clean up function now that alpha is not used directly

Author: archmoj

src/lib/gl_format_color.js

@@ -76,14 +76,11 @@ function formatColor(containerIn, opacityIn, len) {
     return colorOut;
 }
 
-function parseColorScale(cont, alpha) {
-    if(alpha === undefined) alpha = 1;
-
+function parseColorScale(cont) {
     var cOpts = Colorscale.extractOpts(cont);
 
-    var colorscale = cOpts.reversescale ?
-        Colorscale.flipScale(cOpts.colorscale) :
-        cOpts.colorscale;
+    var colorscale = cOpts.colorscale;
+    if(cOpts.reversescale) colorscale = Colorscale.flipScale(cOpts.colorscale);
 
     return colorscale.map(function(elem) {
         var index = elem[0];

src/traces/surface/convert.js

@@ -434,7 +434,7 @@ proto.update = function(data) {
     var sceneLayout = scene.fullSceneLayout;
     var surface = this.surface;
     var alpha = data.opacity;
-    var colormap = parseColorScale(data, alpha);
+    var colormap = parseColorScale(data);
     var scaleFactor = scene.dataScale;
     var xlen = data.z[0].length;
     var ylen = data._ylength;