使用angular resource载入中priorityData.json中间json数据，结合D3绘制甜甜圈图。执行index.html其结果见于图。：
priorityData.json中json数据例如以下：
{
"priority":{
"Blocker":12,
"Critical":18,
"Major":5,
"Minor":30,
"Trivial":24
}
}
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.16/angular-resource.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body ng-app="myApp" ng-controller=MainCtrl>
<li ng-repeat="(priority, val) in priorityData">
<span >{{priority}}</span>
<span >{{val}}</span>
</li>
<priority-graph data="priorityData"></priority-graph>
<script>
var myApp = angular.module('myApp', ['ngResource']);
//define app factory
myApp.factory('DataFac',function($resource){
return $resource('priorityData.json',{});
});
//define app controller
myApp.controller('MainCtrl',function($scope,DataFac){
DataFac.get(function(response){
$scope.priorityData = response.priority;
})
});
//define app directive
myApp.directive('priorityGraph', function(){
function link(scope, el, attr){
//set graph width,height and radius
var width=960,
height=500,
radius=Math.min(width,height)/2;
//set color range
var color=d3.scale.ordinal().range(["rgb(166,60,48)", "rgb(229,144,78)", " rgb(221,226,77)", "rgb(157,211,72)", "rgb(40,106,151)"]);
//set outer radius and inner radius for donut chart
var arc=d3.svg.arc()
.outerRadius(radius-80)
.innerRadius(radius-150);
//watch data change from json
scope.$watch('data', function(data){
if(!data){ return; }
//change json to two arrays for category and count
//count array
var countArr=[];
//category array
var categoryArr=[];
//total number of issues
var total=0;
for (key in data){
if(data.hasOwnProperty(key)){
categoryArr.push(key);
countArr.push(data[key]);
total+=data[key];
}
}
//get the graph parent element
el = el[0];
// remove the graph if already exist, in case of repeat
d3.select( el ).select( 'svg' ).remove();
var pie=d3.layout.pie()
.sort(null)
.value(function(d){return d});
var svg=d3.select(el).append("svg")
.attr("width",width)
.attr("height",height)
.append("g")
.attr("transform","translate("+width/2+","+height/2+")");
var g=svg.selectAll(".arc")
.data(pie(countArr))
.enter().append("g")
.attr("class","arc");
//paint the grah
g.append("path")
.attr("d",arc)
.style("fill",function(d,i){return color(i);});
//paint the text
g.append("text")
.attr("transform",function(d){return "translate("+arc.centroid(d)+")";})
.attr("dy",".35em")
.style("text-anchor","middle")
.text(function(d,i){return categoryArr[i]+":"+countArr[i]});
//paint total number in the middle of graph
g.append("text")
.attr("dy", ".35em")
.style("text-anchor", "middle")
.text(function(d) { return total+" tickets"; });
}, true);
}
return {
link: link,
restrict: 'E',
scope: { data: '=' }
};
});
</script>
</body>
</html>