block by emeeks 0cdbbba6db4d5ca994b5

Ch. 5, Fig. 16 - D3.js in Action

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This is the code for Chapter 5, Figure 16 from D3.js in Action demonstrating d3.behavior.zoom(). Click and drag the canvas to see more of the dendrogram.

index.html

<html>
<head>
  <title>D3 in Action Chapter 5 - Example 7</title>
  <meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<style>
  svg {
    height: 500px;
    width: 500px;
    border: 1px solid gray;
  }
  
</style>
<body>

<div id="viz">
  <svg>
  </svg>
</div>
<div id="controls" />
</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);

      packableTweets = {id: "root", values: nestedTweets}

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

      treeChart = d3.layout.tree();
      treeChart.size([500,500])
      .children(function(d) {return d.values});
      
     var linkGenerator = d3.svg.diagonal();
     
     linkGenerator
     .projection(function (d) {return [d.y, d.x]})

      d3.select("svg")
      .append("g")
      .attr("class", "treeG")
      .selectAll("g")
      .data(treeChart(packableTweets))
      .enter()
      .append("g")
      .attr("class", "node")
      .attr("transform", function(d) {return "translate(" +d.y+","+d.x+")"});
      
      d3.selectAll("g.node")
      .append("circle")
      .attr("r", 10)
      .style("fill", function(d) {return depthScale(d.depth)})
      .style("stroke", "white")
      .style("stroke-width", "2px");
      
      d3.selectAll("g.node")
      .append("text")
      .text(function(d) {return d.id || d.key || d.content})
      
      d3.select("g.treeG").selectAll("path")
      .data(treeChart.links(treeChart(packableTweets)))
      .enter().insert("path","g")
      .attr("d", linkGenerator)
      .style("fill", "none")
      .style("stroke", "black")
      .style("stroke-width", "2px");
      
      treeZoom = d3.behavior.zoom();
      treeZoom.on("zoom", zoomed);
      d3.select("svg").call(treeZoom)
      
      function zoomed() {
        var zoomTranslate = treeZoom.translate();
        d3.select("g.treeG").attr("transform", "translate("+zoomTranslate[0]+","+zoomTranslate[1]+")")
      }
    }
</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"]}
]
}