Improved tickmode sync logic to round ticks

Author: filipesantiagoAM

src/plots/cartesian/axes.js

@@ -1222,8 +1222,14 @@ function syncTicks(ax) {
 
             // get the tick for the current axis based on position
             var vali = ax.p2l(pos);
-
+            var val1 = ax.p2l(pos - 0.5);
+            var val2 = ax.p2l(pos + 0.5);
+            var d = 1 + Math.round(Math.log10(Math.abs(val2 - val1)));
+            var e = Math.pow(10, -d);
+            var valR = Math.round(vali * e) / e;
+            var objR = axes.tickText(ax, valR);
             var obj = axes.tickText(ax, vali);
+            obj.text = objR.text;
 
             // assign minor ticks
             if(baseAxis._vals[i].minor) {