Use alpha in more places

Author: camdecoster

src/components/drawing/index.js

@@ -514,10 +514,11 @@ function gradientWithBounds(sel, gd, gradientID, type, colorscale, prop, start,
             stops.enter().append('stop');
 
             stops.each(function (d) {
+                var c = Color.color(d[1]);
                 d3.select(this).attr({
                     offset: d[0] + '%',
                     'stop-color': Color.rgb(d[1]),
-                    'stop-opacity': Color.opacity(d[1])
+                    'stop-opacity': c.alpha()
                 });
             });
         });
@@ -583,8 +584,9 @@ drawing.pattern = function (
     var patternTag;
     var patternAttrs = {};
 
+    var fgC = Color.color(fgcolor);
     var fgRGB = Color.rgb(fgcolor);
-    var fgAlpha = Color.opacity(fgcolor);
+    var fgAlpha = fgC.alpha();
     var opacity = fgopacity * fgAlpha;
 
     switch (shape) {
@@ -817,8 +819,9 @@ drawing.pattern = function (
             });
 
             if (bgcolor) {
+                var bgC = Color.color(bgcolor);
                 var bgRGB = Color.rgb(bgcolor);
-                var bgAlpha = Color.opacity(bgcolor);
+                var bgAlpha = bgC.alpha();
 
                 var rects = el.selectAll('rect').data([0]);
                 rects.exit().remove();

src/traces/sankey/render.js

@@ -311,9 +311,9 @@ function linkModel(d, l, i) {
         pointNumber: l.pointNumber,
         link: l,
         rgb: Color.rgb(l.color),
-        alpha: Color.opacity(l.color),
+        alpha: Color.color(l.color).alpha(),
         hoverRgb: Color.rgb(l.hovercolor),
-        hoverAlpha: Color.opacity(l.hovercolor),
+        hoverAlpha: Color.color(l.hovercolor).alpha(),
         linkPath: linkPath,
         linkLineColor: d.linkLineColor,
         linkLineWidth: d.linkLineWidth,
@@ -575,7 +575,7 @@ function nodeModel(d, n) {
         horizontal: d.horizontal,
         darkBackground: Color.color(n.color).isDark(),
         rgb: Color.rgb(n.color),
-        alpha: Color.opacity(n.color),
+        alpha: Color.color(n.color).alpha(),
         valueFormat: d.valueFormat,
         valueSuffix: d.valueSuffix,
         sankey: d.sankey,