Add automargin to pie traces with outside text labels

src/plot_api/plot_api.js

@@ -290,6 +290,17 @@ function plot(gd, data, layout, config) {
         subroutines.drawMarginPushers(gd);
         Axes.allowAutoMargin(gd);
 
+        // TODO can this be moved elsewhere?
+        if(fullLayout._has('pie')) {
+            var fullData = gd._fullData;
+            for(var i = 0; i < fullData.length; i++) {
+                var trace = fullData[i];
+                if(trace.type === 'pie' && trace.automargin) {
+                    Plots.allowAutoMargin(gd, 'pie.' + trace.uid + '.automargin');
+                }
+            }
+        }
+
         Plots.doAutoMargin(gd);
         return Plots.previousPromises(gd);
     }

src/traces/pie/attributes.js

@@ -187,6 +187,15 @@ module.exports = {
     outsidetextfont: extendFlat({}, textFontAttrs, {
         description: 'Sets the font used for `textinfo` lying outside the sector.'
     }),
+    automargin: {
+        valType: 'boolean',
+        dflt: false,
+        role: 'info',
+        editType: 'plot',
+        description: [
+            'Determines whether outside text labels can push the margins.'
+        ].join(' ')
+    },
 
     title: {
         text: {

src/traces/pie/defaults.js

@@ -64,6 +64,12 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
             moduleHasTextangle: false,
             moduleHasInsideanchor: false
         });
+
+        var hasBoth = Array.isArray(textposition) || textposition === 'auto';
+        var hasOutside = hasBoth || textposition === 'outside';
+        if(hasOutside) {
+            coerce('automargin');
+        }
     }
 
     handleDomainDefaults(traceOut, layout, coerce);

src/traces/pie/plot.js

@@ -10,6 +10,7 @@
 
 var d3 = require('d3');
 
+var Plots = require('../../plots/plots');
 var Fx = require('../../components/fx');
 var Color = require('../../components/color');
 var Drawing = require('../../components/drawing');
@@ -22,9 +23,10 @@ var isValidTextValue = require('../../lib').isValidTextValue;
 
 function plot(gd, cdModule) {
     var fullLayout = gd._fullLayout;
+    var gs = fullLayout._size;
 
     prerenderTitles(cdModule, gd);
-    layoutAreas(cdModule, fullLayout._size);
+    layoutAreas(cdModule, gs);
 
     var plotGroups = Lib.makeTraceGroups(fullLayout._pielayer, cdModule, 'trace').each(function(cd) {
         var plotGroup = d3.select(this);
@@ -228,7 +230,7 @@ function plot(gd, cdModule) {
                 if(trace.title.position === 'middle center') {
                     transform = positionTitleInside(cd0);
                 } else {
-                    transform = positionTitleOutside(cd0, fullLayout._size);
+                    transform = positionTitleOutside(cd0, gs);
                 }
 
                 titleText.attr('transform',
@@ -241,6 +243,31 @@ function plot(gd, cdModule) {
             if(hasOutsideText) scootLabels(quadrants, trace);
 
             plotTextLines(slices, trace);
+
+            if(hasOutsideText && trace.automargin) {
+                // TODO if we ever want to improve perf,
+                // we could reuse the textBB computed above together
+                // with the sliceText transform info
+                var traceBbox = Drawing.bBox(plotGroup.node());
+
+                var domain = trace.domain;
+                var vpw = gs.w * (domain.x[1] - domain.x[0]);
+                var vph = gs.h * (domain.y[1] - domain.y[0]);
+                var xgap = (0.5 * vpw - cd0.r) / gs.w;
+                var ygap = (0.5 * vph - cd0.r) / gs.h;
+
+                Plots.autoMargin(gd, 'pie.' + trace.uid + '.automargin', {
+                    xl: domain.x[0] - xgap,
+                    xr: domain.x[1] + xgap,
+                    yb: domain.y[0] - ygap,
+                    yt: domain.y[1] + ygap,
+                    l: Math.max(cd0.cx - cd0.r - traceBbox.left, 0),
+                    r: Math.max(traceBbox.right - (cd0.cx + cd0.r), 0),
+                    b: Math.max(traceBbox.bottom - (cd0.cy + cd0.r), 0),
+                    t: Math.max(cd0.cy - cd0.r - traceBbox.top, 0),
+                    pad: 5
+                });
+            }
         });
     });
 

test/image/mocks/pie_automargin-margin0.json

@@ -0,0 +1,22 @@
+{
+  "data": [
+    {
+      "values": [1, 2, 3, 4, 5],
+      "labels": ["apples", "oranges", "blueberries", "lemons", "watermelon"],
+      "marker": {
+        "colors": ["rgba(255,0,0,0.5)", "orange", "blue", "yellow", "green"]
+      },
+      "text": ["red delicious", "mandarin", "high bush", "meyer", "jubilee"],
+      "textinfo": "label+text+value+percent",
+      "textposition": "outside",
+      "automargin": true,
+      "type": "pie"
+    }
+  ],
+  "layout": {
+    "height": 400,
+    "width": 400,
+    "margin": {"t": 0, "b": 0, "l": 0, "r": 0},
+    "showlegend": false
+  }
+}

