Little thing for doing d3 the angular way - declaratively. "declarative data driven documents"! (I'm not the first to make something like this)

d4-piechart.html

<svg xmlns="http://www.w3.org/2000/svg" ng-attr-height="{{ radius() * 2 }}" ng-attr-height="{{ radius() * 2 }}" class="d4-piechart">
  <g d4-transform="translate(radius(), radius())">
      <g class="slice" ng-repeat="arc in arcs track by $index">
          <path d4-arc="arc"
              arc-inner-radius="innerRadius()"
              arc-outer-radius="radius()"
              arc-centroid="arc.centroid"
              ng-attr-fill="{{colorFromIndex($index)}}"
          ></path>
          <text text-anchor="middle" d4-transform="translate(arc.centroid)">
              {{label(arc.data)}}
          </text>
      </g>
  </g>
</svg>

d4-radialchart.html

<svg xmlns="http://www.w3.org/2000/svg" ng-attr-width="{{ barOuterRadius() * 2 }}" ng-attr-height="{{ barOuterRadius() * 2 }}" class="d4-piechart">
    <g d4-transform="translate(barOuterRadius(), barOuterRadius())">
        <g class="slice" ng-repeat="arc in arcs track by $index">
            <path d4-arc="arc"></path>
        </g>
        <g class="innerslice" ng-repeat="innerarc in innerArcs track by $index">
            <path d4-arc="innerarc"></path>
        </g>
    </g>
</svg>

declarative-d3.js

function d4directive(options) {
    "use strict";
    var prefix = function(string) {
        return options.shapeName + string.substr(0, 1).toUpperCase() + string.substr(1);
    }
    return function($parse) {
        return {
            restrict: "A",
            link: function($scope, $element, $attrs) {
                var shape = d3.svg[options.shapeName]();
                var theobj;

                var writeAttrs = [];
                angular.forEach(options.writeAttrs || [], function(name) {
                    var attr = $attrs[prefix(name)];
                    if (angular.isDefined(attr)) {
                        writeAttrs.push({
                            expression: $parse(attr),
                            name: name
                        });
                    }
                });

                function reshow() {
                    if (waitcount > 0) {
                        return;
                    }
                    angular.forEach(writeAttrs, function(writeAttr) {
                        writeAttr.expression.assign($scope, shape[writeAttr.name](theobj));
                    });
                    $element.attr("d", shape(theobj));
                }
                var waitcount = 1;
                var mainwait = true;
                $scope.$watch($attrs[options.directiveName], function(obj) {
                    if (!angular.isDefined(obj)) {
                        return;
                    }
                    if (mainwait) {
                        mainwait = false;
                        waitcount -= 1;
                    }
                    theobj = obj;
                    reshow();
                })
                angular.forEach(options.attrs, function(name) {
                    var attrName = prefix(name);
                    if (!angular.isDefined($attrs[attrName])) {
                        return;
                    }
                    var mywait = true;
                    waitcount += 1;
                    $scope.$watch($attrs[attrName], function(value) {
                        if (!angular.isDefined(value)) {
                            return;
                        }
                        if (mywait) {
                            mywait = false;
                            waitcount -= 1;
                        }
                        shape[name](value);
                        reshow();
                    });
                });
            }
        };
    };
}

// d3: data driven documents
// d4: declarative data driven documents
angular.module("d4", [])
    .factory("d4ParseAccessor", function($parse) {
        return function(string, scope, defaultFunc) {
            if (!angular.isDefined(string)) {
                return defaultFunc;
            } else {
                var expression = $parse(string);
                return function(x, index) {
                    return expression(scope, {x: x});
                }
            }
        }
    })
    .directive("d4ChartPie", function(d4ParseAccessor) {
        return {
            restrict: "E",
            templateUrl: "/partials/d4-piechart.html",
            replace: true,
            scope: {
                radius: "&",
                innerRadius: "&",
                data: "="
            },
            link: function($scope, $element, $attrs) {
                $scope.colorFromIndex = d3.scale.category20c();

                $scope.value = d4ParseAccessor($attrs.valueAccessor,
                        $scope.$parent, function(x) { return x.value; });
                $scope.label = d4ParseAccessor($attrs.labelAccessor,
                        $scope.$parent, function(x) { return x.label; });

