MINUS_SIGN constant

Author: alexcjohnson

src/constants/numerical.js

@@ -47,5 +47,11 @@ module.exports = {
     /*
      * Are two values nearly equal? Compare to 1PPM
      */
-    ALMOST_EQUAL: 1 - 1e-6
+    ALMOST_EQUAL: 1 - 1e-6,
+
+    /*
+     * not a number, but for displaying numbers: the "minus sign" symbol is
+     * wider than the regular ascii dash "-"
+     */
+    MINUS_SIGN: '\u2212'
 };

src/plots/cartesian/axes.js

@@ -27,6 +27,7 @@ var ONEDAY = constants.ONEDAY;
 var ONEHOUR = constants.ONEHOUR;
 var ONEMIN = constants.ONEMIN;
 var ONESEC = constants.ONESEC;
+var MINUS_SIGN = constants.MINUS_SIGN;
 
 var MID_SHIFT = require('../../constants/alignment').MID_SHIFT;
 
@@ -1304,7 +1305,7 @@ function formatLog(ax, out, hover, extraPrecision, hideexp) {
             if(p === 0) out.text = 1;
             else if(p === 1) out.text = '10';
             else if(p > 1) out.text = '10<sup>' + p + '</sup>';
-            else out.text = '10<sup>\u2212' + -p + '</sup>';
+            else out.text = '10<sup>' + MINUS_SIGN + -p + '</sup>';
 
             out.fontSize *= 1.25;
         }
@@ -1387,7 +1388,7 @@ function numFormat(v, ax, fmtoverride, hover) {
         if(ax.hoverformat) tickformat = ax.hoverformat;
     }
 
-    if(tickformat) return d3.format(tickformat)(v).replace(/-/g, '\u2212');
+    if(tickformat) return d3.format(tickformat)(v).replace(/-/g, MINUS_SIGN);
 
     // 'epsilon' - rounding increment
     var e = Math.pow(10, -tickRound) / 2;
@@ -1437,7 +1438,7 @@ function numFormat(v, ax, fmtoverride, hover) {
     // add exponent
     if(exponent && exponentFormat !== 'hide') {
         var signedExponent;
-        if(exponent < 0) signedExponent = '\u2212' + -exponent;
+        if(exponent < 0) signedExponent = MINUS_SIGN + -exponent;
         else if(exponentFormat !== 'power') signedExponent = '+' + exponent;
         else signedExponent = String(exponent);
 
@@ -1463,11 +1464,10 @@ function numFormat(v, ax, fmtoverride, hover) {
     // put sign back in and return
     // replace standard minus character (which is technically a hyphen)
     // with a true minus sign
-    if(isNeg) return '\u2212' + v;
+    if(isNeg) return MINUS_SIGN + v;
     return v;
 }
 
-
 axes.subplotMatch = /^x([0-9]*)y([0-9]*)$/;
 
 // getSubplots - extract all combinations of axes we need to make plots for