fixups (from AJ's review)

Author: etpinard

src/components/annotations/calc_autorange.js

@@ -42,37 +42,21 @@ function annAutorange(gd) {
 }
 
 function calcAxisExpansion(ann, ax) {
-    var headSize = 3 * ann.arrowsize * ann.arrowwidth || 0;
-    var startHeadSize = 3 * ann.startarrowsize * ann.arrowwidth || 0;
-
     var axId = ax._id;
     var letter = axId.charAt(0);
     var pos = ann[letter];
     var apos = ann['a' + letter];
     var ref = ann[letter + 'ref'];
     var aref = ann['a' + letter + 'ref'];
-    var shift = ann[letter + 'shift'];
     var padplus = ann['_' + letter + 'padplus'];
     var padminus = ann['_' + letter + 'padminus'];
-
-    var headPlus, headMinus;
-    var startHeadPlus, startHeadMinus;
-
-    switch(letter) {
-        case 'x':
-            headPlus = headSize + shift;
-            headMinus = headSize - shift;
-            startHeadPlus = startHeadSize + shift;
-            startHeadMinus = startHeadSize - shift;
-            break;
-        case 'y':
-            headPlus = headSize - shift;
-            headMinus = headSize + shift;
-            startHeadPlus = startHeadSize - shift;
-            startHeadMinus = startHeadSize + shift;
-            break;
-    }
-
+    var shift = {x: 1, y: -1}[letter] * ann[letter + 'shift'];
+    var headSize = 3 * ann.arrowsize * ann.arrowwidth || 0;
+    var headPlus = headSize + shift;
+    var headMinus = headSize - shift;
+    var startHeadSize = 3 * ann.startarrowsize * ann.arrowwidth || 0;
+    var startHeadPlus = startHeadSize + shift;
+    var startHeadMinus = startHeadSize - shift;
     var extremes;
 
     if(aref === ref) {

src/plots/cartesian/axes.js

@@ -48,7 +48,6 @@ axes.getFromId = axisIds.getFromId;
 axes.getFromTrace = axisIds.getFromTrace;
 
 var autorange = require('./autorange');
-axes.expand = autorange.expand;
 axes.getAutoRange = autorange.getAutoRange;
 axes.findExtremes = autorange.findExtremes;
 

src/plots/plots.js

@@ -2458,7 +2458,6 @@ plots.doCalcdata = function(gd, traces) {
     for(i = 0; i < fullData.length; i++) {
         trace = fullData[i];
 
-        // find array attributes in trace
         trace._arrayAttrs = PlotSchema.findArrayAttributes(trace);
 
         // keep track of trace extremes (for autorange) in here