Make fixed factor optional

Author: jsmassa

www/mappingScreen.js

@@ -48,10 +48,12 @@ setupMapping = function(mappingType) {
     setupArrows();
     setupFactorMenu(dynamicFactors);
 
-    var xFixed = canvasStyle.xFixedFactor[factors.fixedPosition];
-    var yFixed = canvasStyle.yFixedFactor;
+    if (fixedFactor != "") {
+        var xFixed = canvasStyle.xFixedFactor[factors.fixedPosition];
+        var yFixed = canvasStyle.yFixedFactor;
 
-    drawFactorIcon(fixedFactor, xFixed,  yFixed, true);
+        drawFactorIcon(fixedFactor, xFixed,  yFixed, true);
+    }
 
     // Setup buttons
     var halfButton = canvasStyle.buttonSize / 2;

www/settingsScreen.js

@@ -158,7 +158,7 @@ factorRow = function(factorKey, used, defaultName, defaultImg, defaultAudio) {
 listFactors = function(mappingType) {
 
     var fixedFactorElement = document.getElementById("fixed-factor-" + mappingType);
-    populateSelection(fixedFactorElement, "images", settings.factors[mappingType].fixed, false);
+    populateSelection(fixedFactorElement, "images", settings.factors[mappingType].fixed, true);
 
     var factorTable = document.getElementById("factor-media-" + mappingType);
     for (var factorKey in settings.factorMedia){