more sunburst rotation

src/traces/pie/helpers.js

@@ -40,3 +40,7 @@ exports.castOption = function castOption(item, indices) {
     if(Array.isArray(item)) return exports.getFirstFilled(item, indices);
     else if(item) return item;
 };
+
+exports.getRotationAngle = function(rotation) {
+    return (rotation === 'auto' ? 0 : rotation) * Math.PI / 180;
+};

src/traces/pie/plot.js

@@ -1045,7 +1045,7 @@ function setCoords(cd) {
     var cd0 = cd[0];
     var r = cd0.r;
     var trace = cd0.trace;
-    var currentAngle = trace.rotation * Math.PI / 180;
+    var currentAngle = helpers.getRotationAngle(trace.rotation);
     var angleFactor = 2 * Math.PI / cd0.vTotal;
     var firstPt = 'px0';
     var lastPt = 'px1';

src/traces/sunburst/plot.js

@@ -18,6 +18,7 @@ var uniformText = require('../bar/uniform_text');
 var recordMinTextSize = uniformText.recordMinTextSize;
 var clearMinTextSize = uniformText.clearMinTextSize;
 var piePlot = require('../pie/plot');
+var getRotationAngle = require('../pie/helpers').getRotationAngle;
 var computeTransform = piePlot.computeTransform;
 var transformInsideText = piePlot.transformInsideText;
 var styleOne = require('./style').styleOne;
@@ -150,11 +151,11 @@ function plotOne(gd, cd, element, transitionOpts) {
     // filter out slices that won't show up on graph
     sliceData = sliceData.filter(function(pt) { return pt.y1 <= cutoff; });
 
-    if(trace.rotation && trace.rotation !== 'auto') {
-        var extraAngle = trace.rotation * Math.PI / 180;
+    var baseX = getRotationAngle(trace.rotation);
+    if(baseX) {
         sliceData.forEach(function(pt) {
-            pt.x0 += extraAngle;
-            pt.x1 += extraAngle;
+            pt.x0 += baseX;
+            pt.x1 += baseX;
         });
     }
 
@@ -310,7 +311,7 @@ function plotOne(gd, cd, element, transitionOpts) {
         var next;
 
         if(entryPrev) {
-            var a = pt.x1 > entryPrev.x1 ? 2 * Math.PI : 0;
+            var a = (pt.x1 > entryPrev.x1 ? 2 * Math.PI : 0) + baseX;
             // if pt to remove:
             // - if 'below' where the root-node used to be: shrink it radially inward
             // - otherwise, collapse it clockwise or counterclockwise which ever is shortest to theta=0
@@ -360,7 +361,7 @@ function plotOne(gd, cd, element, transitionOpts) {
                         // if new branch, twist it in clockwise or
                         // counterclockwise which ever is shorter to
                         // its final angle
-                        var a = pt.x1 > nextX1ofPrevEntry ? 2 * Math.PI : 0;
+                        var a = (pt.x1 > nextX1ofPrevEntry ? 2 * Math.PI : 0) + baseX;
                         prev = {x0: a, x1: a};
                     } else {
                         // if new leaf (when maxdepth is set),
@@ -375,7 +376,7 @@ function plotOne(gd, cd, element, transitionOpts) {
                 }
             } else {
                 // start sector of new traces from theta=0
-                prev = {x0: 0, x1: 0};
+                prev = {x0: baseX, x1: baseX};
             }
         }
 
@@ -418,11 +419,11 @@ function plotOne(gd, cd, element, transitionOpts) {
                     }
                 } else {
                     // if new root-node
-                    prev.x0 = prev.x1 = 0;
+                    prev.x0 = prev.x1 = baseX;
                 }
             } else {
                 // on new traces
-                prev.x0 = prev.x1 = 0;
+                prev.x0 = prev.x1 = baseX;
             }
         }
 

test/image/mocks/treemap_sunburst_basic.json

@@ -194,6 +194,7 @@
         },
         {
             "type": "sunburst",
+            "rotation": 180,
             "level": "",
             "labels": [
                 "A1",
@@ -295,6 +296,7 @@
         },
         {
             "type": "sunburst",
+            "rotation": 90,
             "level": "",
             "labels": [
                 "C1",