add Scattercarpet.eventData method

- 🔪 its select method and reuse Scatter.select instead
  which is much DRYer.

Author: etpinard

src/traces/scattercarpet/event_data.js

@@ -0,0 +1,18 @@
+/**
+* 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';
+
+module.exports = function eventData(out, pt, trace, cd, pointNumber) {
+    var cdi = cd[pointNumber];
+
+    out.a = cdi.a;
+    out.b = cdi.b;
+
+    return out;
+};

src/traces/scattercarpet/index.js

@@ -17,7 +17,8 @@ ScatterCarpet.calc = require('./calc');
 ScatterCarpet.plot = require('./plot');
 ScatterCarpet.style = require('./style');
 ScatterCarpet.hoverPoints = require('./hover');
-ScatterCarpet.selectPoints = require('./select');
+ScatterCarpet.selectPoints = require('../scatter/select');
+ScatterCarpet.eventData = require('./event_data');
 
 ScatterCarpet.moduleType = 'trace';
 ScatterCarpet.name = 'scattercarpet';