                $scope.$watch("data", function(data) {
                    if (!angular.isDefined(data)) {
                        return;
                    }
                    // https://github.com/mbostock/d3/wiki/Pie-Layout
                    // generates array of objects to be fed to d3.arc
                    var arcObjectCreator = d3.layout.pie()
                        .value($scope.value);

                    // takes: [{..., value: }, ...]
                    // returns: [{data: ..., innerRadius, outerRadius, startAngle, endAngle}, ...]
                    $scope.arcs = arcObjectCreator(data);
                }, true);
            }
        };
    })
    .directive("d4ChartRadial", function(d4ParseAccessor) {
        return {
            restrict: "E",
            templateUrl: "/partials/d4-radialchart.html",
            scope: {
                baselineInnerRadius: "&",
                baselineOuterRadius: "&",
                barInnerRadius: "&",
                barOuterRadius: "&",
                domain: "&",
                data: "="
            },
            replace: true,
            link: function($scope, $element, $attrs) {
                $scope.colorFromIndex = d3.scale.category20c();

                var accessor = d4ParseAccessor($attrs.valueAccessor,
                    $scope.$parent, function(x) { return x.value; });

                var recalculate = function() {
                    var data = $scope.data;
                    var outer = $scope.barOuterRadius();
                    var inner = $scope.barInnerRadius();
                    var domain = $scope.domain();
                    if (!angular.isDefined($scope.data)
                            || !angular.isDefined(inner)
                            || !angular.isDefined(outer)) {
                        return;
                    }
                    if (domain === "extent") {
                        domain = d3.extent(data, accessor);
                    }
                    if (domain[0] === "min") {
                        domain[0] = d3.min(data, accessor);
                    }
                    if (domain[1] === "max") {
                        domain[1] = d3.max(data, accessor);
                    }
                    var scale = d3.scale.linear()
                            .domain(domain)
                            .range([inner, outer]);
                    var curvescale = d3.scale.linear()
                            .domain([0, data.length])
                            .range([0, Math.PI * 2]);

                    var innerArcCount = 8;
                    var innerArcScale = curvescale.copy()
                            .domain([0, innerArcCount]);
                    $scope.innerArcs = [];
                    for (var index=0; index<innerArcCount; index++) {
                        $scope.innerArcs.push({
                            innerRadius: $scope.baselineInnerRadius(),
                            outerRadius: $scope.baselineOuterRadius(),
                            startAngle: innerArcScale(index),
                            endAngle: innerArcScale(index+1)
                        });
                    }

                    $scope.arcs = [];
                    angular.forEach(data, function(item, index) {
                        item = accessor(item);
                        $scope.arcs.push({
                            outerRadius: scale(item),
                            innerRadius: inner,
                            startAngle: curvescale(index),
                            endAngle: curvescale(index+1)
                        })
                    });
                }
                $scope.$watch("data", recalculate, true);
                $scope.$watch("barInnerRadius()", recalculate);
                $scope.$watch("barOuterRadius()", recalculate);
                $scope.$watch("baselineInnerRadius()", recalculate);
                $scope.$watch("baselineOuterRadius()", recalculate);
            }
        };
    })
    .directive("d4Transform", function($parse) {
        return {
            restrict: "A",
            link: function($scope, $element, $attrs) {
                var expression = $parse($attrs.d4Transform);
                var functions = {
                    translate: function(x, y) {
                        if (angular.isDefined(y)) {
                            return "translate(" + x + "," + y + ")";
                        } else {
                            return "translate(" + x + ")";
                        }
                    }
                }
                $scope.$watch(function() {
                    return expression($scope, functions);
                }, function(value) {
                    if (!angular.isDefined(value)) {
                        return;
                    }
                    $element.attr("transform", value);
                });
            }
        }
    })
    .directive("d4Arc", d4directive({
        writeAttrs: ["centroid"],
        shapeName: "arc",
        directiveName: "d4Arc",
        attrs: ["innerRadius", "outerRadius", "startAngle", "endAngle"]
    }));

LICENSE-MIT.txt

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.