Fix empty pie chart - #952

.jshintrc

@@ -22,7 +22,8 @@
         "describe": false,
         "beforeEach": false,
         "it": false,
-        "expect": false 
+        "expect": false,
+        "d3": false
     }
 
 }

c3.js

@@ -4568,6 +4568,9 @@
             }
             index++;
         });
+        if (isNaN(d.startAngle)) {
+            d.startAngle = 0;
+        }
         if (isNaN(d.endAngle)) {
             d.endAngle = d.startAngle;
         }
@@ -4840,6 +4843,9 @@
                 //                        endAngle: Math.PI*2,
                 //                    };
                 //                }
+                if (isNaN(this._current.startAngle)) {
+                    this._current.startAngle = 0;
+                }
                 if (isNaN(this._current.endAngle)) {
                     this._current.endAngle = this._current.startAngle;
                 }

spec/arc-spec.js

-
-describe('c3 chart axis', function () {
+describe('c3 chart arc', function () {
     'use strict';
 
-    var chart, d3, args;
+    var chart, args;
 
     beforeEach(function (done) {
-        if (typeof chart === 'undefined') {
-            window.initDom();
-        }
-        chart = window.c3.generate(args);
-        d3 = chart.internal.d3;
-        chart.internal.d3.select('.jasmine_html-reporter')
-            .style('position', 'absolute')
-            .style('right', 0);
-
-        window.setTimeout(function () {
-            done();
-        }, 50);
+        chart = window.initChart(chart, args, done);
     });
 
     describe('show pie chart', function () {
 
-        args = {
-            data: {
-                columns: [
-                    ['data1', 30],
-                    ['data2', 150],
-                    ['data3', 120]
-                ],
-                type: 'pie'
-            }
-        };
+        it('should update args to have pie chart', function () {
+            args = {
+                data: {
+                    columns: [
+                        ['data1', 30],
+                        ['data2', 150],
+                        ['data3', 120]
+                    ],
+                    type: 'pie'
+                }
+            };
+            expect(true).toBeTruthy();
+        });
 
         it('should have correct classes', function () {
             var chartArc = d3.select('.c3-chart-arcs'),
@@ -69,6 +60,38 @@ describe('c3 chart axis', function () {
             expect(d3.select('.c3-arc-black').attr('d')).toMatch(/M-124\..+,-171\..+A211\..+,211\..+ 0 0,1 -3\..+,-211\..+L0,0Z/);
         });
 
+        it('should update args to have empty pie chart', function () {
+            args = {
+                data: {
+                    columns: [
+                        ['data1', null],
+                        ['data2', null],
+                        ['data3', null]
+                    ],
+                    type: 'pie'
+                }
+            };
+            expect(true).toBeTruthy();
+        });
+
+        it('should have correct d attribute', function () {
+            var chartArc = d3.select('.c3-chart-arcs'),
+            arcs = {
+                data1: chartArc.select('.c3-chart-arc.c3-target.c3-target-data1')
+                    .select('g.c3-shapes.c3-shapes-data1.c3-arcs.c3-arcs-data1')
+                    .select('path.c3-shape.c3-shape.c3-arc.c3-arc-data1'),
+                data2: chartArc.select('.c3-chart-arc.c3-target.c3-target-data2')
+                    .select('g.c3-shapes.c3-shapes-data2.c3-arcs.c3-arcs-data2')
+                    .select('path.c3-shape.c3-shape.c3-arc.c3-arc-data2'),
+                data3: chartArc.select('.c3-chart-arc.c3-target.c3-target-data3')
+                    .select('g.c3-shapes.c3-shapes-data3.c3-arcs.c3-arcs-data3')
+                    .select('path.c3-shape.c3-shape.c3-arc.c3-arc-data3')
+            };
+            expect(arcs.data1.attr('d').indexOf('NaN')).toBe(-1);
+            expect(arcs.data2.attr('d').indexOf('NaN')).toBe(-1);
+            expect(arcs.data3.attr('d').indexOf('NaN')).toBe(-1);
+        });
+
     });
 
 });

spec/c3-helper.js

@@ -29,10 +29,13 @@ function initChart(chart, args, done) {
     if (typeof chart === 'undefined') {
         window.initDom();
     }
-    chart = window.c3.generate(args);
-    chart.internal.d3.select('.jasmine_html-reporter')
-        .style('position', 'absolute')
-        .style('right', 0);
+    if (args) {
+        chart = window.c3.generate(args);
+        window.d3 = chart.internal.d3;
+        window.d3.select('.jasmine_html-reporter')
+            .style('position', 'absolute')
+            .style('right', 0);
+    }
 
     window.setTimeout(function () {
         done();

src/arc.js

@@ -36,6 +36,9 @@ c3_chart_internal_fn.updateAngle = function (d) {
         }
         index++;
     });
+    if (isNaN(d.startAngle)) {
+        d.startAngle = 0;
+    }
     if (isNaN(d.endAngle)) {
         d.endAngle = d.startAngle;
     }
@@ -308,6 +311,9 @@ c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransf
             //                        endAngle: Math.PI*2,
             //                    };
             //                }
+            if (isNaN(this._current.startAngle)) {
+                this._current.startAngle = 0;
+            }
             if (isNaN(this._current.endAngle)) {
                 this._current.endAngle = this._current.startAngle;
             }