fixup cartesian dragbox module

- use 'drawOne' mehtod instead of 'draw' as per PR #833
- use Registry instead of Plotly[module] as per PR #845

Author: etpinard

src/plots/cartesian/dragbox.js

@@ -13,6 +13,7 @@ var d3 = require('d3');
 var tinycolor = require('tinycolor2');
 
 var Plotly = require('../../plotly');
+var Registry = require('../../registry');
 var Lib = require('../../lib');
 var svgTextUtils = require('../../lib/svg_text_utils');
 var Color = require('../../components/color');
@@ -512,20 +513,23 @@ module.exports = function dragBox(gd, plotinfo, x, y, w, h, ns, ew) {
             Axes.doTicks(gd, activeAxIds[i], true);
         }
 
-        function redrawObjs(objArray, module) {
-            var obji;
+        function redrawObjs(objArray, method) {
             for(i = 0; i < objArray.length; i++) {
-                obji = objArray[i];
+                var obji = objArray[i];
+
                 if((ew && activeAxIds.indexOf(obji.xref) !== -1) ||
                     (ns && activeAxIds.indexOf(obji.yref) !== -1)) {
-                    module.draw(gd, i);
+                    method(gd, i);
                 }
             }
         }
 
-        redrawObjs(fullLayout.annotations || [], Plotly.Annotations);
-        redrawObjs(fullLayout.shapes || [], Plotly.Shapes);
-        redrawObjs(fullLayout.images || [], Plotly.Images);
+        // annotations and shapes 'draw' method is slow,
+        // use the finer-grained 'drawOne' method instead
+
+        redrawObjs(fullLayout.annotations || [], Registry.getComponentMethod('annotations', 'drawOne'));
+        redrawObjs(fullLayout.shapes || [], Registry.getComponentMethod('shapes', 'drawOne'));
+        redrawObjs(fullLayout.images || [], Registry.getComponentMethod('images', 'draw'));
     }
 
     function doubleClick() {