Revert "removed colorbar leftover"

This reverts commit aa41f28.

Author: monfera

src/traces/parcoords/colorbar.js

@@ -0,0 +1,52 @@
+/**
+* Copyright 2012-2017, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+
+'use strict';
+
+var isNumeric = require('fast-isnumeric');
+
+var Lib = require('../../lib');
+var Plots = require('../../plots/plots');
+var Colorscale = require('../../components/colorscale');
+var drawColorbar = require('../../components/colorbar/draw');
+
+
+module.exports = function colorbar(gd, cd) {
+    var trace = cd[0].trace,
+        line = trace.line,
+        cbId = 'cb' + trace.uid;
+
+    gd._fullLayout._infolayer.selectAll('.' + cbId).remove();
+
+    if((line === undefined) || !line.showscale) {
+        Plots.autoMargin(gd, cbId);
+        return;
+    }
+
+    var vals = line.color,
+        cmin = line.cmin,
+        cmax = line.cmax;
+
+    if(!isNumeric(cmin)) cmin = Lib.aggNums(Math.min, null, vals);
+    if(!isNumeric(cmax)) cmax = Lib.aggNums(Math.max, null, vals);
+
+    var cb = cd[0].t.cb = drawColorbar(gd, cbId);
+    var sclFunc = Colorscale.makeColorScaleFunc(
+        Colorscale.extractScale(
+            line.colorscale,
+            cmin,
+            cmax
+        ),
+        { noNumericCheck: true }
+    );
+
+    cb.fillcolor(sclFunc)
+        .filllevels({start: cmin, end: cmax, size: (cmax - cmin) / 254})
+        .options(line.colorbar)();
+};

src/traces/parcoords/index.js

@@ -14,6 +14,7 @@ Parcoords.attributes = require('./attributes');
 Parcoords.supplyDefaults = require('./defaults');
 Parcoords.calc = require('./calc');
 Parcoords.plot = require('./plot');
+Parcoords.colorbar = require('./colorbar');
 
 Parcoords.moduleType = 'trace';
 Parcoords.name = 'parcoords';