block by emeeks becd7b34d93b2d80d828

Pie Transition Ch. 5 - D3.js in Action

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This is the code for Chapter 5, Figure 6 from D3.js in Action demonstrating how to make a donut chart using d3.layout.pie().

forked from emeeks‘s block: Ch. 5, Fig. 6 - D3.js in Action

index.html

<html>
<head>
  <title>D3 in Action Chapter 5 - Example 3</title>
  <meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.16/d3.min.js" type="text/JavaScript"></script>
</head>
<style>
  svg {
    height: 500px;
    width: 500px;
    border: 1px solid gray;
  }
  
</style>
<body>

<div id="viz">
  <svg>
  </svg>
</div>
</body>
  <footer>
    
<script>
    d3.json("tweets.json",function(error,data) {dataViz(data.tweets)});
    
    function dataViz(incData) {
      nestedTweets = d3.nest()
      .key(function (el) {return el.user})
      .entries(incData);

    var colorScale = d3.scale.category10([0,1,2,3]);

      nestedTweets.forEach(function (el) {
        el.numTweets = el.values.length
        el.numFavorites = d3.sum(el.values, function (d) {return d.favorites.length});
        el.numRetweets = d3.sum(el.values, function (d) {return d.retweets.length});
      })
      
      pieChart = d3.layout.pie().sort(null);
      pieChart.value(function(d) {return d.numRetweets});
      newArc = d3.svg.arc();
      newArc.outerRadius(100).innerRadius(20);

      d3.select("svg")
      .append("g")
      .attr("transform","translate(250,250)")
      .selectAll("path")
      .data(pieChart(nestedTweets), function(d) {return d.data.key})
      .enter()
      .append("path")
      .attr("d", newArc)
      .style("fill", function(d, i) {return colorScale(i)})
      .style("opacity", .5)
      .style("stroke", "black")
      .style("stroke-width", "2px")
      .each(function(d) { this._current = d; });
      
      pieChartFavs = d3.layout.pie().sort(null);
      pieChartFavs.value(function(d) {return d.numFavorites});
      
      d3.selectAll("path")
      .data(pieChartFavs(nestedTweets), function(d) {return d.data.key})
      .transition()
      .duration(2000)
      .attrTween("d", arcTween)
      
      function arcTween(a) {
        var i = d3.interpolate(this._current, a);
        this._current = i(0);
      return function(t) {
      return newArc(i(t));
      };
    }
    
    }

</script>
  </footer>

</html>

tweets.json

{
"tweets": [
{"user": "Al", "content": "I really love seafood.", "timestamp": " Mon Dec 23 2013 21:30 GMT-0800 (PST)", "retweets": ["Raj","Pris","Roy"], "favorites": ["Sam"]},
{"user": "Al", "content": "I take that back, this doesn't taste so good.", "timestamp": "Mon Dec 23 2013 21:55 GMT-0800 (PST)", "retweets": ["Roy"], "favorites": []},
{"user": "Al", "content": "From now on, I'm only eating cheese sandwiches.", "timestamp": "Mon Dec 23 2013 22:22 GMT-0800 (PST)", "retweets": [], "favorites": ["Roy","Sam"]},
{"user": "Roy", "content": "Great workout!", "timestamp": " Mon Dec 23 2013 7:20 GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Spectacular oatmeal!", "timestamp": " Mon Dec 23 2013 7:23 GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Amazing traffic!", "timestamp": " Mon Dec 23 2013 7:47  GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Just got a ticket for texting and driving!", "timestamp": " Mon Dec 23 2013 8:05 GMT-0800 (PST)", "retweets": [], "favorites": ["Sam", "Sally", "Pris"]},
{"user": "Pris", "content": "Going to have some boiled eggs.", "timestamp": " Mon Dec 23 2013 18:23 GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]},
{"user": "Pris", "content": "Maybe practice some gymnastics.", "timestamp": " Mon Dec 23 2013 19:47  GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]},
{"user": "Sam", "content": "@Roy Let's get lunch", "timestamp": " Mon Dec 23 2013 11:05 GMT-0800 (PST)", "retweets": ["Pris"], "favorites": ["Sally", "Pris"]}
]
}