revise legend dflt

Author: archmoj

src/components/legend/defaults.js

@@ -10,7 +10,7 @@ var basePlotLayoutAttributes = require('../../plots/layout_attributes');
 var helpers = require('./helpers');
 
 function getLegendName(id) {
-    return 'legend' + (id || '');
+    return 'legend' + (id > 1 ? id : '');
 }
 
 function groupDefaults(id, layoutIn, layoutOut, fullData) {
@@ -157,7 +157,7 @@ function groupDefaults(id, layoutIn, layoutOut, fullData) {
 
 module.exports = function legendDefaults(layoutIn, layoutOut, fullData) {
     var i;
-    var legends = [0];
+    var legends = [1];
 
     for(i = 0; i < fullData.length; i++) {
         Lib.pushUnique(legends, fullData[i].legend);
@@ -167,7 +167,7 @@ module.exports = function legendDefaults(layoutIn, layoutOut, fullData) {
     for(i = 0; i < legends.length; i++) {
         var id = legends[i];
         var name = getLegendName(id);
-        if(id && !layoutIn[name]) continue;
+        if(id > 1 && !layoutIn[name]) continue;
 
         groupDefaults(id, layoutIn, layoutOut, fullData);
 

src/components/legend/draw.js

@@ -30,7 +30,8 @@ module.exports = function draw(gd, opts) {
     } else {
         var legends = gd._fullLayout._legends;
         for(var i = 0; i < legends.length; i++) {
-            var legendObj = gd._fullLayout['legend' + (legends[i] || '')];
+            var id = legends[i];
+            var legendObj = gd._fullLayout['legend' + (id > 1 ? id : '')];
             drawOne(gd, legendObj);
         }
     }
@@ -887,5 +888,6 @@ function getYanchor(legendObj) {
 }
 
 function getId(legendObj) {
-    return legendObj._id || '';
+    var id = legendObj._id;
+    return id > 1 ? id : '';
 }

src/plots/attributes.js

@@ -34,12 +34,12 @@ module.exports = {
     },
     legend: {
         valType: 'number',
-        dflt: 0,
-        min: 2,
+        dflt: 1,
+        min: 1,
         editType: 'style',
         description: [
             'Sets the legend id to show this trace in.',
-            'If *0* (the default value), it refers to `layout.legend`.',
+            'If *1* (the default value), it refers to `layout.legend`.',
             'If *2*, it refers to `layout.legend2`, and so on.'
         ].join(' ')
     },