Change notchwidth convention to Matlab, d=0.25

Author: krassowski

src/traces/box/attributes.js

@@ -97,13 +97,13 @@ module.exports = {
         valType: 'number',
         min: 0,
         max: 1,
-        dflt: 0.5,
+        dflt: 0.25,
         role: 'style',
         editType: 'calcIfAutorange',
         description: [
-            'Sets the width of the notches relative to',
+            'Sets the width of the notches inversely proportional to',
             'the box\' width.',
-            'For example, with 1, the whiskers are as wide as the box(es).'
+            'For example, with 0, the notches are as wide as the box(es).'
         ].join(' ')
     },
     boxpoints: {

src/traces/box/plot.js

@@ -102,7 +102,7 @@ function plotBoxAndWhiskers(sel, axes, trace, t) {
     var bPosPxOffset = t.bPosPxOffset || 0;
     var whiskerWidth = trace.whiskerwidth || 0;
     var notched = trace.notched || false;
-    var nw = notched ? trace.notchwidth : 1;
+    var nw = notched ? 1 - trace.notchwidth : 1;
 
     // to support for one-sided box
     var bdPos0;

test/image/baselines/box_horz_notched.png

@@ -144,10 +144,10 @@
             "color":"#1c9099"
          },
          "type":"box",
-         "name":"Notch width = 0.8",
+         "name":"Notch width = 0.1",
          "notched":true,
          "orientation": "h",
-         "notchwidth":0.8
+         "notchwidth":0.1
       },
       {
          "x":[
@@ -219,10 +219,10 @@
             "color":"#1c9099"
          },
          "type":"box",
-         "name":"Notch width = 1",
+         "name":"Notch width = 0",
          "notched":true,
          "orientation": "h",
-         "notchwidth":1
+         "notchwidth":0
       },
       {
          "x":[

test/image/baselines/box_notched.png

@@ -143,8 +143,8 @@
             "color":"#1c9099"
          },
          "type":"box",
-         "name":"Notch width = 0.8",
-         "notchwidth":0.8
+         "name":"Notch width = 0.1",
+         "notchwidth":0.1
       },
       {
          "y":[
@@ -216,9 +216,9 @@
             "color":"#1c9099"
          },
          "type":"box",
-         "name":"Notch width = 1",
+         "name":"Notch width = 0",
          "notched":true,
-         "notchwidth":1
+         "notchwidth":0
       },
       {
          "y":[