D3 Examples - Using Angular expressions for D3 accessors

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<!DOCTYPE html>
<html>
  <head>
    <title>Walking Dead Viewership</title>
  </head>
  <style>
    body, html{
      margin: 0;
      width: 900px;
      color: white;
      background-color: black;
      font-family: helvetica;
      margin: auto;
    }
    .scatter-container{
      width: 50%;
      float: left;
      height: 400px;
    }
    .detail{
      width: 50%;
      float: left;
      height: 400px;
    }
    scatter{
      width: 100%;
      height: 100%;
      display: block;
      z-index: 0;
      overflow: hidden;
      font-size: 10px;
    }
    scatter circle{
      opacity: 0.4;
      cursor: pointer;
      stroke-width: 2;
    }
    scatter circle:hover{
      stroke: white;
    }
    scatter text{
      fill: white;
      stroke: none;
    }
    scatter .x-axis path, scatter .y-axis path{
      stroke: none;
      fill: none;
    }
    scatter .x-axis line, scatter .y-axis line{
      stroke: rgba(255, 255, 255, 0.2);
    }
  </style>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.min.js"></script>
  <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
  <body ng-app="myApp" ng-controller="MainCtrl">
    <h1>Walking Dead Viewership</h1>
    <div class="scatter-container">
      <scatter
        data="episodes"
        accessor-x="d.air_date"
        accessor-y="d.us_viewers"
        selected-point="selectedEpisode"
        color="color(d.season)">
      </scatter>
    </div>
    <div class="detail">
      <h2>Episode: {{selectedEpisode.title}}</h2>
      <h3>season: {{selectedEpisode.season}}</h3>
      <h3>us viewers: {{selectedEpisode.us_viewers | number}}</h3>
    </div>
  </body>
  <script>
​
var app = angular.module('myApp', []);
​
app.controller('MainCtrl', function($scope, $window){
  $scope.color = d3.scale.category10();
  angular.element($window).on('resize', function(){ $scope.$apply(); });
  d3.csv('./episodes.csv', function(row){
    row.season = +row.season; // number
    row.air_date = new Date(row.air_date);
    row.us_viewers = +row.us_viewers * 1e6; // us viwers in millions
    return row;
  }, function(err, episodes){
    if(err){ throw err; }
    $scope.$apply(function(){
      // remove the few episodes that haven't air yet at time of writing.
      episodes = episodes.slice(0, -3);
      $scope.episodes = episodes;
      $scope.selectedEpisode = episodes[0];
    });
  });
});
​
app.directive('scatter', function(){
  function link(scope, el, attr){
    el = el[0];
    var w, h;
    var svg = d3.select(el).append('svg');
    var xAxisG = svg.append('g').attr('class', 'x-axis');
    var yAxisG = svg.append('g').attr('class', 'y-axis');
    var points = svg.append('g').attr('class', 'points').selectAll('g.point');
    var x = d3.scale.linear();
    var y = d3.scale.linear();
    var yFormat = d3.format('.2s');
    var timeFormat = d3.time.format('%m-%y');
    var xFormat = function(d){ return timeFormat(new Date(d)) };
    var xAxis = d3.svg.axis().scale(x).orient('bottom').tickFormat(xFormat);
    var yAxis = d3.svg.axis().scale(y).orient('left').tickFormat(yFormat);
    var m = 50;
​
    scope.$watch(function(){
      w = el.clientWidth;
      h = el.clientHeight;
      return w + h;
    }, resize);
​
    function resize(){
      svg.attr({width: w, height: h});
      x.range([m, w - m]);
      y.range([h - m, m]);
      xAxis.tickSize(-h + 2 * m);
      yAxis.tickSize(-w + 2 * m);
      xAxisG.attr('transform', 'translate(' + [0, y.range()[0] + 0.5] + ')');
      yAxisG.attr('transform', 'translate(' + [x.range()[0], 0] + ')');
      update();
    }
​
    scope.$watch('data', update);
​
    function update(){
      if(!scope.data){ return };
      var data = scope.data;
      var x_extent = d3.extent(data, function(d){ return scope.accessorX({d:d}) });
      x.domain(x_extent);
      var y_max = d3.max(data, function(d){ return scope.accessorY({d:d}) });
      y.domain([0, y_max]);
      points = points.data(data);
      points.exit().remove();
      var point = points.enter().append('g').attr('class', 'point');
      point.append('circle').attr('r', 5)
        .style('fill', function(d){ return scope.color({d:d}); })
        .on('mouseover', function(d){
          scope.$apply(function(){
            scope.selectedPoint = d;
          });
        })
​
      // update the position of all the points
      points.attr('transform', function(d){
        return 'translate(' + [x(scope.accessorX({d:d})), y(scope.accessorY({d:d}))] + ')';
      });
​
      xAxisG.call(xAxis);
      yAxisG.call(yAxis);
​
    };
  }
  return {
    link: link,
    restrict: 'E',
    scope: { data: '=', accessorX: '&', accessorY: '&', color: '&', selectedPoint: '=' }
  };
});
  </script>
</html>
    