add layout.barcornerradius property

Author: emilykl

src/traces/bar/layout_attributes.js

@@ -51,5 +51,14 @@ module.exports = {
             'Sets the gap (in plot fraction) between bars of',
             'the same location coordinate.'
         ].join(' ')
-    }
+    },
+    barcornerradius: {
+        valType: 'any',
+        dflt: 0,
+        editType: 'plot',
+        description: [
+            'Sets the rounding of corners. May be an integer number of pixels,',
+            'or a percentage of bar width(as a string).'
+        ].join(' ')
+    },
 };

src/traces/bar/layout_defaults.js

@@ -47,4 +47,5 @@ module.exports = function(layoutIn, layoutOut, fullData) {
 
     coerce('bargap', (shouldBeGapless && !gappedAnyway) ? 0 : 0.2);
     coerce('bargroupgap');
+    coerce('barcornerradius');
 };

src/traces/bar/plot.js

@@ -249,7 +249,7 @@ function plot(gd, plotinfo, cdModule, traceLayer, opts, makeOnCompleteCallback)
                     );
                 }
             }
-            var r = calcCornerRadius(trace.marker.cornerradius);
+            var r = calcCornerRadius(trace.marker.cornerradius || fullLayout.barcornerradius);
 
             var path;
             if(r && isHorizontal) {

test/image/mocks/bar-rounded-corners.json

@@ -21,13 +21,12 @@
               ],
               "x": [20, 14, 2, 18],
               "type": "bar",
-              "marker": {"cornerradius": "30%"},
               "orientation": "h",
             "xaxis": "x2",
             "yaxis": "y2"
           }
 
     ],
-    "layout": {"grid": {"rows": 1, "columns": 2, "pattern": "independent"}}
+    "layout": {"grid": {"rows": 1, "columns": 2, "pattern": "independent"}, "barcornerradius": "30%"}
   }
 

test/plot-schema.json

@@ -14776,6 +14776,12 @@
     "zoomScale"
    ],
    "layoutAttributes": {
+    "barcornerradius": {
+     "description": "Sets the rounding of corners. May be an integer number of pixels, or a percentage of bar width(as a string).",
+     "dflt": 0,
+     "editType": "plot",
+     "valType": "any"
+    },
     "bargap": {
      "description": "Sets the gap (in plot fraction) between bars of adjacent location coordinates.",
      "editType": "calc",
@@ -32068,6 +32074,12 @@
     "showLegend"
    ],
    "layoutAttributes": {
+    "barcornerradius": {
+     "description": "Sets the rounding of corners. May be an integer number of pixels, or a percentage of bar width(as a string).",
+     "dflt": 0,
+     "editType": "plot",
+     "valType": "any"
+    },
     "bargap": {
      "description": "Sets the gap (in plot fraction) between bars of adjacent location coordinates.",
      "editType": "calc",