add option to set minDiff to 1 from distinctVals

Author: archmoj

src/lib/search.js

@@ -71,7 +71,9 @@ exports.sorterDes = function(a, b) { return b - a; };
  * just be off by a rounding error
  * return the distinct values and the minimum difference between any two
  */
-exports.distinctVals = function(valsIn) {
+exports.distinctVals = function(valsIn, opts) {
+    var unitMinDiff = (opts || {}).unitMinDiff;
+
     var vals = valsIn.slice();  // otherwise we sort the original array...
     vals.sort(exports.sorterAsc); // undefined listed in the end - also works on IE11
 
@@ -80,7 +82,9 @@ exports.distinctVals = function(valsIn) {
         if(vals[last] !== BADNUM) break;
     }
 
-    var minDiff = (vals[last] - vals[0]) || 1;
+    var minDiff = 1;
+    if(!unitMinDiff) minDiff = (vals[last] - vals[0]) || 1;
+
     var errDiff = minDiff / (last || 1) / 10000;
     var newVals = [];
     var preV;

src/traces/bar/cross_trace_calc.js

@@ -175,20 +175,15 @@ function initBase(sa, calcTraces) {
 }
 
 function setGroupPositionsInOverlayMode(pa, sa, calcTraces, opts) {
-    var sieve;
-    var sieveOpts = {
-        sepNegVal: false,
-        overlapNoMerge: !opts.norm
-    };
-
-    var categoryOverlay = opts.xCat || opts.yCat;
-    if(categoryOverlay) {
-        sieve = new Sieve(calcTraces, sieveOpts);
-    }
-
     // update position axis and set bar offsets and widths
     for(var i = 0; i < calcTraces.length; i++) {
-        if(!categoryOverlay) sieve = new Sieve([calcTraces[i]], sieveOpts);
+        var calcTrace = calcTraces[i];
+
+        var sieve = new Sieve([calcTrace], {
+            unitMinDiff: opts.xCat || opts.yCat,
+            sepNegVal: false,
+            overlapNoMerge: !opts.norm
+        });
 
         // set bar offsets and widths, and update position axis
         setOffsetAndWidth(pa, sieve, opts);

src/traces/bar/sieve.js

@@ -48,7 +48,10 @@ function Sieve(traces, opts) {
     }
     this.positions = positions;
 
-    var dv = distinctVals(positions);
+    var dv = distinctVals(positions, {
+        unitMinDiff: opts.unitMinDiff
+    });
+
     this.distinctPositions = dv.vals;
     if(dv.vals.length === 1 && width1 !== Infinity) this.minDiff = width1;
     else this.minDiff = Math.min(dv.minDiff, width1);