test/image/mocks/pie_automargin.json

@@ -0,0 +1,23 @@
+{
+  "data": [
+    {
+      "type": "pie",
+      "labels": ["Olive Development", "Gap Development", "Gap Extension", "Gap Wildcat", "Olive Injection", "Olive Wildcat"],
+      "values": [39.4, 54.1, 3.08, 2.98, 0.411, 0.685],
+      "textinfo": "label+percent",
+      "hole": 0.5,
+      "automargin": true
+    }
+  ],
+  "layout": {
+    "legend": {
+      "orientation": "h",
+      "y": 1.2,
+      "yanchor": "bottom",
+      "x": 0.5,
+      "xanchor": "center"
+    },
+    "width": 700,
+    "height": 450
+  }
+}

test/jasmine/tests/pie_test.js

@@ -72,6 +72,20 @@ describe('Pie defaults', function() {
         var out = _supply({type: 'pie', values: [1, 2], textfont: {color: 'blue'}}, {font: {color: 'red'}});
         expect(out.insidetextfont.color).toBe('blue');
     });
+
+    it('should only coerce *automargin* if there are outside labels', function() {
+        var out = _supply({type: 'pie', labels: ['A', 'B'], values: [1, 2], automargin: true});
+        expect(out.automargin).toBe(true, 'dflt textposition');
+
+        var out2 = _supply({type: 'pie', labels: ['A', 'B'], values: [1, 2], automargin: true, textposition: 'inside'});
+        expect(out2.automargin).toBe(undefined, 'textposition inside');
+
+        var out3 = _supply({type: 'pie', labels: ['A', 'B'], values: [1, 2], automargin: true, textposition: 'none'});
+        expect(out3.automargin).toBe(undefined, 'textposition none');
+
+        var out4 = _supply({type: 'pie', labels: ['A', 'B'], values: [1, 2], automargin: true, textposition: 'outside'});
+        expect(out4.automargin).toBe(true, 'textposition outside');
+    });
 });
 
 describe('Pie traces', function() {
@@ -864,6 +878,82 @@ describe('Pie traces', function() {
         .then(done);
     });
 
+    it('should grow and shrink margins under *automargin:true*', function(done) {
+        var data = [{
+            type: 'pie',
+            values: [1, 2, 3, 4, 5],
+            labels: ['apples', 'oranges', 'blueberries', 'lemons', 'watermelon'],
+            textinfo: 'label+text+value+percent',
+            textposition: 'outside',
+            automargin: false
+        }];
+        var layout = {
+            width: 400, height: 400,
+            margin: {t: 0, b: 0, l: 0, r: 0},
+            showlegend: false
+        };
+
+        var previousSize;
+        function assertSize(msg, actual, exp) {
+            for(var k in exp) {
+                var parts = exp[k].split('|');
+                var op = parts[0];
+
+                var method = {
+                    '=': 'toBe',
+                    '~=': 'toBeWithin',
+                    grew: 'toBeGreaterThan',
+                    shrunk: 'toBeLessThan'
+                }[op];
+
+                var val = previousSize[k];
+                var msgk = msg + ' ' + k + (parts[1] ? ' |' + parts[1] : '');
+                var args = op === '~=' ? [val, 1.1, msgk] : [val, msgk, ''];
+
+                expect(actual[k])[method](args[0], args[1], args[2]);
+            }
+        }
+
+        function check(msg, restyleObj, exp) {
+            return function() {
+                return Plotly.restyle(gd, restyleObj).then(function() {
+                    var gs = Lib.extendDeep({}, gd._fullLayout._size);
+                    assertSize(msg, gs, exp);
+                    previousSize = gs;
+                });
+            };
+        }
+
+        Plotly.plot(gd, data, layout)
+        .then(function() {
+            var gs = gd._fullLayout._size;
+            previousSize = Lib.extendDeep({}, gs);
+        })
+        .then(check('automargin:true', {automargin: true}, {
+            t: 'grew', l: 'grew',
+            b: 'grew', r: 'grew'
+        }))
+        .then(check('smaller font size', {'outsidetextfont.size': 8}, {
+            t: 'shrunk', l: 'shrunk',
+            b: 'shrunk', r: 'shrunk'
+        }))
+        .then(check('arrayOk textposition', {
+            textposition: [['outside', 'outside', 'inside', 'inside', 'outside']],
+            'outsidetextfont.size': 12
+        }, {
+            t: '~=', l: 'shrunk',
+            b: 'grew', r: 'grew'
+        }))
+        .then(check('automargin:false', {automargin: false}, {
+            t: 'shrunk', l: 'shrunk',
+            b: 'shrunk', r: 'shrunk'
+        }))
+        .catch(failTest)
+        .then(done);
+    });
+});
+
+describe('Pie texttemplate:', function() {
     checkTextTemplate([{
         type: 'pie',
         values: [1, 5, 3, 2],