prototype.previous = function() {
  * @return {String}  current The current date
  */
 DataStep.prototype.getCurrent = function(decimals) {
-  var toPrecision = '' + Number(this.current).toPrecision(5);
+  // prevent round-off errors when close to zero
+  var current = (Math.abs(this.current) < this.step / 2) ? 0 : this.current;
+  var toPrecision = '' + Number(current).toPrecision(5);
+
   // If decimals is specified, then limit or extend the string as required
   if(decimals !== undefined && !isNaN(Number(decimals))) {
     // If string includes exponent, then we need to add it to the end