Implement bar labels (issue 34)

src/plot_api/helpers.js

@@ -298,7 +298,7 @@ exports.cleanData = function(data, existingData) {
             trace.scene = Plots.subplotsRegistry.gl3d.cleanId(trace.scene);
         }
 
-        if(!Registry.traceIs(trace, 'pie')) {
+        if(!Registry.traceIs(trace, 'pie') && !Registry.traceIs(trace, 'bar')) {
             if(Array.isArray(trace.textposition)) {
                 trace.textposition = trace.textposition.map(cleanTextPosition);
             }

src/traces/bar/attributes.js

@@ -12,8 +12,15 @@ var scatterAttrs = require('../scatter/attributes');
 var colorAttributes = require('../../components/colorscale/color_attributes');
 var errorBarAttrs = require('../../components/errorbars/attributes');
 var colorbarAttrs = require('../../components/colorbar/attributes');
+var fontAttrs = require('../../plots/font_attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
+var extendDeep = require('../../lib/extend').extendDeep;
+
+var textFontAttrs = extendDeep({}, fontAttrs);
+textFontAttrs.family.arrayOk = true;
+textFontAttrs.size.arrayOk = true;
+textFontAttrs.color.arrayOk = true;
 
 var scatterMarkerAttrs = scatterAttrs.marker;
 var scatterMarkerLineAttrs = scatterMarkerAttrs.line;
@@ -40,8 +47,38 @@ module.exports = {
     y: scatterAttrs.y,
     y0: scatterAttrs.y0,
     dy: scatterAttrs.dy,
+
     text: scatterAttrs.text,
 
+    textposition: {
+        valType: 'enumerated',
+        role: 'info',
+        values: ['inside', 'outside', 'auto', 'none'],
+        dflt: 'none',
+        arrayOk: true,
+        description: [
+            'Specifies the location of the `text`.',
+            '*inside* positions `text` inside, next to the bar end',
+            '(rotated and scaled if needed).',
+            '*outside* positions `text` outside, next to the bar end',
+            '(scaled if needed).',
+            '*auto* positions `text` inside or outside',
+            'so that `text` size is maximized.'
+        ].join(' ')
+    },
+
+    textfont: extendFlat({}, textFontAttrs, {
+        description: 'Sets the font used for `text`.'
+    }),
+
+    insidetextfont: extendFlat({}, textFontAttrs, {
+        description: 'Sets the font used for `text` lying inside the bar.'
+    }),
+
+    outsidetextfont: extendFlat({}, textFontAttrs, {
+        description: 'Sets the font used for `text` lying outside the bar.'
+    }),
+
     orientation: {
         valType: 'enumerated',
         role: 'info',

src/traces/bar/defaults.js

@@ -23,6 +23,8 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
         return Lib.coerce(traceIn, traceOut, attributes, attr, dflt);
     }
 
+    var coerceFont = Lib.coerceFont;
+
     var len = handleXYDefaults(traceIn, traceOut, coerce);
     if(!len) {
         traceOut.visible = false;
@@ -33,8 +35,20 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     coerce('base');
     coerce('offset');
     coerce('width');
+
     coerce('text');
 
+    var textPosition = coerce('textposition');
+
+    var hasBoth = Array.isArray(textPosition) || textPosition === 'auto',
+        hasInside = hasBoth || textPosition === 'inside',
+        hasOutside = hasBoth || textPosition === 'outside';
+    if(hasInside || hasOutside) {
+        var textFont = coerceFont(coerce, 'textfont', layout.font);
+        if(hasInside) coerceFont(coerce, 'insidetextfont', textFont);
+        if(hasOutside) coerceFont(coerce, 'outsidetextfont', textFont);
+    }
+
     handleStyleDefaults(traceIn, traceOut, coerce, defaultColor, layout);
 
     // override defaultColor for error bars with defaultLine