simplification for bar

Author: archmoj

src/traces/bar/cross_trace_calc.js

@@ -436,20 +436,12 @@ function setBarCenterAndWidth(pa, sieve) {
         var barwidth = t.barwidth;
         var barwidthIsArray = Array.isArray(barwidth);
 
-        var trace = calcTrace[0].trace;
-        var isPeriod = !!trace[pLetter + 'periodalignment'];
-
         for(var j = 0; j < calcTrace.length; j++) {
             var calcBar = calcTrace[j];
 
             // store the actual bar width and position, for use by hover
             var width = calcBar.w = barwidthIsArray ? barwidth[j] : barwidth;
             calcBar[pLetter] = calcBar.p + (poffsetIsArray ? poffset[j] : poffset) + width / 2;
-
-            if(isPeriod) {
-                calcBar.wPeriod =
-                    calcBar[pLetter + 'End'] - calcBar[pLetter + 'Start'];
-            }
         }
     }
 }

src/traces/bar/hover.js

@@ -70,7 +70,7 @@ function hoverOnBars(pointData, xval, yval, hovermode, opts) {
     var minPos = isClosest ?
         thisBarMinPos : period ?
         function(di) {
-            return di.p + periodLength(di) / 2 - di.wPeriod;
+            return di.p - periodLength(di) / 2;
         } :
         function(di) {
             /*